A severe thunderstorm brought damaging winds during the early morning to portions of Walla Walla.
Every event with a place to put it. 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.
A severe thunderstorm brought damaging winds during the early morning to portions of Walla Walla.
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 14, 4:50 AM PST, 4 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE PENDLETON OR 450 AM PST TUE DEC 14 2010 UPDATED AVIATION DISCUSSION .SHORT TERM...TODAY THROUGH WEDNESDAY NIGHT...A FAST MOVING COLD FRONT IS CURRENTLY MOVING ACROSS WESTERN OREGON AND IS BEGINNING TO MOVE INTO THE CASCADES. THE MAIN FRONTAL BOUNDARY HAS JUST PAST KPDX. THE FRONT IS BEING PUSHED BY A STRONG JET STREAM ALOFT WHICH IS PERPENDICULAR TO THE FRONT. THOUGH THE FORECAST AREA IS IN THE LEFT EXIT REGION OF THE STRONG 150 KT JET...WHICH WOULD SUPPORT HEAVY DYNAMIC LIFT CAUSED PRECIPITATION...THE FAST MOVEMENT OF THE COLD FRONT WILL PREVENT ANY PROLONGED HEAVY RAIN AND THEREFORE THERE IS CURRENTLY NO THREAT OF ANY FLOODING CAUSED BY HEAVY RAIN (COMBINED WITH SNOW MELT RUNOFF). TEMPERATURES ARE STILL QUITE MILD ACROSS EASTERN OREGON AND SOUTHEAST WASHINGTON FOR THE TIME OF YEAR WITH KPDT STILL AT 50 DEGREES F...AND MAINLY 40S ELSEWHERE. COOLER AIR WILL BEGIN TO FILTER INTO THE REGION BEHIND THE COLD FRONT WHICH IS EXPECTED TO MOVE ACROSS WESTERN PORTIONS OF THE FORECAST AREA BY AROUND 12Z-14Z KEEPING TEMPERATURES NEAR STEADY THERE TODAY...AND THEN THE EASTERN BORDER OF THE CWA BY 22Z-00Z THIS AFTERNOON. THE EASTERN AREAS WILL HAVE SOME INCREASE IN TEMPERATURE TODAY BEFORE THE COLD FRONT PASSES. COLDER AIR AND LOWERING SNOW LEVELS WILL OCCUR TONIGHT THROUGH WEDNESDAY NIGHT WHICH WILL CAUSE PRECIPITATION IN THE MOUNTAINS GENERALLY ABOUT 2500 FEET TO BECOME ALL SNOW WITH A MIXTURE OF RAIN AND SNOW SHOWERS BETWEEN 1500-2500 FEET AND RAIN BELOW 1500 FEET (I.E. RAIN IN THE BASIN AND ADJACENT BLUE MOUNTAIN FOOTHILLS AND VALLEYS). THE WEATHER PATTERN WILL THEN REMAIN UNSETTLED IN A PROGRESSIVE...MOSTLY ZONAL FLOW ALOFT INTO THE EXTENDED PERIOD. LASTLY...WILL CANCEL THE WIND ADVISORY IN THE GRANDE RONDE VALLEY WITH THE MORNING PACKAGE DUE TO LACK OF WINDS REACHING ADVISORY CRITERIA AND WEAKENING GRADIENTS BEHIND THE COLD FRONT. 88 .LONG TERM...THURSDAY THROUGH FRIDAY NIGHT...A MID/UPPER LEVEL RIDGE OF HIGH PRESSURE WILL KEEP MOST OF THE FORECAST AREA DRY THROUGH THURSDAY NIGHT...EXCEPT FOR SOME SNOW SHOWERS ALONG THE EAST SLOPES OF THE CASCADES. FRIDAY AND FRIDAY NIGHT A WARM FRONT TRANSPORTS MOISTURE AND OVERRUNNING LIFT INTO THE FORECAST AREA FOR AN INCREASING CHANCE OF VALLEY RAIN AND MOUNTAIN SNOW WITH SNOW LEVELS IN THE RANGE OF 2000-2500 FEET. POLAN SATURDAY THROUGH MONDAY...FOR THE REMAINDER OF THE LONG TERM PERIOD THERE WILL BE A CHANCE OF RAIN/SNOW EACH DAY. A LARGE UPPER LEVEL LOW WILL REMAIN OVER THE NORTHEAST PACIFIC. THIS WILL KEEP WASHINGTON AND OREGON IN A WEST TO SOUTHWEST FLOW ALOFT WHICH WILL KEEP AN ACTIVE WEATHER PATTERN OVER THE REGION. SHORT WAVES ROTATING AROUND THE UPPER LOW WILL MOVE ACROSS THE FORECAST AREA THURSDAY NIGHT THROUGH THE WEEKEND AND INTO EARLY NEXT WEEK. THESE SYSTEMS WILL BRING PERIODS OF RAIN AND SNOW. TEMPERATURE PROFILES INDICATE LITTLE CHANGE IN THE TEMPERATURES THROUGH THE PERIOD. HIGHS WILL CONTINUE IN THE 30S FOR MOST LOCATIONS. SURFACE LOW PRESSURE OFFSHORE WILL MAINTAIN AN EASTERLY GRADIENT TO THE WINDS. LOW LEVEL LAPSE RATES DO NOT INDICATE ANY WIDESPREAD FOG EVENTS THOUGH THERE WILL LIKELY BE PATCHY FOG DURING SOME OF THE NIGHTTIME PERIODS. 94 && .AVIATION...12Z TAFS...RAIN SHOWERS WILL INCREASE THIS MORNING AHEAD OF A COLD FRONT SCHEDULED TO MOVE ACROSS EASTERN SECTIONS OF OREGON AND WASHINGTON. AHEAD OF THE FRONT KPDT RADAR AT 430 AM SHOWED A SQUALL LINE OF HEAVY RAIN SHOWERS AND STRONG GUSTY WINDS TO 45 KNOTS MOVING RAPIDLY EAST ACROSS THE LOWER COLUMBIA BASIN. THE LINE OF SHOWERS WILL BRING KPDT AND KALW VERY WINDY CONDITIONS AND VERY HEAVY RAIN LASTING 15 TO 30 MINUTES UNTIL 14Z THIS MORNING. MVFR/IFR CONDITIONS DUE TO FOG WILL CONTINUE AT KYKM THIS MORNING WITH IMPROVING CONDITIONS FOLLOWING PASSAGE OF THE COLD FRONT BY 15Z. OTHERWISE...THE OTHER TAF SITES WILL HAVE VFR CONDITIONS PRIOR TO AND AFTER THE COLD FRONT PASSAGE THIS MORNING. INCREASING PRESSURE GRADIENTS ASSOCIATED WITH THE COLD FRONT WILL BRING WESTERLY WINDS OF 15-25 KTS WITH BRIEF GUSTS TO 40 KTS. POLAN && .PRELIMINARY POINT TEMPS/POPS... PDT 48 32 41 28 / 90 20 10 10 ALW 49 33 42 31 / 90 20 20 10 PSC 52 31 43 26 / 70 20 10 10 YKM 44 25 35 23 / 50 20 20 10 HRI 49 29 42 25 / 70 20 10 10 ELN 41 25 34 21 / 40 20 20 10 RDM 44 22 38 23 / 70 20 20 10 LGD 43 28 37 24 / 90 30 10 10 GCD 42 29 38 26 / 70 20 10 10 DLS 47 30 42 30 / 70 20 30 20 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...NONE. WA...NONE. && THREAT INDEX TODAY : YELLOW WEDNESDAY : YELLOW THURSDAY : 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 88/99/99
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
530 PM PST MON DEC 13 2010
UPDATED FOR TONIGHT WORDING
ORZ041-042-044-049-050-502-503-505>509-WAZ024-026>030-520-521-
141330-
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-
530 PM PST MON DEC 13 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TONIGHT
STRONG WIND TONIGHT
GRANDE RONDE
ANOTHER WEATHER SYSTEM WILL MOVE INTO THE REGION LATE TONIGHT
BRINGING ANOTHER ROUND OF RAIN TO THE FORECAST AREA. IN ADVANCE OF
THIS SYSTEM WINDS WILL INCREASE NEAR LADD AND PYLES CANYON AND UNION
IN THE SOUTHERN GRANDE RONDE VALLEY. A WIND ADVISORY HAS BEEN
ISSUED FOR THIS AREA FOR SOUTHERLY WINDS 30 TO 40 MPH WITH GUSTS TO
45 MPH.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
STRONG WIND TUESDAY
EAST SLOPES OF THE WASHINGTON CASCADES, SIMCOE HIGHLANDS,
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON, KITTITAS VALLEY,
YAKIMA VALLEY, LOWER COLUMBIA BASIN OF WASHINGTON, FOOTHILLS
OF THE BLUE MOUNTAINS OF WASHINGTON, EASTERN COLUMBIA RIVER
GORGE OF OREGON, NORTH CENTRAL OREGON, EAST SLOPES OF THE
OREGON CASCADES, LOWER COLUMBIA BASIN OF OREGON, FOOTHILLS OF
THE NORTHERN BLUE MOUNTAINS OF OREGON, FOOTHILLS OF THE
SOUTHERN BLUE MOUNTAINS OF OREGON
A STRONG COLD FRONT WILL MOVE INTO THE PACIFIC NORTHWEST USHERING IN
COLDER TEMPERATURES...STRONG WINDS AND A BRIEF PERIOD OF HEAVY RAIN
AND HIGH MOUNTAIN SNOW. SURFACE PRESSURE GRADIENTS WILL TIGHTEN UP
AHEAD OF THE FRONT AND WITH THE FRONT WHICH WILL CAUSE AN INCREASE
IN WINDS. IN ADDITION VERTICAL MIXING WITH THE COLD FRONT WILL HELP
TO CAUSE STRONGER WINDS ALOFT TO BE TRANSPORTED DOWNWARD TO THE
SURFACE.
UNSETTLED AND COOLER CONDITIONS WILL DOMINATE THE WEATHER FOR THE
REST OF THE WEEK INTO THE WEEKEND WITH FREQUENT WEATHER SYSTEMS
MOVING ACROSS THE PACIFIC NORTHWEST...WITH SOME BREAKS BETWEEN
SYSTEMS.
.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 Pendleton radar (KPDT), 58 km away, was scanning. The volume nearest the first event began at 12:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm with winds gusting to 58 mph knocked down trees and caused power outages to over 3500 customers in Walla Walla. One large tree fell onto an unoccupied car and caused major damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2010Every state in 2010This day in weather historyWarnings in Washington, December 2010
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: 269073.