Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 122056 CCA
AFDCYS

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
255 PM MDT FRI SEP 12 2014

.SHORT TERM...(THIS EVENING THROUGH SUNDAY NIGHT)
ISSUED AT 254 PM MDT FRI SEP 12 2014

MOST OF SOUTHEAST WYOMING EXPERIENCED A KILLING FREEZE LAST NT...
WITH OVERNIGHT LOWS GENERALLY 25-30F. ALTHO NOT IN THE FORESEEABLE
FORECAST...THIS WILL BRING AN END TO FREEZE HIGHLIGHTS FOR THE
SEASON IN THESE AREAS. SATELLITE PIX SHOW CLOUDS IN RETREAT MODE
THIS AFTERNOON AS THE STRONG SUN ANGLE HAS BEEN EFFICIENT IN BL
MIXING. THIS CLEARING TREND WILL CONTINUE THRU THE REMAINDER OF
THE DAY...WITH CLEAR SKIES OVERNIGHT. THE MAIN FORECAST QUESTION
MARK IS THE POSSIBILITY OF FROST OVR PORTIONS OF THE AREA AND
PERHAPS THE NECESSITY OF A FROST ADVISORY. DESPITE SKIES CLEAR
SKIES MAXIMIZING RADIATIONAL COOLING TONIGHT...LATEST MODELS SHOW
SOUTH WINDS WILL STRENGTHEN OVR THE ERN PLAINS. THIS SHOULD
EFFECTIVELY KEEP THE BL MIXED...ESPECIALLY OVR ERN PLAINS
LOCATIONS. SO...FOR NOW WILL SIDE WITH THE WARM SIDE OF GUIDANCE...
WHICH WOULD ONLY SUGGEST PATCHY AREAS OF FROST IN LOWEST
ELEVATIONS.

OTHERWISE...A VERY TYPICAL AUTUMN WEEKEND ON TAP AS DRY NORTHWEST
FLOW ACROSS THE NRN ROCKIES PRODUCES SUN-DRENCHED SKIES. H7
TEMPERATURES PROGS OF 9-11C WILL YIELD AFTERNOON HIGHS THAT WILL
GENERALLY REACH THE 70S...WITH 60S OVR EAST CENTRAL WYOMING AND
THE NRN NEBRASKA PANHANDLE.

.LONG TERM...(MONDAY THROUGH FRIDAY)
ISSUED AT 254 PM MDT FRI SEP 12 2014

MILD AND DRY WEATHER FOR MONDAY AS A SFC HIGH SLIPS SE OVER THE
CENTRAL PLAINS WITH THE CWA ON THE WESTERN PERIPHERY OF THIS MILD
AIR MASS. WARMER TEMPS RETURN MIDWEEK AS DOWNSLOPE FLOW COMBINES
WITH AMPLE SUNSHINE AND WARMING MID-LEVEL TEMPS ON THE FRONT SIDE
OF AN UPPER RIDGE OVER THE WESTERN CONUS. BY LATE IN THE WEEK SOME
MONSOONAL MOISTURE WILL TRY TO MAKE A RUN AT THE CWA BUT PRESENTLY
LOOKS LIKE THE FLOW PATTERN WILL KEEP MUCH OF IT SUPPRESSED TO THE
SOUTH. STILL MAY BE ENOUGH TO ALLOW FOR SOME SHOWERS TO RETURN BY
FRIDAY AS THE UPPER RIDGE AXIS MOVES EAST OF THE CWA AND MINOR
DISTURBANCES APPROACH THE REGION.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z SATURDAY EVENING)
ISSUED AT 254 PM MDT FRI SEP 12 2014

REMAINING CLOUDS/NEAR MVFR CIGS/OVER THE SOUTHERN PANHANDLE LATE
THIS AFTERNOON SHOULD DISSIPATE LEAVING VFR CONDITIONS WITH MAINLY
CLEAR SKIES ACROSS THE AREA TONIGHT THROUGH SATURDAY.

&&

.FIRE WEATHER...
ISSUED AT 254 PM MDT FRI SEP 12 2014

A MUCH DRIER AND MORE SEASONAL PERIOD TAKING SHAPE ACROSS THE
DISTRICT THAT WILL LAST AT LEAST INTO THE MIDDLE OF NEXT WEEK. DRY
NORTHWEST FLOW WILL HOLD ANY ORGANIZED PRECIPITATION CHANCES AT BAY.
IT WILL ALSO BOOST HIGH TEMPS BACK INTO THE 60S/70S THRU
MONDAY...WITH 70S/80S TUE-THU. MINIMUM RELATIVE HUMIDITIES ARE
EXPECTED TO HOLD ABOVE CRITICAL THRESHOLDS THRU THE FORESEEABLE
FUTURE.

&&

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

&&

$$

SHORT TERM...HAHN
LONG TERM...RE
AVIATION...RE
FIRE WEATHER...HAHN






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