Severe Thunderstorm Warning 106, NWS Denver/Boulder, CO

Area Forecast Discussion
National Weather Service Denver/Boulder CO
217 PM MDT Fri Jun 13 2025

.KEY MESSAGES...

- A few severe storms possible over the plains late this afternoon
  and evening. Less coverage and less intense showers/storms (but
  still gusty winds) over most of the I-25 Corridor and mountains.

- Drying trend this weekend with the chance for thunderstorms
  mostly confined to the northeast plains.

- Summer heat this weekend through Monday. Brief respite Tuesday
  and Wednesday, but then hot again end of next week.

&&

.DISCUSSION /Through Friday/...
Issued at 217 PM MDT Fri Jun 13 2025

Water vapor satellite imagery showing drier air has moved over
the area and even drier air is upstream for this weekend. For the
rest of this afternoon/evening we'll see high-based showers and
thunderstorms form and then progress eastward across the higher
terrain and urban corridor. Wind gusts up to 50 mph will be
possible with the showers/storms, any rainfall is expected to be
short lived. As storms continue eastward, they will encounter an
increasingly unstable airmass over eastern Colorado. MLCAPES of
1500-2500 J/kg are more than enough for severe storms with large
hail and damaging winds. However, shear won't be that great with
0-6km bulk shear of 25 to 35 knots. The stronger flow aloft and
better shear will be to the north of Colorado. So we don't expect
strong supercell thunderstorms, but the multicellular storms still
could produce golf ball sized hail and 70 mph winds. The greatest
threat window is 6PM to 10PM and the area will be east of a line
from Cheyenne to Fort Morgan to Limon.

Upper level ridging centered over the Central and Southern
Rockies this weekend, then shifting slightly eastward on Monday.
This will result in very warm temperatures all 3 days with highs
in the 90s across northeast Colorado. Cross sections show some mid
level moisture, which is expected to result in isolated high-
based showers. Chances rainfall reaches the ground are low, but
gusty winds will likely occur during the mid afternoon to early
evening hours each day. Over eastern Colorado, southeast lower
level winds will help hold moisture in place. The warm
temperatures combined with the moisture will yield 1500-3000
MLCAPE. However with the ridge overhead, mid level temperatures
will be warm and flow aloft will be weak, greatly limiting the
severe weather threat. However, the far northeast plains will see
the strongest flow aloft and have the greatest chance at seeing
strong/severe storms each day (Saturday-Monday).

On Tuesday, an upper level trough pushes eastward across the
Central Rockies Tuesday. This will bring a cold front and cooler
temperatures with highs in the 80s across northeast Colorado. This
system will also bring a chance for showers and thunderstorms.
The ECMWF ensembles generally favor showers and storms, while the
GFS ensembles lean on the drier side. Will keep a mention of
showers and storms in the forecast for Tuesday. The trough shifts
east of the region by Wednesday. Northwest flow behind the trough
will bring drier weather back to the region. Temperatures will
stay below 90F one more day on Wednesday before the upper level
ridge rebuilds over the Central and Southern Rockies. The ridging
overhead will bring very warm air back to the area for Thursday
and Friday with highs in the 90s across northeast Colorado. The
heat continues into next weekend (June 21st & 22nd) with a strong
summer ridge over the region or just east of us. Highs are
expected to continue to be well into the 90s with a few low 100s
possible.

&&

.AVIATION /18Z TAFS through 18Z Saturday/...
Issued at 1115 AM MDT Fri Jun 13 2025

VFR conditions are expected through tonight and Saturday. Weak
southeast winds to prevail before showers and thunderstorms
develop over the higher terrain and push eastward. Main threat
with this will be gusty winds to around 35 knots, possibly ~(10%
chance) up to around 45 knots near the stronger downdrafts. Chance
for a thunderstorm is still around 30% at the DEN airports, but
chances for gusty outflow winds and wind shifts are high (greater
than 90%). Threat for showers and storms ends 00Z to 01Z as they
move off to the east. A typical wind pattern is expected after 00Z
Saturday with east to southeast winds (possibly gusty from
exiting storms) at first, then turning a typical southerly
drainage direction. Like this morning, low clouds will be possible
over northeast Colorado, but are expected to stay north and east
of the Denver area.

For Saturday, winds will generally be light, becoming east to
southeast after 18Z. Dry microbursts with wind gusts to 30 knots
will be possible from high-based showers after 21Z Saturday.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.

&&

DISCUSSION...Meier
AVIATION...Meier

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
742 AM MDT Fri Jun 13 2025

COZ030>051-141345-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
742 AM MDT Fri Jun 13 2025

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

A few strong to severe thunderstorms will develop over the
northeast plains late this afternoon. The thunderstorms continue
to push eastward this evening. The severe weather threat will be
greater along and east of a line from Greeley to Deer Trail to
Limon. Large hail, damaging winds, and locally heavy rainfall
will be possible from any severe thunderstorm.

Meanwhile farther west, showers and thunderstorms over the higher
terrain and I-25 corridor will be weaker with gusty winds and
brief rainfall.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

For the weekend and Monday, it turns very warm with highs in the
90s across northeast Colorado. The chance for thunderstorms will
be limited to the northeast plains, where a severe storm or two
will be possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

Special Weather Statement
National Weather Service Denver CO
402 PM MDT Fri Jun 13 2025

COZ040-043-045-132230-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County CO-Central and South
Weld County CO-Central and East Adams and Arapahoe Counties CO-
402 PM MDT Fri Jun 13 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN DENVER...SOUTH
CENTRAL WELD AND NORTHWESTERN ADAMS COUNTIES UNTIL 430 PM MDT...

At 402 PM MDT, Doppler radar was tracking a strong thunderstorm 5
miles south of Hudson, or 26 miles northeast of Denver, moving
northeast at 15 mph.

HAZARD...Landspouts, wind gusts of 50 to 55 mph, and penny size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds
could knock down tree limbs and blow around unsecured objects.

Locations impacted include...
  Northeastern Commerce City, Brighton, northern Denver
  International Airport, Fort Lupton, Lochbuie, Hudson, Keenesburg,
  Prospect Valley, Barr Lake, Todd Creek and Wattenburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

If on or near a lake, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

If a tornado is spotted seek shelter inside a sturdy building.

&&

LAT...LON 4000 10486 4002 10488 4023 10456 4000 10427
      3985 10472
TIME...MOT...LOC 2202Z 238DEG 15KT 4000 10460

LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 TO 55 MPH

RPK

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Preliminary Local Storm Report
National Weather Service Denver CO
444 PM MDT Fri Jun 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0410 PM     Tornado          2 SSW Lochbuie          39.97N 104.74W
06/13/2025                   Adams              CO   Trained Spotter

            Landspout tornado confirmed by Denver
            International Airport observer as well as
            trained spotter and public sources. Location
            is approximate.

&&

BR

Special Weather Statement
National Weather Service Denver CO
512 PM MDT Fri Jun 13 2025

COZ046-047-049-140000-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Washington County CO-Southeast Elbert County Below
6000 Feet/South Lincoln County CO-
512 PM MDT Fri Jun 13 2025

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT SOUTHWESTERN
WASHINGTON...EAST CENTRAL ELBERT AND NORTHEASTERN LINCOLN COUNTIES
UNTIL 6 PM MDT...

At 512 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from 12 miles south of Last Chance to 9
miles north of Punkin Center, or extending from 22 miles north of
Limon to 20 miles south of Limon, moving east at 15 mph.

HAZARD...Wind gusts up to 50 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is possible.

Locations impacted include...
  Limon, Hugo and Genoa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

If on or near a lake, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3894 10381 3924 10373 3960 10368 3961 10323
      3917 10332 3884 10341
TIME...MOT...LOC 2312Z 277DEG 11KT 3957 10355 3921 10358 3898 10365

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

RPK

Special Weather Statement
National Weather Service Denver CO
538 PM MDT Fri Jun 13 2025

COZ044-140015-
Morgan County CO-
538 PM MDT Fri Jun 13 2025

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL MORGAN COUNTY UNTIL 615
PM MDT...

At 538 PM MDT, Doppler radar was tracking a strong thunderstorm over
Log Lane Village, or near Fort Morgan, moving east at 15 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is possible.

Locations impacted include...
  Fort Morgan, Log Lane Village and Fort Morgan Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 4015 10393 4032 10403 4038 10384 4019 10371
TIME...MOT...LOC 2338Z 247DEG 11KT 4025 10388

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 TO 55 MPH

RPK

Preliminary Local Storm Report
National Weather Service Denver CO
551 PM MDT Fri Jun 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0535 PM     Hail             6 E Wiggins             40.25N 103.96W
06/13/2025  M1.00 Inch       Morgan             CO   Trained Spotter

&&

BR