Flash Flood Warning 1, NWS Riverton, WY

373 
WGUS75 KRIW 180029
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
629 PM MDT FRI MAY 17 2013

WYC019-180037-
/O.CAN.KRIW.FF.W.0001.000000T0000Z-130518T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JOHNSON WY-
629 PM MDT FRI MAY 17 2013

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL JOHNSON
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

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

LAT...LON 4443 10729 4425 10718 4418 10759 4434 10770

$$

WYC003-180100-
/O.CON.KRIW.FF.W.0001.000000T0000Z-130518T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BIG HORN WY-
629 PM MDT FRI MAY 17 2013

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN BIG HORN
COUNTY IN NORTH CENTRAL WYOMING UNTIL 700 PM MDT...

AT 622 PM MDT...WEATHER SPOTTERS REPORTED THAT FLASH FLOODING WAS 
OCCURRING IN DRY WASHES AND ARROYOS IN AND AROUND MEDICINE LODGE 
STATE ARCHAEOLOGICAL SITE...A ROAD IN THE PARK HAS ALREADY BEEN 
WASHED OUT. MEDICINE LODGE CREEK AT THE TOWN OF HYATTVILLE HAS 
ALREADY CRESTED AND HAS REMAINED BELOW FLOOD STAGE. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...MEDICINE 
LODGE ARCHAEOLOGICAL SITE AND PAINTROCK CANYON...AS WELL AS THE DRY 
WASHES AND AROUND AND EAST OF THE SITE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOOD WATERS ARE MOVING DOWN TRIBUTARIES OF THE MEDICINE LODGE AND 
PAINT ROCK CREEKS. THE GAUGE AT MEDICINE LODGE CREEK NEAR HYATTVILLE 
HAS RISEN ONE FOOT OVER THE LAST HOUR...IT APPEARS TO HAVE CRESTED 
AT 2.97FT AND IS ON ITS WAY BACK DOWN...ACTION STAGE IS AT 4.5FT.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN RIVERTON.

&&

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

LAT...LON 4443 10729 4425 10718 4418 10759 4434 10770

$$

ALLEN

959 
WGUS75 KRIW 180100
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
700 PM MDT FRI MAY 17 2013

WYC003-180100-
/O.CON.KRIW.FF.W.0001.000000T0000Z-130518T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BIG HORN WY-
700 PM MDT FRI MAY 17 2013

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN BIG HORN
COUNTY IN NORTH CENTRAL WYOMING UNTIL 700 PM MDT...

AT 656 PM MDT...WEATHER SPOTTERS REPORTED THAT FLASH FLOODING WAS 
OCCURRING IN DRY WASHES AND ARROYOS IN AND AROUND MEDICINE LODGE 
STATE ARCHAEOLOGICAL SITE...A ROAD IN THE STATE ARCHAEOLOGICAL SITE 
HAS AREADY BEEN WASHED OUT. MEDICINE LODGE CREEK AT THE TOWN OF 
HAYATTVILLE HAS ALREAY CRESTED AND HAS REMAINED BELOW FLOOD STAGE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...MEDICINE 
LODGE ARCHAEOLOGICAL SITE AND PAINTROCK CANYON...AS WELL AS THE DRY 
WASHES IN AND EAST OF THE SITE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOOD WATERS ARE MOVING DOWN TRIBUTARIES OF THE MEDICINE LODGE AND 
PAINT ROCK CREEKS. THE GAUGE AT MEDICINE LODGE CREEK NEAR 
HAYATTVILLE HAS RISEN ONE FOOT OVER THE LAST HOUR...IT APPEARS TO 
HAVE CRESTED AT 2.97 FEET AND IS ON ITS WAY BACK DOWN...ACTION STAGE 
IS 4.5FT.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN RIVERTON.

&&

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

LAT...LON 4443 10729 4425 10718 4418 10759 4434 10770

$$

ALLEN

795 
WGUS75 KRIW 180107
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
707 PM MDT FRI MAY 17 2013

WYC003-180122-
/O.EXP.KRIW.FF.W.0001.000000T0000Z-130518T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BIG HORN WY-
707 PM MDT FRI MAY 17 2013

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHEASTERN BIG
HORN COUNTY IN NORTH CENTRAL WYOMING HAS BEEN ALLOWED TO EXPIRE...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

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

LAT...LON 4443 10729 4425 10718 4418 10759 4434 10770

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
359 PM MDT FRI MAY 17 2013

.SHORT TERM...TONIGHT THROUGH SATURDAY
TODAY...MORNING LINGERING SHOWERS OVER THE WRN AND NWRN BORDER
REGIONS THIS MORNING GIVING WAY TO SHOWERS WITH SOME THUNDER RUNNING
DIAGONALLY FROM THE EVANSTON AREA NE TO SHERIDAN. LOOKS A BIT SPLIT
AS FAR AS HIGH TEMPS GO TOO...THE 70 DEG DEMARCATION LINE RUNS FROM
AROUND ROCK SPRINGS WY ON THE SOUTH TO JUST WEST OF LOVELL WYO ON
THE NORTH WITH 50 TO 60 DEG HIGHS PREVALENT ACROSS THE MOUNTAINS.
LOWER MID AND UPPER 70S TO NEAR 80 WILL BE COMMON EAST OF THIS LINE.

SPLIT SHORTWAVE ACTIVITY...ONE EXITING NEAR NWRN TO NRN WY WITH
ANOTHER JUST MOVING INTO THE STATE FROM THE SW. BEST INSTABILITY
SHOWING UP NEAR THE SOUTHERN BIG HORNS AND INTERSECTION WITH THE OWL
CREEK RANGE...BOTH ML AND SFC. LINE BETWEEN THERMOPOLIS AND
EDGERTON...INCLUDING SOME OF HOT SPRINGS...WASHAKIE...AND JOHNSON
COUNTIES... LOOKS TO HAVE THE BEST ABILITY TO PRODUCE SOMEWHAT
STRONGER CONVECTION LATER IN THE DAY AS LL MOISTURE AND CONVERGENCE
WILL BE MAXIMIZED HERE...IN ADDITION TO H85 TO H5 SHEAR OF 35 TO 40
KTS. POSSIBLE MARGINAL SEVERE WITH HALF TO THREE QUARTER INCH HAIL
AND STRONG OUTFLOW WINDS. ADDITIONALLY...BIG HORN COUNTY MAY ALSO
GET OUTFLOW DOMINATED LINE TYPE CONVECTION AS T-STORMS DEVELOPING
OFF THE ABSOROKA MOUNTAINS MOVE THROUGH. AFTERNOON DCAPE VALUES ARE
HOVERING BETWEEN 600 AND 700 J/KG FOR MOST AREAS...WHICH WILL PUT
THE CONVECTIVE ACTIVITY TODAY IN A NARROW MARGINALLY SEVERE
WIND...UP TO 55 MPH...CATEGORY THIS AFTERNOON. ELSEWHERE...PRECIP
MODE WILL BE WEAK TO MODERATELY CONVECTIVE WITH RELATIVELY LOW
INSTABILITIES...BUT THE ELEVATED TERRAIN TOGETHER WITH STRONGER JET
LEVEL WINDS NEAR 80KTS FLOWING OVER THIS PART OF THE CWA WILL BE THE
PREFERRED AREA FOR EARLY INITIATION TODAY.

WRN CONUS TROF BECOMING MORE NEGATIVELY TILTED TODAY THROUGH
TOMORROW. AS IT DOES...WE WILL LOSE MUCH OF THE UPPER LEVEL
SUPPORT/FLOW...SHIFTING OVER FAR EASTERN CWA. ALSO...CLOUD COVER AND
COOL MOIST CONDITIONS OVER WESTERN 3/4RDS OF FA WILL KEEP OVERALL
INSTABILITY ON THE LOW SIDE COMPARED WITH TODAY. JOHNSON COUNTY
HOWEVER WILL ONCE AGAIN HAVE THE BEST SHOT AT PRODUCING STRONGER
THUNDER SATURDAY. OTHERWISE...EXPECT SCATTERED SHOWERS AND ISOLATED
THUNDER OVER MOST AREAS...WITH LESS PRCIP AND AREAL COVERAGE OVER
THE SOUTH CENTRAL AND SOUTHWEST CWA.

.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY
THE MAIN DIGGING NEGATIVELY TILTED TROUGH SHOULD BE OVER OUR CWA BY
SATURDAY NIGHT BEFORE CLOSING OFF BY 18Z SUNDAY. ON SATURDAY NIGHT
MOST OF THE PRECIP WILL BE CONFINED TO CENTRAL AND NORTHERN WYOMING.
THEN AS THE LOW CLOSES OFF OVER THE EASTERN HALF OF
WYOMING...MOISTURE AND COLD AIR WILL WRAP AROUND THE CLOSED LOW
SPREADING PRECIP INTO SOUTHERN WYOMING. THE COOLING TREND WILL
CONTINUE ON SUNDAY. H7 TEMPS WILL COOL DOWN TO BETWEEN -3 AND -4C IN
NW WYOMING BY SUNDAY WITH SNOW LEVELS GETTING DOWN TO 6500 FEET
THERE. ELSEWHERE...SNOW LEVELS SHOULD BE AROUND 8K. ON SUNDAY NIGHT
CYCLOGENESIS WILL TAKE PLACE AT H7 AND ABOVE OVER SOUTH DAKOTA WHICH
WILL DEEPEN THE NORTHERLY UPSLOPE FLOW EAST OF THE DIVIDE. THE
UPSLOPE COMPONENT WILL LOWER THE SNOW LEVEL DOWN TO 7500 FEET DUE TO
ADIABATIC COOLING ALONG THE EAST SLOPE OF THE WIND RIVER...ABSAROKA
AND BIG HORN MOUNTAINS SUNDAY NIGHT. CONVERSELY...SNOW LEVELS SHOULD
BE UP AS HIGH AS 9K ALONG THE WEST SLOPE OF THE WIND RIVER MTNS
SUNDAY NIGHT DUE TO DOWNSLOPE FLOW THERE. THESE SNOW LEVELS SHOULD
PERSIST THROUGH MONDAY WITH THE PRECIP BECOMING MORE STRATIFORM EAST
OF THE DIVIDE AS THE UPSLOPE DEEPENS. THE MOST SNOWFALL SHOULD FALL
ALONG THE EAST SLOPE OF THE WIND RIVER MTNS WHERE THE ORIENTATION OF
THE MOUNTAIN RANGE WILL BE BETTER SUITED TO FORCING THE NORTHERLY
FLOW INTO AN UPSLOPE COMPONENT WHERE AT LEAST 4 TO 5 INCHES OF SNOW
IS EXPECTED SUNDAY NIGHT INTO MONDAY. THE BIG HORN AND ABSAROKA MTNS
SHOULD SEE 2 TO 3 INCHES. ON MONDAY NIGHT THE PRECIP SHOULD START TO
WIND DOWN. ON TUESDAY A SHORT LIVED RIDGE OF HIGH PRESSURE WILL
PROVIDE A PRECIP FREE DAY AND SLIGHTLY MILDER TEMPS. THEN BY
WEDNESDAY A STRONG CLOSED LOW MIGRATING DOWN ALONG THE CANADIAN
PACIFIC COAST WILL SET UP SHOP OVER THE PACIFIC NORTHWEST. THE FIRST
SHORTWAVE THAT THIS CIRCULATION WILL EJECT TOWARD THE NORTHEAST WILL
PROVIDE A SHOT OF THUNDERSTORMS TO NW WYOMING FOR WEDNESDAY. A
SURFACE BASED SOUTHEAST FLOW PROVIDING AMPLE LOW LEVEL MOISTURE
COMBINING WITH INSTABILITY WILL RESULT IN THUNDERSTORM DEVELOPMENT
IN JOHNSON COUNTY AND THE BIG HORN MTNS AS WELL WEDNESDAY. THE NEXT
SUCH EJECTED SHORTWAVE WILL PROVIDE ANOTHER SHOT OF T STORMS FOR NW
WYOMING NEXT FRIDAY WITH SOUTHEAST SURFACE WINDS FEEDING LOW LEVEL
MOISTURE INTO JOHNSON COUNTY AND THE BIG HORN MOUNTAINS FOR
THUNDERSTORMS THERE AS WELL. THE SOUTHWEST STEERING FLOW OUT AHEAD
OF THIS CLOSED LOW IN THE PACIFIC NW WILL PROVIDE A WARMING TREND
FOR THE CWA THROUGH NEXT WEEK. THE EURO AND THE GFS BOTH SUPPORT
THIS TREND.

&&

.AVIATION.../00Z ISSUANCE/
SHOWERS CONTINUE ACROSS THE WEST TERMINAL AREA AS ANOTHER WAVE MOVES
OVERHEAD IN SOUTHWEST FLOW...KJAC HAS BEEN IN AND OUT OF MVFR TO IFR
CONDITIONS THROUGH THE MORNING WITH WIDESPREAD MOUNTAIN OBSCURATIONS
ONGOING. SOME CLEARING HAS TAKEN PLACE THIS MORNING AROUND KBPI AND
KPNA AS A RIDGE OF HIGH PRESSURE BATTLES THE TROF TO THE WEST.
TRICKY FORECAST AT KBPI AND KPNA AS THEY WILL LAY JUST ON THE
INFLECTION POINT BETWEEN THE TWO DIFFERING AIR MASSES.
HOWEVER...SHOWERS AND SOME STORMS WILL INCREASE IN COVERAGE AFTER
22Z...SO WILL KEEP VCTS AND VCSH IN FORECAST FOR THOSE TWO
TERMINALS. OTHERWISE...SHOWERS WILL CONTINUE ON AND OCCASIONALLY
OFF THROUGH THE TAF PERIOD AT KJAC AS A COLD FRONT PUSHES IN AND
STALLS IN ADDITION TO AN UPPER LEVEL SHORTWAVE MOVING OVERHEAD FOR MUCH OF
THE DAY.

AT ALL OTHER TERMINALS...SCATTERED CONVECTION IS EXPECTED TO RETURN
FROM NOW THROUGH THE EVENING TODAY EXCEPT KCPR AND KRKS WHERE MOSTLY
DRY SOUTHWEST WINDS COULD GUST AS HIGH AS 35 KTS IN THE AFTERNOON.
AN ISOLATED SHOWER OR TWO CANNOT BE RULED OUT NEAR KRKS IF THEY ARE
INITIATED OFF THE UNITAH MOUNTAINS. HOWEVER...OVERALL CONDITIONS ARE
NOT CONDUCIVE TO MAINTAINING THUNDERSTORMS FROM KRKS TO KCPR. STORMS
TODAY WILL FAVOR THE BIG HORN VALLEY AND ADJACENT MOUNTAINS...AND
THE WIND RIVER MOUNTAINS AND VALLEY SECONDLY. STORMS THAT DO FORM
WILL HAVE VERY GUSTY AND ERRATIC OUTFLOWS...ESPECIALLY FROM 18-00Z.
A COLD FRONT MOVES THROUGH FROM WEST TO EAST THROUGH THE FORECAST
PERIOD.

&&

.FIRE WEATHER...
ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS CONTINUE TODAY AS ANOTHER
COUPLE UPPER LEVEL DISTURBANCES MOVE THROUGH THE REGION...ESPECIALLY
ACROSS THE WESTERN HALF OF THE CWA. THESE STORMS WILL PRESNT AT
TIMES...BRIEF STRONG ERRATIC WINDS...SMALL HAIL AND OCCASSIONAL TO
FREQUENT LIGHTNING. AMBIENT WINDS WILL ALSO BECOME STRONG AND QUITE
GUSTY THIS AFTERNOON...ESPECIALLY ACROSS SWEETWATER AND NATRONA
COUNTIES...EAST OF A LINE FROM ROCK SPRINGS TO MUDDY GAP AND ONE TO
CASPER. AFTERNOON SHOWERS AND THUNDERSTORMS WILL CONTINUE FOR
SATURDAY AND SUNDAY...HOWEVER COOLER HIGH TEMPERATURES...MOSRE
MOISTURE IN THE AREA AND EXITING INSTABILITY - LESS CHANCES FOR
LIGHTNING SATURDAY AND SUNDAY - WILL LIMIT FIRE DANGERS THIS WEEKEND
AND INTO THE BEGINNING OF NEXT WEEK.

&&

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

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
500 AM MDT FRI MAY 17 2013

WYZ001>020-022>030-181200-
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 MAY 17 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS WILL OCCUR THIS AFTERNOON AND
EVENING...ESPECIALLY ACROSS THE WEST AND NORTH. A FEW OF THESE
STORMS HAVE THE POTENTIAL IN BECOMING QUITE STRONG TO EVEN
SEVERE...WITH STRONG WIND AND HAIL POSSIBLE. THE STRONGEST
THUNDERSTORMS ARE EXPECTED TO OCCUR ACROSS JOHNSON COUNTY LATE THIS
AFTERNOON INTO THE EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SATURDAY...ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE POSSIBLE
ACROSS MOST OF THE AREA.

SUNDAY AND MONDAY...A MUCH COLDER STORM SYSTEM IS EXPECTED TO DEVELOP
OVER THE ROCKIES POSSIBLY SPREADING AN UPSLOPE RAIN EVENT TO CENTRAL
WYOMING WITH SNOW IN THE MOUNTAINS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER INCLUDING
HAIL OF ANY SIZE...WINDS GREATER THAN 45 MPH...RAIN TOTALS OVER A
HALF AN INCH...ANY FLOODING...AS WELL AS ANY CREEKS OR STREAMS THAT
ARE BANKFULL OR RISING FAST. THANK YOU.

TEAM RIVERTON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
219 PM MDT FRI MAY 17 2013

WYZ002>007-017-172100-
ABSAROKA MOUNTAINS WY-CODY FOOTHILLS WY-NORTH BIG HORN BASIN WY-OWL
CREEK AND BRIDGER MOUNTAINS WY-SOUTHEAST BIG HORN BASIN WY-SOUTHWEST
BIG HORN BASIN WY-WIND RIVER BASIN WY-
219 PM MDT FRI MAY 17 2013

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN HOT SPRINGS AND NORTHERN
FREMONT COUNTIES IN CENTRAL WYOMING...AND SOUTHWESTERN BIG HORN AND
NORTHWESTERN WASHAKIE COUNTIES IN NORTH CENTRAL WYOMING...AND
SOUTHEASTERN PARK COUNTY IN NORTHWEST WYOMING UNTIL 300 PM MDT...

AT 213 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM STATE HWY 120 MILE
MARKER 50 TO 9 MILES SOUTH OF ANCHOR DAM...AND MOVING NORTHEAST AT 25
MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH FREQUENT DANGEROUS LIGHTNING.

THESE STORMS WILL BE NEAR...
OWL CREEK RD AND STATE HWY 120 MILE MARKER 40 AROUND 225 PM MDT.
GOOSEBERRY CREEK AROUND 230 PM MDT.
UPPER COTTONWOOD CREEK RD AND GRASS CREEK AROUND 235 PM MDT.
HWY JCT 431 AND 120...STATE HWY 431 MILE MARKER 30...LEGEND ROCK
STATE PETROGLYPH SITE AND HAMILTON DOME AROUND 245 PM MDT.
STATE HWY 171 AND STATE HWY 120 MILE MARKER 30 AROUND 250 PM MDT.
HWY JCT 170 AND 174 AND STATE HWY 170 MILE MARKER 10 AROUND 255 PM
MDT.
STATE HWY 120 MILE MARKER 20 AROUND 300 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 4448 10820 4374 10823 4341 10888 4415 10886
TIME...MOT...LOC 2019Z 234DEG 21KT 4411 10874 4356 10877

BRAUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
352 PM MDT FRI MAY 17 2013

WYZ009-011-172230-
BIGHORN MOUNTAINS SOUTHEAST WY-SOUTHEAST JOHNSON COUNTY WY-
352 PM MDT FRI MAY 17 2013

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

AT 351 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 14 MILES SOUTHWEST OF MAYOWORTH...OR 18 MILES
WEST OF KAYCEE...MOVING NORTHEAST AT 30 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
POSSIBLE WITH THIS STORM.

THIS STORM WILL BE NEAR...
STATE HWY 191 MILE MARKER 10 AND MAYOWORTH AROUND 415 PM MDT.

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 253 AND
263.

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

LAT...LON 4397 10676 4363 10654 4357 10704 4374 10711
TIME...MOT...LOC 2152Z 235DEG 25KT 4372 10698

JONES

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
416 PM MDT FRI MAY 17 2013

WYZ004-006-008-009-172245-
BIGHORN MOUNTAINS SOUTHEAST WY-BIGHORN MOUNTAINS WEST WY-NORTH BIG
HORN BASIN WY-SOUTHEAST BIG HORN BASIN WY-
416 PM MDT FRI MAY 17 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BIG HORN...
NORTHWESTERN JOHNSON AND NORTHERN WASHAKIE COUNTIES IN NORTH CENTRAL
WYOMING UNTIL 445 PM MDT...

AT 415 PM MDT...STORM SPOTTERS REPORTED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 7 MILES NORTHWEST OF MEDICINE LODGE
ARCHAEOLOGICAL SITE TO TEN SLEEP...AND MOVING NORTHEAST AT 40 MPH.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THESE STORMS...ALONG
WITH FREQUENT DANGEROUS LIGHTNING.

THESE STORMS WILL BE NEAR...
PAINTROCK CANYON AROUND 425 PM MDT.
MEADOWLARK LAKE AROUND 435 PM MDT.
CLOUD PEAK AROUND 445 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 4461 10741 4461 10739 4459 10737 4456 10736
      4456 10721 4428 10696 4405 10748 4439 10777
      4462 10742
TIME...MOT...LOC 2217Z 244DEG 34KT 4438 10762 4408 10744

ALLEN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
420 PM MDT FRI MAY 17 2013

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

0322 PM     FUNNEL CLOUD     12 W WORLAND            44.01N 108.20W
05/17/2013                   WASHAKIE           WY   FIRE DEPT/RESCUE

0339 PM     FUNNEL CLOUD     4 N WORLAND             44.06N 107.96W
05/17/2013                   WASHAKIE           WY   TRAINED SPOTTER

            ROTATING WALL CLOUD WAS ALSO OBSERVED.

0341 PM     HAIL             WINCHESTER              43.86N 108.16W
05/17/2013  M1.00 INCH       WASHAKIE           WY   TRAINED SPOTTER

            HAIL ACCUMULATED ONE INCH DEEP.

&&

DLIPSON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
442 PM MDT FRI MAY 17 2013

WYZ008>010-172315-
BIGHORN MOUNTAINS SOUTHEAST WY-BIGHORN MOUNTAINS WEST WY-NORTHEAST
JOHNSON COUNTY WY-
442 PM MDT FRI MAY 17 2013

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN BIG HORN AND NORTHWESTERN
JOHNSON COUNTIES IN NORTH CENTRAL WYOMING UNTIL 515 PM MDT...

AT 437 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES EAST OF U.S.
HWY 14 MILE MARKER 30 TO POWDER RIVER PASS...AND MOVING NORTHEAST AT
40 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN.

THESE STORMS WILL BE NEAR...
U.S. HWY 16 MILE MARKER 80 AROUND 450 PM MDT.
THE GILEAD FIRE BURN SCAR AT AROUND 455 PM MDT.
U.S. HWY 16 MILE MARKER 90...SADDLESTRING AND BUFFALO AROUND 505 PM
MDT.
JOHNSON COUNTY FAIRGROUNDS...I90 MILE MARKER 60...JCT I90 AND I25...
I90 EXIT 53...I90 EXIT 51...I90 EXIT 47...HWY JCT 87 AND I90...LAKE
DE SMET AND FORT PHIL KEARNY AROUND 510 PM MDT.
U.S. HWY 16 AROUND 515 PM MDT.

THIS INCLUDES INTERSTATE 90 IN WYOMING BETWEEN MILE MARKERS 43 AND
55.

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 4410 10703 4460 10756 4464 10749 4461 10745
      4461 10739 4456 10736 4457 10625
TIME...MOT...LOC 2242Z 235DEG 34KT 4459 10737 4423 10700

ALLEN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
450 PM MDT FRI MAY 17 2013

WYZ009>011-172330-
BIGHORN MOUNTAINS SOUTHEAST WY-NORTHEAST JOHNSON COUNTY WY-SOUTHEAST
JOHNSON COUNTY WY-
450 PM MDT FRI MAY 17 2013

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL JOHNSON COUNTY UNTIL 530
PM MDT...

AT 441 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR STATE HWY 196 MILE MARKER 270...OR 16 MILES
NORTH OF KAYCEE...MOVING NORTHEAST AT 25 MPH.

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

THIS STORM WILL BE NEAR...
STATE HWY 196 MILE MARKER 280 AROUND 500 PM MDT.
I25 EXIT 280 AROUND 505 PM MDT.

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 270 AND
288.

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

LAT...LON 4425 10651 4403 10623 4385 10666 4397 10682
TIME...MOT...LOC 2246Z 222DEG 20KT 4395 10668

JONES