Alert archive / Wyoming / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 23, NWS Cheyenne, WY

May 10, 1998Goshen County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 10, 1998, 6:40 PM MDT for Goshen County, Wyoming. It was in force for 60 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 10, 1998, 6:40 PM MDT (00:40 UTC)
Expired
May 10, 1998, 7:40 PM MDT
In force
60 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Goshen County, WY

The radar

The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 00:57 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 10, 3:15 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.7 hours before the alert went out and 251 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, Rapid City, SD at 00:00Z on 1998-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 1998-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1277 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
149 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.

000 
TTAA00 KCYS 110040 RRA
SVRCYS
WYC015-110040-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
640 PM MDT SUN MAY 10 1998

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

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

* UNTIL 740 PM MDT

* AT 640 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF LAGRANGE OVER HIGHWAY
  85.  MOVEMENT WAS NORTHEAST AT 5 TO 10 MPH.  THIS STORM IS LIKELY
  PRODUCING HAIL IN EXCESS OF 1 INCH IN DIAMETER AND EXTREMELY HEAVY
  RAINFALL.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LAGRANGE THROUGH 715 PM

THIS IS A DANGEROUS STORMX! STAY INDOORS AWAY FROM WINDOWS.
THIS STORM WILL ALSO PRODUCE MINOR FLOODING OF HIGHWAY 85.

WCJIN-WYSE

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 10, 3:29 PM MDT, 3 hours 11 minutes before
WYZ059-060-067>070-NEZ001>003-019>021-054-055-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
329 PM MDT SUN MAY 10 1998

...S SEVERE THUNDERSTORM WATCH FOR THE NEBRASKA PANHANDLE AND MUCH OF
SOUTHEAST WYOMING IS IN EFFECT UNTIL 9 PM...

THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR
THE NEBRASKA PANHANDLE AND MUCH OF SOUTHEAST WYOMING UNTIL 9 PM.  THIS
WATCH INCLUDES THE CITIES OF LUSK...DOUGLAS...WHEATLAND...TORRINGTON...
SCOTTS BLUFF...GERING...CHADRON...ALLIANCE...SIDNEY AND KIMBALL.

AY 320 PM...SEVERE THUNDERSTORMS WERE LOCATED FROM 26 MILES SOUTH OF
TORRINGTON TO 5 MILES NORTHEAST OF SCOTTSBLUFF.  THESE STORMS WERE
MOVING TO THE EAST AT 20 MPH.  AT 2 PM...GOLF BALL SIZED HAIL FELL
ABOUT 20 MILES NORTH OF CHEYENNE AS WELL AS 2 FUNNEL CLOUDS.  IN
ADDTION...ONE HALF INCH DIAMETER HAIL FELL AT 3 PM IN SOUTHWEST GOSHEN
COUNTY.
<
LARGE HAIL...STRONG WINDS IN EXCESS OF 50 MPH AND VERY HEAVY RAINFALL
WILL BE ASSOCIATED WITH THE STORMS IN THE WATCH AREA THROUGH THE
EVENING.  SO FAR THIS AFTERNOON...DOPPLER RADAR HAS INDICATED RAINFALL
AMOUNTS OF UP TO AN INCH PER HOUR.  THESE HEAVY RAIN MAY PRODUCE
URBAN AND LOW LAND FLOODING.

A WATCH MEANS THAT WEATHER CONDITIONS ARE FAVORABLE FOR THE
FORMATION OF SEVERE THUNDERSTORMS IN AND NEAR THAT AREA.  STEPS SHOULD
BE TAKEN NOW TO FIND THE SAFEST AREA IN YOUR LOCATION.

PEOPLE IN SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE SHOULD BE ALERT
TO THE APPROACH OF ANY THUNDERSTORMS.  IF A STORM APPROACHES MOVE TO
YOUR SAFE SHELTER.

WCJIN-WYSE-WYNE
WEILAND
Special weather statement, May 10, 3:29 PM MDT, 3 hours 11 minutes before
WYZ059-060-067>070-NEZ001>003-019>021-054-055-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
329 PM MDT SUN MAY 10 1998

...S SEVERE THUNDERSTORM WATCH FOR THE NEBRASKA PANHANDLE AND MUCH OF
SOUTHEAST WYOMING IS IN EFFECT UNTIL 9 PM...

THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR
THE NEBRASKA PANHANDLE AND MUCH OF SOUTHEAST WYOMING UNTIL 9 PM.  THIS
WATCH INCLUDES THE CITIES OF LUSK...DOUGLAS...WHEATLAND...TORRINGTON...
SCOTTS BLUFF...GERING...CHADRON...ALLIANCE...SIDNEY AND KIMBALL.

AY 320 PM...SEVERE THUNDERSTORMS WERE LOCATED FROM 26 MILES SOUTH OF
TORRINGTON TO 5 MILES NORTHEAST OF SCOTTSBLUFF.  THESE STORMS WERE
MOVING TO THE EAST AT 20 MPH.  AT 2 PM...GOLF BALL SIZED HAIL FELL
ABOUT 20 MILES NORTH OF CHEYENNE AS WELL AS 2 FUNNEL CLOUDS.  IN
ADDTION...ONE HALF INCH DIAMETER HAIL FELL AT 3 PM IN SOUTHWEST GOSHEN
COUNTY.
<
LARGE HAIL...STRONG WINDS IN EXCESS OF 50 MPH AND VERY HEAVY RAINFALL
WILL BE ASSOCIATED WITH THE STORMS IN THE WATCH AREA THROUGH THE
EVENING.  SO FAR THIS AFTERNOON...DOPPLER RADAR HAS INDICATED RAINFALL
AMOUNTS OF UP TO AN INCH PER HOUR.  THESE HEAVY RAIN MAY PRODUCE
URBAN AND LOW LAND FLOODING.

A WATCH MEANS THAT WEATHER CONDITIONS ARE FAVORABLE FOR THE
FORMATION OF SEVERE THUNDERSTORMS IN AND NEAR THAT AREA.  STEPS SHOULD
BE TAKEN NOW TO FIND THE SAFEST AREA IN YOUR LOCATION.

PEOPLE IN SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE SHOULD BE ALERT
TO THE APPROACH OF ANY THUNDERSTORMS.  IF A STORM APPROACHES MOVE TO
YOUR SAFE SHELTER.

WCJIN-WYSE-WYNE
WEILAND
Special weather statement, May 10, 5:32 PM MDT, 1 hour 8 minutes before
NEZ019-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
532 PM MDT SUN MAY 10 1998

...A SEVERE THUNDERSTORM WATCH REMAINS POSTED FOR ALL OF THE NEBRASKA
PANHANDLE UNTIL 9 PM...

AT 530 PM...A THUNDERSTORM WITH HEAVY RAIN AND SMALL HAIL WAS LOCATED
JUST SOUTH OF GERING.   THIS STORM WAS MOVING NORTH NORTHEAST AT 15 MPH
AND WILL IMPACT GERING THROUGH 550 PM.  THIS STORM WILL MOVE VERY CLOSE
TO SCOTTSBLUFF BY 545 PM.

IF YOU ARE IN THE PATH OF THIS STORM...TAKE SHELTER AND STAY AWAY FROM
WINDOWS.

DMM
Special weather statement, May 10, 5:32 PM MDT, 1 hour 8 minutes before
NEZ019-110000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
532 PM MDT SUN MAY 10 1998

...A SEVERE THUNDERSTORM WATCH REMAINS POSTED FOR ALL OF THE NEBRASKA
PANHANDLE UNTIL 9 PM...

AT 530 PM...A THUNDERSTORM WITH HEAVY RAIN AND SMALL HAIL WAS LOCATED
JUST SOUTH OF GERING.   THIS STORM WAS MOVING NORTH NORTHEAST AT 15 MPH
AND WILL IMPACT GERING THROUGH 550 PM.  THIS STORM WILL MOVE VERY CLOSE
TO SCOTTSBLUFF BY 545 PM.

IF YOU ARE IN THE PATH OF THIS STORM...TAKE SHELTER AND STAY AWAY FROM
WINDOWS.

DMM

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 6:06 PM MDTSevere Thunderstorm WarningCYSLaramie39 min
May 10, 6:44 PM MDTSevere Thunderstorm WarningCYSLaramie61 min
May 10, 9:26 PM MDTSevere Thunderstorm WarningCYSLaramie34 min
May 10, 9:57 PM MDTSevere Thunderstorm WarningCYSLaramie48 min
May 11, 5:18 AM MDTSevere Thunderstorm WarningCYSAlbany32 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.