A deep low pressure system anchored in the Gulf of Alaska and a zonal flow pattern across the Pacific Northwest and Intermountain West provided the right ingredients for a sustained moisture plume which produced convection and periods of moderate to heavy rain over a three day period causing flooding and flash flooding, and severe thunderstorms across Southeast Oregon and Southwest Idaho.
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 BOI wrote it up.
A deep low pressure system anchored in the Gulf of Alaska and a zonal flow pattern across the Pacific Northwest and Intermountain West provided the right ingredients for a sustained moisture plume which produced convection and periods of moderate to heavy rain over a three day period causing flooding and flash flooding, and severe thunderstorms across Southeast Oregon and Southwest Idaho.
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 2, 7:47 PM PST, 3 hours 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 947 PM MDT WED JUN 2 2010 .DISCUSSION...MODERATE TO HEAVY RAIN IS CURRENTLY BEING MONITORED OVER THE HEADWATERS OF THE WEISER RIVER IN NORTHERN WASHINGTON AND ADAMS COUNTIES. PRECIP NOT CONVECTIVE...BUT STEADY WARM TOPPED STRATIFORM RAIN HAS BEEN OCCURRING FOR A COUPLE HOURS IN THIS REGION. THE HEAVIER RAIN BANDS ARE CURRENTLY OVER THE HIGHEST MOUNTAIN PEAKS IN THE SOUTHERN PAYETTE NATIONAL FOREST. THIS WILL FURTHER ENHANCE LIFT AND RAIN RATE EFFICIENCY FOR THE WEISER BASIN ONCE IT CROSSES TO THE EAST SIDE. THE WEISER RIVER AT CAMBRIDGE IS BEING MONITORED FOR RAPID RISES WHICH IT HAS DONE IN THE LAST 3-4 HOURS AND THIS WAS WITH LIGHTER BUT STEADY RAIN. NOT PLANNING ON ANY MAJOR CHANGES TO THE FORECAST AT THIS TIME. THE BACK EDGE OF THE FRONTAL BAND IS EXPECTED TO CROSS THE NORTHERN ZONES AROUND MIDNIGHT AND THE SOUTHERN HIGHLAND ZONES AND MAGIC VALLEY EARLY TOMORROW MORNING. && .AVIATION...WIDESPREAD RAIN AND MOUNTAIN OBSCURATION WILL CONTINUE THROUGH 12Z...WITH AREAS OF MVFR CEILINGS AND LOCAL IFR CONDITIONS IN THE MOUNTAIN VALLEYS. EXPECT GRADUAL IMPROVEMENT FROM THE WEST AFTER 12Z...THEN AFTER 18Z SCATTERED MVFR MOUNTAIN SHOWERS AND ISOLATED VFR VALLEY SHOWERS. SURFACE WINDS WILL BE LIGHT TO MODERATE SOUTHEAST TO SOUTHWEST...BECOMING WEST BRIEFLY GUSTING TO 30 KTS FOLLOWING A PACIFIC COLD FRONT REACHING KBOI ABOUT 06Z AND KTWF/ KJER ABOUT 10Z. WINDS ALOFT WILL BE WEST TO 40 KTS AT 12K FEET MSL. && .PREV DISCUSSION...TONIGHT THROUGH FRIDAY...WIDE SWATH OF RAIN HAS MADE VERY LITTLE SOUTHWARD ADVANCEMENT TODAY...WHICH WAS EXPECTED. LEADING EDGE IS STILL NEAR THE BOISE METRO...WITH LIGHT TO MODERATE RAIN OCCURRING WEST AND NORTH OF BOISE. SATELLITE IMAGERY SHOWS THE MAIN SYSTEM APPROACHING THE WEST COAST. THIS SYSTEM WILL MOVE THROUGH OUR AREA OVERNIGHT AND PUSH THE RAIN BAND SOUTHWARD. CONVECTION WILL BE LIMITED...THUS WE ARE NOT EXPECTING ANY HEAVY RAINFALL RATES. HOWEVER...TOTAL AMOUNTS WILL BE A HALF INCH TO AN INCH ACROSS THE NORTH WITH QUARTER TO HALF INCH AMOUNTS IN THE TREASURE VALLEY. LOCALLY HIGHER AMOUNTS ARE LIKELY. THERE WILL BE A LITTLE BIT OF A BREAK IN THE WIDESPREAD RAINS AS THE FIRST SYSTEM DEPARTS ON THURSDAY AND SECOND ONE ENTERS THE REGION LATE THURSDAY NIGHT INTO FRIDAY. THIS SECOND SYSTEM WILL TAKE A SIMILAR TRACK...BUT WITH POTENTIALLY HIGHER RAINFALL AMOUNTS. MODELS ARE ALSO INDICATING MORE INSTABILITY FRI AFT/EVE FOR A GREATER CONCERN OF THUNDERSTORMS PRODUCING HEAVY RAINFALL RATES...WHICH ALSO INCLUDES THE TREASURE VALLEY. SEE THE HYDRO SECTION BELOW FOR DETAILS ON POSSIBLE IMPACTS FROM THE HEAVY RAINS. STAYED WITH LATEST TRENDS IN FORECASTING OVERNIGHT LOW TEMPS ABOVE GUIDANCE AND DAYTIME TEMPS BELOW GUIDANCE DUE TO THE CLOUDS AND RAIN. LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...THE BIG QUESTION IS WHEN WILL THE ZONAL FIRE HOSE OF MOISTURE ACROSS THE PACIFIC GET CUT OFF. ALL MODELS ARE CONSISTENT IN SHOWING A RETROGRESSION OF THE BROAD LOW IN THE GULF OF ALASKA AND A SLIGHT AMPLIFICATION TO THE PATTERN TO END THE TROPICAL TAP. THE MODELS MAY BE A BIT QUICK IN CUTTING OFF THAT TAP HOWEVER...WITH A STRONG WSW BAND OF FLOW FORECAST TO CONTINUE ACROSS THE AREA INTO EARLY NEXT WEEK. THE NEXT SHORT-WAVE IN THAT FLOW WILL COME ACROSS OUR AREA SATURDAY NIGHT AND EARLY SUNDAY. WITH THAT RETROGRESSION OF THE LARGER SCALE TROF...EXPECT HEIGHTS TO RISE A LITTLE AND THE ZONE OF HEAVIER PRECIPITATION TO SHIFT A LITTLE NORTHWARD EARLY NEXT WEEK. STAY TUNED...BEYOND WEDNESDAY BOTH THE GFS AND ECMWF INDICATE AMPLIFICATION OF THE PATTERN AND A NEW TROF FORMING DOWNSTREAM FROM THAT RETROGRADING GULF TROF...RIGHT OVER THE PACIFIC NORTHWEST. && .HYDROLOGY...MODERATE RAIN OVER THE NEXT SEVERAL DAYS WILL LEAD TO SATURATED SOIL CONDITIONS ACROSS THE AREA. IN AREAS OF STEEP TERRAIN...MUD AND ROCK SLIDES BECOME MORE LIKELY AS THE SOIL BECOMES MORE SATURATED. HIGHER INTENSITY RAIN WHICH COULD OCCUR ON FRIDAY HAS THE POTENTIAL TO CAUSE FLASH FLOODING ON SMALL STREAMS OR DEBRIS FLOWS IN THE MOUNTAINS. IT IS STILL TOO EARLY TO FORECAST EXACT AMOUNTS OF PRECIPITATION WHICH WILL OCCUR...BUT THOSE PLANNING TO TRAVEL OR WORK IN THE MOUNTAINS ON FRIDAY SHOULD BE AWARE OF THE POTENTIAL FOR MUDSLIDES AND DEBRIS FLOWS. NO FLOODING ON LARGER RIVERS IS EXPECTED AT THIS TIME. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && WEATHER.GOV/BOISE DISCUSSION...GS PREV SHORT TERM...BW LONG TERM....JJ/DD AVIATION.....JT HYDROLOGY....JB
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 422 AM MDT WED JUN 2 2010 IDZ011-013-033-ORZ062-031030- WEST CENTRAL MOUNTAINS-BOISE MOUNTAINS-UPPER WEISER RIVER- BAKER COUNTY- 422 AM MDT WED JUN 2 2010 /322 AM PDT WED JUN 2 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL IDAHO AND NORTHEAST OREGON. .DAY ONE...TODAY AND TONIGHT ROUND ONE OF A PERIOD OF MODERATE RAIN IS EXPECTED TONIGHT. GREATEST AMOUNTS ARE EXPECTED IN THE WEST CENTRAL AND BOISE MOUNTAINS...BASIN AVERAGES OF 0.75 TO 1.00 INCHES TONIGHT. FLOODING IS NOT ANTICIPATED TONIGHT HOWEVER STREAMS AND RIVERS WILL START TO RISE. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE SECOND ROUND OF MODERATE RAIN WITH A BASIN AVERAGE OF 0.75 TO 1.00 INCHES IS ANTICIPATED LATE THURSDAY NIGHT AND FRIDAY MORNING. THIS SECOND ROUND WILL BE ASSOCIATED WITH INCREASED RUNOFF AS HIGH ELEVATION SNOWS MELT AND SOILS BECOME LESS ABLE TO HANDLE THE WATER. FLOODING IS NOT EXPECTED FRIDAY BUT SIGNIFICANT RISES ARE LIKELY AND THE HYDRO SITUATION WILL BE MONITORED CLOSELY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. IDZ012-014>016-028>030-ORZ061-063-064-031030- LOWER TREASURE VALLEY ID-UPPER TREASURE VALLEY- SOUTHWEST HIGHLANDS-WESTERN MAGIC VALLEY-CAMAS PRAIRIE- OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY-HARNEY COUNTY- MALHEUR COUNTY-LOWER TREASURE VALLEY OR- 422 AM MDT WED JUN 2 2010 /322 AM PDT WED JUN 2 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL IDAHO...SOUTHWEST IDAHO AND SOUTHEAST OREGON. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Baker County Sheriffs office reported 3 feet of water over State Highway 86 near Eagle Creek and a nearby rancher reported 4 feet of water in his fields.
Burns BLM Interagency dispatch reported Page Springs Campground was flooded.
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: 234972, 241757.