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000
FXUS65 KCYS 202329
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
529 PM MDT SUN APR 20 2014

.SHORT TERM...(THIS EVENING THROUGH TUESDAY NIGHT)
ISSUED AT 311 PM MDT SUN APR 20 2014

CONVECTION DEVELOPED RIGHT ON TIME THIS AFTERNOON. NO LONGER
EXPECTING MUCH IN THE WAY OF THUNDER. UPPER DYNAMICS ARE WEAK AT
BEST WITH RELATIVELY LIMITED MOISTURE. ALSO SOUNDINGS SUGGEST
VERTICAL GROWTH IS LIMITED BY MID LEVEL WARM LAYER...SO MAINLY
LOOKING AT SHORT SHOWERS THE REST OF TODAY. COULD BE A RANDOM
LIGHTNING STRIKE HERE OR THERE BUT THE BEST CHANCE FOR ANY
LIGHTNING WILL BE NEAR THE MOUNTAINS WHERE UPSLOPE COMPONENT MAY
BE JUST ENOUGH FOR SLIGHTLY STRONGER CONVECTION...AND EVEN THAT
WILL BE REMOTE. NO THREAT FOR SEVERE WEATHER TODAY OR TONIGHT.
ONCE THE DAYTIME HEATING IS LOST...SHOWERS WILL RAPIDLY DIE OFF
THE EVENING.

LESS CHANCE FOR SHOWER ACTIVITY TOMORROW. THERE MAY BE ENOUGH LOW
LEVEL CONVERGENCE ALONG THE LARAMIE RANGE FOR SOME MID TO LATE
AFTERNOON SHOWERS. OTHERWISE LIGHT WINDS AND MILD TEMPERATURES
FOR THE START OF THE WORK WEEK.

THINGS START TO GET MORE INTERESTING TUESDAY. UPPER LEVEL TROUGH
WILL BE MOVING INLAND OFF THE WEST COAST. MODELS SHOWING A TONGUE OF
LOW LEVEL MOISTURE STREAMING INTO THE NEBRASKA PANHANDLE AHEAD OF
THE UPPER LEVEL TROUGH WITH SURFACE DEW POINTS IN THE MID 40S.
SHOULD BE ENOUGH LOW LEVEL MOISTURE FOR SOME THUNDERSTORM
ACTIVITY. SHEAR PROFILES INDICATE THE POTENTIAL FOR SOME STRONGER
STORMS. TOUGH TO SAY THE SEVERE THREAT AT THIS TIME BUT WITH WINDS
ALOFT SO STRONG AND LIMITED CAPE VALUES...STORMS THAT DO DEVELOP
COULD QUICKLY GET RIPPED APART BY THE STRONG SHEAR.

WILL ALSO HAVE TO KEEP AN EYE ON SYNOPTIC DRIVEN WINDS IN THE
WEST. MODELS SHOWING 700 MB WINDS INCREASING TO 50-60 KTS BY
TUESDAY EVENING. COULD SEE NEAR HIGH WIND WARNING TYPE WINDS
ACROSS WESTERN PORTIONS OF CARBON AND FAR WEST CONVERSE COUNTIES.


.LONG TERM...(WEDNESDAY THROUGH SUNDAY)
ISSUED AT 245 PM MDT SUN APR 20 2014

A RATHER PROGRESSIVE PATTERN WILL CONTINUE OVER THE REGION THIS
PERIOD WITH A COUPLE OF UPPER TROUGHS AFFECTING THE AREA. THE
FIRST WILL PASS ACROSS THE CWA WEDS BUT WIND WILL BE THE MAIN
WEATHER BROUGHT BY THIS SYSTEM WITH THE UPPER LOW MOVING WELL
NORTH OF THE CWA. A FEW SHOWERS WILL STILL OCCUR MAINLY OVER THE
MTNS. COOLER WEDS THEN REMAINING MILD THURSDAY AND FRIDAY WITH A
SHORT UPPER RIDGE PASSING ACROSS LATE FRIDAY. NEXT UPPER SYSTEM
WILL THEN BEGIN TO AFFECT THE CWA SATURDAY BRINGING A BETTER
CHANCE FOR RAIN AND SOME HIGH ELEVATION SNOW BY LATE IN THE
DAY...CONTINUING SUNDAY AS THE SYSTEM BECOMES NEGATIVELY TILTED AS
IT MOVES OVER THE ROCKY MTN AREA.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z MONDAY AFTERNOON)
ISSUED AT 519 PM MDT SUN APR 20 2014

LATEST SURFACE ANALYSIS WAS SHOWING THE WEAK SURFACE BOUNDARY
PASSING THROUGH THE SOUTHERN PANHANDLE. THIS FEATURE IS HELPING
CLEAR OUT THE CLOUDS ESPECIALLY IN THE PANHANDLE. MEANWHILE...THE
SHOWER ACTIVITY IN SOUTHEAST WYOMING SHOULD CONTINUE TO DISSIPATE
BY SUNSET. SURFACE RIDGE IS PROGGED TO PUSH ACROSS THE TAF SITES
TONIGHT INTO MONDAY MORNING. AS THIS RIDGE AXIS PUSHES
ACROSS...THE WIND SHOULD BEGIN TO DIMINISH AND BECOME MORE
VARIABLE ESPECIALLY AFTER MIDNIGHT. SOUTHEAST WINDS SHOULD
COMMENCE EAST OF THE LARAMIE RANGE TOMORROW AFTERNOON...BUT SHOULD
REMAIN LIGHT.

&&

.FIRE WEATHER...
ISSUED AT 255 PM MDT SUN APR 20 2014

SHOWERS WILL QUICKLY DIE OFF ACROSS THE AREA THIS EVENING WITH THE
LOSS OF DAYTIME HEATING. A COLD FRONT WILL PUSH ACROSS THE AREA
THIS EVENING MAKING FOR A SLIGHTLY COOLER DAY EAST OF THE LARAMIE
RANGE MONDAY. A FEW LIGHT RAIN SHOWERS POSSIBLE ALONG THE LARAMIE
RANGE MONDAY AFTERNOON OTHERWISE DRY FOR MONDAY. ANOTHER CHANCE
FOR SHOWERS AND THUNDERSTORMS IS POSSIBLE ON TUESDAY...WITH STRONG
GUSTY WINDS POSSIBLE TUESDAY NIGHT THROUGH THURSDAY.

&&

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

$$

SHORT TERM...SML
LONG TERM...RE
AVIATION...REC
FIRE WEATHER...SML