Mountain wave activity occurred on and off on December 7th. Strong wind gusts caused a tree to fall on a house, in which first responders had to assist.
Every event with a place to put it; 2 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.
Mountain wave activity occurred on and off on December 7th. Strong wind gusts caused a tree to fall on a house, in which first responders had to assist. A tree fell in the Deschutes river woods area south of Bend knocking out power to 400 households.
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 7, 9:59 AM PST, 31 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
959 AM PST MON DEC 7 2015
UPDATED AVIATION DISCUSSION
.UPDATE...THE LATEST RADAR WAS CONTINUING TO SHOW A LARGE AREA OF
PCPN ACROSS THE REGION AND THE RAIN WILL CONTINUE FOR THE REMAINDER
OF THE DAY. BREEZY TO WINDY CONDITIONS WILL PERSIST OVER PORTIONS
OF THE REGION AND NUMEROUS WIND ADVISORIES ARE IN EFFECT ALONG WITH A
HIGH WIND WARNING OVER CENTRAL OREGON INTO THIS EVENING.
TEMPERATURES ALONG WITH PCPN CHANCES AND WEATHER WERE ALL ADJUSTED
AND THE PRESENT SHORT TERM FORECAST APPEARS ON TRACK FOR NOW.
&&
.AVIATION...18Z TAFS...RAIN WITH VFR/MVFR AND LOCALIZED IFR
CONDITIONS WILL BE WIDESPREAD THROUGH THE DAY BEFORE TAPERING OFF
22Z-01Z. AFTER A BREAK WITH VFR CONDITIONS FROM 01Z-07Z, THE NEXT
SYSTEM WILL BEGIN MOVING INTO THE AREA WITH MORE RAIN AND VFR/MVFR
CONDITIONS TAPERING OFF TO SHOWERS AFTER 14Z. WINDS WILL INCREASE TO
15 TO 25 KTS WITH GUSTS TO 35 KTS LATER THIS MORNING. IT WILL BEGIN
DECREASING AFTER 03Z AND DROP BELOW 15 KTS BY 09Z. WINDS WILL BEGIN
TO INCREASE AGAIN AFTER 16Z TOMORROW MORNING. EXCEPTIONS TO THIS
WILL BE KYKM AND KDLS WHICH WILL ONLY INCREASE TO 10 TO 20 KTS WITH
GUSTS TO 25 KTS THIS AFTERNOON. PERRY
&&
.PREV DISCUSSION... /ISSUED 330 AM PST MON DEC 7 2015/
SHORT TERM...TODAY THROUGH WEDNESDAY...VERY ACTIVE WEATHER PATTERN
NEXT FEW DAYS. A STRONG AND WET WEATHER SYSTEM IS CURRENTLY MOVING
THROUGH THE CWA THIS MORNING WITH MODERATE TO HEAVY RAIN IN SOME
AREAS. KPDT ALREADY RECEIVED .47 INCHES IN THE LAST FEW HOURS AND
MUCH MORE THAN THAT HAS FALLEN IN THE MOUNTAINS...BOTH THE CASCADES
AND THE NORTHEAST MOUNTAINS. SNOW LEVELS ARE FAIRLY HIGH AND THE
PRECIPITATION IS MOSTLY ALL RAIN EXCEPT FOR THE HIGHEST PEAKS OF THE
CWA SUCH AS THE EAGLE CAP WILDERNESS AND THE HIGHER PEAKS OF THE
CASCADE CREST. PRECIPITATION IS FAIRLY SOLID IN COVERAGE AT THIS
TIME BUT WILL SEE IT BEGIN TO BREAK UP WITH A BREAK IN THE RAINFALL
THIS EVENING BEFORE PICKING UP AGAIN ON TUESDAY AS THE NEXT WAVE IN
THE PROGRESSIVE WESTERLY FLOW MOVES THROUGH THE CWA BY LATE TUESDAY
INTO WEDNESDAY. TIMING OF INDIVIDUAL SYSTEMS WILL BE DIFFICULT IN
THE ALMOST WESTERLY FLOW THROUGH THE SHORT TERM PERIOD. HOWEVER THE
FLOW DOES BECOME MORE AMPLIFIED TOWARD LATE TUESDAY AND WEDNESDAY
WITH A BREAK IN BETWEEN SYSTEMS SEEN TO HAPPEN ON TUESDAY BEFORE THE
NEXT STRONG AND WET WEATHER SYSTEM MOVES IN ON WEDNESDAY. MAIN
CONCERN WILL NOT ONLY BE THE RAINFALL THE NEXT FEW DAYS BUT
ESPECIALLY THE STRONG WINDS EXPECTED TODAY AND AGAIN ON WEDNESDAY. A
NUMBER OF HIGH WIND WARNINGS AND WIND ADVISORIES ARE IN EFFECT FOR
THE BULK OF THE CWA FOR TODAY THROUGH THIS EVENING IN SOME AREAS.
WILL WAIT UNTIL THE CURRENT EPISODE IS OVER BEFORE ISSUING ANY WIND
HIGHLIGHTS FOR WEDNESDAYS SYSTEM. TEMPERATURES WILL REMAIN QUITE
MILD AND WELL ABOVE AVERAGE FOR THE NEXT THREE DAYS...THOUGH IT WILL
START TO COOL OFF ON WEDNESDAY. 88
LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...A SERIES OF PACIFIC
FRONTAL SYSTEMS WILL BRING PERIODS OF RAIN AND MOUNTAIN SNOW THROUGH
THE EXTENDED PERIOD. BREEZY TO WINDY CONDITIONS CAN ALSO BE EXPECTED
AS SURFACE GRADIENTS WILL BE TIGHT AND STRONG WINDS ALOFT WILL MIX
TO THE SURFACE AS EACH SYSTEM MOVES THROUGH THE AREA.
THERE WILL BE A BRIEF BREAK WEDNESDAY EVENING IN EASTERN WASHINGTON
BEFORE A WARM FRONT MOVES FROM CENTRAL OREGON NORTHEAST ACROSS THE
REST OF THE CWA THURSDAY WITH WIDESPREAD RAIN AND WINDY CONDITIONS.
THURSDAY NIGHT A STRONG VERTICALLY STACKED LOW NEAR VANCOUVER ISLAND
WILL MOVE INTO WESTERN WASHINGTON AND OPEN INTO A WAVE FRIDAY AS IT
PASSES OVER EASTERN WASHINGTON AND OREGON. THIS WILL BRING SOME
SHOWERS AND WINDS. SNOW LEVELS WILL DROP TO 2500-3000 FEET FRIDAY AS
THE WAVE MOVES THROUGH. FRIDAY THROUGH SUNDAY THE MODELS START TO
SHOW SIGNIFICANT DIFFERENCES IN TIMING...BUT A PROGRESSIVE PATTERN
WITH A FRONT EVERY 18-24 HOURS WILL PERSIST. ANOTHER FRONT WILL MOVE
THROUGH SATURDAY (MORNING GFS OR EVENING ECMWF) FOLLOWED BY ANOTHER
ONE SUNDAY. COONFIELD
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT 57 49 66 47 / 100 30 50 40
ALW 56 50 66 49 / 100 30 60 40
PSC 56 49 63 47 / 90 30 50 40
YKM 50 42 61 42 / 90 30 50 60
HRI 57 49 63 47 / 90 30 40 40
ELN 46 39 54 38 / 100 30 60 60
RDM 54 46 61 44 / 60 30 30 40
LGD 49 44 51 43 / 100 50 60 40
GCD 48 40 55 41 / 80 30 30 20
DLS 51 48 60 47 / 100 40 50 60
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...HIGH WIND WARNING UNTIL 10 PM PST THIS EVENING FOR ORZ509>511.
WIND ADVISORY UNTIL 10 PM PST THIS EVENING FOR ORZ044-049-050-
507-508.
WA...WIND ADVISORY UNTIL 10 PM PST THIS EVENING FOR WAZ027>029-521.
&&
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
97/The national radar mosaic for the moment the first event began.
2 high wind. Local standard time, as filed.
Report came in from KTVZ website.
Report came from KTVZ website.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2015Every state in 2015This day in weather historyWarnings in Oregon, December 2015
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: 604252, 604253.