Severe Thunderstorm Warning 40, NWS Riverton, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
331 PM MDT TUE JUN 16 2015

.SHORT TERM...TONIGHT THROUGH WEDNESDAY

A POTENTIALLY BUSY EVENING IS STILL BEING PLANNED FOR THIS EVENING.
SHOWERS AND THUNDERSTORMS CONTINUE TO MOVE THROUGH NORTHERN WYOMING
THIS AFTERNOON. SOME STORMS HAVE BEEN IMPRESSIVE ON RADAR...THOUGH
GROUND TRUTH OPPORTUNITIES HAVE BEEN SPARSE. REGARDLESS...THE
ENVIRONMENT IS STILL FAVORABLE FOR POTENTIALLY STRONG STORMS TO
DEVELOP TODAY...WITH THREATS OF HAIL...HEAVY RAIN...AND STRONG WIND.
SOME STORMS MAY BECOME SEVERE AS THE DAY CONTINUES.

STORMS WILL PERSIST THROUGH THE EVENING HOURS...WITH ACTIVITY
BEGINNING TO WEAKEN AFTER MIDNIGHT. SOME SHOWERS WILL LAST OVER THE
NORTHWESTERN MOUNTAINS THROUGH THE OVERNIGHT HOURS...WITH LIMITED
ACTIVITY ANTICIPATED DURING THE EARLY-MID MORNING HOURS. SHOWERS AND
THUNDERSTORMS ARE AGAIN POSSIBLE ACROSS NORTHERN WYOMING WEDNESDAY
AFTERNOON...AS MOISTURE IS PUSHED INTO THE IMPACTED AREA. GUSTY WIND
AND SMALL HAIL WILL BE THE THREAT. THE PUSH OF ASSOCIATED MOISTURE
DOES NOT LOOK OVERLY SUPPORTIVE FOR ANY PROLONGED TORRENTIAL RAIN
ACTIVITY...THOUGH PERIODS OF HEAVY RAIN ARE POSSIBLE.

.LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY NIGHT

ZONAL WESTERLY FLOW WITH WEAK RIDGING OVER THE WESTERN U.S. WILL
BRING A WARMING AND DRYING TREND TO WESTERN AND CENTRAL WYOMING.
CONVECTION SHOULD BE LIMITED TO THE NORTH AND NORTHWEST...WITH
SHOWERS AND THUNDERSTORMS MOST NUMEROUS IN THE MOUNTAINS. WITH
FEWER CLOUDS AND LESS LOW LEVEL MOISTURE...TEMPERATURES WILL WARM
WITH LOWER 90S IN THE BIGHORN BASIN AND NORTHERN WIND RIVER
BASIN...AND 80S ACROSS THE REST OF THE LOWER ELEVATIONS. THE
MOUNTAINS WILL HAVE TEMPERATURES IN THE MID 60S TO UPPER 70S.
SOME OF THE THUNDERSTORMS IN THE FAR NORTH WILL HAVE THE POTENTIAL
FOR HAIL AND STRONG WIND GUSTS.

THIS TREND WILL CONTINUE INTO THE WEEKEND...WITH FRIDAY AND
SATURDAY BEING THE LAST BEST CHANCES FOR PRECIPITATION THROUGH THE
REST OF THE FORECAST PERIOD. THESE CHANCES WILL BE CONFINED TO
NORTHERN PORTIONS AND JOHNSON COUNTY. THE REST OF THE PERIOD WILL
BE DOMINATED BY ZONAL FLOW...WITH PERIODS OF SHORTWAVE RIDGING.
THE LOW OVER BRITISH COLUMBIA WILL DETERMINE THE TIMING OF THESE
RIDGES...AS THE REGION WILL BE SQUEEZED BETWEEN THIS LOW AND A
BROAD AREA OF HIGH PRESSURE THAT WILL SETTLE OVER THE FOUR CORNERS
AND SOUTHERN ROCKIES. OVERALL...DRY AND WARM WEATHER WILL DOMINATE
THE WEATHER OVER THE COWBOY STATE NEXT WEEK. WILL HAVE TO MONITOR
HAVE FAST THE VEGETATION STARTS TO CURE.

&&

.AVIATION.../00Z ISSUANCE/

SHOWERS AND THUNDERSTORMS WILL BE PRESENT INTO THIS EVENING...MAINLY
ACROSS THE NORTHERN AND CENTRAL TERMINALS. THIS INCLUDES TERMINALS
NORTH OF A LINE FROM KCPR-KLND-KJAC. VERY STRONG WIND MAY
ACCOMPANY STORMS ACROSS THE NORTHERN TERMINALS...ALONG WITH LARGE
HAIL AND FREQUENT LIGHTNING. ADDITIONAL LOCATIONS MAY SEE SOME
THUNDERSTORM ACTIVITY...MAINLY KRKS. STORMS ARE NOT CURRENTLY
ANTICIPATED TO BE AS STRONG THERE. MOST ACTIVITY SHOULD WANE WITH
LOSS OF DAYLIGHT...WITH MOST ACTIVITY EXPECTED TO END AROUND 06Z.
A GENERALLY QUIET OVERNIGHT PERIOD IS THEN EXPECTED ACROSS THE
AREA. SOME VCFG MAY DEVELOP ACROSS AREAS RECEIVING RAINFALL TODAY.
MOUNTAIN PASSES MAY BE TURBULENT TODAY WITH NEARBY
CONVECTION...WITH MOUNTAINS SEEING THE POTENTIAL FOR SHOWERS LAST
FURTHER INTO THE NIGHTTIME HOURS. ADDTIONAL SHOWERS AND
THUNDERSTORMS MAY DEVELOP AFTER 18Z WEDNESDAY.
&&

.FIRE WEATHER...

SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS EVENING...MAINLY ACROSS
NORTHERN AND CENTRAL WYOMING. GUSTY AND ERRATIC WIND..HAIL...AND
LIGHTNING WILL REMAIN THREATS WITH ANY CONTINUED STORM ACTIVITY.
TEMPERATURES WILL CONTINUE TO WARM OVER THE NEXT COUPLE OF
DAYS...WITH DAYTIME HUMIDITY DECREASING ACROSS SOUTHERN WYOMING.
PERIODS OF GUSTY WIND WILL ALSO BE POSSIBLE DURING THE AFTERNOON
HOURS...MAINLY ACROSS SOUTHERN WYOMING. HOWEVER...PAST RAINFALL
AMOUNTS HAVE CONTINUED TO KEEP FUELS FROM GOING CRITICAL...SO FIRE
BEHAVIOR IS STILL NOT EXPECTED TO BE HAZARDOUS.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL MIDNIGHT MDT TONIGHT FOR WYZ002>011-
015>020-022.

&&

SHORT TERM...BRANHAM
LONG TERM...C.BAKER/LAVOIE
AVIATION...HATTINGS
FIRE WEATHER...BRANHAM

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
321 AM MDT TUE JUN 16 2015

WYZ001>020-022>030-171200-
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS-
NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN-
SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE-
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY-
SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS-
UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY-
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY-
321 AM MDT TUE JUN 16 2015

...FLASH FLOOD WATCH FOR NORTHERN AND CENTRAL WYOMING ALONG AND
EAST OF THE CONTINENTAL DIVIDE THROUGH 12 MIDNIGHT TONIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS ACROSS NORTHERN AND CENTRAL
WYOMING. A FEW STRONG TO SEVERE THUNDERSTORMS WILL AGAIN BE
POSSIBLE...ESPECIALLY OVER NATRONA COUNTY. SOME STRONGER STORMS
WILL CONTAIN VERY HEAVY RAIN WHICH WILL HAVE THE POTENTIAL TO
PRODUCE FLASH FLOODING.

HIGH WATER HAS BEEN OBSERVED IN THE BIGHORN RIVER NEAR
WORLAND...WIND RIVER NEAR RIVERTON...SOUTH FORK OF THE SHOSHONE
RIVER...AND THE GREEN RIVER NEAR LA BARGE. RIVERS ARE EXPECTED TO
CONTINUE TO GRADUALLY RECEDE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY

WEDNESDAY AND THURSDAY...ISOLATED AFTERNOON AND EVENING
THUNDERSTORMS ACROSS NORTHERN WYOMING.

FRIDAY AND SATURDAY...ISOLATED TO LOCALLY SCATTERED THUNDERSTORMS
ALONG AND EAST OF THE DIVIDE.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY FLOODING...RIVERS OUT OF THEIR
BANKS...OR NORMALLY DRY WASHES RUNNING WITH WATER. SPOTTERS ARE ALSO
ENCOURAGED TO REPORT HEAVY RAIN...HAIL OF ANY SIZE...AND DAMAGING
WIND GUSTS. THANK YOU.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
352 PM MDT TUE JUN 16 2015

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

0225 PM     HAIL             3 NNW U.S. HWY 20/789 M 43.53N 108.18W
06/16/2015  E2.50 INCH       HOT SPRINGS        WY   PUBLIC

            PICTURE POSTED ON FACEBOOK WITH DAMAGED WINDSHIELD

0312 PM     HAIL             5 N LYSITE              43.32N 107.71W
06/16/2015  M0.88 INCH       FREMONT            WY   PUBLIC

0323 PM     FUNNEL CLOUD     3 E LOST CABIN          43.28N 107.57W
06/16/2015                   FREMONT            WY   PUBLIC

&&

TL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
354 PM MDT TUE JUN 16 2015

WYZ002-003-162245-
CODY FOOTHILLS-ABSAROKA MOUNTAINS-
354 PM MDT TUE JUN 16 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PARK COUNTY UNTIL
445 PM MDT...

AT 353 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
SUNLIGHT BASIN...WHICH IS 24 MILES NORTHEAST OF EAST ENTRANCE...
MOVING EAST AT 40 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  SUNLIGHT BASIN AROUND 400 PM MDT.
  DEAD INDIAN PASS AROUND 410 PM MDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE REEF CREEK
CAMPGROUND...LITTLE SUNLIGHT CAMPGROUND...GREEN CREEK INN AND RV
PARK...BUFFALO BILL DAM VISITOR CENTER...RIVER REST RESORT...BROKEN H
LODGE...WAPITI SCHOOL...BUFFALO BILL U S BUREAU OF RECLAMATION POWER
PLANT...SHOSHONE U S BUREAU OF RECLAMATION POWER PLANT AND HUNTER
PEAK CAMPGROUND.

#

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN RIVERTON.

&&

LAT...LON 4489 10893 4436 10925 4462 10990 4467 10987
      4470 10983 4472 10983 4473 10985 4489 10978
TIME...MOT...LOC 2153Z 275DEG 33KT 4472 10963

BAKER

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
357 PM MDT TUE JUN 16 2015

WYZ029-162230-
FLAMING GORGE-
357 PM MDT TUE JUN 16 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL SWEETWATER COUNTY
UNTIL 430 PM MDT...

AT 356 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
SQUAW HOLLOW BOAT RAMP ON FLAMING GORGE...WHICH IS 10 MILES NORTHEAST
OF MANILA...MOVING NORTHEAST AT 25 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  SQUAW HOLLOW BOAT RAMP ON FLAMING GORGE AROUND 405 PM MDT.
  LOWE CANYON AROUND 410 PM MDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE FLAMING GORGE NATIONAL
RECREATION AREA.

#

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

IF ON OR NEAR FLAMING GORGE RESERVOIR...GET OUT OF THE WATER AND
MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE
OUT TO 15 MILES FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR
THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO
SAFE SHELTER NOW. DO NOT BE CAUGHT ON THE WATER IN A THUNDERSTORM.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FOR
SOUTH CENTRAL WYOMING.

LAT...LON 4110 10971 4115 10971 4117 10968 4132 10934
      4108 10917 4100 10945 4100 10962
TIME...MOT...LOC 2156Z 241DEG 20KT 4108 10956

TL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
404 PM MDT TUE JUN 16 2015

WYZ016-017-162245-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-
404 PM MDT TUE JUN 16 2015

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FREMONT COUNTY UNTIL 445
PM MDT...

AT 403 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
DIVERSION DAM REST AREA...WHICH IS 13 MILES WEST OF PAVILLION...
MOVING SOUTHEAST AT 25 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  PAVILLION...MORTON AND PILOT BUTTE RESERVOIR AROUND 430 PM MDT.
  KINNEAR AROUND 440 PM MDT.
  OCEAN LAKE AROUND 445 PM MDT.

OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE PAVILLION NATURAL GAS
PROCESSING PLANT...BULL LAKE LODGE AND PILOT BUTTE U S BUREAU OF
RECLAMATION POWER PLANT.

#

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
OFFICE IN RIVERTON.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FOR
CENTRAL WYOMING. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT
UNTIL 900 PM MDT FOR CENTRAL WYOMING.

LAT...LON 4327 10910 4341 10895 4325 10848 4301 10880
TIME...MOT...LOC 2203Z 306DEG 23KT 4330 10894

BAKER

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