Alert archive / Colorado / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 40, NWS Grand Junction, CO

August 17, 2015Eagle County, Pitkin County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Aug 17, 2015, 4:40 PM MDT for Eagle County, Pitkin County, Colorado. It was in force for 35 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 17, 2015, 4:40 PM MDT (22:40 UTC)
Expired
Aug 17, 2015, 5:15 PM MDT
In force
35 min
Issued by
NWS Grand Junction, CO
Area
Storm-based polygon

Counties Eagle County, CO, Pitkin County, CO

The radar

The Grand Junction radar (KGJX), 128 km from the middle of the area, began a volume at 22:42 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

Denver, CO (KDEN), launched 12:00Z, 10.7 hours before the alert went out and 310 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, Denver, CO at 12:00Z on 2015-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 318 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, Denver, CO at 12:00Z on 2015-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 square meters per square second.1939587897Sfc1 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
318 J/kg
Mixed-layer CIN
-267 J/kg
Mixed-layer LCL
1605 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
5 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 9:56 AM MDTSpecial Weather StatementGJTMesa49 min
Aug 17, 10:37 AM MDTRed Flag WarningGJTMoffat, Rio Blanco13 hr
Aug 17, 1:43 PM MDTSpecial Weather StatementGJTEagle47 min
Aug 17, 3:11 PM MDTSpecial Weather StatementGJTPitkin49 min
Aug 17, 3:40 PM MDTSpecial Weather StatementGJTLa Plata50 min
Aug 17, 4:17 PM MDTSpecial Weather StatementGJTEagle28 min
Aug 17, 4:32 PM MDTSevere Thunderstorm WarningGJTArchuleta19 min
Aug 17, 5:26 PM MDTSpecial Weather StatementGJTGarfield49 min
Aug 17, 5:55 PM MDTSpecial Weather StatementGJTGarfield20 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2015Every severe thunderstorm warning in 2015

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.