Potent upper level trough provided enough instability for a few strong thunderstorms across the Foothills of the Blue Mountains.
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.
Potent upper level trough provided enough instability for a few strong thunderstorms across the Foothills of the Blue Mountains.
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 Jun 9, 9:52 AM PST, 28 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE PENDLETON OR 1052 AM PDT WED JUN 9 2010 UPDATED FOR AVIATION DISCUSSION .UPDATE...POTENT UPPER LEVEL TROUGH WILL MOVE ACROSS THE AREA LATER THIS AFTERNOON. A TEMPORARY LULL IN THE SHOWER ACTIVITY WILL BE SHORT LIVED. AS AIRMASS DESTABILIZES THIS MORNING EXPECT SHOWER AND THUNDERSTORM ACTIVITY TO REDEVELOP. COULD BE A STRONG THUNDERSTORM OR TWO FROM THE FOOTHILLS EASTWARD FROM LATE MORNING THROUGH EARLY THIS EVENING. MAIN LIMITING FACTOR FOR A SIGNIFICANT SEVERE WEATHER OUTBREAK WILL BE MARGINAL INSTABILITY. CHANGES TO THE CURRENT FORECAST INCLUDE INCREASING POPS FOR TODAY AREAWIDE BASED ON 12 UTC MODEL GUIDANCE...AND TO DROP THE MENTION OF HEAVY RAIN SINCE PRECIPITABLE WATER VALUES ARE FORECAST TO DIMINISH DURING THE DAY AND STORMS ARE EXPECTED TO MOVE FAIRLY RAPIDLY. OTHERWISE...REMAINDER OF CURRENT FORECAST IS ON TRACK. 78 && AVIATION...18Z TAFS...MORNING SHOWERS ARE DISSIPATING AND HIGH DEWPOINTS ARE ALLOWING FOR LATE MORNING/EARLY AFTERNOON CONVECTIVE SHOWERS TO DEVELOP ACROSS THE AREA. CONDITIONS SHOULD STILL REMAIN VFR HOWEVER ISOLATED SHOWERS MAY BRIEFLY REDUCE CIGS AND VISIBILITIES. EXPECT THESE SHOWERS TO CONTINUE THROUGH 03-06Z WINDS ARE EXPECTED TO INCREASE 10-20KTS ACROSS ALL TAF SITES THIS AFTERNOON THROUGH THE OVERNIGHT HOURS...WITH GUSTS 25-30KTS. WEBER && .PREV DISCUSSION... /ISSUED 440 AM PDT WED JUN 9 2010/ SHORT TERM...TODAY THROUGH THURSDAY NIGHT...A FRONTAL SYSTEM WILL PUSH THROUGH THE EASTERN PORTION OF THE FORECAST AREA EARLY THIS MORNING PRODUCING SOME STEADY RAINFALL. FRONT WILL EXIT THE FORECAST AREA BY MID MORNING. BEHIND THE FRONT THE UPPER LEVEL TROUGH WILL SETTLE OVER THE REGION FOR THE NEXT COUPLE OF DAYS PROVIDING PRECIPITATION IN THE FORM OF SHOWERS. THERE WILL BE ENOUGH ATMOSPHERIC INSTABILITY THAT A FEW THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND EVENING MAINLY ACROSS THE EASTERN HALF OF THE FORECAST AREA (ROUGHLY AREAS EAST OF HIGHWAY 395). SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING BRIEF HEAVY RAIN AND SMALL HAIL. SHOWERS WILL DECREASE OVERNIGHT THEN INCREASE AGAIN ON THURSDAY AFTERNOON AND EVENING BEFORE DECREASING AGAIN THURSDAY NIGHT. THE POSSIBILITY FOR THUNDERSTORMS CONTINUES THURSDAY AFTERNOON IN NORTHEAST OREGON AND SOUTHEAST WASHINGTON MAINLY EAST OF MEACHAM. LONG TERM...FRIDAY THROUGH TUESDAY...AN UPPER LEVEL DISTURBANCE WILL MOVE SOUTH OF THE AREA FRIDAY. NORTHWEST FLOW BEHIND THE SYSTEM WILL KEEP THE LOWER ELEVATIONS DRY...BUT OROGRAPHIC EFFECTS MAY TRIGGER A FEW SHOWERS IN THE MOUNTAINS OF NORTHEAST OREGON. TEMPERATURES WILL REMAIN MILD FRIDAY AS RIDGING BEGINS TO BUILD INTO THE AREA BEHIND THE DISTURBANCE. A STRONG UPPER LEVEL RIDGE WILL BUILD OVER THE PACIFIC NORTHWEST FRIDAY NIGHT THROUGH SUNDAY. THIS WILL BRING DRY AND VERY WARM DAYS FOR THE WEEKEND. THE RIDGE AXIS WILL DRIFT SOUTH SUNDAY NIGHT AND MONDAY...WITH A WEAK TROUGH MOVING THROUGH MONDAY NIGHT AND TUESDAY. AT THIS TIME THE TROUGH DOES NOT LOOK STRONG ENOUGH TO DEVELOP ENOUGH MOISTURE FOR PRECIPITATION... BUT IT WILL ALLOW COOLER WEATHER BY TUESDAY. COONFIELD && .PRELIMINARY POINT TEMPS/POPS... PDT 66 48 61 46 / 60 40 30 20 ALW 68 50 64 49 / 60 40 30 20 PSC 71 52 68 49 / 50 20 20 20 YKM 66 46 65 45 / 40 20 20 20 HRI 70 49 66 48 / 50 20 20 20 ELN 64 47 60 48 / 50 20 30 20 RDM 64 40 57 37 / 30 20 20 20 LGD 63 44 57 41 / 60 60 40 40 GCD 64 45 57 41 / 60 30 30 40 DLS 65 52 64 50 / 50 30 30 20 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...NONE. WA...NONE. && THREAT INDEX TODAY : YELLOW THURSDAY : GREEN FRIDAY : 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 78/78/78
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
635 AM PDT WED JUN 9 2010
EXPANDED THUNDERSTORM COVERAGE
ORZ041>044-049-050-501>506-WAZ024-026>030-501-502-101345-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
CENTRAL OREGON-LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-
WALLOWA COUNTY-FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-
NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES-JOHN DAY BASIN-
OCHOCO-JOHN DAY HIGHLANDS-
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 CENTRAL CASCADES OF WASHINGTON-
EAST SLOPES OF THE SOUTHERN CASCADES OF WASHINGTON-
635 AM PDT WED JUN 9 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.
.DAY ONE...TODAY AND TONIGHT
THUNDERSTORMS
EAST SLOPES OF THE CENTRAL CASCADES OF WASHINGTON, EAST SLOPES
OF THE SOUTHERN CASCADES OF WASHINGTON, 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, EASTERN
COLUMBIA RIVER GORGE OF OREGON, NORTH CENTRAL OREGON, LOWER
COLUMBIA BASIN OF OREGON, GRANDE RONDE VALLEY, WALLOWA COUNTY,
FOOTHILLS OF THE BLUE MOUNTAINS OF OREGON, NORTHERN BLUE
MOUNTAINS OF OREGON, SOUTHERN BLUE MOUNTAINS OF OREGON,
NORTHERN WHEELER AND SOUTHERN GILLIAM COUNTIES, JOHN DAY
BASIN, OCHOCO-JOHN DAY HIGHLANDS
UNSTABLE CONDITIONS WILL LEAD TO THUNDERSTORM DEVELOPMENT OVER THE
FORECAST AREA TODAY THROUGH THIS EVENING. THUNDERSTORMS MAY CONTAIN
SMALL HAIL AND BRIEF HEAVY RAIN.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
THUNDERSTORMS THURSDAY
NORTHWEST BLUE MOUNTAINS OF WASHINGTON, GRANDE RONDE VALLEY,
WALLOWA COUNTY, NORTHERN BLUE MOUNTAINS OF OREGON
SOME LINGERING SHOWERS AND POSSIBLE THUNDERSTORMS WILL EFFECT
NORTHEAST OREGON AND SOUTHEAST WASHINGTON ON THURSDAY. THIS WILL BE
FOLLOWED BY A PERIOD OF HIGH PRESSURE OVER THE REGION PROVIDING DRY
AND WARM WEATHER.
.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.SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PENDLETON OR 1117 AM PDT WED JUN 9 2010 ORZ501-503-091915- FOOTHILLS OF THE BLUE MOUNTAINS OR-SOUTHERN BLUE MOUNTAINS OF OREGON OR- 1117 AM PDT WED JUN 9 2010 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MORROW AND CENTRAL UMATILLA COUNTIES UNTIL 1215 PM PDT... AT 1108 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES EAST OF HEPPNER...MOVING EAST AT 35 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. DOPPLER RADAR INDICATES THIS IS A ROTATING THUNDERSTORM AND THERE IS POTENTIAL THAT A TORNADO MAY DEVELOP. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 4560 11892 4526 11875 4521 11935 4537 11949 TIME...MOT...LOC 1815Z 250DEG 29KT 4533 11928
The Pendleton radar (KPDT), 23 km away, was scanning. The volume nearest the first event began at 18:21 UTC.
1 hail. Local standard time, as filed.
Dime to penny size hail accumulated to near 2 inches and caused minor vegetation damage. Street flooding occurred due to the hail overwhelming culverts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2010Every state in 2010This day in weather historyWarnings in Oregon, June 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: 226346.