Southeast pressure gradients produced very strong winds across the foothills of the Washington Blue Mountains. Several reports of high wind in MPH and damage including: A power outage due to wind in the Dayton and Pomeroy left over 4000 residents without power for several hours, wind gust of (58) 4 ESE College Place, wind gust of (636) at Walla Walla Airport, and a windmill on a farm was damaged…
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PDT wrote it up.
Southeast pressure gradients produced very strong winds across the foothills of the Washington Blue Mountains.
Several reports of high wind in MPH and damage including: A power outage due to wind in the Dayton and Pomeroy left over 4000 residents without power for several hours, wind gust of (58) 4 ESE College Place, wind gust of (636) at Walla Walla Airport, and a windmill on a farm was damaged with blades bent and broken.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pendleton, OR wrote its last area forecast discussion before the first event at Dec 20, 3:25 AM PST, 0 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
325 AM PST THU DEC 20 2012
UPDATED AVIATION DISCUSSION
.SHORT TERM...TODAY THROUGH FRIDAY. A LARGE UPPER LEVEL TROUGH
REMAINS CENTERED OFFSHORE TODAY. A COLD FRONT ALONG THE COAST WILL
MOVE SLOWLY THROUGH THE REGION LATE TODAY INTO THE EVENING.
SOUTHEAST PRESSURE GRADIENTS ASSOCIATED WITH A SURFACE LOW ARE
PRODUCING STRONG WINDS ACROSS MUCH OF CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTHEAST WASHINGTON EARLY THIS MORNING. SOUTHWEST WINDS
ALOFT ARE ALSO STRONG. THIS COMBINATION WILL CONTINUE TO PRODUCE
GUSTY SOUTHERLY WINDS THROUGH THE MORNING AND INTO EARLY AFTERNOON.
MODELS APPEAR ON TRACK INDICATING WINDS INCREASING OVER THE NEXT
SEVERAL HOURS WITH A PEAK THIS MORNING AROUND 8-11AM. HIGH WIND
WARNINGS AND ADVISORIES ARE IN EFFECT FOR MANY LOCATIONS. THE WINDS
ALOFT AND PRESSURE GRADIENTS WEAKEN LATER THIS AFTERNOON AND EXPECT
WINDS TO DECREASE INTO THE EVENING. AS FOR PRECIPITATION EXPECT THE
MAJORITY TO OCCUR WITH THE FRONTAL PASSAGE. THIS WOULD PLACE MOST OF
THE PRECIP OVER THE CASCADES AND EAST SLOPES THIS MORNING THEN
SPREAD EAST IN THE AFTERNOON AND EVENING. EXPECTING LOWER ELEVATION
RAIN AND HIGHER ELEVATION SNOW WITH THE HIGHEST AMOUNTS OVER THE
CASCADES. THE COLD FRONT MOVES EAST OF THE FORECAST AREA OVERNIGHT
WITH DECREASING PRECIPITATION AND CLOUDS. WITH THE UPPER TROUGH
REMAINING OFFSHORE A SOUTHWEST FLOW ALOFT CONTINUES FRIDAY. ANOTHER
SURFACE LOW MOVES ACROSS THE PACIFIC NORTHWEST. THIS WILL BRING
ADDITIONAL PRECIPITATION AND WIND ESPECIALLY FRIDAY NIGHT. 94
.LONG TERM...SATURDAY THROUGH SUNDAY...AN UPPER LEVEL TROUGH WILL
REMAIN OFFSHORE DURING THIS TIME. THIS WILL KEEP A MOISTURE PLUME
OVER THE PACIFIC NORTHWEST. SATURDAY AFTERNOON/EVENING A COLD FRONT
WILL MOVE THROUGH EASTERN WASHINGTON AND OREGON KEEPING POPS HIGH.
SNOW LEVELS WILL RISE AHEAD OF THE FRONT TO 2000-3000 FEET SO
PRECIPTATION WILL BE RAIN IN THE COLUMBIA BASIN AND THE FOOTHILLS OF
THE BLUE MOUNTAINS WITH SNOW IN THE MOUNTAINS. PRECIPITATION WILL
LINGER THROUGH SUNDAY DUE TO INSTABILITY ASSOCIATED WITH THE TROUGH.
.LONG TERM...MONDAY THROUGH WEDNESDAY...SHOWERS WILL DIMINISH ON
MONDAY AS A TRANSITORY RIDGE MOVES THROUGH..YET A FEW UPSLOPE SNOW
SHOWERS MAY LINGER OVER THE MOUNTAINS. PARTIALLY CLEARING SKIES
OVERNIGHT WILL ALLOW RADIATIONAL COOLING TO LOWER TEMPERATURES INTO
THE TEENS ACROSS CENTRAL OREGON AND IN THE MOUNTAINS...WITH LOWS IN
THE 20S ELSEWHERE. ON TUESDAY NIGHT A WARM FRONT WILL MOVE INTO THE
REGION. THERE ARE TIMING DIFFERENCES BETWEEN THE 0Z RUNS OF THE GFS
AND ECMWF...BUT BLENDING THE TWO MODELS BRINGS AT LEAST A SLIGHT
CHANCE OF SNOW AND LOW ELEVATION RAIN INTO THE AREA BY TUESDAY
NIGHT. THE BEST PRECIPITATION CHANCES SHOULD THEN BE ON WEDNESDAY
AND WEDNESDAY NIGHT AS THE LOW PRESSURE TROUGH SWINGS INTO
CALIFORNIA AND SOUTHERLY FLOW OVER EASTERN OREGON AND WASHINGTON
PULLS MOISTURE NORTHWARD. THIS SCENARIO WILL ALSO BRING BREEZY
SOUTHERLY WINDS ON WEDNESDAY AND A SLIGHTLY WARMER AIR MASS THAT
WILL RAISE TEMPERATURES INTO THE MID 30S TO LOWER 40S DURING THE
DAY. COONFIELD
&&
.AVIATION...12Z TAFS...CEILINGS WILL DECREASE TODAY AS A COLD FRONT
MOVES THROUGH. THERE MAY BE PERIODS OF MVFR CONDITIONS IN RAIN AND
LOW CIGS...PARTICULARLY AT KYKM AND KDLS TODAY...MAINLY WHEN THE
COLD FRONT PASSES THROUGH. SEE ABOVE FOR DISCUSSION OF THE WINDS
ASSOCIATED WITH A SURFACE LOW AND COLD FRONT TODAY. 76
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT 47 32 43 29 / 30 20 20 20
ALW 48 33 42 32 / 40 20 20 30
PSC 49 32 41 29 / 30 20 20 30
YKM 37 25 32 19 / 60 20 30 40
HRI 49 30 41 29 / 30 20 20 30
ELN 38 22 32 14 / 80 30 40 50
RDM 42 26 40 23 / 70 60 40 40
LGD 39 31 40 29 / 50 50 40 40
GCD 40 26 39 27 / 40 60 40 60
DLS 42 31 39 29 / 70 30 40 50
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WIND ADVISORY UNTIL 4 PM PST THIS AFTERNOON ORZ050.
WIND ADVISORY UNTIL 4 PM PST THIS AFTERNOON ORZ042-044.
HIGH WIND WARNING UNTIL 4 PM PST THIS AFTERNOON ORZ503-508.
WINTER WEATHER ADVISORY UNTIL 4 PM PST THIS AFTERNOON ORZ509.
HIGH WIND WARNING UNTIL NOON PST TODAY ORZ049.
HIGH WIND WARNING UNTIL 4 PM PST THIS AFTERNOON ORZ507.
WA...WIND ADVISORY UNTIL 4 PM PST THIS AFTERNOON WAZ028.
WINTER STORM WARNING UNTIL 10 AM PST THIS MORNING WAZ520.
HIGH WIND WARNING UNTIL 4 PM PST THIS AFTERNOON WAZ029.
WINTER STORM WARNING UNTIL 4 AM PST EARLY THIS MORNING WAZ026.
&&
THREAT INDEX
TODAY : RED
FRIDAY : GREEN
SATURDAY : GREEN
GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES.
YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
94/76/76HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
620 PM PST WED DEC 19 2012
ORZ041-042-044-049-050-502-503-505>509-WAZ024-026>030-520-521-
201415-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-WALLOWA COUNTY-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
EAST SLOPES OF THE OREGON CASCADES-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE WASHINGTON CASCADES-SIMCOE HIGHLANDS-
620 PM PST WED DEC 19 2012
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TONIGHT
SNOW
EAST SLOPES OF THE WASHINGTON CASCADES, KITTITAS VALLEY, EAST
SLOPES OF THE OREGON CASCADES
STRONG WIND
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON, GRANDE RONDE
VALLEY, WALLOWA COUNTY, FOOTHILLS OF THE NORTHERN BLUE
MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF OREGON,
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON
A VIGOROUS PACIFIC STORM SYSTEM WILL IMPACT THE REGION THROUGH
TONIGHT. THIS SYSTEM WILL CAUSE SNOW AND LOW ELEVATION RAIN TO FALL
ACROSS MUCH OF THE AREA. SNOW LEVELS WILL BEGIN AT THE BASIN AND
VALLEY FLOORS THIS MORNING, BUT WILL SLOWLY RISE TO BETWEEN 2000 AND
2500 FEET BY EARLY THURSDAY MORNING. HEAVIEST SNOW FALLS ARE
EXPECTED OVER PORTIONS OF SOUTH CENTRAL WASHINGTON AND CENTRAL
OREGON. WINTER WEATHER WARNINGS AND ADVISORIES CONTINUE FOR THE
AREAS LISTED ABOVE. PLEASE REFER TO NWS PRODUCT PDXWSWPDT FOR
FURTHER DETAILS.
THIS SYSTEM WILL ALSO CAUSE STRONG WINDS ACROSS PORTIONS OF THE
AREA. WIND ADVISORIES AND HIGH WIND WARNINGS CONTINUE FOR THE ABOVE
LISTED ZONES. DETAILS CAN BE FOUND IN NWS PRODUCT PDXNPWPDT.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
SNOW THURSDAY
EAST SLOPES OF THE WASHINGTON CASCADES, EAST SLOPES OF THE
OREGON CASCADES
STRONG WIND THURSDAY
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON, GRANDE RONDE
VALLEY, WALLOWA COUNTY, FOOTHILLS OF THE NORTHERN BLUE
MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF OREGON,
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON
SNOW AND WIND IMPACTS ASSOCIATED WITH THE STORM MOVING INTO THE
REGION TODAY WILL CONTINUE INTO THURSDAY. THE WEATHER PATTERN LOOKS
TO REMAIN ACTIVE WITH UNSETTLED CONDITIONS EXPECTED TO PERSIST
THROUGH THE REMAINDER OF THIS PERIOD.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUIRED.
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:
WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML
ALL LETTERS IN THE ABOVE URL ARE LOWER CASE.The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2012Every state in 2012This day in weather historyWarnings in Washington, December 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 418721.