Alert archive / Colorado / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 277, NWS Denver/Boulder, CO

August 22, 2024Logan County, Phillips County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 22, 2024, 8:29 PM MDT for Logan County, Phillips County, Washington County, Colorado. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 22, 2024, 8:29 PM MDT (02:29 UTC)
Expired
Aug 22, 2024, 8:51 PM MDT
In force
22 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Logan County, CO, Phillips County, CO, Washington County, CO

The radar

The Goodland radar (KGLD), 156 km from the middle of the area, began a volume at 02:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 22, 5:24 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.5 hours before the alert went out and 208 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2024-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 776 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2024-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
776 J/kg
Mixed-layer CIN
-231 J/kg
Mixed-layer LCL
992 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 5:42 PM MDT, 2 hours 47 minutes earlier.

Area forecast discussion, Aug 22, 5:42 PM MDT, 2 hours 47 minutes before
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Hazardous weather outlook, Aug 22, 11:01 AM MDT, 9 hours 28 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1101 AM MDT Thu Aug 22 2024

COZ030>051-231715-
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-
1101 AM MDT Thu Aug 22 2024

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

.DAY ONE...Today and Tonight

Widespread showers and thunderstorms are forecast across the
mountains today, and will gradually spread into the I-25 corridor
and plains this afternoon and evening. These storms will be
capable of producing heavy rainfall, which could lead to
localized flooding issues across the burn areas, and in locations
that have recently received heavy rain. A few strong to severe
storms are also possible, mainly east of I-25 this evening.
Stronger storms could produce damaging winds and large hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Friday through Sunday there will be scattered afternoon and
evening thunderstorms over the mountains with isolated storms on
the plains. The primary threat these storms will pose is strong
wind gusts potentially above 50 mph. There is a limited threat of
flash flooding on the recent burn areas, mainly on Friday.
Elevated fire weather conditions may develop across the foothills
and plains this weekend due to warm, dry, and breezy conditions.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight, but
reports of heavy rain, hail, and strong winds will be appreciated.

Meier/Gimmestad

In the hours before

Special weather statement, Aug 22, 4:36 PM MDT, 3 hours 53 minutes before
Special Weather Statement
National Weather Service Denver CO
436 PM MDT Thu Aug 22 2024

COZ041-046-222300-
Elbert/Central and East Douglas Counties Above 6000 Feet CO-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
436 PM MDT Thu Aug 22 2024

...A STRONG THUNDERSTORM WILL IMPACT NORTH CENTRAL ELBERT COUNTY
THROUGH 500 PM MDT...

At 436 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of Kiowa, or 34 miles west of Limon, moving northeast
at 20 mph.

HAZARD...Wind gusts up to 40 mph and penny size hail.

SOURCE...Radar indicated.

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

This storm will remain over mainly rural areas of north central
Elbert County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3923 10439 3929 10444 3949 10422 3931 10406
TIME...MOT...LOC 2236Z 235DEG 19KT 3930 10434

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

RODRIGUEZ
Special weather statement, Aug 22, 4:49 PM MDT, 3 hours 40 minutes before
Special Weather Statement
National Weather Service Denver CO
449 PM MDT Thu Aug 22 2024

COZ036-040-041-222315-
Elbert/Central and East Douglas Counties Above 6000 Feet CO-
North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe
Counties/East Broomfield County CO-
Jefferson and West Douglas Counties Above  6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet CO-
449 PM MDT Thu Aug 22 2024

...A STRONG THUNDERSTORM WILL IMPACT EASTERN DOUGLAS AND WEST CENTRAL
ELBERT COUNTIES THROUGH 515 PM MDT...

At 448 PM MDT, Doppler radar was tracking a strong thunderstorm 4
miles north of Larkspur, or 30 miles south of Denver, moving
northeast at 45 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Southwestern Highlands Ranch, Castle Rock, southwestern Parker,
Roxborough Park, Elizabeth, Larkspur, Perry Park, Louviers, The
Pinery, Franktown, Ponderosa Park, Castle Pines, Sedalia, and
Greenland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3913 10490 3930 10509 3954 10502 3939 10448
TIME...MOT...LOC 2248Z 230DEG 39KT 3929 10489

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

RODRIGUEZ
Special weather statement, Aug 22, 5:18 PM MDT, 3 hours 11 minutes before
Special Weather Statement
National Weather Service Denver CO
518 PM MDT Thu Aug 22 2024

COZ040-041-045-222345-
Elbert/Central and East Douglas Counties Above 6000 Feet CO-
Central and East Adams and Arapahoe Counties CO-
North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe
Counties/East Broomfield County CO-
518 PM MDT Thu Aug 22 2024

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN DOUGLAS...
NORTHWESTERN ELBERT AND WESTERN ARAPAHOE COUNTIES THROUGH 545 PM
MDT...

At 517 PM MDT, Doppler radar was tracking a strong thunderstorm over
eastern Parker, or 17 miles southeast of Denver, moving northeast at
40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Aurora, eastern Centennial, Parker, The Pinery, Buckley SFB, Arapahoe
Park, and northeastern Castle Pines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3941 10475 3950 10487 3977 10474 3960 10435
      3956 10443 3957 10448 3956 10449 3956 10447
      3955 10446
TIME...MOT...LOC 2317Z 219DEG 36KT 3952 10474

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

RODRIGUEZ
Local storm report, Aug 22, 5:31 PM MDT, 2 hours 58 minutes before
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Local storm report, Aug 22, 5:57 PM MDT, 2 hours 32 minutes before
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Local storm report, Aug 22, 6:16 PM MDT, 2 hours 13 minutes before
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The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 22, 9:09 PM MDTAreal Flood AdvisoryBOULogan, Phillips, Washington3 hr
Aug 23, 1:23 PM MDTAreal Flood AdvisoryBOULarimer2 hr
Aug 23, 2:27 PM MDTSpecial Weather StatementBOUBroomfield33 min
Aug 23, 2:57 PM MDTSpecial Weather StatementBOUDenver33 min
Aug 23, 3:08 PM MDTSpecial Weather StatementBOUWashington37 min
Aug 23, 3:35 PM MDTSpecial Weather StatementBOUAdams, Arapahoe40 min
Aug 23, 4:04 PM MDTSpecial Weather StatementBOUMorgan26 min
Aug 23, 4:17 PM MDTSpecial Weather StatementBOUWeld28 min
Aug 23, 4:37 PM MDTSevere Thunderstorm WarningBOUWeld38 min
Aug 23, 4:45 PM MDTSpecial Weather StatementBOUMorgan30 min
Aug 23, 4:51 PM MDTSpecial Weather StatementBOUMorgan24 min
Aug 23, 4:56 PM MDTSevere Thunderstorm WarningBOUWeld34 min
Aug 23, 5:18 PM MDTSevere Thunderstorm Warning Considerable damage threatBOULogan, Weld42 min
Aug 23, 5:21 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington39 min
Aug 23, 5:54 PM MDTSevere Thunderstorm WarningBOULogan, Washington51 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2024Every severe thunderstorm warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.