Area Forecast Discussion
Issued by NWS Cheyenne, WY

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000
FXUS65 KCYS 311713
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
1113 AM MDT MON AUG 31 2015

.SHORT TERM...(TODAY THROUGH WEDNESDAY NIGHT)
ISSUED AT 431 AM MDT MON AUG 31 2015

SCATTERED SHOWERS WILL CONTINUE EARLY THIS MORNING AHEAD OF A
SHORTWAVE MOVING UP FROM THE SOUTHWEST WITHIN THE RIGHT ENTRANCE
REGION OF AN UPPER LEVEL JET MAX. A FEW LIGHTNING STRIKES HAVE BEEN
OBSERVED OVER NORTHWEST COLORADO THE PAST FEW HOURS...SO CANT
RULE OUT AN ISOLATED STORM OVER THE SOUTHERN WYOMING MOUNTAINS AS
WELL. THE COLD FRONT LOOKS TO BE DRAPED ACROSS NORTHERN WYOMING
ACCORDING TO 4AM SFC OBS AND SHOULD BEGIN TO MOVE ACROSS OUR
EASTERN COUNTIES AROUND SUNRISE. AHEAD OF THE FRONT...SOUTHWEST
WINDS HAVE BECOME QUITE BREEZY OVERNIGHT WITH GUSTS ON AVERAGE OF
25 TO 35 MPH...WITH A FEW SPOTS ALONG AND WEST OF THE LARAMIE
RANGE REPORTING HIGHER SPEEDS. WILL SEE THESE WINDS PERSIST
THROUGH THE MORNING AS THE FRONT SLIDES SOUTH ACROSS THE
PLAINS...AND WINDS BEHIND THE FRONT WILL VEER TO THE NORTH
REMAINING GUSTY AT TIMES.

TEMPS WILL BE COOLER TODAY IN THE POST FRONTAL AIRMASS WITH
READINGS EXPECTED TO REMAIN IN THE 70S AND 80S. AS THE SFC HIGH
DROPS INTO THE CENTRAL PLAINS...SFC WINDS WILL VEER FURTHER TO A
SOUTHEASTERLY UPSLOPE COMPONENT THROUGH THE AFTERNOON. UPPER LEVEL
FLOW WILL REMAIN OUT OF THE SOUTHWEST WITH A CONTINUED STREAM OF
SUBTROPICAL MOISTURE...SO MAINTAINED A CHANCE FOR SHOWERS AND
TSTMS THIS AFTERNOON OVER THE MOUNTAINS BUT ALSO EXPANDED SLIGHT
CHANCES EASTWARD WITHIN THE UPSLOPE REGIME...ALTHO COVERAGE IN
THIS AREA WILL REMAIN VERY ISOLATED. ALTHO LLVL MOISTURE WILL BE
HIGHER THAN YESTERDAY...GUSTY WINDS ARE STILL A GOOD BET WITH THIS
ACTIVITY.

TUESDAY WILL BE WARMER AS THE COLDER AIRMASS RETREATS TO THE EAST
AND ANOTHER SHORTWAVE EMBEDDED IN SOUTHWEST FLOW LOOKS TO MOVE
OVERHEAD BRINGING ADDITIONAL CHANCES FOR AFTERNOON SHOWERS AND
TSTMS BUT MAINLY TO THE MOUNTAINS. A STRONG UPPER LOW WILL DIG
INTO THE PAC NW ON WEDNESDAY AND SHOULD DEEPEN THE LEESIDE
PRESSURE TROUGH THRU WEDNESDAY MORNING/AFTERNOON. SFC WINDS WILL
INCREASE IN RESPONSE WITH GUSTS OF 30 TO 35 MPH POSSIBLE THRU THE
AFTERNOON OUT WEST AS 700-500 MBS WILL RAMP UP TO 25 TO 35 KTS. A
SOMEWHAT DRIER AIRMASS WILL MOVE IN FOR WEDNESDAY WHILE TEMPS
CONTINUE TO WARM UNDER AMPLIFIED SOUTHWEST FLOW. PRECIP CHANCES
WILL BE LESS OVERALL BUT CANT RULE OUT A TSTM OR TWO OVER THE
MOUNTAINS.

.LONG TERM...(THURSDAY THROUGH SUNDAY)
ISSUED AT 431 AM MDT MON AUG 31 2015

THURSDAY...DRY AND MILD DAY UNDER SOUTHWEST FLOW ALOFT AND WITH
LIMITED LOW AND MID LEVEL MOISTURE TO FUEL THUNDERSTORMS.

FRIDAY...FLOW ALOFT REMAINS SOUTHWEST. HOWEVER...WITH AN INCREASE IN
LOW AND MID LEVEL MOISTURE AND LOW LEVEL UPSLOPE WINDS...EXPECT
ISOLATED LATE DAY SHOWERS AND THUNDERSTORMS MAINLY ALONG AND EAST OF
THE LARAMIE RANGE.

SATURDAY...NEXT MORE POTENT SHORTWAVE TROUGH ALOFT MOVES ACROSS
MONTANA. EXPECT ISOLATED LATE DAY THUNDERSTORMS TO DEVELOP IN OUR
COUNTIES ALONG A CONVERGENCE BOUNDARY.

SUNDAY...MOSTLY DRY DAY IN THE WAKE OF A COLD FRONT AS DRIER AND
MORE STABLE AIRMASS MOVES IN.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY MORNING)
ISSUED AT 1113 AM MDT MON AUG 31 2015

VFR EXPECTED THROUGH THE PERIOD. A FEW AFTERNOON AND EVENING SHOWERS
AND THUNDERSTORMS POSSIBLE MAINLY AROUND THE SRN WY MTNS THIS
AFTERNOON WITH BRIEF LOCALIZED MVFR AND GUSTY AND ERRATIC WIND.

&&

.FIRE WEATHER...
ISSUED AT 431 AM MDT MON AUG 31 2015

WIDELY SCATTERED LIGHT RAIN SHOWERS WILL CONTINUE TO MOVE NORTHEAST
ACROSS THE DISTRICT THIS MORNING. BREEZY SOUTHWEST WINDS OF 25 TO 35
MPH WITH A FEW HIGHER GUSTS WILL ALSO PERSIST AHEAD OF A COLD FRONT
THAT WILL DROP SOUTH ACROSS THE EASTERN PLAINS AFTER SUNRISE.
WINDS ACROSS THE PLAINS BEHIND THE FRONT WILL SWITCH TO THE NORTH
WITH GUSTS TO 25 MPH...THEN WILL VEER TO THE SOUTHEAST THROUGH THE
AFTERNOON. A FEW SHOWERS AND TSTORMS WILL RETURN TO THE MOUNTAINS AND
NEARBY EASTERN PLAINS THIS AFTERNOON AS ENERGETIC SUBTROPICAL FLOW
REMAINS OVERHEAD. COOLER TEMPS TODAY WILL BE SHORT-LIVED WITH VERY
WARM...DRY AND BREEZY CONDITIONS LOOKING TO RETURN TO SOUTHEAST
WYOMING THROUGH THE END OF THE WEEK.

&&

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

$$

SHORT TERM...RJM
LONG TERM...RUBIN
AVIATION...RE
FIRE WEATHER...RJM


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