Special Weather Statement, NWS Riverton, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
251 PM MDT FRI JUL 27 2012

.SHORT TERM...TONIGHT THROUGH MONDAY
MONSOONAL PLUME IS MOVING THROUGH THE FORECAST AREA TODAY WITH
SEVERAL AREAS OF CONCERN INTO THE EVENING HOURS. THE HIGHEST
THREAT OF SEVERE WIND GUSTS FROM HIGH BASED STORMS IS AROUND
NATRONA COUNTY BUT ALSO EXTENDS INTO SWEETWATER AND FREMONT
COUNTY. IN THE FAR WEST...CAPE IS BUILDING ALONG AND WEST OF THE
BORDER AND WE EXPECT STORMS TO FIRE THERE LATER THIS AFTERNOON AND
MOVE INTO THE NORTHWEST ESPECIALLY. A FEW STRONGER STORMS HAVE
BEEN MOVING ACROSS THE NORTHERN PART OF YNP PARK OVER THE LAST 1
TO 2 HOURS. A LITTLE BETTER MOISTURE EXISTS IN THE FAR NORTH WHICH
COULD AID IN A FEW STRONGER STORMS...INCLUDING NORTHERN AND
EASTERN JOHNSON. THE PLUME IS SHUNTED TO THE EAST AND SOUTH ON
SATURDAY AS THE RIDGE REBUILDS OVER THE AREA. IT STILL LOOKS LIKE
THE BEST BEST OF ISOLATED STORMS WILL BE OVER THE FAR SOUTH...EAST...
NORTHERN BORDER AND A FEW IN THE MOUNTAINS. NOT A LOT OF CHANGE
FOR SUNDAY OR MONDAY. CONTINUED VERY WARM TO HOT EACH DAY.

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY
MODELS STILL INDICATING A BROADENING OF THE HIGH PRESSURE RIDGE OVER
THE ROCKIES ASSOCIATED WITH THE HIGH OVER THE SOUTHWEST UNITED
STATES AND SOUTHERN PLAINS THROUGH MID WEEK. THIS WOULD TRANSLATE
INTO A DRY FORECAST WITH MAINLY A WEST SOUTHWEST STEERING FLOW
KEEPING MOST OF ANY MONSOON MOISTURE TO OUR SOUTH. THEN A TROUGH
APPROACHES FROM THE WEST BY THURSDAY AND FRIDAY WITH ONLY ISOLATED
ACTIVITY INDICATED FOR NOW OVER THE HIGHER TERRAIN BY THURSDAY.

.AVIATION.../00Z ISSUANCE/
SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE UNTIL 00Z. WIND
GUSTS TO 35 KNOTS WILL BE POSSIBLE ALONG WITH LOCAL MVFR CONDITIONS.
THE SHOWER AND STORM COVERAGE WILL BECOME ISOLATED AFTER 00Z THROUGH
12Z SATURDAY.

EAST OF THE CONTINENTAL DIVIDE...SCATTERED SHOWERS AND THUNDERSTORMS
WILL CONTINUE TO FORM ALONG THE WIND RIVER AND ABSAROKA MOUNTAINS
AND THE BIGHORN MOUNTAINS. THE SHOWERS AND STORMS WILL PROGRESS EAST
TO NORTHEAST OVER THE LOWER ELEVATIONS THROUGH THE REMAINDER OF THE
AFTERNOON HOURS UNTIL AROUND 03Z. WIND GUSTS TO 45 KNOTS WILL BE
POSSIBLE...ESPECIALLY IN NATRONA COUNTY INCLUDING KCPR ALONG WITH
LOCAL MVFR CONDITIONS. THE ACTIVITY WILL DECREASE TO ISOLATED FROM
06Z THROUGH 12Z SATURDAY.

FOR KJAC AIRPORT TODAY AND THIS EVENING...SCATTERED SHOWERS AND
STORMS WILL CONTINUE ACROSS EASTERN IDAHO AND OVER THE TETON
MOUNTAINS. SOME OF THIS ACTIVITY WILL IMPACT THE KJAC AIRPORT OR IN
THE VICINITY UNTIL 00Z. WIND GUSTS TO 30 TO 40 KNOTS AND MVFR
CONDITIONS WILL OCCUR ONLY IF A STORM DIRECTLY IMPACTS THE AIRPORT.
EXPECT THE ACTIVITY TO DECREASE AFTER 00Z SATURDAY AS THE STORMS
WILL MOVE EAST NORTHEAST OUT OF THE REGION.

.FIRE WEATHER...
VERY STRONG TO DAMAGING WINDS ARE POSSIBLE EAST OF THE DIVIDE INTO
THE EARLY EVENING...ESPECIALLY ACROSS THE CENTRAL AND SOUTH PART
OF THE DISTRICT. STRONGER...WETTER STORMS ARE POSSIBLE IN THE
NORTHWEST AND FAR NORTHERN PART OF THE DISTRICT. THE RIDGE OF HIGH
PRESSURE WILL NOSE BACK INTO THE AREA OVER THE WEEKEND WITH ISOLATED
THUNDERSTORMS MAINLY CONFINED TO THE FAR SOUTH...EAST...NORTH AND
IN THE MOUNTAINS. OTHERWISE...IT WILL BE VERY WARM TO HOT WITH GUSTY
WINDS NEAR ANY THUNDERSTORMS.

&&

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

&&

SHORT TERM...SKRBAC
LONG TERM...LIPSON
AVIATION...LIPSON
FIRE WEATHER...SKRBAC

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
500 AM MDT FRI JUL 27 2012

WYZ001>020-022>030-281100-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST-
BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS-
EAST SWEETWATER COUNTY-FLAMING GORGE-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN-
NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS-
ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES-
SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN-
SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY-
TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN-
WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
500 AM MDT FRI JUL 27 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ACROSS THE HIGHER ELEVATIONS AND IN THE WEST
TODAY AND TONIGHT...WITH ISOLATED TO WIDELY SCATTERED THUNDERSTORMS
EXPECTED EAST OF THE DIVIDE AND IN THE LOWER ELEVATIONS. SOME OF THE
STORMS ARE CAPABLE OF PRODUCING WIND GUSTS IN EXCESS OF 50 MPH AND
FREQUENT CLOUD TO GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SUNDAY AND THURSDAY...ISOLATED THUNDERSTORMS ACROSS THE SOUTH AND
EAST.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT RAINFALL AMOUNTS AND ANY WIND
GUSTS GREATER THAN 40 MPH TO THE NATIONAL WEATHER SERVICE IN RIVERTON
AT 1-800-211-1448. THANK YOU.

TEAM RIVERTON

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
708 PM MDT FRI JUL 27 2012

WYZ003-004-008-280200-
BIGHORN MOUNTAINS WEST WY-CODY FOOTHILLS WY-NORTH BIG HORN BASIN WY-
708 PM MDT FRI JUL 27 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BIG HORN COUNTY IN
NORTH CENTRAL WYOMING...AND NORTHEASTERN PARK COUNTY IN NORTHWEST
WYOMING UNTIL 800 PM MDT...

AT 706 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 6 MILES NORTHWEST OF POWELL...MOVING EAST AT 30
MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
INFREQUENT LIGHTNING.

THIS STORM WILL BE NEAR...
PARK COUNTY FAIRGROUNDS AROUND 715 PM MDT.
GARLAND AROUND 720 PM MDT.
U.S. HWY 14A MILE MARKER 30 AROUND 725 PM MDT.
DEAVER AROUND 730 PM MDT.
BYRON AROUND 735 PM MDT.
COWLEY AND U.S. HWY 14A MILE MARKER 40 AROUND 740 PM MDT.
HWY 310/789 MILE MARKER 240 AND LOVELL AROUND 745 PM MDT.
U.S. HWY 14A MILE MARKER 50 AROUND 755 PM MDT.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4481 10801 4467 10893 4501 10905 4501 10820
TIME...MOT...LOC 0108Z 253DEG 28KT 4481 10883

BRANHAM