An upper low drifted slowly across Southeast Oregon on June 13th with abundant moisture surging ahead of the system including high intensity rainfall in localized showers and thunderstorms that resulted in flash flooding in Unity, Oregon and mud slides at Leslie Gulch Canyon.
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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 BOI wrote it up.
An upper low drifted slowly across Southeast Oregon on June 13th with abundant moisture surging ahead of the system including high intensity rainfall in localized showers and thunderstorms that resulted in flash flooding in Unity, Oregon and mud slides at Leslie Gulch Canyon.
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 Boise, ID wrote its last area forecast discussion before the first event at Jun 13, 1:30 PM PST, 30 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
330 PM MDT SAT JUN 13 2009
.SHORT TERM...HIGH INTENSITY RAINFALL IN LOCALIZED SHOWERS AND
THUNDERSTORMS HAS COMMENCED OVER THE AREA. MOSTLY LIGHT TO MODERATE
SHOWERS ON RADAR PRESENTLY BUT ISOLATED HEAVIER THUNDERSTORMS
PRODUCING HEAVY RAIN IN A FEW PLACES. A COUPLE SPOTTER REPORTS OF
HALF INCH AMOUNTS IN 30 MINUTES OR LESS. ONE AREA OF PARTICULAR
CONCERN IS NORTHWEST OWYHEE COUNTY BETWEEN MARSING AND HOMEDALE IN
ADDITION TO THE LOWER TREASURE VALLEY OF IDAHO AND THE CANYONLANDS IN
NORTHERN MALHEUR COUNTY OREGON. THINK COVERAGE OF RAIN AND EMBEDDED
CONVECTION WILL INCREASE IN THE NEXT FEW HOURS WITH BULK OF RAINFALL
OVER THE FORECAST AREA OCCURRING BETWEEN MIDNIGHT AND NOON SUNDAY.
UPPER LOW CURRENTLY DRIFTING SLOWLY EAST AND WILL BE POSITIONED OVER
SOUTHEAST OREGON LATE TONIGHT WITH ABUNDANT MOISTURE SURGING
NORTHWARD EAST OF THE LOW AND EVENTUALLY WRAPPING BACK AROUND THE
FEATURE ON SUNDAY. ALL STORMS AT THE CURRENT TIME ARE BELOW SEVERE
LEVELS IN WIND SPEED AND HAIL SIZE WITH THE MAIN THREAT CONTINUING
TO BE LOCALLY HEAVY RAIN AND POSSIBLE FLASH FLOODING. A FLASH FLOOD
WATCH CONTINUES THROUGH SUNDAY.
.LONG TERM...MONDAY NIGHT THROUGH SATURDAY...CHANCES FOR SHOWERS AND
THUNDERSTORMS CONTINUE MONDAY NIGHT AS THE UPPER LOW /CURRENTLY OVER
NRN CA/ TRANSITIONS ACROSS IDAHO TOWARD WRN MONTANA. HOWEVER...
RAINFALL AMOUNTS LOOK TO BE CONSIDERABLY SMALLER THAN THOSE EXPECTED
THIS WEEKEND. INSTABILITY PARAMETERS WARRANT CHANCES FOR SHOWERS AND
THUNDERSTORMS ON TUESDAY /UNDER SPLIT FLOW/ AS WELL. ANOTHER PACIFIC
TROUGH IS PROGGED TO DIG ACROSS N IDAHO ON WEDNESDAY FOR ANOTHER
ROUND OF PRECIPITATION. MORE ORGANIZED DYNAMICS WARRANT
THUNDERSTORMS WEDNESDAY EVENING - BUT COVERAGE AND LOCATION WILL
DEPEND ON TIMING OF THIS WAVE. WARMER/DRIER THURSDAY THROUGH
SATURDAY AS FLOW BECOMES DRIER AND MORE ZONAL.
.AVIATION...NUMEROUS RAIN SHOWERS WITH EMBEDDED THUNDERSTORMS
THROUGH 06Z. SHOWERS/THUNDERSTORMS WILL BRING MVFR CIGS AND LOCAL
IFR IN HEAVY RAIN. MOUNTAINS WILL BE OBSCURED. AFTER 06Z...AREAS OF
MVFR AS SHOWERS CONTINUE OVERNIGHT. LIGHT SURFACE WINDS - EXCEPT IN
THE VICINITY OF THUNDERSTORMS.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...FLASH FLOOD WATCH CONTINUES THROUGH LATE SUNDAY NIGHT
IDZ011-IDZ012-IDZ013-IDZ014-IDZ015-IDZ016-IDZ028-IDZ029-
IDZ030.
OR...FLASH FLOOD WATCH CONTINUES THROUGH LATE
SUNDAY ORZ061-ORZ062-ORZ063-ORZ064.
&&
WEATHER.GOV/BOISE
SHORT TERM...GS
LONG TERM....MT/BB
AVIATION.....MTHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 614 AM MDT SAT JUN 13 2009 IDZ011>016-028>030-ORZ061>064-141215- WEST CENTRAL MOUNTAINS-LOWER TREASURE VALLEY ID-BOISE MOUNTAINS- UPPER TREASURE VALLEY-SOUTHWEST HIGHLANDS-WESTERN MAGIC VALLEY- CAMAS PRAIRIE-OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY- HARNEY COUNTY-BAKER COUNTY-MALHEUR COUNTY- LOWER TREASURE VALLEY OR- 614 AM MDT SAT JUN 13 2009 /514 AM PDT SAT JUN 13 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL IDAHO...SOUTHWEST IDAHO...WEST CENTRAL IDAHO...NORTHEAST OREGON AND SOUTHEAST OREGON. .DAY ONE...TODAY AND TONIGHT A FLASH FLOOD WATCH IS IN EFFECT TODAY AND TONIGHT FOR THE ENTIRE AREA. HEAVY RAIN FROM SLOW-MOVING THUNDERSTORMS WILL BE THE MAIN THREAT THROUGH THIS PERIOD. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE FLASH FLOOD WATCH EXTENDS TO MONDAY MORNING...WITH CONTINUED HEAVY RAIN POSSIBLE. .SPOTTER INFORMATION STATEMENT... REPORTS OF RAINFALL WILL BE GREATLY APPRECIATED THIS WEEKEND AS WE ATTEMPT TO SUPPLEMENT RADAR AND AUTOMATED RAIN GAGES WITH ADDITIONAL GROUND TRUTH INFORMATION.
The Pendleton radar (KPDT), 151 km away, was scanning. The volume nearest the first event began at 21:57 UTC.
2 flash flood. Local standard time, as filed.
A county official reported localized flash flooding and water running over culverts from 1.50 inches of rainfall in about 40 minutes.
Flash flooding resulting in mud slides at Leslie Gulch Canyon was reported by a BLM official.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2009Every state in 2009This day in weather historyWarnings in Oregon, June 2009
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: 179429, 179431.