Alert archive / Colorado / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 384, NWS Denver/Boulder, CO

September 5, 2026Logan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 5, 2026, 9:58 PM MDT for Logan County, Colorado. It was in force for 38 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
Sep 5, 2026, 9:58 PM MDT (03:58 UTC)
Expired
Sep 5, 2026, 10:36 PM MDT
In force
38 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 150 km from the middle of the area, began a volume at 03:58 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, 4.0 hours before the alert went out and 216 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 2026-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2324 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 2026-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 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
2324 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
1791 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
254 m²/s²
Significant tornado parameter
0.5
Supercell composite
15.8

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 6:55 PM MDTAreal Flood AdvisoryBOULincoln3 hr
Sep 5, 8:09 PM MDTSevere Thunderstorm WarningBOULogan, Weld36 min
Sep 5, 8:23 PM MDTAreal Flood AdvisoryBOUWeld3 hr
Sep 5, 9:14 PM MDTSpecial Weather StatementBOULogan46 min
Sep 5, 9:22 PM MDTSevere Thunderstorm WarningBOULogan23 min
Sep 5, 9:54 PM MDTSpecial Weather StatementBOULogan51 min
Sep 5, 10:35 PM MDTAreal Flood AdvisoryBOULogan, Sedgwick3 hr
Sep 5, 11:07 PM MDTSpecial Weather StatementBOUPhillips, Sedgwick38 min
Sep 6, 4:50 PM MDTSpecial Weather StatementBOUDenver40 min
Sep 6, 5:13 PM MDTAreal Flood AdvisoryBOUArapahoe, Douglas116 min
Sep 6, 5:42 PM MDTSpecial Weather StatementBOUBroomfield, Denver48 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2026Every severe thunderstorm warning in 2026

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.