Alert archive / Colorado / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 385, NWS Denver/Boulder, CO

September 6, 2026Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 6, 2026, 6:54 PM MDT for Weld County, Colorado. It was in force for 26 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 6, 2026, 6:54 PM MDT (00:54 UTC)
Expired
Sep 6, 2026, 7:20 PM MDT
In force
26 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 75 km from the middle of the area, began a volume at 00:57 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 00:00Z, 0.9 hours before the alert went out and 410 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 00:00Z on 2026-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1378 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 00:00Z on 2026-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.19395878Sfc1 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
1378 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
2360 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 6:21 PM MDTSpecial Weather StatementBOUWeld39 min
Sep 6, 6:26 PM MDTSpecial Weather StatementBOUAdams49 min
Sep 6, 7:17 PM MDTSevere Thunderstorm WarningBOUWeld28 min
Sep 6, 9:44 PM MDTSpecial Weather StatementBOUGilpin46 min
Sep 6, 10:42 PM MDTSpecial Weather StatementBOULarimer33 min
Sep 6, 10:52 PM MDTSevere Thunderstorm WarningBOULarimer, Weld38 min
Sep 6, 11:23 PM MDTAreal Flood AdvisoryBOULarimer2 hr
Sep 7, 5:26 PM MDTSpecial Weather StatementBOUMorgan49 min
Sep 7, 5:39 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Washington51 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.