Severe Thunderstorm Warning 50, NWS Cheyenne, WY

SOUTHEAST WYOMING/NEBRASKA PANHANDLE AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
300 PM MDT SUN JUN 20 1999

LAPS SHOWS CAPES OF 3000 PLUS J/KG AND NEG LI OF -8 ALG ERN WY BORDER
INTO WRN PTNS OF SD AND NEBRASKA.  TSTMS THAT HAVE DVLPD OVER PARTS
OF CNTRL AND SRN WY HAVE BEEN RELATIVELY WK.  VERY LTL ACTIVITY THUS
FAR FROM NERN WY THRU PNHNDL.  WITH LTL IN THE WAY OF UPR DYNAMICS IN
CWA...WILL GO WITH 20 PERCENT POPS...30 IN MTNS FOR THIS EVENING.

MON LOOKS NOT UNLIKE TDA...ALTHOUGH BEST INSTABILITY IS PRGD TO SHIFT
FURTHER E INTO NRN PLNS ESPECIALLY BY AVN/NGM.  THINK ETA MAY BE
BETTER IN KEEPING SOME INSTABILITY ARND IN CWA...BUT 10-20 PERCENT
POPS SHOULD BE ENOUGH MON AFTN.

STGR SHRTWV TROF WILL SWEEP THRU NRN RCKYS MON NIGHT AND TUE...ALG
WITH AN ASSOCD PAC CDFNT WHICH MOVES THRU CWA MON NIGHT/TUE MRNG.
THIS WILL BRING POPS BACK TO SCT CATEGORY FOR LATER PDS ALTHOUGH
UPR DYNAMICS WILL START SHIFTING E OF CWA LATER TUE AFTN.

FAN TEMPS CONT TO LOOK A LTL TOO WARM...PREFER SLGTLY COOLER FWC.

.CYS...
WY...NONE.
NE...NONE.

JLH