Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 103, NWS Cheyenne, WY

August 18, 1997Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 18, 1997, 5:01 PM MDT for Morrill County, Nebraska. It was in force for 44 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
Aug 18, 1997, 5:01 PM MDT (23:01 UTC)
Expired
Aug 18, 1997, 5:45 PM MDT
In force
44 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Morrill County, NE

The radar

The Cheyenne radar (KCYS), 162 km from the middle of the area, began a volume at 23:04 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 nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.0 hours before the alert went out and 206 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, Denver, CO at 12:00Z on 1997-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 38 joules per kilogram.LCLLFCEL10008507005003002001001 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, Denver, CO at 12:00Z on 1997-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
38 J/kg
Mixed-layer CIN
-318 J/kg
Mixed-layer LCL
1472 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KCYS 182304 RRA
SVRCYS
NEC123-182350-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
501 PM MDT MON AUG 18 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTH CENTRAL MORRILL COUNTY IN WESTERN NEBRASKA PANHANDLE

* UNTIL 545 PM MDT

* THIS STORM IS EXPECTED TO REMAIN IN RURAL AREAS.

* AT 458 PM MDT...HAIL UP TO GOLFBALL SIZE WAS REPORTED 15 MILES 
  SOUTH OF BRIDGEPORT.  THIS STORM WAS MOVING TO THE EAST AT 10 MPH. 

 LARGE HAIL IS LIKELY WITH THIS STORM.  SEEK SHELTER INSIDE A STURDY
  BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES.

&

WEILAND

Nearby

Severe Thunderstorm Warnings in Nebraska, 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.