Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 83, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 30, 1998, 10:44 PM MDT for Laramie County, Wyoming. It was in force for 51 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
- Jun 30, 1998, 10:44 PM MDT (04:44 UTC)
- Expired
- Jun 30, 1998, 11:35 PM MDT
- In force
- 51 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 04:48 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 |
|---|---|---|---|
| Jun 30, 10:55 PM MDT | Thunderstorm Wind 52 | Cheyenne, WY | A storm produced wind gusts up to 60 mph, 20 miles northeast of Cheyenne. |
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 00:00Z, 4.7 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.
- Mixed-layer CAPE
- 442 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 2139 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- -24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 010444 RRA SVRCYS WYC021-010535- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 1044 PM MDT TUE JUN 30 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTH CENTRAL AND NORTHEASTERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 1135 PM MDT * AT 1037 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 20 TO 25 MILES NORTH OF CHEYENNE... MOVING EAST AT 25 MPH. THIS STORM LIKELY HAS WIND GUSTS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... THIS STORM WILL REMAIN OVER OPEN COUNTRY. THIS IS A DANGEROUS STORM! STAY INDOORS AWAY FROM WINDOWS. WCJIN-WYSE JAD
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jun 30, 9:24 PM MDT, 1 hour 20 minutes before
WYZ065-066-010400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 924 PM MDT TUE JUN 30 1998 ...A STRONG THUNDERSTORM WAS MOVING THROUGH EAST CENTRAL ALBANY COUNTY AT 920 PM... THE STORM WAS LOCATED ABOUT 15 MILES NORTH OF LARAMIE...OR JUST EAST OF BOSLER. IT WAS MOVING SOUTHEAST AT 25 MPH AND WILL STAY EAST OF HIGHWAY 30 AND MISS LARAMIE. THIS STORM WAS LIKELY PRODUCING HEAVY RAIN AND SMALL HAIL...ALONG WITH GUSTY WINDS TO &50 MPH. PEOPLE IN EAST CENTRAL ALBANY COUNTY SHOULD REMAIN INDOORS UNTIL THIS STORM PASSES ON BY. WCJIN-WYSE JAD
Special weather statement, Jun 30, 9:24 PM MDT, 1 hour 20 minutes before
WYZ065-066-010400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 924 PM MDT TUE JUN 30 1998 ...A STRONG THUNDERSTORM WAS MOVING THROUGH EAST CENTRAL ALBANY COUNTY AT 920 PM... THE STORM WAS LOCATED ABOUT 15 MILES NORTH OF LARAMIE...OR JUST EAST OF BOSLER. IT WAS MOVING SOUTHEAST AT 25 MPH AND WILL STAY EAST OF HIGHWAY 30 AND MISS LARAMIE. THIS STORM WAS LIKELY PRODUCING HEAVY RAIN AND SMALL HAIL...ALONG WITH GUSTY WINDS TO &50 MPH. PEOPLE IN EAST CENTRAL ALBANY COUNTY SHOULD REMAIN INDOORS UNTIL THIS STORM PASSES ON BY. WCJIN-WYSE JAD
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 11:17 PM MDT | Severe Thunderstorm Warning | CYS | Laramie | 53 min |
| Jun 30, 11:38 PM MDT | Tornado Warning | CYS | Laramie | 32 min |
Nearby
Severe Thunderstorm Warnings in Wyoming, 1998Every 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.