Flash Flood Warning 5, NWS Riverton, WY

045 
WGUS75 KRIW 182036
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
236 PM MDT THU AUG 18 2016

WYC013-182315-
/O.CON.KRIW.FF.W.0005.000000T0000Z-160818T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FREMONT-
236 PM MDT THU AUG 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
SOUTHEASTERN FREMONT COUNTY...

AT 235 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEASTERN
FREMONT COUNTY.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4285 10771 4267 10767 4268 10808 4292 10806

$$

BRAUN

241 
WGUS75 KRIW 182055
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
255 PM MDT THU AUG 18 2016

WYC013-182315-
/O.CON.KRIW.FF.W.0005.000000T0000Z-160818T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FREMONT-
255 PM MDT THU AUG 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
SOUTHEASTERN FREMONT COUNTY...

AT 254 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEASTERN
FREMONT COUNTY.

ADDITIONAL RAINFALL AMOUNTS OF AN INCH ARE POSSIBLE IN THE WARNED
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4285 10771 4267 10767 4268 10808 4292 10806

$$

BRAUN

814 
WGUS75 KRIW 182124
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
324 PM MDT THU AUG 18 2016

WYC013-182315-
/O.CON.KRIW.FF.W.0005.000000T0000Z-160818T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FREMONT-
324 PM MDT THU AUG 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
SOUTHEASTERN FREMONT COUNTY...

AT 323 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEASTERN
FREMONT COUNTY.

ADDITIONAL RAINFALL AMOUNTS OF A HALF INCH ARE POSSIBLE IN THE
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4285 10771 4267 10767 4268 10808 4292 10806

$$

BRAUN

936 
WGUS75 KRIW 182159
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
359 PM MDT THU AUG 18 2016

WYC013-182315-
/O.CON.KRIW.FF.W.0005.000000T0000Z-160818T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FREMONT-
359 PM MDT THU AUG 18 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
SOUTHEASTERN FREMONT COUNTY...

AT 359 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

FLASH FLOODING WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEASTERN
FREMONT COUNTY.

ADDITIONAL RAINFALL AMOUNTS OF QUARTER INCH ARE POSSIBLE IN THE
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4285 10771 4267 10767 4268 10808 4292 10806

$$

BRAUN

408 
WGUS75 KRIW 182309
FFSRIW

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
509 PM MDT THU AUG 18 2016

WYC013-182318-
/O.EXP.KRIW.FF.W.0005.000000T0000Z-160818T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FREMONT-
509 PM MDT THU AUG 18 2016

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN FREMONT COUNTY WILL
EXPIRE AT 515 PM MDT...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY ROADS THAT MAY HAVE BEEN
IMPACTED BY HIGH WATER.

LAT...LON 4285 10771 4267 10767 4268 10808 4292 10806

$$

AR

Area Forecast Discussion
National Weather Service Riverton WY
123 PM MDT THU AUG 18 2016

.SHORT TERM..Tonight through Friday

Imagery shows large broad trough cross the western CONUS from
east to west with the axis located from northeastern MT through
central WY and southwest into central CA. Best upper dynamics with
this trough cuirrently located from eastern MT and across WY.
Surface has lee surface trough across eastern WY with cold front
sagging into northern WY.

As the main western trough continues to move across the FA and
the cold front pushes southward through northern WY and into
central WY, colder air aloft overflowing WY will allow widespread
modest instability showers and some thunderstorms to form both
along and behind the front. This will be followed by seasonally
deep (to H7) upslope flow into the area later this afternoon.
Relatively weak instability with this fall-like system and backing
winds aloft will limit storm strength with the strongest
thunderstorms likely found near and behind the front (max shear of
25 - 35 kts and CAPE from 700 to 1100 j/kg) as it plows south
through the day. As it looks now, stronger storms will be possible
from southern Johnson county and south and west across Natrona,
Fremont, Washakie and Hot Springs counties this afternoon. Hail,
wind and brief heavy rain will be the main threats from these
storms with a few approaching strong to severe limits.

Tonight, some brief drying and breaking of skies ahead of the next
and stronger cold front being pushed into the area by a strong upper
level shortwave moving down the backside of the main upper trough.
The front should enter the northwest corner of WY after midnight
with increasing precip/showers following it into the FA. By 12z
the front will begin to cross into central WY with rather
widespread precipitation and embedded showers east of the Divide
through the morning. By afternoon, showers with a few embedded
thunderstorms will be located mainly from eastern Fremont and
across Natrona county. Small hail and gusty winds in addition to
periods of heavy rain will be the main threat.

.LONG TERM...Friday night through Thursday

The showers and thunderstorms from the strong cold front that
moved through on Friday should be ending on Friday evening. All of
the models have trended drier so we reduced POPS in the evening
and removed them for later Friday night. Saturday at this point
looks like a dry day so we dried things out for that time period
as well. With more sunshine expected for Saturday as well, we have
raised high temperatures a few degrees and they may need to be
raised some more if trends continue. Ridging will dominate the
weather for Sunday and bring a pleasant day with seasonable
temperatures along with a good deal of sunshine with little or no
chance of rain.

A plume of monsoonal moisture will then move northward into areas
west of the Divide for Monday and bring a return to mainly higher
elevation showers and thunderstorms. Mainly dry conditions are
expected to continue East of the Divide. There could be a rise in
Fire Danger for Monday as well. The relative humidity will likely be
low enough, but wind right now is borderline.

The next cold front will then swing through Tuesday into Tuesday
night. This front has little moisture to work and not a lot of
energy so the forecast looks to be mainly dry. Further out, we have
similar issues that we raised by the overnight shift with the GFS
having mainly diurnal higher elevation convection with zonal flow
and the European bringing down another system for Friday. Like
before, with the uncertainty we made few changes to continuity.&&

.AVIATION.../00Z ISSUANCE

West of the Continental Divide...KJAC/KBPI/KPNA/KRKS

An upper level low pressure system will continue crossing the
Wyoming today, combining with a southward moving cold front to
produce scattered showers and isolated thunderstorms across the area
this evening. Brief MVFR conditions in lower cigs, heavy rain, small
hail and wind gusts 25-35kts will be possible with the stronger
storms. Drier air, decreasing showers and storms will occur from
north to south late this evening. LCL MVFR/IFR ceilings may linger
with this clearing. Another strong cold front will push south across
Yellowstone National Park and the Absaroka mountains to VCNTY KJAC
12z-15z spreading areas of MVFR -SHRA and gusty north to northeast
winds into northwest Wyoming through the morning hours before
clearing out in the afternoon.

East of the Continental Divide...KCOD/KCPR/KLND/KRIW/KWRL

A cold front will continue to push south across the area tonight,
with scattered showers and isolated thunderstorms expected to spread
south of a KLND-KCPR line by around after 03z. Scattered showers and
thunderstorms will continue through the evening with a few strong
storms producing brief MVFR/IFR conditions with lower cigs, heavy
rain, small hail and wind gusts 30-40kts. A brief window of clearing
will occur from north to south later this evening into early Friday
morning with some lingering areas of MVFR/IFR ceilings and perhaps
patchy fog. A stronger cold front will push south across the Montana
border around 09z Friday, spreading numerous MVFR showers and
isolated thunderstorms south to a VCNTY KRIW-KCPR-KBYG line after
15z.  A gusty north to northeast wind wind will accompany the front
through the morning hours before beginning to clear out of the
area late in the afternoon.

&&

.FIRE WEATHER...

Fire weather conditions moderate most locations with localized
elevated across portions of southwest WY. RH values will range from
the mid 20s to 60 percent for most of the area except the far
southwest which will still drop into teens. Through the day today
and again Friday the area will see a drastic change in the weather
as an early fall type weather system impacts Wyoming. A large upper
level trough will push across WY along with a couple of cold fronts,
shifting the winds out of the north to northeast, greatly decreasing
temperatures and increasing precipitation chances across the entire
forecast area. Many northern mountain locations will pick up between
a quarter of an inch and a half an inch of precipitation through
Friday with accumulating snow possible overnight tonight through
Friday morning mainly above 8500 feet. Otherwise warming and drying
expected once again over the weekend with possible elevated fire
weather conditions across southern WY on Monday.
&&

.RIW Watches/Warnings/Advisories...
&&

SHORT TERM...Braun
LONG TERM...Hattings
AVIATION...Braun
FIRE WEATHER...Braun

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
252 AM MDT THU AUG 18 2016

WYZ001>020-022>030-191200-
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-
252 AM MDT THU AUG 18 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT MOVING THROUGH THE AREA WILL BRING SHOWERS AND
THUNDERSTORMS ACROSS THE AREA TODAY. SOME STORMS MAY BECOME
STRONG WITH HAIL AND GUSTY WIND THROUGH THE EVENING HOURS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

FRIDAY...ANOTHER COLD FRONT WILL MOVE THROUGH PORTIONS OF EASTERN
AND CENTRAL WYOMING. SHOWERS AND THUNDERSTORMS WILL BE FOUND IN
THE AFTERNOON WITH GUSTY WIND AND HAIL REMAINING POSSIBLE.

ALSO ON FRIDAY...ACCUMULATING SNOW ABOVE 9000 FEET ACROSS PORTIONS
OF THE ABSAROKA AND BIGHORN MOUNTAINS...MAINLY BETWEEN 3 AM AND
NOON FRIDAY.

MONDAY AND TUESDAY...ELEVATED FIRE WEATHER CONDITIONS...MAINLY
OVER THE SOUTH.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT ANY HAIL SIZES AND WIND GUSTS OF
45 MPH OR GREATER. THANK YOU.

TEAM RIVERTON

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1203 PM MDT THU AUG 18 2016

WYZ002>007-014>018-182200-
ABSAROKA MOUNTAINS-CODY FOOTHILLS-NORTH BIG HORN BASIN-
SOUTHWEST BIG HORN BASIN-SOUTHEAST BIG HORN BASIN-
OWL CREEK AND BRIDGER MOUNTAINS-WIND RIVER MOUNTAINS WEST-
WIND RIVER MOUNTAINS EAST-UPPER WIND RIVER BASIN-WIND RIVER BASIN-
LANDER FOOTHILLS-
INCLUDING THE CITIES OF...CODY...MEETEETSE...THERMOPOLIS...
WORLAND...DUBOIS...RIVERTON...SHOSHONI...LANDER
1203 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. WIND GUSTS 30 TO 40 MPH
WILL BE POSSIBLE AT TIMES. BE ALERT...AS THESE STRONG WIND GUSTS
CAN OCCUR QUITE A FEW MILES AWAY FROM THE PARENT SHOWER OR
THUNDERSTORM. SMALL HAIL AND BRIEF HEAVY RAIN WILL ALSO BE
POSSIBLE WITH STRONGER SHOWERS AND STORMS.

WYZ008>011-019-020-022-182200-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-
INCLUDING THE CITIES OF...BUFFALO...KAYCEE...JEFFREY CITY...
CASPER
1203 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. WIND GUSTS 35 TO 45 MPH
WILL BE POSSIBLE AT TIMES. BE ALERT...AS THESE STRONG WIND GUSTS
CAN OCCUR QUITE A FEW MILES AWAY FROM THE PARENT SHOWER OR
THUNDERSTORM. SMALL HAIL AND BRIEF HEAVY RAIN WILL ALSO BE
POSSIBLE WITH STRONGER SHOWERS AND STORMS.

WYZ023>026-182200-
STAR VALLEY-SALT RIVER AND WYOMING RANGES-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER GREEN RIVER BASIN-
INCLUDING THE CITIES OF...AFTON...ALPINE...STAR VALLEY RANCH...
THAYNE...PINEDALE...LA BARGE...BIG PINEY...FARSON
1203 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. WIND GUSTS 35 TO 45 MPH
WILL BE POSSIBLE AT TIMES. BE ALERT...AS THESE STRONG WIND GUSTS
CAN OCCUR QUITE A FEW MILES AWAY FROM THE PARENT SHOWER OR
THUNDERSTORM. SMALL HAIL AND BRIEF HEAVY RAIN WILL ALSO BE
POSSIBLE WITH STRONGER SHOWERS AND STORMS.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1256 PM MDT THU AUG 18 2016

WYZ009-011-017-019-020-181945-
BIGHORN MOUNTAINS SOUTHEAST-WIND RIVER BASIN-SOUTHEAST JOHNSON
COUNTY-NATRONA COUNTY LOWER ELEVATIONS-GREEN MOUNTAINS AND
RATTLESNAKE RANGE-
1256 PM MDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL FREMONT...
NORTHWESTERN NATRONA AND SOUTHEASTERN JOHNSON COUNTIES UNTIL 145 PM
MDT...

AT 1255 PM MDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS
ALONG A LINE EXTENDING FROM NEAR MAYOWORTH TO 14 MILES NORTHEAST OF
HILAND TO 8 MILES NORTHEAST OF SAND DRAW. MOVEMENT WAS EAST AT 15
MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

STRONG THUNDERSTORMS WILL BE NEAR...
  MAYOWORTH AROUND 105 PM MDT.
  KAYCEE AROUND 135 PM MDT.

THIS INCLUDES INTERSTATE 25 BETWEEN MILE MARKERS 236 AND 266.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4320 10664 4257 10751 4278 10816 4326 10735
      4324 10730 4387 10685 4391 10619
TIME...MOT...LOC 1855Z 277DEG 14KT 4380 10684 4330 10721 4283 10803

BRAUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
136 PM MDT THU AUG 18 2016

WYZ001-002-005>007-012>018-182200-
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-
SOUTHWEST BIG HORN BASIN-SOUTHEAST BIG HORN BASIN-
OWL CREEK AND BRIDGER MOUNTAINS-TETON AND GROS VENTRE MOUNTAINS-
JACKSON HOLE-WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
INCLUDING THE CITIES OF...LAKE...MAMMOTH...OLD FAITHFUL...
THERMOPOLIS...WORLAND...JACKSON...DUBOIS...RIVERTON...SHOSHONI...
LANDER
136 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. SMALL HAIL AND
PERIODS OF LOCALIZED HEAVY RAIN WILL ALSO BE POSSIBLE WITH
STRONGER SHOWERS AND STORMS ALONG WITH WIND GUSTS 30 TO 40 MPH.
THESE STRONG WIND GUSTS CAN OCCUR QUITE A FEW MILES AWAY FROM THE
PARENT SHOWER OR THUNDERSTORM AND THE HEAVY RAIN COULD CAUSE
LOCALIZED FLASH FLOODING.

WYZ008>011-019-020-022-182200-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-
INCLUDING THE CITIES OF...BUFFALO...KAYCEE...JEFFREY CITY...
CASPER
136 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. SMALL HAIL AND
PERIODS OF LOCALIZED HEAVY RAIN WILL ALSO BE POSSIBLE WITH
STRONGER SHOWERS AND STORMS ALONG WITH WIND GUSTS 30 TO 40 MPH.
THESE STRONG WIND GUSTS CAN OCCUR QUITE A FEW MILES AWAY FROM THE
PARENT SHOWER OR THUNDERSTORM AND THE HEAVY RAIN COULD CAUSE
LOCALIZED FLASH FLOODING.

WYZ023>026-182200-
STAR VALLEY-SALT RIVER AND WYOMING RANGES-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER GREEN RIVER BASIN-
INCLUDING THE CITIES OF...AFTON...ALPINE...STAR VALLEY RANCH...
THAYNE...PINEDALE...LA BARGE...BIG PINEY...FARSON
136 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. SMALL HAIL AND
PERIODS OF LOCALIZED HEAVY RAIN WILL ALSO BE POSSIBLE WITH
STRONGER SHOWERS AND STORMS ALONG WITH WIND GUSTS 30 TO 40 MPH.
THESE STRONG WIND GUSTS CAN OCCUR QUITE A FEW MILES AWAY FROM THE
PARENT SHOWER OR THUNDERSTORM AND THE HEAVY RAIN COULD CAUSE
LOCALIZED FLASH FLOODING.

WYZ027>030-182200-
SOUTH LINCOLN COUNTY-ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-
EAST SWEETWATER COUNTY-
INCLUDING THE CITIES OF...KEMMERER...COKEVILLE...ROCK SPRINGS...
GREEN RIVER...WAMSUTTER
136 PM MDT THU AUG 18 2016

...ISOLATED TO WIDELY SCATTERED GUSTY SHOWERS OR THUNDERSTORMS
THIS AFTERNOON AND EARLY EVENING...

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON MOVING EAST
TO NORTHEAST ACROSS THE AREA AT 15 TO 20 MPH. SMALL HAIL AND
PERIODS OF LOCALIZED HEAVY RAIN WILL ALSO BE POSSIBLE WITH
STRONGER SHOWERS AND STORMS ALONG WITH WIND GUSTS 35 TO 45 MPH.
THESE STRONG WIND GUSTS CAN OCCUR QUITE A FEW MILES AWAY FROM THE
PARENT SHOWER OR THUNDERSTORM AND THE HEAVY RAIN COULD CAUSE
LOCALIZED FLASH FLOODING.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
149 PM MDT THU AUG 18 2016

WYZ017-019-182015-
WIND RIVER BASIN-GREEN MOUNTAINS AND RATTLESNAKE RANGE-
149 PM MDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN FREMONT COUNTY UNTIL
215 PM MDT...

AT 149 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11
MILES EAST OF SAND DRAW...OR 20 MILES NORTH OF JEFFREY CITY...MOVING
EAST AT 15 MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTHEASTERN
FREMONT COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4269 10807 4287 10802 4284 10759 4257 10767
TIME...MOT...LOC 1949Z 283DEG 11KT 4277 10795

BRAUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
154 PM MDT THU AUG 18 2016

WYZ018-019-182030-
LANDER FOOTHILLS-GREEN MOUNTAINS AND RATTLESNAKE RANGE-
154 PM MDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL FREMONT COUNTY
UNTIL 230 PM MDT...

AT 154 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8
MILES EAST OF RED CANYON...OR 17 MILES SOUTHEAST OF LANDER...MOVING
SOUTHEAST AT 20 MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTH CENTRAL
FREMONT COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4253 10855 4254 10853 4255 10852 4258 10859
      4261 10860 4262 10862 4265 10864 4276 10845
      4254 10809 4234 10842
TIME...MOT...LOC 1954Z 320DEG 18KT 4265 10849

BRAUN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
202 PM MDT THU AUG 18 2016

WYZ002-016-182045-
ABSAROKA MOUNTAINS-UPPER WIND RIVER BASIN-
202 PM MDT THU AUG 18 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL FREMONT AND WEST
CENTRAL HOT SPRINGS COUNTIES UNTIL 245 PM MDT...

AT 201 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11
MILES SOUTH OF WASHAKIE NEEDLES...OR 24 MILES EAST OF DUBOIS...MOVING
NORTH AT 20 MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  WASHAKIE NEEDLES AROUND 240 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4356 10901 4357 10904 4356 10904 4355 10902
      4351 10902 4350 10927 4388 10934 4388 10897
TIME...MOT...LOC 2001Z 178DEG 16KT 4358 10915

BRAUN