Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 99, NWS Cheyenne, WY

August 13, 1997Cheyenne County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 13, 1997, 7:25 PM MDT for Cheyenne County, Nebraska. It was in force for 35 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 13, 1997, 7:25 PM MDT (01:25 UTC)
Expired
Aug 13, 1997, 8:00 PM MDT
In force
35 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 152 km from the middle of the area, began a volume at 01:25 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 00:00Z, 1.4 hours before the alert went out and 151 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 00:00Z on 1997-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 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, Denver, CO at 00:00Z on 1997-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.1939587897Sfc1 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
17 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
2986 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
41 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 140128 RRA
SVRCYS
NEC033-140155-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
725 PM MDT WED AUG 13 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN CHEYENNE COUNTY IN WESTERN NEBRASKA PANHANDLE

* UNTIL 800 PM MDT

* SOME LOCATIONS AFFECTED
  SOUTHERN SIDNEY                     NOW
  MAINLY RURAL AREAS

* AT 721 PM MDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 3 MILES SOUTHWEST OF SIDNEY MOVING EAST AT 25 MPH.

THIS STORM IS CAPABLE OF PRODUCING LARGE HAIL IN EXCESS OF 3/4 INCH
IN DIAMETER AND DAMAGING WINDS IN EXCESS OF 60 MPH.
 
 
STRONG WINDS WITH THIS STORM MAY CAUSE INJURY OR DAMAGE.  TAKE SHELTER
INSIDE A STURDY BUI
LDING AWAY FROM ALL DOORS AND WINDOWS.

LRE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 6:12 PM MDTSevere Thunderstorm WarningCYSBanner43 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.