Area Forecast Discussion
Issued by NWS Cheyenne, WY

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FXUS65 KCYS 182358
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
558 PM MDT SAT OCT 18 2014

.SHORT TERM...(TONIGHT THROUGH MONDAY NIGHT)
ISSUED AT 200 PM MDT SAT OCT 18 2014

A TRANQUIL WEATHER PATTERN WILL CONTINUE THROUGH THE PERIOD. LITTLE
IN THE WAY OF NOTABLE WEATHER FEATURES THIS AFTERNOON. RECENT WATER
VAPOR SATELLITE LOOP SHOWS A MID LEVEL CIRCULATION OVER NORTHEAST
NEW MEXICO...BUT ASSOCIATED MOISTURE PLUME DOES NOT EXTEND NORTH
BEYOND I-70 IN COLORADO. AS SUCH...LOOK FOR A DRY EVENING.
JUST SOME LATE AFTN CUMULUS IN THE LOW LEVELS AND OTHERWISE HIGH
CIRRUS WITH POPS NIL.

PERSISTENCE IS THE RULE INTO SUN WITH NO CHANGE IN THE OVERALL
WEATHER PATTERN. 12Z KRIW AND KDNR SOUNDINGS SHOWED H7 TEMPS IN THE
7 TO 8 DEG C RANGE...WHICH AS A GENERAL RULE HAS GIVEN WAY TO UPPER
60S TO AROUND 70 F FOR HIGHS. GFS/NAM ARE IN GOOD AGREEMENT WITH
THE SAME STORY TOMORROW...THOUGH THERMAL PROFILES WILL COOL SLIGHTLY
AS A WEAK COOL FRONT BACKS INTO THE AREA FROM THE NORTHEAST. 700
TO 300 MILLIBAR RH PROGS DRY CONSIDERABLY BY TOMORROW EVENING AS
RIDGING BECOMES ESTABLISHED. BELIEVE THIS FEATURE WILL REMAIN
INTACT THROUGH THE REMAINDER OF THE PERIOD WITH LARGE SCALE
SUBSIDENCE KEEPING PCPN AT BAY WITH LITTLE CHANGE IN TEMPERATURES
FROM DAY TO DAY. SOUTHWEST FLOW ALOFT RETURNS BY EARLY TUE MORNING
AS THE NEXT SHORTWAVE MOVES ACROSS THE WESTERN US.

.LONG TERM...(TUESDAY THROUGH SATURDAY)
ISSUED AT 230 PM MDT SAT OCT 18 2014

12Z MEDIUM RANGE MODELS ARE IN GOOD AGREEMENT WITH THE LARGE SCALE
PATTERN. GREAT PLAINS UPPER RIDGE YIELDS TO A UPPER TROUGH MOVING
FROM THE GREAT BASIN TUESDAY ACROSS THE ROCKY MOUNTAINS WEDNESDAY.
MAIN SHORTWAVE ENERGY WILL MOVE THROUGH THE CWA WEDNESDAY AFTERNOON.
A SURFACE TROUGH WILL DEVELOP OVER THE HIGH PLAINS TUESDAY...WITH
SOUTH TO SOUTHWEST WINDS INCREASING THROUGHOUT THE DAY. PACIFIC
MOISTURE WILL ALSO BEGIN TO SPREAD NORTHEAST INTO SOUTHERN AND
WESTERN WYOMING...WITH SLIGHT CHANCES FOR SHOWERS ACROSS SOUTHERN
CARBON AND ALBANY COUNTIES. IT WILL BE AN UNSEASONABLY MILD DAY
WITH HIGHS IN THE 70S TO NEAR 80 EAST OF THE LARAMIE RANGE. AS
THE SHORTWAVE ENERGY AND A PACIFIC COLD FRONT APPROACH TUESDAY
NIGHT...SHOWER COVERAGE WILL INCREASE OVER MUCH OF SOUTHEAST
WYOMING AND THE WESTERN NEBRASKA PANHANDLE. THE COLD FRONT WILL
MOVE ACROSS THE CWA WEDNESDAY MORNING WITH WINDS SHIFTING TO
NORTHERLY DIRECTION. WEAK LOW LEVEL UPSLOPE AND INSTABILITY OVER
AND EAST OF THE MOUNTAINS MAY RESULT IN A FEW AFTERNOON TSTORMS.
OTHERWISE...IT WILL BE 10-15 DEGREES COOLER WITH HIGH TEMPERATURES
IN THE 50S AND 60S. THURSDAY THROUGH SATURDAY WILL BE DRY WITH
ABOVE NORMAL TEMPERATURES AS A DEEP LAYER RIDGE OF HIGH PRESSURE
EXPANDS FROM THE SOUTHWEST CONUS ACROSS THE CENTRAL ROCKY MOUNTAINS
INTO THE NORTHERN GREAT PLAINS.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z SUNDAY AFTERNOON)
ISSUED AT 556 PM MDT SAT OCT 18 2014

VFR CONDITIONS TO PREVAIL THROUGH THE PERIOD AS WINDS SLOWLY TURN
FROM SOUTHERLY EARLY IN THE PERIOD TO MORE NORTH/NORTHEASTERLY ON
SUNDAY. EVEN SO...LIGHT WIND SPEEDS WILL CARRY LITTLE IF ANY
IMPACT AT TERMINALS.

&&

.FIRE WEATHER...
ISSUED AT 200 PM MDT SAT OCT 18 2014

NO FIRE WEATHER CONCERNS OVER THE NEXT FEW DAYS. AMPLE SUNSHINE AND
GENERALLY LIGHT WINDS ARE EXPECTED AS HIGH PRESSURE REMAINS IN PLACE
OVER THE AREA. TEMPERATURES WILL BE SEASONAL...WITH HIGHS IN THE 65
TO 75 DEGREE RANGE LOWER ELEVATIONS. MINIMUM RH VALUES SHOULD REMAIN
ABOVE 20 PERCENT AREA-WIDE.

&&

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

&&

$$

SHORT TERM...HAMMER
LONG TERM...JAMSKI
AVIATION...HAHN
FIRE WEATHER...HAMMER





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.