National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FXUS65 KCYS 150614
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
1214 AM MDT SAT JUN 15 2013

.UPDATE...

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z SATURDAY AFTERNOON)
ISSUED AT 1215 AM MDT SAT JUN 15 2013

SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE AT
KCYS AND MOST SITES IN THE NEBRASKA PANHANDLE THROUGH 07Z. CAN
EXPECT MVFR CONDITIONS WITH GUSTY AND ERRATIC DOWNDRAFT WINDS
WITH THESE STORMS. MVFR TO IFR CEILINGS AND VISIBILITIES ARE
STILL EXPECTED BETWEEN 11Z AND 16Z AT KCYS AND THE SOUTHERN
LARAMIE RANGE TONIGHT. VFR CONDITIONS WILL OCCUR ELSEWHERE THROUGH
MUCH OF THE PERIOD. THERE IS A CHANCE FOR THUNDERSTORMS ONCE
AGAIN ALONG AND EAST OF THE LARAMIE RANGE SATURDAY AFTERNOON.

&&

.PREVIOUS UPDATE...
ISSUED AT 602 PM MDT FRI JUN 14 2013

SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ALONG A BOUNDARY WHICH
MOVED NORTH AND INTO CENTRAL LARAMIE COUNTY LATE THIS AFTERNOON.
THE STRONGEST STORM AS OF 2345Z WAS JUST NORTH OF KCYS WITH
SMALL HAIL...FREQUENT LIGHTNING AND HEAVY RAIN ASSOCIATED.
SIGNIFICANT ISENTROPIC LIFT WILL TAKE PLACE TONIGHT ALONG WITH
AN INCREASE IN MOISTURE. CLOUDS SHOULD DEVELOP EARLY TONIGHT
WITH BASES LOWERING LATER TONIGHT. SOME SHOWERS AND STORMS CAN
BE EXPECTED AS THE NIGHT GOES ON ALONG WITH AREAS OF FOG NEAR
AND WEST OF KCYS. IN A RECENT UPDATE ADJUSTED POPS AND BUMPED
LOW TEMPERATURES UP A BIT FOR TONIGHT.

&&

.SHORT TERM...(THIS EVENING THROUGH SUNDAY)
ISSUED AT 234 PM MDT FRI JUN 14 2013

UPPER LEVEL CLOUDS HAVE SHIFTED EAST THIS AFTERNOON ALLOWING
TEMPERATURES TO REACH THERE EXPECTED TEMPERATURES BUT NOW STARTING
TO SEE SOME CUMULUS POP TOWARD CHEYENNE. CAN NOT COMPLETELY RULE
OUT A SHOWER OR THUNDERSTORM FROM DEVELOPING LATE THIS AFTERNOON
BUT SHOULD STAY CAPPED. SLIGHT CHANCE FOR SHOWERS AND
THUNDERSTORMS STARTING THIS EVENING AND INTO THE OVERNIGHT AS
MIDLEVEL THETAE ADVECTION INCREASES. MODELS DO SHOW SOME ELEVATED
CAPE AND AVAILABLE EFFECTIVE SHEAR BUT CHANCES FOR SEVERE
THUNDERSTORMS IS LOW AS BEST. LOW LEVEL MOISTURE WILL CONTINUE TO
INCREASE TONIGHT SO COULD SEE LOW STRATUS AND FOG TOWARD CHEYENNE
AND INTO THE SOUTHERN LARAMIE RANGE. COULD EVEN SEE SOME SOME
DENSE FOG NEAR THE SUMMIT TOWARD SUNRISE.

CHANCES FOR THUNDERSTORMS WILL CONTINUE SATURDAY AND
SUNDAY...WITH THE MAIN THREAT INTO THE NEBRASKA PANHANDLE LATE
AFTERNOON AND EVENING...ALTHOUGH STORMS MAY BE POSSIBLE FARTHER
WEST. INCREASING LOW LEVEL MOISTURE AND INSTABILITY ALONG WITH
DEEP LAYER SHEAR WILL LIKELY SET THE STAGE FOR SEVERE
THUNDERSTORMS. LOW CLOUDS MAY LINGER THROUGH THE MORNING
SATURDAY...WHICH COULD INHIBIT DEEPER MIXING WITH A CAP INHIBITING
CONVECTION...SIMILAR TO WHAT OCCURRED YESTERDAY. SUNDAY AFTERNOON
MAY ACTUALLY BE THE HIGHER CHANCE FOR THUNDERSTORMS ESPECIALLY IF
A WEAK SHORTWAVE CAN SLIP ACROSS THE AREA.

.LONG TERM...(SUNDAY NIGHT THROUGH FRIDAY)
ISSUED AT 234 PM MDT FRI JUN 14 2013

NO SIGNIFICANT CHANGES SEEN INTO THE MID PART OF NEXT WEEK AS AN
UPPER RIDGE AMPLIFIES OVER THE ROCKIES THEN SHIFTS EAST SLOWLY
THROUGH WEDNESDAY.  IMPULSES WILL PASS ACROSS THE REGION AND HELP TO
PRODUCE WIDELY SCATTERED MAINLY AFTERNOON AND EVENING SHOWERS AND
STORMS THROUGH WEDNESDAY.  AN UPPER LOW OVER THE PACIFIC NW WILL
EJECT SLOWLY EASTWARD LATE IN THE WEEK AND SHOULD PUSH A COOL FRONT
ACROSS THE CWA WEDS NIGHT.  DRIER WESTERLY FLOW BEHIND THE FRONT
SHOULD REDUCE CONVECTION FOR THURSDAY AND FRIDAY.  NO REAL COOLING
EFFECT FROM THE FRONT THOUGH WITH TEMPERATURES STAYING CLOSE TO
SEASONAL LEVELS THROUGH THE PERIOD.

&&


.FIRE WEATHER...
ISSUED AT 234 PM MDT FRI JUN 14 2013

CHANCES FOR SHOWERS AND THUNDERSTORMS WILL MAINLY BE CONFINED TO
AREAS ALONG AND EAST OF THE LARAMIE RANGE THE NEXT SEVERAL DAYS WITH
DRY CONDITIONS TO THE WEST. SOME STRONG TO SEVERE THUNDERSTORMS WITH
BRIEF HEAVY RAIN IS POSSIBLE WITH THE THUNDERSTORMS IN THE EAST
WHILE AREAS WEST WILL CONTINUE TO DRY OUT. MAIN THUNDERSTORM CHANCE
WILL BE AFTERNOON AND EVENING ALTHOUGH A FEW SHOWERS AND
THUNDERSTORMS MAY LINGER INTO THE OVERNIGHT HOURS. THE FIRST CHANCE
FOR SHOWERS AND THUNDERSTORMS WILL BE THIS EVENING INTO THE
OVERNIGHT.

&&

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

$$

UPDATE...WEILAND
SHORT TERM...LIEBL
LONG TERM...RE
AVIATION...RJM
FIRE WEATHER...LIEBL