Area Forecast Discussion
Issued by NWS Cheyenne, WY

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000
FXUS65 KCYS 250927 CCA
AFDCYS

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
218 AM MST SUN JAN 25 2015

.SHORT TERM...(TODAY THROUGH TUESDAY NIGHT)

ISSUED AT 1257 AM MST SUN JAN 25 2015

A WELL-DEFINED MID LEVEL SHORTWAVE CONTINUES TO DIVE QUICKLY ACROSS
THE CENTRAL PLAINS EARLY THIS MORNING. THIS SYSTEM WAS RESPONSIBLE
FOR SCATTERED RAIN AND/OR SNOW SHOWERS ACROSS MUCH OF SOUTHEAST WY
AND THE WESTERN NE PANHANDLE LAST EVENING. HOWEVER...LATEST TRENDS
IN RADAR/SAT IMAGERY INDICATE THIS ACTIVITY HAS GREATLY DIMINISHED
IN COVERAGE AS OF 08Z OWING TO INCREASING SUBSIDENCE IN THE WAKE OF
THE DEPARTING WAVE. WE ARE STILL SEEING A FEW WEAK ECHOS FROM KCYS
ALONG THE WY/NE STATE LINE NEAR SCOTTSBLUFF...BUT POTENTIAL FOR ANY
MEASURABLE PCPN IS UNLIKELY WITH DRYING LOW LEVELS AND LARGER SCALE
SINKING MOTION OVERSPREADING THE AREA. LLVL GRADIENTS STAY ELEVATED
TODAY WITH AROUND 50 METERS BETWEEN CAG-CPR AT H85. FAST NORTHWEST
FLOW ALOFT PERSISTS WITH A 130 KT H25 JET OVER EASTERN MT/WY...SO
THE WIND PRONE AREAS WILL UNDOUBTEDLY BE QUITE WINDY. A FEW WYDOT
SENSORS NEAR ARLINGTON HAVE RECORDED WINDS NEAR 50 MPH IN THE LAST
COUPLE OF HOURS...BUT DO NOT EXPECT WARNING CRITERIA GUSTS AS THE
MODELS SUGGEST WEAKENING FLOW ALOFT WITH TIME. A PRETTY UNEVENTFUL
SHORT TERM PERIOD ASIDE FROM BREEZY CONDITIONS TODAY. GFS/NAM/ECM
ARE IN EXCELLENT AGREEMENT WITH BROAD UPPER-LEVEL RIDGING BECOMING
ESTABLISHED ON MON/TUE. H7 TEMPS ARE PROGGED TO BE AROUND 5-7 DEG C
AT 00Z TUE. NO REAL CONCERNS ABOUT CIRRUS EITHER WITH FAIRLY DRY RH
PROGS BETWEEN H2-H3 PER THE GFS. ADIABATIC WARMING IS LIKELY WITH
GOOD SUBSIDENCE AND WESTERLY LLVL DOWNSLOPE...SO TEND TO FAVOR THE
WARMER MOS WITH HIGHS AROUND 65 F OVER THE PLAINS. COULD SEE A FEW
RECORDS THREATENED EARLY IN THE WORK WEEK. PCPN CHANCES WILL BE ON
THE INCREASE OVER THE FAR SOUTHWEST ON TUE NIGHT AHEAD OF A STRONG
SHORTWAVE LIFTING ACROSS CENTRAL UTAH.

.LONG TERM...(WEDNESDAY THROUGH SATURDAY)
ISSUED AT 300 AM MST SUN JAN 25 2015

UPPER RIDGE THAT GAVE US THE WARM TEMPERATURES STILL FORECAST TO
MOVE INTO EASTERN NEBRASKA WEDNESDAY MORNING. SHORTWAVE TROUGH
MOVES THROUGH WYOMING WEDNESDAY AFTERNOON FOR A RETURN OF COLDER
TEMPERATURES AND MOUNTAIN SNOW. BY WEDNESDAY AFTERNOON...GFS 700MB
TEMPERATURES FALL TO -6C...DOWN FROM +4C TUESDAY AFTERNOON.

GOING TO BE WINDY WITH THE ASSOCIATED COLD FRONT MOVING THROUGH
WEDNESDAY. GFS 700MB WINDS 45 TO 50KTS...SO LIKELY TO SEE WIND
HEADLINES FOR THE WIND PRONE AREAS. ABOUT .3 TO .4 INCHES QPF FOR
THE MOUNTAINS OUT WEST WITH THIS SYSTEM...SO COULD SEE ADVISORY
LEVEL SNOW AMOUNTS FOR THE SNOWY AND SIERRA MADRE RANGES.

ANOTHER WEAK SYSTEM FOR FRIDAY THAT WILL BRING SOME MORE LIGHT
SNOW AMOUNTS FOR THE MOUNTAINS. MOST EVERYWHERE ELSE SHOULD STAY
DRY WITH THIS SYSTEM.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SUNDAY NIGHT)
ISSUED AT 948 PM MST SAT JAN 24 2015

VFR PREVAILS...EXCEPT FOR MVFR AT TIMES AT RAWLINS FROM 09Z TO
15Z. GUSTY WINDS THIS SUNDAY MORNING AND AFTERNOON.

&&

.FIRE WEATHER...
ISSUED AT 1257 AM MST SUN JAN 25 2015

NO MAJOR FIRE WEATHER CONCERNS. WARM TEMPERATURES AND LOCALLY BREEZY
CONDITIONS ARE LIKELY THROUGH MONDAY AFTERNOON. ALL PARAMETERS ARE
EXPECTED TO BE WELL BELOW CRITICAL THRESHOLDS.

&&

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

$$

SHORT TERM...CLH
LONG TERM...GCC
AVIATION...GCC
FIRE WEATHER...CLH



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