Alert archive / Colorado / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 181, NWS Denver/Boulder, CO

July 17, 2024Logan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 17, 2024, 3:35 PM MDT for Logan County, Colorado. It was in force for 40 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
Jul 17, 2024, 3:35 PM MDT (21:35 UTC)
Expired
Jul 17, 2024, 4:15 PM MDT
In force
40 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 150 km from the middle of the area, began a volume at 21:38 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

Rapid City, SD (KUNR), launched 12:00Z, 9.6 hours before the alert went out and 372 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, Rapid City, SD at 12:00Z on 2024-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 716 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, Rapid City, SD at 12:00Z on 2024-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
716 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1023 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 6:29 AM MDTSpecial Weather StatementBOUWeld31 min
Jul 17, 12:27 PM MDTSpecial Weather StatementBOUGilpin33 min
Jul 17, 12:57 PM MDTSpecial Weather StatementBOUClear Creek33 min
Jul 17, 1:37 PM MDTSpecial Weather StatementBOUJefferson23 min
Jul 17, 1:59 PM MDTSpecial Weather StatementBOUJefferson31 min
Jul 17, 2:03 PM MDTSpecial Weather StatementBOULogan27 min
Jul 17, 2:47 PM MDTSpecial Weather StatementBOUArapahoe28 min
Jul 17, 3:27 PM MDTSpecial Weather StatementBOULogan48 min
Jul 17, 4:23 PM MDTSpecial Weather StatementBOUMorgan52 min
Jul 17, 4:49 PM MDTSevere Thunderstorm WarningBOULogan, Washington41 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.