Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 30, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at May 19, 1998, 2:59 PM MDT for Laramie County, Wyoming. It was in force for 46 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
- May 19, 1998, 2:59 PM MDT (20:59 UTC)
- Expired
- May 19, 1998, 3:45 PM MDT
- In force
- 46 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 21:01 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 12:00Z, 9.0 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3220 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
423 WUUS1 KCYS 192058 RRA SVRCYS WYC021-192145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 259 PM MDT TUE MAY 19 1998 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN LARAMIE COUNTY IN SOUTHEASTERN WYOMING * UNTIL 345 PM MDT * AT 255 PM...SPOTTERS INDICATED A SEVERE THUNDERSTORM 20 MILES NORTH OF CHEYENNE...JUST EAST OF I-25. MOVMENT WAS EAST AT 15 MPH. THIS STORM WAS PRODUCING GOLF BALL SIZED HAIL. * THE SEVERE THUNDERSTORM WILL BE NEAR... IN OPEN COUNTRY THIS IS A DANGEROUS STORM STAY INDOORS AWAY FROM WINDOWS. & DMM
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, May 19, 9:45 AM MDT, 5 hours 14 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-200000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 945 AM MDT TUE MAY 19 1998 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS MODERATE TODAY EAST OF THE LARAMIE MOUNTAIN RANGE AND LOW WEST OF IT. SPOTTER ACTIVATION WILL LIKELY BE REQUIRED FROM CONVERSE...PLATTE AND LARAMIE COUNTIES OF WYOMING EAST THROUGH THE WESTERN NEBRASKA PANHANDLE. DISCUSSION...THE AIRMASS OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON WILL BE AS WARM AS MONDAY AND ALOT MORE MOIST. THE ATMOSPHERE IS EXPECTED TO AT LEAST BECOME MODERATELY UNSTABLE BY MID AFTERNOON EAST OF THE LARAMIE MOUNTAINS IN WYOMING THROUGH THE WESTERN NEBRASKA PANHANDLE. AN UPPER LEVEL DISTURBANCE... FORECAST TO BE ALONG THE WYOMING/NEBRASKA BORDER LATE IN THE AFTERNOON ...WILL CONTRIBUTE TO THE STRENGTH OF THE THUNDERSTORMS. THE STORMS WILL BE ABLE TO PRODUCE BRIEF HEAVY RAIN...STRONG WINDS AND HAIL POSSIBLY UP TO THREE QUARTER INCH DIAMETER. < WEST OF THE LARAMIE MOUNTAINS...IN CARBON AND ALBANY COUNTIES...THE MAIN THREAT REMAINS STRONG WIND GUSTS WITH ANY THUNDERSTORMS. WCJIN-WYNE-WYSE COX
Special weather statement, May 19, 9:45 AM MDT, 5 hours 14 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-200000- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 945 AM MDT TUE MAY 19 1998 THE SEVERE WEATHER POTENTIAL IN THE CHEYENNE NWS COUNTY WARNING AREA IS MODERATE TODAY EAST OF THE LARAMIE MOUNTAIN RANGE AND LOW WEST OF IT. SPOTTER ACTIVATION WILL LIKELY BE REQUIRED FROM CONVERSE...PLATTE AND LARAMIE COUNTIES OF WYOMING EAST THROUGH THE WESTERN NEBRASKA PANHANDLE. DISCUSSION...THE AIRMASS OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE THIS AFTERNOON WILL BE AS WARM AS MONDAY AND ALOT MORE MOIST. THE ATMOSPHERE IS EXPECTED TO AT LEAST BECOME MODERATELY UNSTABLE BY MID AFTERNOON EAST OF THE LARAMIE MOUNTAINS IN WYOMING THROUGH THE WESTERN NEBRASKA PANHANDLE. AN UPPER LEVEL DISTURBANCE... FORECAST TO BE ALONG THE WYOMING/NEBRASKA BORDER LATE IN THE AFTERNOON ...WILL CONTRIBUTE TO THE STRENGTH OF THE THUNDERSTORMS. THE STORMS WILL BE ABLE TO PRODUCE BRIEF HEAVY RAIN...STRONG WINDS AND HAIL POSSIBLY UP TO THREE QUARTER INCH DIAMETER. < WEST OF THE LARAMIE MOUNTAINS...IN CARBON AND ALBANY COUNTIES...THE MAIN THREAT REMAINS STRONG WIND GUSTS WITH ANY THUNDERSTORMS. WCJIN-WYNE-WYSE COX
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 4:01 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 34 min |
| May 19, 4:57 PM MDT | Severe Thunderstorm Warning | CYS | Niobrara | 33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.