Special Weather Statement, NWS Riverton, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
316 PM MDT TUE AUG 9 2011

.SHORT TERM...TONIGHT THROUGH FRIDAY

A SWATH OF MID AND UPPER LEVEL MOISTURE WITH PRECIPITABLE WATER
VALUES FROM 125 TO 150 PERCENT OF NORMAL FROM SATELLITE ESTIMATES
EXTENDS ACROSS THE NORTHERN HALF OF THE FORECAST AREA WITH DRY AIR
ACROSS THE SOUTH WITH VALUES OF 60 TO 75 PERCENT OF NORMAL. THE
NORTHERN MOISTURE IS ASSOCIATED WITH A SHORT WAVE TROUGH OVER
WESTERN MONTANA. WEAK UPPER LEVEL DIVERGENCE AND MODERATE
INSTABILITY SUPPORTING SHOWERS AND THUNDERSTORMS ACROSS THE NORTH.
A SERIES OF WEAK SHORT WAVE TROUGHS IN THE WESTERLY FLOW WILL
KEEP SOME SHOWERS AND ISOLATED THUNDERSTORMS GOING THROUGH THE
NIGHT AND INTO WEDNESDAY MORNING. THE MOISTURE IS EXPECTED TO
SHIFT NORTH LIMITING CONVECTION NORTH OF THE OWL CREEK MOUNTAINS
AND THE SOUTHERN BIGHORN MOUNTAINS. TEMPERATURES WILL WARM SLIGHTLY.
THE MOISTURE WILL SHIFT NORTH OF THE AREA WITH DRY AND MORE STABLE
AIR IN PLACE FOR THURSDAY AND FRIDAY. ISOLATED SHOWERS AND
THUNDERSTORMS WILL BRUSH THE NORTHERN MOUNTAINS ON THURSDAY.
BREEZY WEST WINDS WILL INCREASE ACROSS THE AREA THURSDAY AND
FRIDAY.

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY

RIDGE OF HIGH PRESSURE WILL REMAIN OVER THE CWA
THROUGH SATURDAY EVENING WITH GENERALLY DRY CONDITIONS AND LIGHT
WIND EXPECTED. THE AXIS OF THE RIDGE WILL SLIDE EAST SUNDAY
MORNING...ALLOWING SOME MONSOONAL MOISTURE TO BEGIN ITS RETURN TO
CENTRAL AND WESTERN WYOMING. THIS ADDITIONAL MOISTURE WILL BRING
ISOLATED SHOWERS AND THUNDERSTORMS ACROSS THE AREA FOR SUNDAY
AFTERNOON...ALONG WITH INCREASED SURFACE WINDS.

THE SOUTHWEST FLOW ASSOCIATED WITH THIS PATTERN WILL REMAIN OVER THE
AREA THROUGH TUESDAY EVENING. THIS WILL KEEP THE RETURN OF MONSOONAL
MOISTURE AND CONTINUED AFTERNOON SHOWERS AND THUNDERSTORMS ACROSS
THE FORECAST AREA. EMBEDDED DISTURBANCES IN THE FLOW WILL ALSO AID
TO DEVELOPING SHOWERS AND THUNDERSTORMS.

TEMPERATURES CONTINUE TO WARM THROUGH SUNDAY UNDER THE RIDGE...WITH
A SLIGHT COOL DOWN ANTICIPATED MONDAY AND TUESDAY.

&&

.AVIATION...

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO IMPACT AIRPORTS IN THE
NORTHERN THIRD OF THE FORECAST AREA THROUGH THE OVERNIGHT HOURS
IMPACTING KCOD...KWRL...KGEY AND KBYG. SHOWER COVERAGE WILL BEGIN TO
DECEASE AFTER 06Z. ISOLATED SHOWERS AND THUNDERSTORMS WILL CONTINUE
OT IMPACT THE ABSAROKA MOUNTAINS...BIGHORN MOUNTAINS AND JOHNSON
COUNTIES THROUGH 18Z. A WEAK DISTURBANCE WILL COMBINE WITH SOME
RESIDUAL MOISTURE TO CONTINUE WITH SHOWERS AND THUNDERSTORMS ACROSS
THE NORTHERN THIRD OF THE FORECAST AREA THROUGH WEDNESDAY AFTERNOON
AND INTO THE EVENING. ANY SHOWER ACTIVITY WILL BRING THE POTENTIAL
FOR MVFR CONDITIONS...WITH IFR CONDITIONS POSSIBLE IN HEAVY RAIN.
ANY STORM ACTIVITY WILL CONTAIN POTENTIAL THREATS OF GUSTY WIND TO
40 KTS...SMALL HAIL...DANGEROUS LIGHTNING AND PERIODS OF HEAVY
RAINFALL. LIGHT WIND GENERALLY EXPECTED OUTSIDE OF STORM
ENVIRONMENTS...WITH WIND INCREASING ACROSS SOUTHERN AND WESTERN
WYOMING AFTER 18Z WEDNESDAY. THESE INCREASED WINDS WILL IMPACT
AIRPORTS WEST AND SOUTH OF A LINE FROM KCPR-KLND-KCOD.

&&

.FIRE WEATHER...

ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL REMAIN OVER THE
NORTHERN PART OF THE FORECAST AREA THROUGH THE EVENING HOURS
TONIGHT. SHOWER ACTIVITY MAY CONTAIN GUSTY AND ERRATIC WIND TO 45
MPH...SMALL HAIL AND DANGEROUS LIGHTNING. SHOWER ACTIVITY IS
EXPECTED TO DECREASE AFTER MIDNIGHT...WITH GENERALLY DRY
CONDITIONS EXPECTED BY WEDNESDAY MORNING. TO THE SOUTH...DRY AND
BREEZY CONDITIONS WILL EXIST.  WARMING TEMPERATURES EXPECTED OVER
THE AREA FOR WEDNESDAY. A WEAK DISTURBANCE WILL MOVE ACROSS
NORTHERN WYOMING AGAIN ON WEDNESDAY AFTERNOON WHICH MAY GENERATE A
COUPLE SHOWERS AND THUNDERSTORMS ACROSS THE NORTH...WITH DRY
CONDITIONS IN CENTRAL AND SOUTHERN AREAS. THIS PATTERN WILL
CONTINUE THROUGH THURSDAY ACROSS THE DISPATCH AREA.

&&

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

SHORT TERM...C.BAKER
LONG TERM...BRANHAM
AVIATION...BRANHAM
FIRE WEATHER...C.BAKER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
400 AM MDT TUE AUG 9 2011

WYZ001>020-022>030-101200-
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-
400 AM MDT TUE AUG 9 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS NORTHERN AND
CENTRAL WYOMING AND THE FAR WEST. HEAVY RAIN...LIGHTNING AND GUSTY
WINDS ARE LIKELY HAZARDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED THUNDERSTORMS REMAIN POSSIBLE MAINLY OVER THE NORTH
WEDNESDAY AND THURSDAY.

AFTER A DRY PERIOD FRIDAY AND SATURDAY...ISOLATED THUNDERSTORMS WILL
RETURN TO THE WEST SUNDAY AFTERNOON AND ACROSS THE NORTH SUNDAY
NIGHT. THEN WIDELY SCATTERED THUNDERSTORMS WILL OCCUR MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ASKED TO REPORT HAIL SIZE AND STRONG WIND GUSTS AS WELL
AS ANY DAMAGE. THANK YOU.

TEAM RIVERTON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
143 PM MDT TUE AUG 9 2011

WYZ001-012>016-092200-
JACKSON HOLE-TETON AND GROS VENTRE MOUNTAINS-UPPER WIND RIVER BASIN-
WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
143 PM MDT TUE AUG 9 2011

...SCATTERED SHOWERS AND THUNDERSTORM ACROSS NORTHWEST WYOMING...

THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS NORTHWEST WYOMING THIS
AFTERNOON. STORMS WILL MOVE EAST AT 25 TO 30 MPH. THE PRIMARY THREATS
WITH THESE STORMS WILL BE WINDS GUSTING TO 50 MPH...BRIEF HEAVY
RAIN...AND DANGEROUS LIGHTNING. SMALL HAIL IS ALSO POSSIBLE WITH
THESE STORMS. PEOLPE PLANNING OUTDOOR ACTIVITES SHOULD BE PREPARED
TO MOVE TO A SAFE LOCATION WHEN STORMS APPROACH.

WOLCOTT

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
318 PM MDT TUE AUG 09 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0234 PM     HAIL             6 NNE THERMOPOLIS       43.73N 108.17W
08/09/2011  M1.00 INCH       HOT SPRINGS        WY   TRAINED SPOTTER

0235 PM     HAIL             4 NNE THERMOPOLIS       43.71N 108.18W
08/09/2011  M0.75 INCH       HOT SPRINGS        WY   TRAINED SPOTTER

0240 PM     HAIL             1 NNW LUCERNE           43.75N 108.18W
08/09/2011  M1.00 INCH       HOT SPRINGS        WY   TRAINED SPOTTER

&&

WOLCOTT

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
322 PM MDT TUE AUG 9 2011

WYZ002-003-005>007-092200-
ABSAROKA MOUNTAINS WY-CODY FOOTHILLS WY-OWL CREEK AND BRIDGER
MOUNTAINS WY-SOUTHEAST BIG HORN BASIN WY-SOUTHWEST BIG HORN BASIN WY-
322 PM MDT TUE AUG 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR EXTREME WESTERN WASHAKIE...
WESTERN HOT SPRINGS AND EXTREME SOUTHEASTERN PARK COUNTIES UNTIL 400
PM MDT...

AT 318 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 14 MILES NORTHEAST OF WASHAKIE NEEDLES...OR 21
MILES SOUTH OF MEETEETSE...MOVING EAST AT 20 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

THIS STORM WILL BE NEAR...
GRASS CREEK AND STATE HWY 171 AROUND 400 PM MDT.

BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES
AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A
FLOODED ROADWAY.

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

LAT...LON 4407 10848 4354 10840 4376 10906 4394 10909
TIME...MOT...LOC 2122Z 264DEG 19KT 4386 10894

BRANHAM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
325 PM MDT TUE AUG 9 2011

WYZ017>020-022-100000-
CASPER MOUNTAIN-GREEN MOUNTAINS AND RATTLESNAKE RANGE-
LANDER FOOTHILLS-NATRONA COUNTY LOWER ELEVATIONS-WIND RIVER BASIN-
325 PM MDT TUE AUG 9 2011

...SCATTERED SHOWERS AND THUNDERSTORM ACROSS CENTRAL WYOMING...

THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS CENTRAL WYOMING THIS
AFTERNOON AND EVENING...ESPECIALLY AROUND THE BORDER BETWEEN FREMONT
AND NATRONA COUNTIES. STORMS WILL MOVE EAST AT 25 TO 30 MPH. THE
PRIMARY THREATS WITH THESE STORMS WILL BE WINDS GUSTING TO 50 MPH...
BRIEF HEAVY RAIN...SMALL HAIL...AND DANGEROUS LIGHTNING. PEOPLE
PLANNING OUTDOOR ACTIVITIES SHOULD BE PREPARED TO MOVE TO A SAFE
LOCATION WHEN STORMS APPROACH.

WOLCOTT

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
355 PM MDT TUE AUG 9 2011

WYZ009-011-092230-
BIGHORN MOUNTAINS SOUTHEAST WY-SOUTHEAST JOHNSON COUNTY WY-
355 PM MDT TUE AUG 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN JOHNSON COUNTY UNTIL
430 PM MDT...

AT 354 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 13 MILES WEST OF MAYOWORTH...OR 21 MILES WEST OF
KAYCEE...MOVING EAST AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

THIS STORM WILL BE NEAR...
STATE HWY 191 MILE MARKER 10 AND MAYOWORTH AROUND 425 PM MDT.
STATE HWY 190 MILE MARKER 100 AROUND 430 PM MDT.

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

BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES
AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A
FLOODED ROADWAY.

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

LAT...LON 4387 10665 4351 10666 4367 10711 4386 10711
TIME...MOT...LOC 2155Z 271DEG 22KT 4377 10704

WOLCOTT