Severe Thunderstorm Warning 191, NWS Rapid City, SD

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
945 AM MDT FRI JUL 21 2000

HAVE UPDATED THE ZONES TO REFLECT ISOLATED NATURE OF SHOWERS
CURRENTLY OVER THE CWA...WITH AN ACTIVITY INCREASING DURING THE
AFTERNOON AND EVENING. TEMPS CURRENTLY LOOK OK. DECENT SHORTWAVE
TROUGH IS VISIBLE IN THE WATER VAPOUR IMAGERY OVER MT AND NORTHERN
WY...AND SHOULD MOVE THROUGH THE CWA THIS AFTERNOON AND EVENING
BRINGING SOME INCREASE IN THE CONVECTIVE ACTIVITY AND SOME SEVERE
WEATHER TO THE AREA. THERE IS NOT A CLEAR FOCUSING MECHANISM FOR THE
CONVECTION TODAY...SO WILL BROADBRUSH THE SWO TO INCLUDE SLIGHT RISK
OF SEVERE OVER MUCH OF THE CWA...WITH HAIL AS THE PRIMARY THREAT.
WIND SHEAR IS GREATER TOWARD THE SOUTH...WITH GREATEST THREAT OF
ROTATING STORMS GENERALLY SOUTH OF RAPID CITY.

.UNR...NONE.

KLIMOWSKI

SDZ001-002-012>014-024>032-041>044-046-047-049-WYZ054>058-212130-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
1000 AM MDT FRI JUL 21 2000

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING...

A WEAK UPPER LEVEL DISTURBANCE WILL INTERACT WITH UNSTABLE AIR OVER
NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA TO CREATE A SLIGHT
RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. THE MAIN
THREAT FROM ANY STORMS THAT BECOME SEVERE WILL BE LARGE HAIL AND
DAMAGING WIND GUSTS.

GR