Area Forecast Discussion
Issued by NWS Cheyenne, WY

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000
FXUS65 KCYS 292357
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
557 PM MDT WED OCT 29 2014

.SHORT TERM...(THIS EVENING THROUGH FRIDAY NIGHT)
ISSUED AT 250 PM MDT WED OCT 29 2014

HIGH PRESSURE AT THE SURFACE AND ALOFT WILL KEEP CONDITIONS DRY
FOR THE REMAINDER OF THIS AFTERNOON. GUSTY WEST TO SOUTHWEST WINDS
WILL DECREASE AFTER SUNSET. A COLD FRONT TO THE NORTH WILL MOVE
ACROSS SOUTHEAST WYOMING AND WESTERN NEBRASKA TONIGHT WITH A WIND
SHIFT TO THE NORTHWEST. WITH LIMITED LOW/MID LEVEL MOISTURE...THE
FRONTAL PASSAGE WILL BE DRY. HIGH TEMPERATURES THURSDAY WILL BE
5-10 DEGREES COOLER. IT WILL BE BREEZY FOR WESTERN NEBRASKA WITH
GUSTS OF 15-25 MPH. A STRONG RIDGE OF HIGH PRESSURE WILL USHER IN
COOLER AIR FOR THE HIGH PLAINS FRIDAY WITH A EAST-WEST TEMPERATURE
GRADIENT OF LOWER 50S- LOWER 60S...ALONG WITH GUSTY SOUTHEAST
WINDS.

.LONG TERM...(SATURDAY THROUGH WEDNESDAY)
ISSUED AT 250 PM MDT WED OCT 29 2014

WARMEST DAY OF THE PERIOD WILL BE SATURDAY AS THE CWA WILL BE
UNDER SW FLOW ALOFT AHEAD OF A WESTERN CONUS UPPER TROF. NOT OUT
OF THE QUESTION FOR A FEW SHOWERS TO REACH THE FAR WESTERN PART OF
THE CWA LATE IN THE DAY AS SOME ENERGY LIFTS NORTHEAST TOWARDS THE
AREA AHEAD OF THE TROF. BULK OF ENERGY FROM THE UPPER TROF WILL
LIFT NORTHEAST AND OVER THE NRN ROCKYS SAT NIGHT INTO SUNDAY
RESULTING IN A DRIER DOWNSLOPE PATTERN ACROSS THE CWA BEHIND A
PACIFIC FRONT THAT WILL PASS ACROSS SAT NIGHT. BEST CHANCES FOR
PCPN WILL BE OVER THE MTNS SAT NIGHT AND SUNDAY. SOME JET DYNAMICS
MAY COME INTO PLAY OVER THE PLAINS LATE SUNDAY INTO MONDAY AS
REMAINING ENERGY MOVES EAST ACROSS THE CENTRAL ROCKYS AND
OVERRIDES THE COOL AIR MASS AT THE SURFACE. THIS MAY BRING SOME
SHOWERS TO THE PLAINS AT THAT TIME. MAIN TROF AXIS AXIS WILL PASS
ACROSS LATE MONDAY LEAVING MILD AND DRY WEATHER FOR THE CWA
TUESDAY AND WEDNESDAY.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z THURSDAY EVENING)
ISSUED AT 531 PM MDT WED OCT 29 2014

GUSTY WINDS WILL QUICKLY SUBSIDE ACROSS SOUTHEAST WYOMING AND THE
NEBRASKA PANHANDLE EARLY THIS EVENING. IN THE FAVORED WINDY AREAS
SUCH AS NEAR THE SOUTHERN LARAMIE RANGE AND NORTHERN SNOWY RANGE
FOOTHILLS...GUSTS OF 20 TO 30 KTS WILL SLOWLY SUBSIDE THROUGH
TONIGHT. WINDS SHIFTING TO THE NORTH THURSDAY WITH THE PASSAGE OF
A COLD FRONT. VFR THROUGH THE TAF PERIOD.

&&

.FIRE WEATHER...
ISSUED AT 237 PM MDT WED OCT 29 2014

LOW RELATIVE HUMIDITY AND GUSTY WINDS OVER FIRE ZONES 301 AND 310
WILL CREATE NEAR-CRITICAL FIRE WEATHER CONDITIONS THIS AFTERNOON.
A COLD FRONT WILL SWEEP SOUTHEAST ACROSS SOUTHEAST WYOMING AND
WESTERN NEBRASKA TONIGHT. COOLER TEMPERATURES WILL KEEP RELATIVE
HUMIDITY VALUES IN THE 25 TO 35 PERCENT RANGE THURSDAY AFTERNOON...
ALONG WITH LIGHTER WINDS. A REINFORCEMENT OF COOL AIR EAST OF THE
LARAMIE RANGE FRIDAY WILL RAISE HUMIDITY VALUES TO 35 TO 45 PERCENT...
WHILE AREAS TO THE WEST WILL BE DRIER WITH WARMER TEMPERATURES AND
MINIMUM HUMIDITY VALUES FROM 20 TO 30 PERCENT. MILD AND BREEZY
CONDITIONS FRIDAY AND SATURDAY WILL BE FOLLOWED BY COLDER TEMPERATURES
AND CHANCES FOR RAIN AND SNOW SHOWERS SATURDAY NIGHT THROUGH
SUNDAY NIGHT.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.

&&

$$

SHORT TERM...MJ
LONG TERM...RAE
AVIATION...SML
FIRE WEATHER...MJ



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