712
FXUS65 KCYS 260320
AFDCYS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
920 PM MDT SUN OCT 25 2020
UPDATE
ISSUED AT 835 PM MDT SUN OCT 25 2020
AREAS OF SNOW SHOWERS CONTINUE ACROSS FAR SOUTHEAST WYOMING AND
THE WESTERN NEBRASKA PANHANDLE AND WILL CONTINUE THROUGH THE EARLY
MORNING. A WINTER STORM WARNING IS IN PLACE THROUGH 6 AM MT TO
COVER THE CONTINUED THEAT. WITH THE COLD AIR MASS NOW FIRMLY IN
PLACE AND WITH CLEARING SKIES OVER THE NEXT 12 HOURS, TEMPERATURES
WILL BE ESPECIALLY COLD TONIGHT AND TOMORROW, EVEN TOMORROW NIGHT.
HAVE OPTED TO ISSUE A WIND CHILL ADVISORY FOR AREAS OF CARBON
COUNTY, NORTHERN ALBANY COUNTY AND CONVERSE COUNTY TO COVER THE
THREAT OF TEMPERATURES FEELING LIKE -20 DEGREES AND BELOW. WHETHER
OR NOT AREAS REACH THIS THRESHOLD, TEMPERATURES WILL BE VERY COLD
ALL AROUND AND CAUTION SHOULD BE EXCERSIZED WHEN THINKING ABOUT
SPENDING TIME OUTDOORS. LUCKILY, WINDS ARE NOT WYOMING STRONG, SO
BLOWING SNOW WILL BE LIMITED. FORECAST IS ON TRACK.
SHORT TERM
(THIS EVENING THROUGH TUESDAY)
ISSUED AT 300 PM MDT SUN OCT 25 2020
LIGHT SNOW CONTINUING OVER THE CWA THIS AFTERNOON BUT IS TAPERING
OFF OVER NORTHERN AREAS. EXPECT SNOW TO CONTINUE TAPERING OFF OVER
THE REST OF THE CWA OVERNIGHT AS BETTER DYNAMICS SHIFT TO THE
SOUTH. MONDAY AND TUESDAY WILL BE DRY. OTHER CONCERN WILL BE WITH
THE COLD TEMPERATURES THAT WILL BE OVER THE CWA THROUGH MONDAY
WITH SOME SUB-ZERO MINS POSSIBLE MONDAY MORNING. ANOTHER VERY COLD
NIGHT MONDAY NIGHT WITH CLEAR SKIES EXPECTED. THAT WITH SNOW COVER
WILL ALLOW TEMPERATURES TO FALL TO AROUND ZERO, AND EVEN COLDER IN
WESTERN VALLEYS. WARMER CONDITIONS RETURN TUESDAY BUT WENT BELOW
GUIDANCE MAXIMUMS DUE TO SNOW COVER REMAINING.
LONG TERM
(TUESDAY NIGHT - SATURDAY)
ISSUED AT 308 AM MDT SUN OCT 25 2020
A GENERAL TRANSITION TO WARMER & DRIER WEATHER CAN BE EXPECTED FOR
THE EXTENDED FORECAST PERIOD. IN AREAS WHERE SIGNIFICANT SNOW DOES
FALL, COLD TEMPERATURES ARE LIKELY TO PERSIST THROUGH WEDNESDAY AT
THE EARLIEST. THE GFS AND ECMWF CONTINUE TO DEVELOP A CLOSED UPPER
LOW OVER THE SOUTHERN PLAINS THROUGH MID-WEEK, BUT AT THIS TIME IT
APPEARS THIS WILL REMAIN TOO FAR SOUTH TO CAUSE ANY IMPACTS TO OUR
REGION. BROAD UPPER-LEVEL RIDGING IS EXPECTED TO TAKE SHAPE BY THE
LATTER HALF OF THE WEEK.
AVIATION
(FOR THE 00Z TAFS THROUGH 00Z MONDAY EVENING)
ISSUED AT 555 PM MDT SUN OCT 25 2020
WYOMING TAFS...VFR AT RAWLINS WITH OCCASIONAL MVFR UNTIL 04Z, AND
OCCASIONAL IFR FROM 04Z TO 08Z. WIND GUSTS TO 27 KNOTS UNTIL 04Z.
OCCASIONAL IFR AT LARAMIE UNTIL 04Z, THEN IFR UNTIL 15Z, THEN VFR.
OCCASIONAL IFR AT CHEYENNE UNTIL 04Z, THEN IFR UNTIL 15Z, THEN
VFR.
NEBRASKA TAFS...OCCASIONAL IFR AT CHADRON AND ALLIANCE UNTIL 04Z,
THEN MVFR UNTIL 15Z, THEN VFR.
OCCASIONAL IFR AT SCOTTSBLUFF AND SIDNEY UNTIL 04Z, THEN IFR UNTIL
15Z, THEN VFR.
FIRE WEATHER
ISSUED AT 300 PM MDT SUN OCT 25 2020
FIRE WEATHER CONCERNS WILL BE LOW PRETTY MUCH THROUGH THE
UPCOMING WEEK. THE CURRENT WINTER STORM SYSTEM AFFECTING THE AREA
WILL PULL OUT TONIGHT LEAVING A PRETTY QUITE WEEK IN ITS WAKE.
TEMPERATURES WILL BE VERY COLD OVERNIGHT AND MONDAY THEN A GRADUAL
WARMING TREND IS EXPECTED THE REST OF THE WEEK WITH DRY WEATHER.
CYS WATCHES/WARNINGS/ADVISORIES
WY...WINTER STORM WARNING UNTIL 6 AM MDT MONDAY FOR WYZ106>108-110-
112>119.
WIND CHILL ADVISORY UNTIL 9 AM MDT MONDAY FOR WYZ101-103>105-109-
111.
NE...WINTER STORM WARNING UNTIL 6 AM MDT MONDAY FOR NEZ003-019>021-
054-055-096.
UPDATE...AB
SHORT TERM...RE
LONG TERM...CLH
AVIATION...RUBIN
FIRE WEATHER...RE
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