Alert archive / Colorado / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 211, NWS Denver/Boulder, CO

August 2, 20244 counties in Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 2, 2024, 7:29 PM MDT for 4 counties in Colorado. It was in force for 46 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 2, 2024, 7:29 PM MDT (01:29 UTC)
Expired: Aug 2, 2024, 8:15 PM MDT
In force: 46 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Arapahoe County, CO, Elbert County, CO, Lincoln County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 73 km from the middle of the area, began a volume at 01:32 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.5 hours before the alert went out and 328 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1528 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 2120 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 2, 5:51 PM MDT, 1 hour 38 minutes earlier.

Area forecast discussion, Aug 2, 5:51 PM MDT, 1 hour 38 minutes before

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Hazardous weather outlook, Aug 2, 10:55 AM MDT, 8 hours 34 minutes before

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1055 AM MDT Fri Aug 2 2024

COZ030>051-031700-
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-
1055 AM MDT Fri Aug 2 2024

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

.DAY ONE...Today and Tonight

Above normal temperatures continue today. Scattered thunderstorms
this afternoon with a few stronger storms possible on the plains.
Strong gusty winds up to 60 mph possible. Isolated showers/storms
west over urban corridor and mountains. These showers or storms
may produce outflows with variable gusts. Can't rule out the low
threat for flash flooding over the new Alexander Mountain burn
area. Heavy rain is unlikely, but it likely wouldn't take much
rain to produce impacts. Areas of smoke will also linger across
the areas as well with hazy skies.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Hot temperatures will continue over the forecast area into next
week. Areas of smoke will be a good bet as well. Isolated to
scattered late day showers and thunderstorms are expected through
Sunday. Afternoon thunderstorms coverage is expected to increase
next week, with likely coverage in the mountains and scattered
coverage on the plains Monday through Sunday. The main threat
with the storms through the weekend will be strong wind gusts
topping 40 mph and small hail. By Sunday, continuing into next
week, the threat of heavy rainfall is expected with the storms as
moisture remains over the forecast area.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

In the hours before

Special weather statement, Aug 2, 4:06 PM MDT, 3 hours 23 minutes before

Special Weather Statement
National Weather Service Denver CO
406 PM MDT Fri Aug 2 2024

COZ045-046-022245-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Central and East Adams and Arapahoe Counties CO-
406 PM MDT Fri Aug 2 2024

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN ELBERT AND
SOUTHEASTERN ARAPAHOE COUNTIES THROUGH 445 PM MDT...

At 405 PM MDT, Doppler radar was tracking a strong thunderstorm 5
miles south of Deer Trail, or 26 miles northwest of Limon, moving
east 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.

Locations impacted include...
Deer Trail, Agate, and Cottonwood Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3943 10413 3957 10417 3971 10371 3957 10371
      3956 10368 3941 10366
TIME...MOT...LOC 2205Z 267DEG 15KT 3954 10405

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

HIRIS

Special weather statement, Aug 2, 4:39 PM MDT, 2 hours 50 minutes before

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Special weather statement, Aug 2, 5:18 PM MDT, 2 hours 11 minutes before

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Special weather statement, Aug 2, 5:26 PM MDT, 2 hours 3 minutes before

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Special weather statement, Aug 2, 5:36 PM MDT, 1 hour 53 minutes before

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Local storm report, Aug 2, 5:57 PM MDT, 1 hour 32 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 6:13 PM MDT	Special Weather Statement	BOU	Logan, Washington	47 min
Aug 2, 6:17 PM MDT	Special Weather Statement	BOU	Boulder	28 min
Aug 2, 6:27 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington	48 min
Aug 2, 7:08 PM MDT	Severe Thunderstorm Warning	BOU	Washington	37 min
Aug 2, 7:12 PM MDT	Special Weather Statement	BOU	Washington	48 min
Aug 2, 8:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Arapahoe, Elbert	52 min
Aug 2, 8:29 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Elbert	46 min
Aug 2, 9:13 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	22 min
Aug 2, 9:33 PM MDT	Special Weather Statement	BOU	Elbert, Lincoln	42 min
Aug 2, 10:13 PM MDT	Special Weather Statement	BOU	Lincoln	47 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2024 Every 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.