Under the influence of an unstable airmass and favorable south to southeasterly flow, thunderstorms broke out over eastern Oregon and over the Oregon Cascades, and advanced across the forecast area. A few of these storms became severe.
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 PQR wrote it up.
Under the influence of an unstable airmass and favorable south to southeasterly flow, thunderstorms broke out over eastern Oregon and over the Oregon Cascades, and advanced across the forecast area. A few of these storms became severe.
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 Portland, OR wrote its last area forecast discussion before the first event at Jun 29, 1:45 PM PST, 2 hours 26 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PORTLAND OR
245 PM PDT SUN JUN 29 2008
.SYNOPSIS...AN UPPER LEVEL LOW ALONG THE CALIFORNIA COAST WILL LIFT
NORTH ALONG THE COAST AND THROUGH SOUTHWEST WASHINGTON AND NORTHWEST
OREGON TONIGHT AND MONDAY. THIS WILL BRING A CHANCE OF SHOWERS OR
THUNDERSTORMS TO MUCH OF THE AREA TONIGHT AND EARLY MONDAY.
INCREASING ONSHORE FLOW WILL BEGIN LIMITING THE CONVECTION TO MAINLY
THE CASCADES LATER MONDAY AND TUESDAY. LOW CLOUDS ALONG THE COAST
WILL BEGIN SPREADING INTO THE INLAND VALLEYS IN THE LATE NIGHT AND
MORNING HOURS WITH GREATER REGULARITY THROUGH THE EARLY AND MIDDLE
PART OF THE WEEK WITH DECREASING TEMPERATURES. ANOTHER UPPER LEVEL
SYSTEM WILL APPROACH LATE THIS WEEK.
&&
.SHORT TERM...SOME DEBRIS CLOUDS FROM OVERNIGHT CONVECTION WERE
MOVING NORTH THROUGH WESTERN OREGON THIS AFTERNOON WITH SOME DEGREE
OF DEVELOPMENT. THIS AREA WILL LIKELY DEVELOP INTO SOME SHOWERS OR
THUNDERSTORMS AS IT MOVES NORTH TOWARD THE COLUMBIA RIVER AND THEN
THROUGH SOUTHWEST WASHINGTON. IN ADDITION...A LOW OFF CALIFORNIA
CONTINUES TO BE FORECAST TO LIFT NORTH ALONG THE COAST AND THROUGH
NORTHWEST OREGON AND SOUTHWEST WASHINGTON TONIGHT AND MONDAY THAT
SHOULD DEVELOP NEW CONVECTION SOUTH OF THIS AREA AND MAINTAIN IT
THROUGH THE NIGHT. THIS LOW LIFTING NORTH AS SOME JET SUPPORT WITH IT
AS WELL. PRETTY MUCH ANYWHERE FROM THE COAST RANGE CREST TO THE
CASCADE CREST WILL BE AT RISK OF A SHOWER OR THUNDERSTORM TONIGHT.
THERE COULD BE SOME RESIDUAL ACTIVITY ESPECIALLY NORTH EARLY MONDAY.
A SHALLOW MARINE AIR MASS CONTINUES ALONG THE COAST...WITH CLOUDS
CLOSE TO THE COASTLINE THIS AFTERNOON. THE SOUTHERLY FLOW ALOFT WILL
INHIBIT ANY ONSHORE PUSH TONIGHT...BUT DO EXPECT CLOUDS TO PRESS INTO
THE COASTAL GAPS BUT LIKELY ONLY LIMITED PENETRATION INTO THE
INTERIOR VALLEYS MONDAY MORNING.
THE ONSHORE FLOW INCREASES MONDAY WITH THE THERMAL TROUGH WELL INTO
EASTERN OREGON. SUSPECT THIS WILL CAUSE CONVECTION MONDAY TO BE MORE
CONFINED TO THE CASCADES. THE INCREASED ONSHORE FLOW WILL LIKELY
RESULT IN A BETTER PUSH OF MARINE CLOUDS INLAND LATE MONDAY NIGHT AND
TUESDAY...ESPECIALLY WITH A SLIGHT TENDENCY FOR THE UPPER FLOW TO BE
A BIT MORE SOUTHWESTERLY. EXPECT THESE TWO TRENDS TO CONTINUE
WEDNESDAY...WITH THE CONVECTION MORE CONFINED TOWARD THE HIGHER
ELEVATIONS OF THE CASCADES...AND A CONTINUED NIGHT AND MORNING PUSH
OF LOW CLOUDS INLAND FROM THE COAST.
THIS WILL BE THE LAST DAY FOR THE HEAT ADVISORY...AND MAY NEED TO
DROP FOR THE CENTRAL VALLEY ALREADY. TEMPS WILL BE DROPPING INTO THE
80S FOR THE FEW DAYS. TOLLESON
.LONG TERM...ONSHORE FLOW PICKS UP AS AN UPPER LEVEL TROUGH SETS UP
IN THE EASTERN PACIFIC BRINGING CLOUDS AND RELATIVELY COOLER TEMPS TO
THE AREA. THE PATTERN BECOMES MORE UNSETTLED WITH THE POSSIBILITY FOR
AFTERNOON SHOWERS AND MAYBE TSTMS IN THE CASCADES THU AND FRI.
EVENTUALLY THE SHOWER THREAT WILL SPREAD ACROSS THE ENTIRE FORECAST
AREA BY SAT AS THE LOW ASSOCIATED WITH THE TROUGH MOVES INLAND/CLOSE
TO SHORE. STILL QUITE A BIT OF UNCERTAINTY ASSOCIATED WITH THE TIMING
OF THE LOWS DEVELOPMENT THUS KEPT POPS RATHER LOW UNTIL CONFIDENCE
INCREASES. WOLFE
&&
.AVIATION...TWO GENERAL AREAS OF CONCERN THIS EVENING AND
OVERNIGHT...MARINE STRATUS ALONG THE COAST AND CONVECTIVE ACTIVITY
INLAND. ALONG THE COAST...MVFR TO IFR STRATUS DECK JUST OFFSHORE AND
FLIRTING ALONG THE COAST IS EXPECTED TO DEEPEN AND SURGE INLAND OVER
THE IMMEDIATE COAST LATER TONIGHT UNDER SLIGHTLY STRENGTHENING
ONSHORE FLOW...POSSIBLY MAKING ITS WAY DOWN THE COLUMBIA RIVER AND
THROUGH LOWER COASTAL GAPS INTO MON MORNING. INLAND CONDITIONS ARE
VFR AND WILL REMAIN THAT WAY FOR NEXT 24 HRS. SOME CLOUDS AND
INSTABILITY WILL RESULT IN THUNDERSTORMS OVER THE CENTRAL CASCADES
THIS AFTERNOON AND EVENING...THEN SPREAD NORTH OVERNIGHT. A FEW
STORMS COULD DRIFT OVER THE WESTERN VALLEYS LATER THIS EVENING INTO
OVERNIGHT.
KPDX AND APPROACHES...VFR CONDITIONS WILL CONTINUE IN THE KPDX AREA
THIS EVENING AND OVERNIGHT. THERE WILL BE A THREAT OF THUNDERSTORMS
DEVELOPING DURING THE EVENING IN THE KPDX AREA AND THIS THREAT WILL
CONTINUE OVERNIGHT.
&&
.MARINE...HIGH PRESSURE RETURNING OVER THE WATERS THIS EVENING WITH
THERMAL TROUGH WELL INLAND THIS EVENING WILL HELP SLIGHTLY
STRENGTHEN THE ONSHORE FLOW OVERNIGHT. WINDS WILL REMAIN BELOW SMALL
CRAFT TONIGHT AND SEAS WILL REMAIN BELOW 10 FEET.
&&
.PQR WATCHES/WARNINGS/ADVISORIES...
OR/WA...SMALL CRAFT ADVISORY FOR ROUGH COLUMBIA BAR EARLY MONDAY
MORNING.
HEAT ADVISORY FOR ALL THE INTERIOR LOWLANDS AND CASCADE
FOOTHILLS EXCEPT FOR THE S WILLAMETTE VALLEY THROUGH THIS
EVENING.
&&
.PRELIMINARY POINT POPS (PROBABILITY OF MEASURABLE PRECIPITATION)
AST 11--11 PDX 311-11 SLE 311-11 EUG 311-11
MORE WEATHER INFORMATION ONLINE AT...
HTTP://WEATHER.GOV/PORTLAND
THIS DISCUSSION IS FOR NORTHWEST OREGON AND SOUTHWEST WASHINGTON FROM
THE CASCADE CREST TO 60 NAUTICAL MILES OFFSHORE. THE AREA IS COMMONLY
REFERRED TO AS THE FORECAST AREA.HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE PORTLAND OR 501 PM PDT SUN JUN 29 2008 ORZ010-011-WAZ019-040-301345- NORTHERN OREGON CASCADE FOOTHILLS-NORTHERN OREGON CASCADES- SOUTH WASHINGTON CASCADES-SOUTH WASHINGTON CASCADE FOOTHILLS- 501 PM PDT SUN JUN 29 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST OREGON AND SOUTHWEST WASHINGTON. .DAY ONE...TONIGHT SCATTERED THUNDERSTORMS WILL CONTINUE INTO THIS EVENING...WITH ISOLATED SEVERE THUNDERSTORMS POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER REPORTS OF THUNDERSTORMS WITH HAIL AND STRONG WINDS ARE ENCOURAGED THIS EVENING. ORZ001>009-012>014-PZZ210-WAZ020>023-039-301345- NORTH OREGON COAST-CENTRAL OREGON COAST- COAST RANGE OF NORTHWEST OREGON- CENTRAL COAST RANGE OF WESTERN OREGON-LOWER COLUMBIA- GREATER PORTLAND METRO AREA-CENTRAL WILLAMETTE VALLEY- SOUTH WILLAMETTE VALLEY-WESTERN COLUMBIA RIVER GORGE- CASCADE FOOTHILLS IN LANE COUNTY-CASCADES IN LANE COUNTY- UPPER HOOD RIVER VALLEY-COLUMBIA RIVER BAR-WILLAPA HILLS- SOUTH WASHINGTON COAST-I-5 CORRIDOR IN COWLITZ COUNTY- GREATER VANCOUVER AREA- 501 PM PDT SUN JUN 29 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST OREGON...NORTHWEST OREGON AND SOUTHWEST WASHINGTON COASTAL WATERS AND SOUTHWEST WASHINGTON. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The Portland,OR radar (KRTX), 28 km away, was scanning. The volume nearest the first event began at 00:12 UTC.
6 thunderstorm wind. Local standard time, as filed.
The wind toppled a small tree, which fell onto the roadway.
A gust of wind knocked power lines down.
A wind gust knocked a small tree down, blocking a roadway.
A wind gust knocked power lines down, and resulted in quite a lot of tree debris on the road.
A few wind-fallen trees were blocking a roadway.
Lots of tree debris reported on the highway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2008Every state in 2008This day in weather historyWarnings in Washington, June 2008
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: 115004, 115006, 115008, 115009, 115010, 115013.