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 160551 RRA
AFDRIW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1150 PM MDT WED OCT 15 2014

UPDATE...UPDATED TO ADD 06Z AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH THURSDAY (ISSUED AT 333 PM MDT)

A QUICK MOVING SHORT WAVE WILL CONTINUE TO APPROACH THE AREA...
GRAZING THE NORTHWESTERN ZONES EARLY IN THE PERIOD WITH A FEW
SHOWERS IN YELLOWSTONE...THE ABSAROKAS...TETONS AND PERHAPS A FEW
SPRINKLES TONIGHT IN JACKSON VALLEY. OTHERWISE ITS MAIN IMPACT WILL
BE FROM THE COLD FRONT EXPECTED TO MOVE THROUGH OVERNIGHT AND THE
WINDS ASSOCIATED WITH THE TIGHT GRADIENT AND SOME INCOMING JET
INFLUENCE.

STEADY AND WIDESPREAD 15 TO 30 MPH SOUTHWEST WINDS WILL REMAIN WELL
INTO THE EVENING...HIGHER WINDS EXPECTED IN AREAS EXPOSED TO
SOUTHWEST FLOW LIKE THE ROCK SPRINGS TO CASPER WIND CORRIDOR AND
OVER THE HIGHER ELEVATIONS. WIND SPEEDS WILL BE FLIRTING WITH HIGH
WIND WARNING CRITERIA THIS EVENING IN SOUTHEAST FREMONT COUNTY AND
NATRONA COUNTY BUT IT IS EXPECTED TO BE ISOLATED TO HIGHER ELEVATION
AND LOW POPULATED AREAS...WILL CONTINUE TO HANDLE IT WITH A SPECIAL
WEATHER STATEMENT. PERHAPS THE HIGHEST IMPACT OF THESE WINDS WILL BE
TO TRAVEL ALONG PORTIONS OF INTERSTATES 80 AND 25...AS WELL AS ALONG
HIGHWAY 789 FROM MUDDY GAP TO BEAVER RIM AS STRONG CROSS WINDS
DEVELOP...WHICH COULD MAKE TRAVEL FOR HIGH PROFILE VEHICLES AND
LIGHT TRAILERS DIFFICULT IF NOT IMPOSSIBLE.

ONCE THE COLD FRONT MOVES THROUGH TONIGHT...WINDS SHOULD RELAX A FEW
HOURS AFTER IT PASSES. THURSDAY WILL BE ON THE COOL SIDE AS THE
WINDS RELAX AND THE COOL AIR BEHIND THE FRONT IS SLOW TO MODERATE.

.LONG TERM...THURSDAY NIGHT THROUGH WEDNESDAY

LR MDLS CONTINUE IN FAIRLY GOOD AGREEMENT WITH FLAT TO MODERATELY
AMPLIFIED UPR RIDGING AND WARM AND DRY CONDITIONS BEING THE NORM OVR
MOST OF THE FCST PERIOD...UNTIL AT LEAST LATE TUE THRU WED. BETWEEN
NOW AND THEN...SAT WILL SEE A FLEETING WEAK WASHED OUT UPR WAVE AND
AN ASSOCIATED WEAK SFC FRONT RACE ACROSS THE FA...FLATTENING THE
RIDGE SOME AND REALLY ONLY AFFECTING THE WRN/NRN FA BUT WITHOUT ANY
FANFARE...ONLY AN INCREASE IN MID/UPR CLOUDS AND MAYBE SOME VIRGA OR
A COUPLE OF SPRINKLES. SUNDAY...MORE AMPLIFIED RIDGING RETURNS
CLEARING SKIES OF MOST CLOUDS. TEMPS ON SUN...BEHIND THE
FRONT...WILL REMAIN CLOSE TO THOSE OF SAT. MON TEMPS WILL HOWEVER
WARM SOME OVER THOSE ON SUN.

TUE...THE NEXT UPR TROF WILL APPROACH FROM THE WEST AND BEGIN TO
AFFECT THE WRN CWA AS UPR LVL FLOW INCREASES ALONG WITH LIFT AND
MOISTURE IN ADDITION TO GENERATING A FRONT WHICH WILL EVENTUALLY
DRAG ACROSS THE REGION SOMETIME IN THE TUE/WED TIMEFRAME. INCREASED
POPS FOR THIS PERIOD REFLECT THIS CHANGE IN THE WX...HOWEVER THIS
EVENT DOES NOT LOOK SIGNIFICANT IN ANY RESPECT ATTM. THERE WILL ALSO
BE AN INCREASE IN SW TO W WINDS TUE/WED...ESPECIALLY ACROSS THE
SRN/SERN ZONES. WILL HAVE TO WAIT A BIT TO SEE IF ANYTHING COMES OF
THIS.

&&

.AVIATION.../06Z ISSUANCE/

GUSTY NW WINDS WILL CONTINUE ACROSS PORTIONS OF CENTRAL WYOMING
BEHIND A COLD FRONT EARLY THIS MORNING...ESPECIALLY VCNTY KDUB-KRIW.
THESE WINDS WILL DIMINISH 10Z-14Z.

A WEAK UPPER DISTURBANCE WILL MOVE ACROSS THE AREA THIS EVENING WITH
SCT-BKN MID AND HIGH CLOUDS OUT AHEAD OF THIS FEATURE...AREAS OF
CIGS FL130-150 PRIMARILY BTWN 21Z-03Z.  GENERALLY LIGHT WIND WILL
PREVAIL AFTER 15Z THURSDAY...10KTS OR LESS.

FIRE WEATHER...

A MAINLY DRY COLD FRONT WILL APPROACH THE AREA TODAY AND BRING GUSTY
WINDS TO PARTS OF THE AREA...ESPECIALLY ON THE LEE SIDE OF THE
ABSAROKAS AND WIND RIVER RANGE AND FROM THE RED DESERT THROUGH
NATRONA COUNTY. THE WIND SHOULD SUBSIDE AFTER MIDNIGHT TONIGHT. A
RIDGE OF HIGH PRESSURE WILL THEN BUILD INTO THE AREA FROM THURSDAY
INTO THE WEEKEND AND BRING TRANQUIL WEATHER. TEMPERATURES WILL COOL
ON THURSDAY BEFORE SLOWLY WARMING FRIDAY AND INTO THE WEEKEND.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...ALLEN
LONG TERM...BRAUN
AVIATION...AEM
FIRE WEATHER...ALLEN












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