Alert archive / Wyoming / Tornado Warnings in 1990

Tornado Warning 11, NWS Cheyenne, WY

May 24, 1990Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 24, 1990, 2:00 PM MDT for Platte County, Wyoming. It was in force for 45 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 24, 1990, 2:00 PM MDT (20:00 UTC)
Expired: May 24, 1990, 2:45 PM MDT
In force: 45 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Platte County, WY

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
May 24, 2:30 PM MDT	Hail 1.75	Platte, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 8.0 hours before the alert went out and 274 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 14 J/kg
Mixed-layer CIN: -415 J/kg
Mixed-layer LCL: 1022 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCYS 242001
TORCYS
WYC031-242045-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MDT THU MAY 24 1990
 
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  245 PM MDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHEAST WYOMING
          ...CENTRAL AND NORTHERN PLATTE
 
AT 158 PM MDT RADAR INDICATED A POSSIBLE TORNADO ABOUT 7 MILES
NORTHWEST OF WHEATLAND WYOMING IN CENTRAL PLATTE COUNTY. THE
ASSOCIATED THUNDERSTORM WAS MOVING NORTHEAST AT 10 MILES AN HOUR.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
JLH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 24, 2:35 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	55 min
May 24, 2:50 PM MDT	Tornado Warning	CYS	Laramie	25 min
May 24, 3:18 PM MDT	Tornado Warning	CYS	Goshen, Laramie	42 min
May 24, 4:13 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	62 min
May 24, 4:49 PM MDT	Tornado Warning	CYS	Laramie	56 min
May 24, 5:46 PM MDT	Tornado Warning	CYS	Goshen, Laramie	59 min

Nearby

Tornado Warnings in Wyoming, 1990 Every tornado warning in 1990 Tornadoes in 1990

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.