Severe Thunderstorm Warning 3, NWS Pendleton, OR

687 
WUUS56 KPDT 272309
SVRPDT
ORC059-WAC071-272330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PENDLETON OR
407 PM PDT FRI APR 27 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN UMATILLA COUNTY IN NORTHEAST OREGON
  SOUTHEASTERN WALLA WALLA COUNTY IN SOUTH CENTRAL WASHINGTON

* UNTIL 430 PM PDT

* AT 407 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES SOUTHEAST OF WALLA WALLA...OR
  ABOUT 10 MILES EAST OF MILTON-FREEWATER...MOVING NORTH AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WALLA WALLA AT 420 PM PDT

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
310 PM PDT FRI APR 27 2001

THUNDERSTORMS WILL CONTINUE TO DEVELOP THROUGH EASTERN OREGON AND
SOUTHEASTERN WASHINGTON THIS AFTERNOON AND TONIGHT...MAINLY OVER THE
MOUNTAIN AND FOOTHILLS. RADAR RETURNS ARE SUPPORTING THE POSSIBILITY
OF SOME CELLS BECOMING SEVERE AS THE AFTERNOON HEATING PROGRESSES.
CONVECTIVE PARAMETERS IN NORTHEAST OREGON AND SOUTHEAST WASHINGTON
ALL POINT TO SUCH SEVERE DEVELOPMENT. SOUTHWEST FLOW ALOFT WILL
CONTINUE TO MOVE THESE STORMS TO THE NORTHEAST TONIGHT. A COLD FRONT
WILL PASS THROUGH EASTERN OREGON TONIGHT...AHEAD OF A WELL DEVELOPED
TROUGH WHICH WILL MOVE ONSHORE TONIGHT AND THROUGH OUR AREA
SATURDAY. THE OFFSHORE TROUGH...WITH A COLD MOIST AIRMASS...WILL
BRING WIDESPREAD LIGHT RAIN. ALSO EXPECT BREEZY WINDS TO DEVELOP
WITH THE JET IN THE BASE AND LEADING EDGE OF THE TROUGH. UPPER LEVEL
WINDS WILL BECOME ZONAL SUNDAY FOLLOWING THE TROUGH PASSAGE...WITH
ANOTHER DISTURBANCE MOVING IN SUNDAY WITH MOSTLY CHANCE
POPS.  FARMER

.EXTENDED...ZONAL FLOW WILL SET UP OVER THE PACIFIC NORTHWEST DURING
THE FIRST HALF OF THE EXTENDED. THIS WILL PRODUCE A CHANCE OF PRECIP
EACH DAY. SOME RIDGING BUILDS IN THE EASTERN PACIFIC AND MOVES
INLAND LATE WEDNESDAY AND THURSDAY FOR SOME IMPROVEMENT. THIS WILL
BE SHORT LIVED AS ANOTHER TROUGH MOVES INTO THE PAC NW LATE THURSDAY
AND FRIDAY. SOLOMON

PDT 6633  ALW 6634  PSC 4613  YKM 4626

.KPDT...WSR-88D...VCP21/CSR21...OPERATIONAL.

.KPDT...NONE.

WAZ029-030-ORZ045>050-272200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  PENDLETON OR
1035 AM PDT FRI APR 27 2001

...THUNDERSTORMS ARE ANTICIPATED THIS AFTERNOON AND EVENING FROM
CENTRAL OREGON TO SOUTHEAST WASHINGTON...

A COLD FRONT WILL CROSS THE CASCADE MOUNTAINS THIS EVENING. AHEAD OF
THIS FRONT AMPLE MOISTURE AND HEATING WILL LEAD TO VERY UNSTABLE
CONDITIONS THIS AFTERNOON AND EVENING. SOME OF THESE STORMS MAY
BECOME SEVERE WITH A POSSIBILITY OF LARGE HAIL...GUSTY WINDS AND
HEAVY RAIN.

THE AREA OF POSSIBLE SEVERE WEATHER INCLUDES THE GRANDE RONDE AND
JOHN DAY VALLEYS...THE OCHOCO...BLUE AND WALLOWA MOUNTAINS...AS WELL
AS THE FOOTHILLS OF THE BLUE MOUNTAINS. WEATHER SPOTTERS AND
EMERGENCY MANAGEMENT OFFICIALS SHOULD BE ON THE LOOKOUT FOR SEVERE
WEATHER AND PASS ALONG ANY STORM REPORTS TO THE NATIONAL WEATHER
SERVICE.

DENMAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OREGON
1145 AM PDT FRI APR 27 2001

TIME(PDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0943 PM    20 S SPRAY                OR   SMALL STREAM FLOODING
04/26/01   WHEELER                        THE OREGON DOT REPORTED
                                          MUD AND DEBRIS WASHED
                                          ACyROSS US-26 BETWEEN
                                          MILEPOSTS 88 AND 94
                                          FROM A HEAVY
                                          THUNDERSTORM.