Alert archive / Wyoming / Tornado Warnings in 1999

Tornado Warning 1, NWS Cheyenne, WY

May 19, 1999Converse County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 19, 1999, 7:22 PM MDT for Converse County, Wyoming. It was in force for 43 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 19, 1999, 7:22 PM MDT (01:22 UTC)
Expired
May 19, 1999, 8:05 PM MDT
In force
43 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Converse County, WY

What was reported inside it

TimeReportWhereRemark
May 19, 7:30 PM MDTHail 1.5Glenrock, 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.

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 1.4 hours before the alert went out and 235 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, Riverton, WY at 00:00Z on 1999-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 61 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, Riverton, WY at 00:00Z on 1999-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
61 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1759 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KCYS 200121 RRA
TORCYS
WYC009-200205-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
722 PM MDT WED MAY 19 1999

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN CONVERSE COUNTY IN EAST CENTRAL WYOMING

* UNTIL 805 PM MDT

* AT 719 PM MDT... SPOTTERS INDICATED A TORNADO 10 MILES WEST OF
  GLENROCK... MOVING EAST AT 20 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  GLENROCK AT 750 PM MDT

A TORNADO IS ON THE GROUND GO TO THE BASEMENT IF A BASEMENT IS NOT
AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

JMR


&

Nearby

Tornado Warnings in Wyoming, 1999Every tornado warning in 1999Tornadoes in 1999

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.