Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 104, NWS Cheyenne, WY

August 18, 1997Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 18, 1997, 7:51 PM MDT for Dawes County, Nebraska. It was in force for 34 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, 7:51 PM MDT (01:51 UTC)
Expired
Aug 18, 1997, 8:25 PM MDT
In force
34 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 158 km from the middle of the area, began a volume at 01:50 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

Rapid City, SD (KUNR), launched 00:00Z, 1.9 hours before the alert went out and 152 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 1997-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1141 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, Rapid City, SD at 00:00Z on 1997-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
1141 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
1321 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCYS 190152 RRA
SVRCYS
NEC045-190225-

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

* SEVERE THUNDERSTORM WARNING FOR
  NORTHERN DAWES COUNTY IN NORTHWESTERN NEBRASKA PANHANDLE

* UNTIL 825 PM MDT

* SOME LOCATIONS AFFECTED
  CHADRON                              BY 805 PM MDT
  CHADRON STATE PARK                   BY 810 PM MDT

* AT 749 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 12 MILES WEST OF CHADRON MOVING EAST AT 30 MPH.
 
 
LARGE HAIL IS LIKELY WITH THIS STORM.  SEEK SHELTER INSIDE A STURDY
BUILDING AWAY FROM ALL WINDOWS UNTIL THE STORM PASSES.

JLH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 4:42 PM MDTSevere Thunderstorm WarningCYSKimball48 min

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.