Severe Thunderstorm Warning 77, NWS Cheyenne, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
131 PM MDT FRI JUL 21 2000

WILL KEEP THE DISCUSSION OF THE EVE TSTM ACTVTY SHORT TO TRY TO PREPARE
FOR SVR WX LTR THIS AFTN AND EVE.  TSTMS HAVE FIRED IN PARTS OF SE
WY ERY THIS AFTN AND WITH THE CURRENT BUOYANCY...AVBL MSTR AND SHEAR
XPCT SOME TO PRODUCE SVR WX IN XTRM SE WY AND THE WRN NEB PNHNDL.  OMEGA
WUD HINT AT SOME LINGERING ACTVTY TIL ARND MDNT...BUT WILL WORD IT
LT EVE IN THE FCST.  WITH THE HI LLM IN ESP THE WRN NEB PNHNDL AND THE
LGT SE WINDS BLV THAT LO CLDS AND FOG WILL AGN DVLP AFT MDNT...AND MAY
XTND INTO FAR SE WY.  THE ETA LOOKED REASONABLE FOR THIS FCST AND IS
FAIRLY SIM TO THE OTR MDLS IN BLDG THE RDG ALFT TO OUR W THRU SUN.  THE
RESULT WILL BE A WARMING...DRYING AND STBLZG TREND THRU THE WKND.
SAT AFTN AND EVE SHUD SEE LESS TSTMS CVRG THAN THIS AFTN AND EVE AS
WELL AS LESS INTS AND BY SUN ONLY ISOLD CVRG IS XPCTD.  TEMPS WILL
GO TO NEAR OR ABV 90 IN THE LWR ELVTNS BY SUN.  MOS TEMPS AND POPS
LOOK CLOSE.

.EXTENDED DISCUSSION...
500 MB RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD ACROSS THE
CENTRAL US IN THE EXTENDED PERIOD WHILE A TROF OF LOW PRESSURE DIGS
ALONG THE NW COAST.  THIS WILL RESULT IN WARM TEMPS FOR THE CWA.
MONSOONAL MOISTURE WILL CONTINUE TO STREAM INTO THE AREA...RESULTING
IN A DAILY CHANCE FOR AFTERNOON THUNDERSTORMS.

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

WEILAND/DAUGHERTY

NEZ001>003-019>021-054-055-WYZ059>070-211900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1046 AM MDT THU JUL 20 2000

SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS AFTERNOON AND THIS
EVENING IN AREAS EAST OF THE LARAMIE RANGE.

DISCUSSION...THE WEATHER PATTERN FOR THIS AFTERNOON AND EVENING OVER
SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE WILL BE SIMILAR
TO THAT OF THURSDAY.  A MOIST SURFACE UPSLOPE WIND FLOW WILL BE IN
PLACE OVER THE AREA...WITH A WEAK UPPER LEVEL DISTURBANCE MOVING
OVER THE ROCKIES THIS AFTERNOON.  THE RESULT WILL BE A STILL MOIST
AND UNSTABLE AIR MASS WITH A GOOD POSSIBILITY OF A SCATTERED COVERAGE
OF SEVERE THUNDERSTORMS DEVELOPING.  THE STORMS WILL FORM IN THE
EARLY AFTERNOON NEAR THE LARAMIE RANGE...EARLIER THAN ON THURSDAY...
AND MOVE TO THE SOUTHEAST AT 30 MPH.  THE MAIN THREAT FROM THE
STORMS WILL BE HAIL OF BETWEEN 1 AND 2 INCHES IN DIAMETER...WIND
GUSTS TO 60 MPH...BRIEF HEAVY RAIN AND DANGEROUS LIGHTNING.

WEILAND
WCJIN-WYSE-WYNE

NEZ001>003-019>021-054-055-WYZ059>070-211900-

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
1110 AM MDT FRI JUL 21 2000

SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS AFTERNOON AND THIS
EVENING IN AREAS EAST OF THE LARAMIE RANGE.

DISCUSSION...THE WEATHER PATTERN FOR THIS AFTERNOON AND EVENING OVER
SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE WILL BE SIMILAR
TO THAT OF THURSDAY.  A MOIST SURFACE UPSLOPE WIND FLOW WILL BE IN
PLACE OVER THE AREA...WITH A WEAK UPPER LEVEL DISTURBANCE MOVING
OVER THE ROCKIES THIS AFTERNOON.  THE RESULT WILL BE A STILL MOIST
AND UNSTABLE AIR MASS WITH A GOOD POSSIBILITY OF A SCATTERED COVERAGE
OF SEVERE THUNDERSTORMS DEVELOPING.  THE STORMS WILL FORM IN THE
EARLY AFTERNOON NEAR THE LARAMIE RANGE...EARLIER THAN ON THURSDAY...
AND MOVE TO THE SOUTHEAST AT 30 MPH.  THE MAIN THREAT FROM THE
STORMS WILL BE HAIL OF BETWEEN 1 AND 2 INCHES IN DIAMETER...WIND
GUSTS TO 60 MPH...BRIEF HEAVY RAIN AND DANGEROUS LIGHTNING.

WEILAND
WCJIN-WYSE-WYNE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
1157 AM MDT FRI JUL 21 2000

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0422 PM    15 E CHUGWATER            WY   1.00 INCH HAIL
07/20/00   PLATTE

GRIFFITH

NEZ001>003-019>021-054-055-WYZ059-060-067-068-070-212230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
216 PM MDT FRI JUL 21 2000

...A TORNADO WATCH IS IN EFFECT FOR EXTREME EASTERN WYOMING AND THE
WESTERN NEBRASKA PANHANDLE...

AT 210 PM...SHOWERS AND THUNDERSTORMS WERE DEVELOPING OVER EASTERN
WYOMING AND THE WESTERN NEBRASKA PANHANDLE.  THE STORMS ARE
EXPECTED TO CONTINUE DEVELOPING AS THEY MOVE EAST THROUGH THIS
EVENING.  CONDITIONS ARE FAVORABLE FOR LARGE HAIL AND HIGH WINDS FROM
THESE STORMS.  THE SEVERE THUNDERSTORMS COULD ALSO PRODUCE SOME
TORNADOS.

RESIDENTS OF EASTERN WYOMING AND THE NEBRASKA PANHANDLE ARE URGED
TO TAKE PRECAUTIONS AND LISTEN; FOR FURTHER STATEMENTS AND POSSIBLE
WARNINGS.

DAUGHERTY

NEZ001>003-019>021-054-055-WYZ059-060-067-068-070-212230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
216 PM MDT FRI JUL 21 2000

...A TORNADO WATCH IS IN EFFECT FOR EXTREME EASTERN WYOMING AND THE
WESTERN NEBRASKA PANHANDLE UNTIL 9 PM MDT THIS EVENING...

AT 210 PM...SHOWERS AND THUNDERSTORMS WERE DEVELOPING OVER
EASTERN WYOMING AND THE WESTERN NEBRASKA PANHANDLE.  THE STORMS ARE
EXPECTED TO CONTINUE DEVELOPING AS THEY MOVE EAST THROUGH THIS
EVENING.  CONDITIONS ARE FAVORABLE FOR LARGE HAIL AND HIGH WINDS
FROM THESE STORMS.  THE SEVERE THUNDERSTORMS COULD ALSO PRODUCE SOME
TORNADOS.

RESIDENTS OF EASTERN WYOMING AND THE NEBRASKA PANHANDLE ARE \URGED
TO TAKE PRECAUTIONS AND LISTEN FOR FURTHER STATEMENTS AND POSSIBLE
WARNINGS.

DAUGHERTY