Alert archive / Colorado / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 28, NWS Grand Junction, CO

September 20, 1997Delta County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Sep 20, 1997, 4:14 PM MDT for Delta County, 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
Sep 20, 1997, 4:14 PM MDT (22:14 UTC)
Expired
Sep 20, 1997, 5:00 PM MDT
In force
46 min
Issued by
NWS Grand Junction, CO
Area
Whole counties

County Delta County, CO

The radar

The Grand Junction radar (KGJX), 38 km from the middle of the area, began a volume at 22:16 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 20, 2:00 PM MDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 10.2 hours before the alert went out and 63 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, Grand Junction, CO at 12:00Z on 1997-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 197 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, Grand Junction, CO at 12:00Z on 1997-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 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
197 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
696 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
209 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 1:31 PM MDTSevere Thunderstorm WarningGJTMoffat, Rio Blanco34 min
Sep 20, 1:46 PM MDTSevere Thunderstorm WarningGJTMesa34 min
Sep 20, 2:01 PM MDTSevere Thunderstorm WarningGJTMoffat, Rio Blanco29 min
Sep 20, 2:31 PM MDTSevere Thunderstorm WarningGJTMoffat64 min
Sep 20, 2:43 PM MDTSevere Thunderstorm WarningGJTGarfield62 min
Sep 20, 3:24 PM MDTSevere Thunderstorm WarningGJTMoffat61 min
Sep 20, 3:43 PM MDTSevere Thunderstorm WarningGJTMoffat, Routt47 min
Sep 20, 3:55 PM MDTSevere Thunderstorm WarningGJTGarfield30 min
Sep 20, 4:34 PM MDTSevere Thunderstorm WarningGJTRoutt46 min
Sep 20, 5:04 PM MDTSevere Thunderstorm WarningGJTGarfield, Mesa61 min
Sep 20, 5:48 PM MDTSevere Thunderstorm WarningGJTDelta, Montrose32 min
Sep 20, 2:27 PM MDTSevere Thunderstorm WarningGJTGrand48 min
Sep 20, 3:18 PM MDTSevere Thunderstorm WarningGJTGrand62 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1997Every severe thunderstorm warning in 1997

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.