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Hazardous Weather Outlook

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
332 AM MDT SAT SEP 5 2015

WYZ001>020-022>030-060945-
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-
332 AM MDT SAT SEP 5 2015

...RED FLAG WARNING FOR PORTIONS OF CENTRAL WYOMING THIS AFTERNOON
THROUGH SUNDAY EVENING...


THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS WESTERN AND CENTRAL
WYOMING.

.DAY ONE...TODAY AND TONIGHT

AHEAD OF AN APPROACHING COLD FRONT...AREAS OF CENTRAL WYOMING WILL
SEE HUMIDITY DROP INTO THE LOW TO MID TEENS AND GUSTY WINDS WILL
DEVELOP. THESE ELEMENTS COMBINED WITH CRITICALLY DRY FUELS WILL
RESULT IN EXTREME FIRE BEHAVIOR THROUGH THE EVENING HOURS.

ELSEWHERE...A COLD FRONT WILL MOVE INTO THE AREA LATE THIS
MORNING...AND MOVE THROUGH THE AREA TONIGHT. THIS FRONT WILL BRING
MUCH COOLER TEMPERATURES ACROSS THE AREA...WITH SOME SNOW EXPECTED
OVER THE CENTRAL AND WESTERN MOUNTAINS OVERNIGHT. THOSE WITH
OUTDOOR INTERESTS SHOULD BE PREPARED FOR CHANGING CONDITIONS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SUNDAY...A RETURN OF LOW HUMIDITY AND GUSTY WIND WILL BRING
ANOTHER ROUND OF EXTREME FIRE BEHAVIOR FOR FREMONT AND NATRONA
COUNTIES. THE RED FLAG WILL CONTINUE THROUGH SUNDAY EVENING.

MONDAY...ELEVATED FIRE WEATHER CONDITIONS FOR FREMONT AND NATRONA
COUNTIES.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT WIND GUSTS OVER 40 MPH...AND ANY
SNOW ACCUMULATIONS. THANK YOU.

$$

TEAM RIVERTON




Special Weather Statement

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
405 AM MDT SAT SEP 5 2015

WYZ003>007-010-011-016>020-022-052100-
CODY FOOTHILLS-NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN-
SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-
INCLUDING THE CITIES OF...CODY...POWELL...LOVELL...GREYBULL...
THERMOPOLIS...WORLAND...BUFFALO...KAYCEE...DUBOIS...RIVERTON...
LANDER...JEFFREY CITY...BAIROIL...CASPER
405 AM MDT SAT SEP 5 2015

...SHARP COLD FRONT TO BRING COOLER TEMPERATURES AND ACTIVE
WEATHER TO START THE LABOR DAY WEEKEND...

AN AREA OF LOW PRESSURE...AND ITS ASSOCIATED COLD FRONT...WILL
PUSH ACROSS THE COWBOY STATE THIS HOLIDAY WEEKEND. ISOLATED TO
SCATTERED AFTERNOON SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE
AHEAD OF THIS FRONT TODAY ACROSS CENTRAL WYOMING. A FEW STORMS
COULD PRODUCE FREQUENT LIGHTNING AND GUSTY WINDS AT TIMES. IN
ADDITION...DRY AND BREEZY WINDS AHEAD OF THE APPROACHING FRONT
COULD BRING ELEVATED TO EXTREME FIRE DANGER ACROSS CENTRAL WYOMING
THIS AFTERNOON. SEE THE RED FLAG WARNING FOR MORE DETAILS. THE
MENTIONED COLD FRONT WILL PUSH ACROSS CENTRAL WYOMING THIS EVENING
THROUGH THE OVERNIGHT HOURS. THIS WILL BRING MAINLY ISOLATED TO
SCATTERED RAIN SHOWERS ACROSS CENTRAL WYOMING THROUGH THE
OVERNIGHT HOURS....WITH MOUNTAIN SNOW ABOVE 8500 FEET EXPECTED
ACROSS WESTERN WYOMING. ANY LINGERING SHOWERS AND MOUNTAIN SNOW IS
THEN EXPECTED TO DIMINISH QUICKLY EARLY SUNDAY MORNING.

DRY...BUT WINDY CONDITIONS ARE THEN EXPECTED FOR THE REST OF
SUNDAY INTO LABOR DAY. MUCH COOLER TEMPERATURES ARE EXPECTED FOR
SUNDAY...WITH HIGHS IN THE 60S AND 70S. MORNING LOWS ON MONDAY
WILL BE IN THE 40S...WITH SLIGHTLY WARMER DAYTIME HIGHS IN THE 60S
AND 70S FOR CENTRAL WYOMING.

$$



Red Flag Warning

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
255 AM MDT SAT SEP 5 2015

...ELEVATED TO EXTREME FIRE DANGER THIS AFTERNOON THROUGH
SUNDAY...

.DRY SOUTHWEST WINDS WILL STRENGTHEN THIS AFTERNOON AHEAD OF AN
APPROACHING COLD FRONT. ISOLATED TO WIDELY SCATTERED THUNDERSTORMS
WILL DEVELOP AHEAD OF THE COLD FRONT AND SPREAD INTO CENTRAL
WYOMING LATE THIS AFTERNOON THROUGH TONIGHT. THE STRONG COLD
FRONT WILL PUSH ACROSS THE AREA THIS EVENING WITH A SHARP WIND
SHIFT FROM THE WEST TO NORTHWEST. A VERY DRY AND GUSTY WEST
NORTHWEST FLOW WILL FOLLOW THE COLD FRONT ON SUNDAY.

WYZ280-283-289-060700-
/O.CON.KRIW.FW.W.0018.150905T1900Z-150907T0300Z/
NATRONA COUNTY/CASPER BLM-UPPER WIND RIVER BASIN/WIND RIVER BASIN-
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
255 AM MDT SAT SEP 5 2015

...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
9 PM MDT SUNDAY FOR STRONG WIND...LOW HUMIDITY AND CRITICAL
LIGHTNING FOR FIRE WEATHER ZONES 280... 283 AND 289...

* AFFECTED AREA...FIRE WEATHER ZONE 280. FIRE WEATHER ZONE 283.
  FIRE WEATHER ZONE 289.

* WIND...SOUTHWEST WIND 15 TO 25 MPH WITH GUSTS 35 TO 40 MPH THIS
  AFTERNOON. A COLD FRONT WILL SHIFT WINDS WEST TO NORTHWEST 15 TO
  25 MPH WITH GUSTS 30 TO 35 MPH TONIGHT... CONTINUING THROUGH
  EARLY SUNDAY EVENING.

* MINIMUM RELATIVE HUMIDITY...12 TO 15 PERCENT THIS AFTERNOON.
  NEAR 10 PERCENT SUNDAY AFTERNOON.

* LIGHTNING...ISOLATED TO WIDELY SCATTERED THUNDERSTORMS POSSIBLE
  LATE THIS AFTERNOON AND TONIGHT.

* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.
  OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL
CREATE EXTREME FIRE BEHAVIOR.

&&

$$





National Weather Service
Central Region Headquarters
Kansas City, Missouri
Last Modified: March 29, 2004
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