Alert archive / Wyoming / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 372

May 31, 19977 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at May 31, 1997, 6:30 PM MDT for 7 counties in Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 31, 1997, 6:30 PM MDT (00:30 UTC)
Expired
Jun 1, 1997, 12:00 AM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Park County, WY, Sublette County, WY, Teton County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 139 km from the middle of the area, began a volume at 00:32 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.

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 31, 8:05 PM MDTSevere Thunderstorm WarningRIWPark45 min

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 0.5 hours before the alert went out and 143 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, Riverton, WY at 00:00Z on 1997-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 385 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 00:00Z on 1997-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -24 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
385 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
2964 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-24 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 1, 2:45 PM MDTSevere Thunderstorm WatchSPCConverse, Natrona, Niobrara, Weston6 hr
Jun 1, 4:45 PM MDTTornado WatchSPCGoshen, Laramie6 hr

Nearby

Severe Thunderstorm Watches in Wyoming, 1997Every severe thunderstorm watch 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.