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> 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 heavy rainfall event developed as a front combined
with an upper-level disturbance to initiate storms along the higher
terrain, pulsing between 1400 and 1600. Gust fronts 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
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X
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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
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| X
| X
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|
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.
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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.
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| X
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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
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| X
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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.
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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
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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.
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| X
| X
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X
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| X
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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 |
|
