Flash floods left mud and debris across Highway 20 northwest of Rainy Pass. The road was closed for nearly a week and suffered some damage.
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 SEW wrote it up.
Flash floods left mud and debris across Highway 20 northwest of Rainy Pass. The road was closed for nearly a week and suffered some damage. Cascade River road was also damaged.
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 Seattle, WA wrote its last area forecast discussion before the first event at Aug 10, 7:51 PM PST, 4 hours 9 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
851 PM PDT SAT AUG 10 2013
.SYNOPSIS...AN UPPER LOW OVER SOUTHWEST OREGON WILL CONTINUE MOVING
NORTH AND WEST REACHING THE WASHINGTON COASTAL WATERS MONDAY
MORNING. THIS SLOWLY MOVING SYSTEM WILL CONTINUE TO SUPPORT A
RELATIVELY MOIST AND UNSTABLE AIR MASS WITH SCATTERED THUNDERSTORMS
OVER THE AREA THROUGH SUNDAY NIGHT. THE THREAT OF THUNDERSTORMS WILL
LINGER OVER THE CASCADES ON MONDAY AS THE UPPER LOW WEAKENS AND
LIFTS NORTH OF THE AREA INTO BRITISH COLUMBIA. UPPER LEVEL RIDGING
WILL BEGIN TO BUILD BACK OVER THE REGION WEDNESDAY AND SHIFT EAST
THURSDAY AND FRIDAY AS AN UPPER LEVEL TROUGH APPROACHES FROM THE
WEST.
&&
.SHORT TERM...THUNDERSTORMS ARE THE MAIN FOCUS ONCE AGAIN ACROSS
WESTERN WA TONIGHT. SO FAR MOST OF THE ACTIVITY HAS BEEN NEAR THE
CASCADE CREST. BUT OVERALL THESE CELLS LOOK WEAKER COMPARED TO THE
ACTION LAST NIGHT. THAT BEING SAID...WATER VAPOR IMAGERY STILL SHOWS
PLENTY OF MID LEVEL MOISTURE WRAPPING WEST INTO THE REGION AND WILL
LIKELY SEE T-STORM ACTIVITY THROUGH EARLY SUN MORNING. THE CASCADES
WILL SEE THE BULK OF THE ACTION BUT CANNOT RULE OUT A FEW CELLS
DRIFTING WEST INTO THE LOWLANDS.
THE THREAT OF ADDITIONAL THUNDERSTORMS CONTINUES ON SUNDAY AS THE
UPPER LEVEL LOW SHIFTS NORTH AND SPINS OFF THE WA COAST. THE HIGHEST
INSTABILITY IS AGAIN OVER THE CASCADES BUT WITH THE LOW CENTER IN
THE VICINITY THERE IS A CHANCE OF ISOLD THUNDERSTORMS ACROSS ALL OF
WESTERN WA. THIS SYSTEM WILL FINALLY EXIT AND WEAKEN SUN NIGHT AS IT
LIFTS FARTHER NORTH/NORTHWEST INTO THE OFFSHORE WATERS. THE MOISTURE
TAP IS CUT OFF FROM WESTERN WA AND THE THREAT OF THUNDERSTORMS WILL
DIMINISH.
MONDAY IS LOOKING DRY FOR A BREAK IN THE WEATHER. ONSHORE FLOW WILL
PREVAIL WITH TEMPS NEAR NORMAL. THE FLOW ALOFT IS SW BUT LOOKS LIKE
THE MOISTURE WILL BE LACKING. WE CURRENTLY HAVE A CHANCE OF
THUNDERSTORMS IN THE CASCADES BUT THIS IS LOOKING SLIM AS THE MODELS
ARE BACKING OFF. 33
.LONG TERM...PREVIOUS DISCUSSION...THE UPPER LEVEL LOW WILL MOVE
INLAND INTO BRITISH COLUMBIA TUESDAY AS A DEEPER UPPER LEVEL LOW
MOVES INSIDE OF 140 W. MODELS SHOWING THE LOW WEAKENING AND MOVING
NORTH WITH LITTLE IMPACT ON WESTERN WASHINGTON. THE OFFSHORE UPPER
LEVEL LOW WILL LINGER AT AROUND 135 W THROUGH THE REMAINDER OF THE
WEEK ALLOWING AN UPPER LEVEL RIDGE TO BUILD OVER THE WEST AND A
RETURN TO SOUTHWEST FLOW ALOFT OVER THE PACIFIC NORTHWEST. THE
OFFSHORE UPPER LEVEL LOW SHIFTS EAST WEDNESDAY...NUDGING THE RIDGE
AXIS EAST A BIT. SOME OF THE MODEL HINTING AT A THREAT OF
PRECIPITATION THURSDAY AFTERNOON AND EVENING AHEAD OF THIS SYSTEM.
OTHERWISE EXPECT A VERY TYPICAL PATTERN WITH LOW LEVEL ONSHORE FLOW
AND MORNING CLOUDS AND AFTERNOON CLEARING WITH NEAR NORMAL
TEMPERATURES SET UP WEDNESDAY THROUGH SATURDAY.
&&
.AVIATION...AN UPPER LOW NEAR NORTH BEND OREGON WILL MOVE SLOWLY
NORTH TO NEAR ASTORIA OREGON BY SUNDAY AFTERNOON. AT THE SURFACE...
HIGH PRESSURE WILL REMAIN OFFSHORE WITH LOWER PRESSURE EAST OF THE
CASCADES. AIR MASS UNSTABLE...ESPECIALLY EAST OF PUGET SOUND.
THERE WILL BE SCATTERED THUNDERSTORMS OVER THE CASCADES TONIGHT AND
SUNDAY. SOME OF THESE COULD DRIFT WEST OVER THE PUGET SOUND LOWLANDS
IN SOUTHEASTERLY FLOW ALOFT. ANY STORMS THAT DO DRIFT WEST WILL HAVE
A TENDENCY TO WEAKEN AND FIZZLE AS THEY MOVE OVER THE MARINE LAYER.
LOW CLOUDS ALONG THE COAST WILL SPREAD INLAND LATER TONIGHT UNDER
CONTINUED ONSHORE FLOW. MUCH OF THE INTERIOR FROM PUGET SOUND
WESTWARD WILL HAVE LOW CLOUDS BY SUNDAY MORNING...SIMILAR TO WHAT
HAPPENED THIS MORNING. THE LOW CLOUDS WILL BE A SHALLOW AND NOT
CONTINUOUS SOME HOLES OVER THE CENTRAL SOUND...FAR NORTH INTERIOR...
AND EAST OF PUGET SOUND.
KSEA...THERE IS A CHANCE OF THUNDER TONIGHT AND SUNDAY AT THE
TERMINAL. FOR NOW...THE BEST CHANCES LOOK TO BE THIS EVENING AND
INTO EARLY SUNDAY MORNING. COASTAL STRATUS IS ALSO EXPECTED TO REACH
THE TERMINAL SHORTLY AFTER SUNRISE SUNDAY MORNING...PROBABLY IN THE
FORM OF VERY LOW CEILINGS OR FOG. THIS SHOULD BURN OFF BY AROUND
NOON. SOUTHERLY WIND 3-6 KNOTS. SCHNEIDER
&&
.MARINE...HIGH PRESSURE WILL REMAIN OFFSHORE WITH LOWER PRESSURE
EAST OF THE CASCADES FOR THE NEXT SEVERAL DAYS. THIS PATTERN WILL
PRODUCE SMALL CRAFT ADVISORY WEST WINDS IN THE CENTRAL AND EASTERN
STRAIT EACH DAY...WITH THE STRONGEST WINDS DURING THE EVENING HOURS
INTO THE EARLY MORNING HOURS. THERE IS A CHANCE WINDS COULD REACH
MARGINAL GALE IN THE STRAIT ANY GIVEN EVENING FOR THE NEXT FEW DAYS
BUT THE FORECAST IS SMALL CRAFT WINDS FOR NOW. WINDS ARE EXPECTED TO
REMAIN BELOW SMALL CRAFT ADVISORY OVER THE REST OF THE WATERS.
SCHNEIDER
&&
.FIRE WEATHER...PREVIOUS DISCUSSION...LOOKS LIKE A NEAR-REPEAT OF
LAST NIGHT'S LIGHTNING OCCURRING AGAIN TONIGHT. OF COURSE...THE
FIRE-RELATED CONCERN WILL BE NEW FIRE STARTS FROM LIGHTNING. ALREADY
HAVE STORMS DEVELOPING JUST EAST OF MOUNT RAINIER THAT WILL BE
POISED TO SPREAD NORTHWEST ACROSS THE LOWLANDS THIS EVENING AND
OVERNIGHT. CURRENT ROUND OF RED FLAG WARNINGS WILL REMAIN IN
EFFECT. HANER
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...RED FLAG WARNINGS IN EFFECT UNTIL SUNDAY FOR THE CASCADES...
CENTRAL...SOUTH AND EAST PUGET SOUND LOWLANDS...THE SOUTHWEST
INTERIOR LOWLANDS...AND THE EASTERN OLYMPIC MOUNTAINS.
PZ...SMALL CRAFT ADVISORY CENTRAL AND EASTERN STRAIT.
&&
WWW.WEATHER.GOV/SEATTLE
YOU CAN SEE AN ILLUSTRATED VERSION OF THE FORECAST DISCUSSION AT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTMLThe Seattle radar (KATX), 90 km away, was scanning. The volume nearest the first event began at 08:01 UTC.
1 flash flood. Local standard time, as filed.
Flash floods left mud and debris across Highway 20 northwest of Rainy Pass. The road was closed for nearly a week and suffered some damage. Cascade River Road was also damaged.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2013Every state in 2013This day in weather historyWarnings in Washington, August 2013
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: 474614.