Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 94, NWS Cheyenne, WY

July 2, 1998Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 2, 1998, 4:54 PM MDT for Laramie County, Wyoming. It was in force for 41 min. 3 reports 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: Jul 2, 1998, 4:54 PM MDT (22:54 UTC)
Expired: Jul 2, 1998, 5:35 PM MDT
In force: 41 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 20 km from the middle of the area, began a volume at 22:55 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.

What was reported inside it

Time	Report	Where	Remark
Jul 2, 5:25 PM MDT	Hail 1	Cheyenne, WY	A storm produced quarter size hail 9 miles south of Cheyenne.
Jul 2, 5:35 PM MDT	Hail 1	Cheyenne, WY	Spotters reported quarter size hail on the Terry Bison Ranch 10 miles southwest of Cheyenne.
Jul 2, 5:38 PM MDT	Hail 1	Cheyenne, WY	A storm produced quarter size hail 9 miles south of Cheyenne. The hail covered the ground and wind driven hail broke some automobile windshields.

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

Denver, CO (KDNR), launched 12:00Z, 10.9 hours before the alert went out and 202 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: 56 J/kg
Mixed-layer CIN: -473 J/kg
Mixed-layer LCL: 2148 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 66 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.

033 
WUUS1 KCYS 022253 RRA
SVRCYS
WYC021-022340-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
454 PM MDT THU JUL 2 1998

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING

* UNTIL 535 PM MDT

* AT 450 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 12 MILES WEST OF CHEYENNE... MOVING EAST AT 15
  MPH.  A SECOND SEVERE STORM WAS LOCATED 18 MILES WEST OF
  CHEYENNE...JUST SOUTH OF INTERSTATE 80.

* A SEVERE THUNDERSTORM WILL BE NEAR...
  CHEYENNE BY 525 PM

THIS WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY IN
EFFECT FOR SOUTHWEST LARAMIE COUNTY.

LARGE HAIL IS LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM
WINDOWS

WCJIN-WYSE
ROBINSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 7:10 PM MDT	Severe Thunderstorm Warning	CYS	Converse	60 min
Jul 1, 7:59 PM MDT	Tornado Warning	CYS	Converse	31 min
Jul 1, 8:30 PM MDT	Severe Thunderstorm Warning	CYS	Converse	60 min
Jul 1, 9:22 PM MDT	Flash Flood Warning	CYS	Converse	6 hr
Jul 1, 9:33 PM MDT	Severe Thunderstorm Warning	CYS	Converse	47 min
Jul 1, 10:01 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	44 min
Jul 2, 3:47 PM MDT	Tornado Warning	CYS	Albany	28 min
Jul 2, 3:53 PM MDT	Severe Thunderstorm Warning	CYS	Albany	47 min
Jul 2, 4:35 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	45 min
Jul 2, 5:31 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	49 min
Jul 2, 5:51 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	49 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 1998 Every severe thunderstorm warning in 1998

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; radar from the NEXRAD Level II archive.