Alert archive / Wyoming / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 142, NWS Cheyenne, WY

July 31, 1996Converse County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 31, 1996, 1:43 PM MDT for Converse County, Wyoming. It was in force for 62 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: Jul 31, 1996, 1:43 PM MDT (19:43 UTC)
Expired: Jul 31, 1996, 2:45 PM MDT
In force: 62 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Converse County, WY

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.7 hours before the alert went out and 235 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 455 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1466 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 31, 9:19 AM MDT, 4 hours 24 minutes before

WYZ059>070-NEZ001>003-019>021-054-055-312300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
920 AM MDT WED JUL 31 1996

THE SEVERE WEATHER POTENTIAL IN THE COUNTY WARNING AREA OF THE CHEYENNE
NATIONAL WEATHER SERVICE OFFICE IS MEDIUM THIS AFTERNOON AND
EVENING...MAINLY IN THE NEBRASKA PANHANDLE.

SPOTTER ACTIVATION MAY BE NECESSARY FOR THE NEBRASKA PANHANDLE.

DISCUSSION...THE AIRMASS OVER SOUTHEAST WYOMING IS EXPECTED TO DRY OUT
SOME DURING THE DAY AS A SURFACE LOWS PRESSURE TROUGH MOVES E OF THE
STATE WITH DOWNSLOPE WESTERLY FLOW DEVELOPING AT THE SURFACE DURING THE
AFTERNOON.  THE AIRMASS OVER THE NEBRASKA WILL REMAIN MOIST TODAY AS
SOUTHEAST UPSLOPE WINDS KEEP DEW POINTS IN THE UPPER 50S.  BETTER
INSTABILITIES AND CONVECTIVE POTENTIAL ENERGY ARE PROGED OVER THE
NEBRASKA PANHANDLE THIS AFTERNOON AND EVENING.  THE WIND PROFILE WILL
ALSO REMAIN FAVORABLE FOR THE FORMATION OF SOME SUPER CELLS OVER THE
NEBRASKA PANHANDLE.

THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN SOUTHEAST WYOMING AND
THE NEBRASKA PANHANDLE:

WY...ALBANY   CARBON   CONVERSE   GOSHEN   LARAMIE   NIOBRARA   PLATTE
NE...BANNER   BOX BUTTE   CHEYENNE   DAWES   KIMBALL   MORRILL   SIOUX
     STCOTTS BLUFF

WCJIN-WYSE-WYNE
PAL

Special weather statement, Jul 31, 12:17 PM MDT, 1 hour 26 minutes before

WYZ059-064-066-067-069-070-311900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1210 PM MDT WED JUL 31 1996

AT 1205 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS DEVELOPING
OVER EAST CENTRAL AND SOUTHEAST WYOMING.  ONE STORM THAT DEVELOPED
OVER EASTERN NATRONA COUNTY WAS MOVING INTO THE WEST END OF CONVERSE
COUNTY AND WAS LOCATED 15 MILES WEST OF GLENROCK OR 35 MILES WEST
NORTHWEST OF DOUGLAS.  A SECOND STRONG THUNDERSTORM WAS LOCATED
25 MILES NORTHWEST OF WHEATLAND IN PLATTE COUNTY.  A THIRD STORM
WAS LOCATED OVER NORTH CHEYENNE.  THIS STORM WAS PRODUCING SMALL
HAIL...1/2 INCH IN DIAMETER.  STORMS WERE MOVING TO THE SOUTHEAST AT
20 MILES AN HOUR.

SMALL HAIL...XBRIEF HEAVY RAIN...DANGEROUS LIGHTNING AND GUSTY WINDS
TO 45 MILES AN HOUR CAN BE EXPECTED WITH THESE STORMS UNTIL 115 PM.

WCJIN-WYSE-WYNE
PAL

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 7:04 PM MDT	Severe Thunderstorm Warning	CYS	Banner	26 min
Jul 30, 7:30 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	45 min
Jul 30, 8:15 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	25 min
Jul 31, 3:07 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	68 min
Jul 31, 4:10 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Sioux	30 min
Jul 30, 6:44 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	31 min
Jul 31, 2:00 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	60 min
Jul 31, 2:04 PM MDT	Tornado Warning	CYS	Niobrara	56 min
Jul 31, 2:28 PM MDT	Tornado Warning	CYS	Converse	32 min
Jul 31, 2:40 PM MDT	Tornado Warning	CYS	Goshen	50 min
Jul 31, 2:52 PM MDT	Tornado Warning	CYS	Laramie	38 min
Jul 31, 3:28 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	47 min
Jul 31, 3:35 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	40 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1996 Every severe thunderstorm warning in 1996

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.