MHFD Homepage

 

https://f2p2.udfcd.org/images/f2p2_heading.gif
2026 Flood Season Summary

Meteorological support services provided by Skyview Weather.

Select desired 'Date' to see corresponding 24-hour rainfall map ending at 7AM the following day.

 

 

 

 

 

 

 

 

> 0.6" RADAR ESTIMATE OR 0.5" GAUGED IN FORECAST AREA

Event

Date

Max ALERT

Max CoCoRaHS

QPE STP

ALERT

Alarms

ALERT

Rain

Alarms

Notes

ADAM

ARAP

AURA

BLDR

BROM

DENV

DOUG

JEFF

1
0.67"
0.70"
>0.75"

HPO issued at 0901 with MOD Message Potential for Douglas/Jefferson Counties; LOW for the rest of the District.  The season's first storms initiated along the higher terrain, pulsing between 1400 and 1600.  A gust front moving eastward collided with juicer air east of Denver to produce a line of storms from Pena Blvd south along I-225.  These storms rapidly increased in strength but generally rained themselves out as quickly, impacting Adams, Arapahoe and Denver Counties and the City of Aurora.  Another round of storms was initated just after 1900, affecting Jefferson, Denver and portions of Arapahoe County.
X
X



X


2
2.83"
1.11"
>1.75"
Map
HPO issued at 0908 with a LOW Message potential for the entire District.  M1 issued at 1200, effecive until 2100.  Pulsing gusts colliding with persistent south to southeasterly flow aloft caused rapid development of storm activity over the downtown Denver area, bringing large hail and moderate rain.   By 1400 a storm stalled over east Denver and northern Aurora resulted in a Flash Flood Warning.  Storms in Douglas County also developed but were limited by atmospheric conditions.
X
X
X


X
X

3
0.31"
0.37"
>.25"

HPO issued at 0914 with a LOW Message potential for the entire District.  M1 issued at 1349, effective until 2200.  Elevated moisture at the surface remained, but lower daytime temperatures resulted in a capped environment over the District.  Some storm initation in the higher elevations was evident by midday, with storms pulsing towards the District.  By 1300, storms moved into the Boulder area with moderate rainfall and the potential for heavy rainfall.  However storms struggled to take hold over the District as temperatuers stayed just below the convective temperature for the day.








4
1.06"
0.81"
>1.00"
Map HPO issued at 0936 with a LOW Message potential for the entire District.  M1 issued at 1510, effective until 2200.  Similar to previous days, storms initated along the higher terrain west and slowly moved onto the plains during the early afternoon.  Storms remained relatively weak until they moved into more buoyant air to the east located just north and just south of the District.  The northern cell brought rainfal over 0.50" north of Brighton.  At the same time, a cluster storms developed southeast of the District in Douglas/Ebert County.  These cells built into Castle Rock, resulting in a Flood Advisory for that area.  The NWS issued a Severe Thunderstorm Warning for portions of northeastern Douglas County/southwestern Arapahoe County.






X

5
0.79"
0.88"
>0.75"
Map HPO issued at 0900 with LOW Message potential for the entire District.  M1 issued at 1349, effective until 2000.  Southeasterly flow at the surface brought a surge of moisture that combined with a cold front to create storms initating along the higher elevations by noon.  The storms ramped up in Jefferson and Douglas Counties, bringing large hail and severe wind gusts but modest to moderate rainfall within the District.  A storm in Douglas County prompted a Flood Advisory, and a Tornado Warning was issued for a storm on the eastern side of the District near DIA.
X





X

6
0.43"
0.01"
>0.50"

HPO issued at 0909 with MOD
potential.  M1 isssued at 2029 for the entire District effective until 0100 6/24/2026.  Storms developed late, with large hail, strong winds and frequent cloud-to-ground lightening along the Palmer divide.  Cells north/northeast of the District and south along the Palmer Divide threatened heavy rainfall, prompting the M1, but storms struggled to develop over the District.








7
3.50"
3.22"
>1.00"
Map HPO issued at 0934 with a MOD Message potential for the entire District.  M1 issued at 2107 for the entire District, effective until 0100 on 6/25/2026.  A peculiar setup restulted in potential for heavy rainfall not only during the typical afternoon and early evening, but well into the overnight hours.  Early storm development along the Palmer Divide resulted in storms heading east, but well south of the District, but a Tornado Watch included eastern portions of the District 1552 to 2300.  By 2100, thunderstorms developed and anchored for several hours over the Evergreen area, producing over 3" of rainfall and causing rockslides that closed Highway 6 into 6/25/2026.  This storm and others that encompassed the entirety of Jefferson County included large hail and gusty winds.  Heavy rainfall resulted in multiple alarms across the District, with some areas receiving over 1" in under 30 minutes.  Atypically, strong to severe thunderstorms impacted areas from Evergreen to DIA in the late evening hours.  Across the District most counties received more than 1" of rainfall between 2100 and 2400, with pockets of rainfall from 2400 to 0200.  A morning round of showers from 0500 to 0600 impacted Ponderosa Park in northeastern Douglas County, clearing at daybreak.
X
X
X
X
X
X
X
X
8
1.54"
1.15"
>1.00"
Map HPO issued at 0830 with a MOD Message potential for Boulder and Broomfield Counties, and HIGH  potential otherwise.  M1 issued at 2006 for the entire District, effective until 2300.  Lower temperatures from the previous day's lingering showers held off storm development until the late evening, similar to the previous night.  A gust front from a severe storm to the north in Larimer County moved south, creating a few weaker storms over Boulder with a much stroner cell initially firing over nearly the same location as the previous night, over Evergreen.  This storm quickly developed and just after 2000 resulted in an inch of rainfall and a Flood Advisory.  Additional storm developed into the Denver Metro, with hail, gusty winds and cloud-to-ground lightning.  In Jefferson and Denver Counties, .5 to 1" of rainfall was common before storms lost strength and moved eastward before 2400.

X
X
X


X
X
9
0.67"
0.85"
>0.75"

HPO issued at 0900 with a LOW Message potential for the entire District.  M1 issued at 1456 for the entire District, effective until 2100.  A significant gust from the east increased surface level moisture, allowing weak higher elevation storms to form in the northern half of the Distict between 1500 and 1800.  Storms over Boulder and Broomfield produced .10" - .40" of rain.  As storms progressed eastward into Adams County, they produced much stonger rainfall over the Brighton area.  An LIF was issued at 16:06 for Adams County.
X







10
1.06"
0.46"
>1.00"

HPO issued at 0916 with a LOW Message potential for the entire District.  M1 issued at 1915 for the entire District, effective until 2300.  Convective cells struggled when moving off the higher elevations of Jefferson County due to a lack of upper-level support and south to north 5010 mph storm motion.  Finally a single storm near Bailey pushed a gust front into the District around 1800-1900, with storms slowly gaining strength and meandering north through the District; with Messages issued around 1915 and the one LIF of the day for rainfall between 0.30: and 0.90" in the northernmost part of the District.



X




11
0.94"
1.33"
>3.00"
Map HPO issued at 0941 with a HIGH Message potential for the entire District.  M1 issued at 1231 for the entire District, effective until 2200.  An abundance of surface level moinsture allowed multiple storms to produce Message level rainfall.  Very minimal steering winds produced an early slow moving storm with potential to cause Flash Flooding (Warning issued 1510).  Rainfall impacted first Douglas County, then Auruora/Arapaho/Adams Counties and DIA, and later a later cell headed towards Jeffco/Broomfield, but storms ended up weakening due to cooler temperatures across the board.X
X
X


X
X
X
12
0.91"
0.89"
>1.50"

HPO issued at 0901 with HIGH Message potential for the entire District.  M1 issued at 1232 effective until 2200.  Cloud cover suppressed storm potential until just after noon, when the first thunderstorm initiated in the Evergreen area.  The cell produced rainfall between 0.50" and 0.75", resulting in a Flood Advisory due to antecedent conditions.  The storm was held in place by capped conditions over the Denver Metro area, resulting in minor activity inside the District.  At sunset a line of strong storms meandered southward from Larimer Couty and into northern portions of the District, with heavy rain between 2000 and 2100 in Boulder County just clipping the District.  Addiional strong storm development affected portions of Jefferson County from just south of Morrison and into northern Douglas County.  A thunderstorm producing 0.75" to 1.25" of rainfall resulted in another NWS Flood Advisory.






X
X
13
1.22"
1.26"
>1.25"
Map HPO was issued at 0900 with LOW Message potential for the entire District.  M1 issued at 1551, effective until 2200.  A storm in Jefferson County slowly overtook the majority of the District.  Around 1500 a thunderstorm initiated in Boulder County and settled into Jefferson County, producing lightning, gusty winds, hail and heavy rainfall 0.50" to 1.25".  A Severe Thunderstorm Warning for those Counties was in effect 1705-1745.  The NWS issued to areal Flood Advisories:  for Jefferson at 1804 and for Douglas at 1900.  Rainfall in the Distict waxed and waned while the storm moved slowly over the western portion of the District, resulting in LIFs.

X

X


X
X
14
0.31"
0.87"
>1.00"

HPO issued at 0910 with LOW Message potential for teh Plains and MOD potential for the Foothills above 6500 ft.  M1 issued at 1407, effective until 2200 for the entire District.  Although storms struggled to take hold, likely due to hot temperatures and sufficient mixing, a strong storm quickly formed in northwestern Douglas County, leading to Messages issued by midafternoon.  This storm strengthened but moved east and out of the District.






X

15
0.87"
1.21"
>0.75"

HPO issued at 0943 with a HIGH Message potential for Douglas County and a MOD Message potential elsewhere in the District.  M1 issued at 1453 for the entire District, effective until 2200.  Multiple storms formed at elevation between 1400 and 1500, but relatively weak steering winds and their pulse-like nature, which provided cooling shade across the District, sapped their energy.  Storms dissipated as they moved between 1500 and 1700.  A stubborn storm in western Jefferson County remained largely in place, causing the NWS to issued an Areal Flood Advisory just outside the District at 1630, but this storm also diminished before entereing the District.







X
16
1.85"
1.76"
>2.50"
Map HPO issued at 0936 with a HIGH Message potential for the entire District.  M1 issued at 1157 for the entire District, effective until 2200.  Storms that weakened as they moved off the higher elevations helped suppress temperatures, but gust fronts created a convective cell over Castle Rock that moved northesast around 1400.  An LIF was issued at 1422 as this storm moved through northern Douglas County, and another at 1453 as it entered Arapahoe County.   Other areas remained too cool to support convective cells and experienced sub-LIF level rainfall.

X
X
X


X
X
17
1.89"
3.35"
>2.00"
Map HPO issued at 0956 with a HIGH Message potential for the entire District.  M1 issued at 1210 for the entire District, effective until 2100.  The NWS issued a Flood Watch for portions of eastern Douglas County within the District, as storms strengthened enough to produce between 0.30" and 0.90" in 10-30 minutes.  The first LIF was issued at 1416, but the storm expanded into a large storm system providing heavy rain due to training, and multiple areas in Douglas County saw rainfall of 1 to 2 inches per hour.  The NWS issued a Flash Flood Warning at 1506.  As the storm moved northeast, heavy rainfall impacted Arapahoe County including the City of Aurora.  Another storm to the north impacted Adams County including DIA with rainfall up to .50" in 10-30 minutes.
X
X
X


X
X

18
0.59"
0.76"
>1.25"
Map HPO issued at 0932 with a  LOW chance for Messages across the District.  M1 issued at 1844 effecive until 2100.  A gust front developed from strong storms along the Palmer Divide and slowly meandered into the southern portion of the District around 1800.  Relatively weak storms along the higher terrain west of the District generated another gust front that moved east from storms in Jefferson County and interacted with the earlier, slow-movign just from, rapidly strengthening over downtown Denver and resulting in the Message.  Moderate to isolated heavy rain in the 0.30" to 0.70" range, and hail up to 0.5" in diameter, were produced as this storm slowly moved through Denver and into Arapahoe County.






X
X
19
0.94"
1.67"
>0.75"

HPO issued at 0900 with a LOW Message potential for the entire District.  M1 issued at 1235 for the entire District, effective until 2100.  A round of storms formed west of Jefferson County just before noon, with a single strong cell producing locally heavy rainfall just outside the District prompting Messages to be issued just after 1230.  The storm collapsed as it moved further into the District.  A later round of storms in the evening prompted extension of Messages until 2300, with a single gage alert at Cold Spring Gulch with 0.48" in 10 minutes.






X
X
20
1.56"
2.17"
>2.00"
Map HPO issued at 0901 with HIGH Message potential for the Plains and MOD potential along the Foothills.  M1 issued at 1100 for the entire District, effective until 2200.  Cooler morning temperatures suppressed storm activity until a stronger cell took hold in Jefferson County, over Evergreen, bringing over an inch of rain.  This storm moved into the District 1400 to 1500, dropping .25" to .75" in 10-20 minutes over Denver but encountering more unstable air and increasing rainfall to the 0.50" to 1.00" in 10-20 minutes as it traversed Aurora, resulting in a Flash Flood Warning from southeast Denver to Aurora from 1623 to 1915, with hail up to 1.0", gusty winds and cloud-to-ground lightning.

X
X


X
X
X
21
2.76"
1.86"
>2.00"
Map HPO issued at 0900 with a HIGH Message potential for the Plains and a MOD potential for the Foothills.  M1 issued at 1105 for the entire District, effective until 2200.  Due to very elevated moisture and good heating, the potential for showers/thunder- storms was high and a Flood Watch was issued by the NWS effective 1400 to 2200.  The strongest storms were during peak afternoon heating, with 0.50" to 1.00" in 10-20 minutes occuring in isolated pockets and causing some flooding into the evening hours.  The NWS issued a Flash Flood Warning for the south Denver Metro Area and a short time later another for northeastern portions of the District in Adams County.
X
X
X
X

X
X
X
22
2.20"
3.29"
>1.75"
Map HPO was issued at 0906 with a HIGH Message potential for he entire District.  m1 issued at 1116 for the entire District, effective until 2200.  Some of the most significant rainfall of the season was set up by abundant moisture and heating.  The NWS issued a Flood Watch 1400 to 2200, which was cancelled by 1930.  A Severe Thunderstorm Watch for Arapahoe & Douglas Counties was in effect from 1412 to 2100.  Point rainfall amounts for a storm originating over Evergreen were limited by hail, but 0.50" to 1.00" in 10-20 minutes occurred from Evergreen through Dakota Ridge and into southwestern Denver County.  Additional thunderstorms developed over Douglas County and combined in the south Denver/Aurora area, strengthening as it hit the I-25 corridor.  Several alarms were triggered by storms between 1400-1500.  Flooding was more widespread than the previous day in the central District area. 
X
X
X
X

X
X
X
23
0.43"
1.01"
>1.00"

HPO issued at 0900 with a MOD Message potential for the entire Distict, effective until 2100.  The NWS issued another Severe Thunderstorm Watch.  Storm initiated along the Palmer Divide between 1300 and 1400, producing moderate to heavy rainfall anchored over Douglas/Elbert Counties but limited impact to the District.  At 1600, a moderate thrunderstorm developed right over Denver, pulsing up and down rapidly with rainfall between 0.30" to 0.30" in 10-20 minutes before falling apart.






X

24
0.83"
0.88"
>1.75"
Map HPO issued at 0903 with a LOW Message potential in the Foothills and MOD potential in the Plains.  M1 issued at 1212 for the entire District, effective until 2200.  A strong cell formed rapidly just southeast of Castle Rock, with heavy rainfall, lare hail, gusty winds and frequent cloud-to-ground lightning.  The cell anchored in place for over an hour before weakening, but a gust front pushed northward and into the District, initating several storms over the next few hours.  By 1400 there was isolated heavy rainfall for northeastern Douglas County, and a line of thunderstorms along the outflow boundary north towards DIA.  Pockets of heavy rainfall impacted areas from eastern Denver County through Aurora and well into Arapahoe County.  The most impacted areas were outside of the District east of I-25, including heavy rainfall just north of Brighton.   One strong thunderstorm in northwestern Doublas and southern Jefferson County brough 0.25" to 0.75" in 10-20 minutes before moving into southern Denvr County and weakening.
X
X
X
X


X
X
25
0.35"
0.90"
>1.00"

HPO issued at 0916 with MOD Message potential for the entire District.  M1 issued at 1453 effective until 2100 for the entire District.  Cells pulsing up and down along the foothills struggled to move into the District until a weak disturbance pushed a cluster of stronger thunderstorms in from the north between 1400 and 1500.  These storms weakened as they entered, producing isolated thrunderstorms from Brighton, southeast and along the I-70 corridor, and strengthened again as they exited.  Areas just east of the District border in central Arapaho County saw moderate to heavy rainfall.

X






26
1.73"
2.51"
>1.75"
Map HPO issued at 0900 with MOD Message potential for the entire District.  M1 issued at 1408 for the entire District, effective until 2200.  Showers and thunderstorms that developed over the Front Range spilled into the District, beginning with and LIF for Douglas County at 1655 due to rainfall between 0.30"-0.75" in 10 to 30 minutes.  Originally headed out of the District to the southeast, it began to grow, linger and merge with other smaller cells, expanding into Arapahoe County.  Simultaneously Boulder County saw small cells merge until rainfall totals reached the same level.  Alarms were triggered within Arapahoe and Douglas Counties, with over 2.50" reported just southeast of the District.  Gust fronts initiated a secondary cluster of storms affecting Denver, Jefferson, Adams and Arapaho Counties with widespread and rather anchored movements resulting, again, in rainfall beween 0.30" and 0.75" in 10-30 minutes.
X
X
X


X
X
X
27
1.02"
0.97"
>0.75"
Map HPO issued at 0902 with LOW Message potential for the entire District.  M1 issued at 1636 for the entire District, effective until 2200.  Initial shower activity would mix out quickly, but a gust from a collapsing cell triggered  the formation of massive thunderstorms in under 30 minutes in northern Douglas County just after 1600.  Heavy rain well over 1.0" an hour per radar begain in Douglas County and moved slowly northeast into Arapahoe County and far southeastern Auror before the storm weakened as it left the District.   Another gust interaction brought rapid storm development for northern portions of the District between 1730 and 1800, with heavy rainfall in Adams County between the I-25 corridor and the I-76 corridor.  A lull in storm activity held until a storm formed over northern Jefferson County and moved into Boulder County between 2100 and 2300. 
X
X
X



X

28
0.79"
1.64"
>1.25"
Map HPO issued at 0940 with a LOW Message potential for the entire District.  M1 issued at 1557 effective until 2100.  Although storms struggled initially, remaining weak as they moved into the District from the southwest, a gust front from the east caused storm development first in the south (Arapahoe County and City of Aurora) and then northward (Adams and Denver Counties, DIA).  Minimal daytime heating, however, caused storm dissipation.
X




X


29
0.59"
0.76"
>0.50"

HPO issued at 0900 with a MOD Message potential for the Plains and LOW potential for the Foothills.  A strong cell developed n the foothills around 1130, producing moderate to brief heavy rainfall before its collapse.  A gust from the early storm pushed eastward and initiated strong storm development for Douglas and Arapahoe Counties.  Another shower developed over Adams County and moved northward, dropping over an inch of rain just north of the District.  Another LIF was issued after a long break, when another cell formed in Jefferson County and moved toward Douglas county, iwth isolated areas receiving 0.4"-0.8" in 10-30 minutes.








30
0.98"
1.11"
>1.00"

HPO issued at 0902 with NONE Message potential for the entire District; HPO issued at 1946 with a LOW Message potential for the entire District.  M1 issued at 1952 effective until 0200 9/21/2026.  After an initially dry day, a weak gust front from the east increased surface moisture and stirred the pot over the District around 2000, with pulse-like storms in a line from Douglas County to the Jefferson/Adams County border.  The NWS issued a Severe Thunderstorm Watch until 0300 for much of eastern Colorado and a Flood Adivsory for eastern Douglas County just before 2200.






X

31
1.65"
1.88"
>0.75"
Map HPO issued at 0950 with LOW Message potential for the entire District.  M1 issued at 1736 for the entire District, effective until 2100.   Initially conditions would be relatively normal for this time of year, with just a slight chance of late season showers/isolated thunderstorms.  Storms that formed along the higher terrain weaked as they moved off the foothills.  A few stronger storms developed along the Palmer Divide and a gust front moved into the region from the south/southwest, dramatically increasing both dew points and precipitable water values.  By 1730, a moderate to strong storm developed over northern Douglas County bringing 0.50" - 1.00" of rainfall.  As this storm rained out, a gust initiated additional storm development over northeastern Douglas and portions of Arapahoe County, triggering several rainfall alarms.  A Flash Flood Warning was issued at 1938, effective until 2230 but cancelled by 2110.






X

32
1.06"
1.04"
>0.50"

HPO issued 0943 with a MOD Message potential for the entire District.  M1 issued at 1903 for the entire District, effective until 2200.  Colorado was caught beween two upper level jets from a disintegrating low pressure system in Wyoming and an expansive high pressure in Texas.  The trend for gust fronts to spawn showers continued with a lone shower in the western part of the District around 1850 that quickly intenisified and posed a risk for Jefferson County including Arvada due to sluggish storm motion.  The storm expanded but barely moved  prior to beginning to dissipate around 2100.






X

33
0.35"
0.58"
>0.10"

HPO issued at 0916 with a MOD Message potential for the Plains, and a LOW potential for the Foothills.  M1 issued at 1522 for the entire District, effective until 2200.  The same two upper-level jets from the prior day helped provide the potential for late-season action.  A mass of showers developed southeast of the district and began moving north around 1520, producing rain of 0.10" to 0.40" in 10-30 minutesd as they passed over the District.  Showers remained light and moved out of the District around 1800.








34
2.05"
1.59"
>1.00"
Map HPO issued at 0901 with a HIGH Message potential for the Plains and MOD potential for the Foothills.  M1 issued at 1307 for the entire District, effective until 2100.  Portions of the District would see some of the heaviest rainfall of the season, as strong upper-level support and a passing disturbance got storms initiated between 1300-1400, anchored along the foothills before slowly moving east into the District around 1500.  The storms rapidly strengthened, between Golden and Arvada, bringing very isolated heavy rainfall to portions of Jefferson County.  Alarms for both 0.5" in 10 minutes and for 1.0" in 60 minutes were common at gages along the storm's path.  The cell not only strengthened but expanded as it moved into Aurora, stalling over the conjunction of  Adams/Arapahoe/Denver Counties and triggering additional alarms before moving out of the District and through DIA.
X
X
X


X


















































































 

 

Maximum 24-hour value

Maximum 24-hour value

Maximum

Radar

estimated

24-hour

precip

Alarm Log

Rainfall

Rate Alarm

 

ADAM

ARAP

AURA

BLDR

BROM

DENV

DOUG

JEFF