Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 281741
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
1141 AM MDT TUE APR 28 2015

.SHORT TERM...(TODAY THROUGH THURSDAY)
ISSUED AT 251 AM MDT TUE APR 28 2015

FOG HAS PRETTY MUCH HELD OFF OVER THE CWA AS OF EARLY THIS MORNING
AND DENSE FOG FORMATION LOOKING LESS LIKELY OR WIDESPREAD. HAVE
OPTED TO CANCEL THE DENSE FOG ADVY GIVEN THESE TRENDS THOUGH
PATCHY AREAS STILL POSSIBLE OVER THE NEXT FEW HOURS UNTIL SHORTLY
AFTER SUNRISE.

BEYOND THAT DRY AND WARMER WEATHER WILL RETURN TO THE CWA TODAY
THROUGH WEDS AS AN UPPER RIDGE MOVES SLOWLY ACROSS THE REGION.
SKIES SHOULD CLEAR OUT GRADUALLY THIS MORNING AND AFTERNOON AS
SUBSIDENT FLOW OCCURS IN THE LOWER LEVELS OF THE ATMOSPHERE WITH
MAINLY CLEAR SKIES TONIGHT THROUGH WEDS NIGHT.

AN UPPER SHORTWAVE WILL MOVE ACROSS THE NORTHERN ROCKIES INTO THE
NORTHERN PLAINS THURSDAY. THIS WILL PUSH A COOL FRONT ACROSS THE
CWA EARLY THURSDAY BRINGING ABOUT 5-10 DEGREES OF COOLING. UPSLOPE
FLOW BEHIND THE FRONT ALONG WITH SOME INSTABILITY SHOULD ALLOW FOR
SCTD SHOWERS AND A FEW TSTRMS TO FORM IN THE AFTERNOON OVER SE WY.

.LONG TERM...(THURSDAY NIGHT THROUGH MONDAY)
ISSUED AT 251 AM MDT TUE APR 28 2015

COLD FRONT SET TO MOVE INTO THE AREA FROM THE NORTHWEST THURSDAY
NIGHT INTO FRIDAY WILL KICK OFF SCATTERED SHOWERS AND
THUNDERSTORMS THURSDAY EVENING OUT WEST. FAIRLY QUICK MOVING FRONT
THOUGH WITH NOT A LOT OF COLD AIR ASSOCIATED...SO SNOW SHOULD NOT
BE A PROBLEM. SHOWERS SPREAD EAST ALONG THE I-80 CORRIDOR INTO
FRIDAY MORNING.

BETTER CHANCES FOR SHOWERS AND THUNDERSTORMS SATURDAY NIGHT INTO
SUNDAY AS ANOTHER COLD FRONT MOVES INTO THE AREA. SOME DIFFERENCES
BETWEEN THE GFS AND ECMWF ON THIS FRONT. GFS FURTHER SOUTH WITH
ASSOCIATED PRECIPITATION WHILE THE ECMWF SLOWER AND MORE
WIDESPREAD OVER SOUTHERN WYOMING. OPTED FOR THE ECMWF SOLUTION AND
INCREASED POPS OVER GUIDANCE.

ASSOCIATED UPPER LEVEL SHORTWAVE SLOW TO MOVE OUT OF THE AREA WITH
PRECIP CHANCES CONTINUING INTO MONDAY.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY AFTERNOON)
ISSUED AT 1139 AM MDT TUE APR 28 2015

LOW CLOUDS ARE BEGINNING TO LIFT AND BECOME MORE SCATTERED ACROSS
THE PLAINS. BRIEF MVFR CIGS WILL STILL BE POSSIBLE THROUGH THE
EARLY AFTERNOON...HOWEVER VFR CONDITIONS WILL GENERALLY PREVAIL.
WINDS WILL BE LIGHT THROUGH THE TAF PERIOD.

&&

.FIRE WEATHER...
ISSUED AT 251 AM MDT TUE APR 28 2015

CONCERNS TO REMAIN LOW FOR THE REST OF THE WEEK WITH WEATHER
CONDITIONS EXPECTED TO REMAIN NON-CRITICAL AND FUELS MOISTENED BY
RECENT GOOD RAINS/SNOWS. MAINLY DRY OVER THE NEXT COUPLE DAYS THEN
CHANCES FOR RAIN RETURN THURSDAY ONWARD.

&&

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

$$

SHORT TERM...RE
LONG TERM...GCC
AVIATION...ZF
FIRE WEATHER...RE



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