Alert archive / Nebraska / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 93, NWS North Platte, NE

September 12, 1991Antelope County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Sep 12, 1991, 6:24 PM CDT for Antelope County, Nebraska. It was in force for 46 min.

The area

The counties it named.

The facts

Issued
Sep 12, 1991, 6:24 PM CDT (23:24 UTC)
Expired
Sep 12, 1991, 7:10 PM CDT
In force
46 min
Issued by
NWS North Platte, NE
Area
Whole counties

County Antelope County, NE

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.4 hours before the alert went out and 240 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, N. Platte/Lee Bi, NE at 12:00Z on 1991-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 264 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, N. Platte/Lee Bi, NE at 12:00Z on 1991-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.193958Sfc1 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
264 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
915 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.5

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, Sep 12, 6:09 PM CDT, 15 minutes before
NEZ012-130030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
610 PM CDT THU SEP 12 1991

...STRONG THUNDERSTORMS IN WEST CENTRAL NEBRASKA...

STRONG THUNDERSTORMS WERE LOCATED JUST iEAST OF THE NORTH PLATTE
AREA AND SHOULD BE MOVING NORTHEAST AT AROUND 20 MPH.

THESE STORMS COULD PRODUCE HEAVY RAIN..STRONG WINDS AND HAIL
AS THEY MOVE NORTHEAST THROUGH LINCOLN COUNTY BETWEEN 6 PM AND
8PM CDT.

RC

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 12, 7:50 AM CDTTornado WarningLBFGarfield25 min
Sep 12, 8:12 AM CDTSevere Thunderstorm WarningLBFWheeler33 min
Sep 12, 4:35 PM CDTSevere Thunderstorm WarningLBFGarfield55 min
Sep 12, 6:24 PM CDTSevere Thunderstorm WarningLBFBoone66 min

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.