Area Forecast Discussion
Issued by NWS Cheyenne, WY

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000
FXUS65 KCYS 260940
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
340 AM MDT FRI JUN 26 2015

.SHORT TERM...(TODAY THROUGH SUNDAY NIGHT)
ISSUED AT 345 AM MDT FRI JUN 26 2015

TODAY...PERPLEXING FOG SITUATION. DENSE FOG FORMED QUICKLY AT
CHEYENNE AROUND MIDNIGHT...THEN SUDDENLY DISSIPATED. THIS MAY BE AS
THE BOUNDARY LAYER WINDS TURNED FROM EAST TO NORTH. TEMPERATURE AND
DEWPOINT SPREADS ARE FAIRLY NARROW ALONG AND EAST OF A DOUGLAS TO
LARAMIE LINE...SO WILL MONITOR TRENDS AND LIKELY JUST HAVE PATCHY
FOG IN THE GRIDS THROUGH THE EARLY MORNING HOURS.

ONLY CHALLENGE TODAY WILL BE POSSIBLE ISOLATED THUNDERSTORMS THIS
AFTERNOON ALONG THE SOUTHERN LARAMIE RANGE. NAM AND GFS BOTH PAINT
ISOLATED THUNDERSTORMS DEVELOPING IN THE AFTERNOON IN AN AREA
ROUGHLY BOUNDED BY LARAMIE...WHEATLAND AND CHEYENNE AND THIS LOOKS
DECENT BASED ON THE FORECAST 850/700 MB THETA-E RIDGE AXIS AND WITH
DIFFERENTIAL HEATING AND OROGRAPHIC EFFECTS. DRY ELSEWHERE.

TONIGHT...THUNDERSTORMS QUICKLY ENDING IN THE EVENING WITH THE LOSS
OF HEATING AND WITH NO OTHER LIFTING MECHANISM.

SATURDAY...CHAMBER OF COMMERCE TYPE DAY WITH MINIMAL LOW AND MID
LEVEL MOISTURE TO FUEL ANY THUNDERSTORMS AND MINIMAL CLOUD COVER
WITH THE RIDGE ALOFT NOT TOO FAR TO OUR WEST. ISOLATED
THUNDERSTORMS...LATE DAY OVER THE SNOWY AND SIERRA MADRE RANGES IN
850/700 MB THETA-E RIDGE AXIS...DRY ELSEWHERE.

SATURDAY NIGHT/SUNDAY/SUNDAY NIGHT...RELATIVELY STABLE NORTH FLOW
ALOFT AND AT LOW LEVEL CONTINUES. ISOLATED LATE DAY THUNDERSTORMS
OVER OUR SNOWY AND SIERRA MADRE RANGES...NEAR THE LOW AND MID LEVEL
THETA-E RIDGE AXIS...DRY ELSEWHERE.

.LONG TERM...(MONDAY THROUGH THURSDAY)
ISSUED AT 345 AM MDT FRI JUN 26 2015

LARGE UPPER HIGH OVER THE WESTERN CONUS SHOULD PROVIDE A VERY WARM
AND MAINLY DRY DAY ACROSS THE CWA MONDAY. THE UPPER HIGH WILL
FLATTEN SOME MONDAY NIGHT AND TUESDAY AS SHORTWAVE ENERGY COMES
OFF THE ERN PACIFIC AND OVER THE PACIFIC NW AND NRN ROCKIES BEFORE
TURNING SE AND ACROSS THE CWA LATE TUESDAY. THIS WILL PUSH A WEAK
SFC FRONT ACROSS THE CWA LATER TUESDAY AND BRING SOME INCREASE IN
CONVECTIVE ACTIVITY LATER TUESDAY INTO TUESDAY EVENING. WEDS AND
THURSDAY WILL BE A LITTLE COOLER AS THICKNESSES LOWER A BIT WITH
WEAK IMPULSES RIDING ACROSS THE CWA HELPING TO SET OFF ISOLATED
MAINLY LATE DAY SHOWERS AND TSTRMS AS A RATHER MONSOONAL MOISTURE
FLOW LOOKS TO DEVELOP.

&&

.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 345 AM MDT FRI JUN 26 2015

MAINLY VFR EXPECTED OVER ALL TERMINALS THROUGH THIS PERIOD. THERE
WILL BE PATCHY MVFR CIGS MAINLY AFFECTING KCDR AND KAIA EARLY THIS
MORNING ALONG WITH PATCHY FOG REDUCING VSBYS TO IFR FOR SHORT
PERIODS OF TIME.

&&

.FIRE WEATHER...
ISSUED AT 345 AM MDT FRI JUN 26 2015

MINIMAL CONCERNS BASED ON PROJECTED HUMIDITIES AND WINDS.

&&

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

$$

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



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