Issued by NWS Cheyenne, WY
000 FXUS65 KCYS 132003 AFDCYS AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 200 PM MDT MON OCT 13 2008 .SHORT TERM...TONIGHT THRU WED...WATER VAPOR PIXS STILL SHOW THE WEAK UPPER LOW OVER SE UT...BUT NOT MANY CLOUDS YET WITH SYSTEM. MODELS ALL AGREE THAT THINGS WILL CHANGE ON TUE AS UPPER LOW STARTS SHIFTING ENE ACROSS SRN CO. MINIMAL EFFECTS ON OUR AREA EXCEPT FOR PERHAPS SOME MID/HIGH CLOUDS ACROSS THE FAR SRN PART OF THE PNHNDL BY AFTN/EVENG. ANOTHER WEAK UPPER TROF IN THE NRN STREAM ZIPS E ACROSS THE CANADIAN BORDER ON TUE...WHICH HELPS TO DRIVE A WEAK BACKDOOR TYPE COOL FRONT THRU THE E PART OF THE AREA TUE NIGHT. ANOTHER WEAK UPPER TROF THEN MOVES INTO WRN WY ON WED AFTN. ONCE THE WINDS DIE OFF THIS EVENG...SHOULD BE QUITE COLD...BUT NO NEED FOR ANY FRZ HILITE AS MOST AREAS HAVE ALREADY BEEN 28 OR LOWER. WARMER ON TUE WITH SOME W/SW WINDS...NOT AS MUCH AS TODAY THO. WARMER MINS ON TUE NIGHT...WITH SOME COOLING ON WED MAINLY NERN HALF OF AREA. SNOW WITH RECENT STORM JUST CLIPPED FAR WRN CONVERSE AND FAR NRN CARBON COUNTIES WHERE THERE COULD BE SOME LOWER TEMPS THRU TUE. .LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY OCTOBER 20TH. THURSDAY...MILD WITH NORTHWEST FLOW ALOFT AND THICKNESSES NEAR 5610 METERS. MAXIMUM TEMPERATURES IN THE 50S AND 60S. FRIDAY...VERY MILD END TO THE WORKWEEK AS A LARGE AMPLITUDE RIDGE ALOFT BUILDS ACROSS THE ROCKIES. DAYTIME MAXIMA IN THE 60S AND LOWER 70S WITH 1000-500 MB THICKNESSES ABOVE 5670 METERS. SATURDAY/SUNDAY...DRY AND MILD WEEKEND WITH WEST FLOW ALOFT AND WARMER THAN NORMAL 500 MB HEIGHTS. HIGHS SATURDAY IN THE 60S TO MID 70S WITH THICKNESSES NEAR 5670 METERS AND WARMING DOWNSLOPE WEST WINDS. SLIGHTLY COOLER ON SUNDAY WITH A WEAK COLD FRONTAL PASSAGE AND WITH THICKNESSES FALLING BELOW 5610 METERS. MONDAY...SHORTWAVE TROUGH ALOFT MOVES ACROSS IDAHO AND MONTANA WITH SOUTHWEST FLOW ALOFT ACROSS WYOMING...INDUCING A DECENT SURFACE LEE TROUGH ACROSS THE FOOTHILLS OF THE ROCKIES. THUS A BREEZY AND MILD DAY WITH MAXIMUM TEMPERATURES IN THE MID 50S TO LOWER 70S...WITH THE WARMEST READINGS IN THE NORTH PLATTE RIVER VALLEY. -RUBIN- && .AVIATION...VFR CONDS THRU TUE. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && $$ LONG TERM...RUBIN
