Alert archive / Nebraska / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 39, NWS Cheyenne, WY

May 15, 1991Garden County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 15, 1991, 8:37 PM MDT for Garden County, Nebraska. It was in force for 50 min.

The area

The counties it named.

The facts

Issued
May 15, 1991, 8:37 PM MDT (02:37 UTC)
Expired
May 15, 1991, 9:27 PM MDT
In force
50 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Garden County, NE

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 2.6 hours before the alert went out and 276 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 1991-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1991-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -34 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
669 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-34 m²/s²
0-3 km storm-relative helicity
279 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, May 15, 2:45 PM MDT, 5 hours 52 minutes before
WYZ017-152200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
245 PM MDT WED MAY 15 1991

...A TORNADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM
THIS EVENING...

THUNDERSTORMS HAVE DEVELOPED IN NORTHEAST COLORADO THIS AFTERNOON.  AT
240PM STRONG STORMS WERE LOCATED ABOUT 20 MILES SOUTHWEST OF CHEYENNE
MOVING NORTHWEST AT 25 MILE AN HOUR.  AT THIS SPEED...THEY SHOULD MOVE
INTO THE CHEYENNE AREA WITHIN THE HOUR.

THESE STORMS COULD PRODUCE HAIL...STRONG WINDS AND BRIEF HEAVY RAIN.

PEOPLE IN AND AROUND CHEYENNE ARE URGED TO KEEP AN EYE ON THE WEATHER
AND TO BE PREPARED TO MOVE TO A SAFE PLACE IN CASE THREATENING WEATHER
APPROACHES.

A TORNADO WATCH IES IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM
THIS EVENING.

A FLASH FLOOD WATCH REMAINS IN EFFECT FOR SOUTHEAST WYOMING UNTIL
10PM THIS EVENING.

CGB
Special weather statement, May 15, 2:48 PM MDT, 5 hours 49 minutes before
WYZ017-152200-

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
247 PM MDT WED MAY 15 1991

...A TORNADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM
THIS EVENING...

THUNDERSTORMS HAVE DEVELOPED IN NORTHEAST COLORADO THIS AFTERNOON.  AT
240PM STRONG STORMS WERE LOCATED ABOUT 20 MILES SOUTHEAST OF CHEYENNE
MOVING NORTHWEST AT 25 MILE AN HOUR.  AT THIS SPEED...THEY SHOULD MOVE
INTO THE CHEYENNE AREA WITHIN THE HOUR.

THESE STORMS COULD PRODUCE HAIL...STRONG WINDS AND BRIEF HEAVY RAIN.

PEOPLE IN AND AROUND CHEYENNE ARE URGED TO KEEP AN EYE ON THE WEATHER
AND TO BE PREPARED TO MOVE TO A SAFE PLACE IN CASE THREATENING WEATHER
APPROACHES.

A TORNGADO WATCH IS IN EFFECT FOR EXTREME SOUTHEAST WYOMING UNTIL 7PM
THIS EVENING.

A FLASH FLOOD WATCH REMAINS IN EFFECT FOR SOUTHEAST WYOMING UNTIL
10PM THIS EVENING.

CGB
Special weather statement, May 15, 4:16 PM MDT, 4 hours 21 minutes before
NEZ-001-005-011-152315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
415 PM MDT TUE MAY 14 1991

...TORNADO WATCH NUMBER 338 IN EFFECT UNTIL 7 PM MDT AND A FLASH FLOOD
   WATCH IN EFFECT UNTIL MIDNIGHT...
...THUNDERSTORMS IN KIMBALL COUNTY...

AT 413 PM MDT...RADAR INDICATED STRONG THUNDERSTORMS IN WESTERN KIMBALL
COUNTY.  THE STRONGEST THUNDERSTORM WAS 45 MILES WEST OF SIDNEY OR 15
MILES SOUTHWEST OF KIMBALL IN KIMBALL COUNTY OF THE NEBRASKA PANHANDLE.
THE STORMS WERE MOVING NORTHWEST AT 15 MPH.

HEAVY RAIN...HAIL AND STRONG GUSTY WIND ARE POSSIBLE WITH THESE STORMS
AS THEY MOVE NORTHWEST THROUGH KIMBALL COUNTY UNTIL 515 PM MDT.
SALMONS
Special weather statement, May 15, 7:05 PM MDT, 1 hour 32 minutes before
WYZ017-160200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
705 PM MDT WED MAY 15 1991

...THE TORNADO WATCH FOR EXTREME SOUTHEAST WYOMING HAS BEEN ALLOWED
TO EXPIRE...

THE TORNADO WATCH POSTED EARLIER FOR EXTREME SOUTHEAST WYOMING HAS
BEEN ALLOWED TO EXPIRE.  HOWEVER...AT 700 PM MDT...A FEW THUNDERSTORMS
CONTINUED TO MOVE NORTH AT 15 MILES AN HOUR ALONG THE NEBRASKA BORDER.

THESE STORMS WILL STILL AFFECT EASTERN GOSHEN COUNTY...INCLUDING THE
TOWN OF TORRINGTON.  THESE THUNDERSTORMS WILL PRODUCE STRONG WINDS...
BRIEF HEAVY RAIN...SMALL HAIL..AND DEADLY LIGHTNING.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  STAY INSIDE UNTIL THE STORM PASSES.

VIRGILLITO

The office that day

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

IssuedProductOfficeCountiesLasted
May 15, 6:01 PM MDTSevere Thunderstorm WarningCYSBanner, Cheyenne, Kimball35 min
May 15, 6:01 PM MDTSevere Thunderstorm WarningCYSScotts Bluff35 min
May 15, 6:36 PM MDTSevere Thunderstorm WarningCYSBanner, Cheyenne, Morrill, Scotts Bluff39 min
May 15, 7:47 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill43 min
May 15, 7:47 PM MDTSevere Thunderstorm WarningCYSSioux43 min
May 15, 8:37 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill50 min
May 15, 8:38 PM MDTFlash Flood WarningCYSDawes, Sioux5 hr
May 16, 12:57 AM MDTFlash Flood WarningCYSDawes, Sioux2 hr
May 16, 2:43 PM MDTFlash Flood WarningCYSDawes, Sioux3 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 1991Every severe thunderstorm warning in 1991

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.