weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

Flash Flood Watch


FLOOD WATCH
NATIONAL WEATHER SERVICE PENDLETON OR
255 PM PDT FRI MAY 22 2015

...SIGNIFICANT DOWNPOURS WITH THUNDERSTORMS TODAY...

.THUNDERSTORMS WILL CONTINUE DEVELOPING THIS AFTERNOON ACROSS
EASTERN OREGON...SOUTHEAST WASHINGTON...AND ALONG THE EAST SLOPES
OF THE WASHINGTON CASCADES THAT WILL PERSIST INTO THIS EVENING.
THESE STORMS WILL BE SLOW MOVING AND MAY CAUSE SIGNIFICANT
DOWNPOURS AT SOME LOCATIONS. FLASH FLOODING OR DEBRIS FLOWS ARE
POSSIBLE IN AREAS NEAR STEEP TERRAIN.

ORZ049-050-502-503-505-506-230400-
/O.CON.KPDT.FF.A.0001.000000T0000Z-150523T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GRANDE RONDE VALLEY-WALLOWA COUNTY-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-
INCLUDING THE CITIES OF...COVE...ELGIN...LA GRANDE...UNION...
ENTERPRISE...JOSEPH...WALLOWA...MEACHAM...TOLLGATE...LONG CREEK...
NORTH POWDER...UKIAH...DAYVILLE...JOHN DAY...MITCHELL...
MONUMENT...SPRAY...BROTHERS...PAULINA...PRAIRIE CITY...SENECA
255 PM PDT FRI MAY 22 2015

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM PDT THIS
EVENING...

THE FLASH FLOOD WATCH CONTINUES FOR

* PORTIONS OF CENTRAL OREGON AND NORTHEAST OREGON...INCLUDING
  THE FOLLOWING AREAS...IN CENTRAL OREGON...JOHN DAY BASIN AND
  OCHOCO-JOHN DAY HIGHLANDS. IN NORTHEAST OREGON...GRANDE RONDE
  VALLEY...NORTHERN BLUE MOUNTAINS OF OREGON...SOUTHERN BLUE
  MOUNTAINS OF OREGON AND WALLOWA COUNTY.

* UNTIL 9 PM PDT THIS EVENING

* SHOWERS AND THUNDERSTORMS ARE EXPECTED AGAIN TODAY. THESE
  THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HEAVY RAIN OVER AREAS
  THAT HAVE RECENTLY RECEIVED ABUNDANT RAINFALL. EXPECT RAINFALL
  RATES OF ONE HALF TO ONE INCH OF RAIN PER HOUR WITH SOME STORMS.
  THIS WILL THREATEN PORTIONS OF CENTRAL AND NORTHEAST OREGON WITH
  FLASH FLOODING OR DEBRIS FLOWS.

* EXPECT STANDING WATER ALONG ROADWAYS WHERE HEAVY RAIN FROM
  THUNDERSTORMS OCCURS...ESPECIALLY IN AREAS THAT HAVE POOR
  DRAINAGE. THE MAIN THREAT WILL BE DEBRIS FLOWS IN AREAS OF
  STEEP TERRAIN. SHARP RISES ALONG RIVER AND STREAMS ARE ALSO
  POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD
TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.

&&

$$


Special Weather Statement


SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
416 PM MDT FRI MAY 22 2015

WYZ001>008-012>019-023>026-230115-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS WEST-CODY FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NORTH BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
SALT RIVER AND WYOMING RANGES-SOUTHEAST BIG HORN BASIN-
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-
416 PM MDT FRI MAY 22 2015

THROUGH THIS EVENING...SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
WILL MOVE WEST TO NORTHWEST ACROSS THE REGION. THE MAIN HAZARDS FROM
THE STRONGER ACTIVITY...WILL BE BRIEF VERY HEAVY RAINFALL...SMALL
HAIL...AND CLOUD TO GROUND LIGHTNING. THE BRIEF HEAVY RAINFALL
COULD CAUSE PONDING OF WATER ON AREA ROADWAYS...AND MINOR FLOODING IN
LOW LYING OR POOR DRAINAGE AREAS. MOTORISTS ARE URGED TO SLOW DOWN TO
MINIMIZE THE RISK OF HYDROPLANING.

$$

21


Hazardous Weather Outlook


HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
400 AM MDT FRI MAY 22 2015

WYZ001>020-022>030-231200-
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 FRI MAY 22 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED THUNDERSTORMS AREA WIDE...A COUPLE STRONGER STORMS NEAR THE
WESTERN BORDER AREA.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SATURDAY AND SUNDAY...COOL AND WET CONDITIONS IN THE MOUNTAINS WITH A
COUPLE OF INCHES OF SNOW POSSIBLE ABOVE 9000 FEET EACH NIGHT.
ISOLATED THUNDERSTORMS POSSIBLE EACH DAY.

MONDAY THROUGH THURSDAY...ISOLATED THUNDERSTORMS EACH AFTERNOON AND
EVENING....LITTLE MORE NUMEROUS THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

$$

TEAM RIVERTON


Short Term Forecast


SHORT TERM FORECAST
NATIONAL WEATHER SERVICE SPOKANE WA
319 PM PDT FRI MAY 22 2015

IDZ003-026-WAZ033-230030-
IDAHO PALOUSE-LEWISTON AREA-WASHINGTON PALOUSE-
INCLUDING THE CITIES OF...MOSCOW...PLUMMER...POTLATCH...GENESEE...
LEWISTON...LAPWAI...PECK...CULDESAC...GIFFORD...PULLMAN...
COLFAX...ROSALIA...LA CROSSE...OAKESDALE...TEKOA...UNIONTOWN
319 PM PDT FRI MAY 22 2015

.NOW...
A BROKEN LINE OF THUNDERSTORMS STRETCHING FROM JUST SOUTH OF
MOSCOW TO POTLATCH...TENSED AND LATAH WILL MOVE SLOWLY SOUTHWEST
OFF THE HIGHER TERRAIN AND ONTO THE PALOUSE THROUGH 430 PM. THIS
INCLUDES PULLMAN...COLFAX...UNIONTOWN...STEPTOE AND PLAZA. THE
STRONGEST STORMS WILL PRODUCE DANGEROUS LIGHTNING...BRIEF HEAVY
DOWNPOURS...HAIL SLIGHTLY LARGER THAN PEA SIZE AND WIND GUSTS TO
35 MPH.

$$

SHORT TERM FORECAST
NATIONAL WEATHER SERVICE SPOKANE WA
319 PM PDT FRI MAY 22 2015

WAZ037-038-230030-
NORTHEAST MOUNTAINS-OKANOGAN HIGHLANDS-
INCLUDING THE CITIES OF...COLVILLE...DEER PARK...CHEWELAH...
NEWPORT...KETTLE FALLS...REPUBLIC...INCHELIUM...WAUCONDA
319 PM PDT FRI MAY 22 2015

.NOW...
A BROKEN LINE OF THUNDERSTORMS STRETCHING WEST TO EAST ACROSS PEND
OREILLE...STEVENS...AND FERRY COUNTY WILL MOVE SOUTHWEST AND MOVE
ACROSS TOWNS SUCH AS CEDONIA...FRUITLAND...SPRINGDALE...AND
KELLER THROUGH 430 PM. THIS ALSO INCLUDES THE DEVILS ELBOW BURN
SCAR COMPLEX OF 2014 BETWEEN REPUBLIC AND KELLER. BE AWARE THAT
IT MAY ONLY TAKE ABOUT ONE- QUARTER INCH OF RAIN TO BEGIN TO SEE
MINOR DEBRIS FLOWS ON THE BURN SCAR TERRAIN. THE STRONGEST STORMS
WILL PRODUCE DANGEROUS LIGHTNING...BRIEF HEAVY DOWNPOURS...PEAS
SIZE HAIL...AND WIND GUSTS AROUND 35 MPH.

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE