Area Forecast Discussion
Issued by NWS Riverton, WY

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS65 KRIW 210523
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1123 PM MDT SUN JUL 20 2014

.SHORT TERM...TONIGHT THROUGH MONDAY

A SERIES OF WEAK SHORT WAVE TROUGHS WILL MOVE THROUGH THE WEST
SOUTHWEST FLOW ALOFT BRINGING LIMITED MONSOON MOISTURE INTO WEST
THROUGH SOUTH CENTRAL WYOMING TONIGHT AND MONDAY. THIS WILL HELP
SUPPORT ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WITH STRONG
OUTFLOW WIND GUSTS THIS EVENING AND AGAIN MONDAY AFTERNOON AND
EVENING MAINLY IN SOUTH CENTRAL WYOMING AND OVER THE MOUNTAINS.
THUNDERSTORMS WILL SHIFT MORE INTO THE NORTHERN MOUNTAINS MONDAY
AFTERNOON AS SOME DRYING MOVES INTO THE SOUTH.  CONDITIONS WILL BE
DRY AND BREEZY OUTSIDE OF THE THUNDERSTORM ACTIVITY.

.LONG TERM...MONDAY NIGHT THROUGH SUNDAY

A WEAK NORTHERN STREAM SHORTWAVE WILL TRACK EAST ACROSS THE NORTHERN
ROCKIES AND WILL EXIT THE AREA MONDAY EVENING. THIS FEATURE WILL
COINCIDE WITH A SOUTHERN STREAM VORT LOBE THAT WILL RESULT IN A GOOD
CHANCE OF THUNDERSTORMS ACROSS MAINLY NORTHWEST WYOMING ALONG WITH A
LESSER CHANCE OF STORMS OVER THE BIG HORN MTNS AND THE FAR NORTHERN
TIER OF THE BIG HORN BASIN EARLY MONDAY EVENING. AN ASSOCIATED COOL
FRONT WILL DROP TEMPERATURES A FEW DEGREES TUESDAY BEHIND THIS
EXITING FEATURE. THEN AS A PROMINENT CIRCULATION NOW OVER THE GULF
OF ALASKA TRACKS TO THE PACIFIC NORTHWEST COAST...THE FLOW WILL
INCREASE FROM THE SOUTHWEST AHEAD OF THIS APPROACHING FEATURE
USHERING IN MORE HEAT FOR WEDNESDAY AND THURSDAY WITH HIGHS REACHING
AS HIGH AS THE UPPER 90S IN THE BIG HORN BASIN DURING THIS TIME
FRAME. WITH THE ANTICIPATED HEAT...MIN RH IN THE LOW TO MID TEENS
AND INCREASING SOUTHWEST WINDS...FIRE DANGER WILL LIKELY BE AN
ISSUE ONCE AGAIN. MAINLY ISOLATED THUNDERSTORMS ARE EXPECTED THROUGH
MID WEEK. THEN AS THE AFOREMENTIONED PROMINENT STACKED H7-H3 LOW
TRACKS FROM THE PAC NW THU TO SASK FRIDAY...A TRAILING SHORTWAVE
TROUGH WILL TRACK ACROSS THE REGION THU WITH THE MAIN FLOW VEERING
FROM SOUTHWEST TO WESTERLY SHUNTING ANY REMAINING MEAGER MONSOON
MOISTURE WELL TO OUR SOUTH FOR DRY CONDITIONS FRIDAY THROUGH THE
WEEKEND. TEMPERATURES WILL BE COOLER FOR FRIDAY THROUGH THE WEEKEND
BEHIND THIS MAIN SHORTWAVE.

.AVIATION.../06Z ISSUANCE/

THE ONGOING ISOLATED CONVECTION /SHRA/ MAINLY OVER THE
WEST/NORTHWEST COULD PERSIST FOR THE REMAINDER OF TONIGHT. HOWEVER
WITH DAYTIME HEATING ON MONDAY ISOLATED TO SCATTERED CONVECTION /SHRA
AND TSRA/ WILL DEVELOP LATE IN THE MORNING/EARLY AFTERNOON AND LAST
THROUGH THE EARLY MONDAY EVENING...MAINLY ALONG AND NORTHWEST OF A
KBPI-KDUB-KTHP-KBYG LINE. THE TERMINALS MOST IMPACTED BY CONVECTION
SHOULD BE KJAC AND KCOD. VFR CONDITIONS ARE EXPECTED...EXCEPT
BRIEF IFR/MVFR CONDITIONS ASSOCIATED WITH ANY CONVECTION. BREEZY
WEST TO SOUTHWEST WINDS WILL BE OBSERVED IN MOST LOCATIONS MONDAY
AFTERNOON...WITH ERRATIC AND GUSTY WINDS NEAR ANY CONVECTION. MUCH
OF THE CONVECTION WILL WANE BY AROUND 03Z TUESDAY...BUT ISOLATED
CONVECTION COULD CONTINUE WELL INTO THE NIGHT...MAINLY OVER THE
NORTHWEST.

.FIRE WEATHER...

A RED FLAG WARNING REMAINS IN EFFECT FOR FIRE WEATHER ZONES 279 AND 280
UNTIL 8 PM THIS EVENING...AND AGAIN FROM NOON TO 8 PM MDT ON
MONDAY FOR STRONG DRY WEST SOUTHWEST WINDS AND VERY LOW RELATIVE
HUMIDITY.

A SERIES OF WEAK SHORT WAVE TROUGHS WILL MOVE THROUGH THE WEST
SOUTHWEST FLOW ALOFT BRINGING LIMITED MONSOON MOISTURE INTO WEST
THROUGH SOUTH CENTRAL WYOMING TONIGHT AND MONDAY. THIS WILL HELP
SUPPORT ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WITH STRONG
OUTFLOW WIND GUSTS THIS EVENING AND AGAIN MONDAY AFTERNOON AND
EVENING MAINLY IN SOUTH CENTRAL WYOMING AND OVER THE MOUNTAINS.
CONDITIONS WILL BE DRY AND BREEZY OUTSIDE OF THE THUNDERSTORM
ACTIVITY.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING FROM NOON TO 8 PM MDT MONDAY WYZ279-280.

&&

$$

SHORT TERM...C.BAKER
LONG TERM...LIPSON
AVIATION...WM
FIRE WEATHER...C.BAKER




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.