An upper level wave of low pressure moving into Southeast Oregon from the California coast aided in thunderstorm development across parts of Harney County near Burns, Oregon.
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The episode as NWS BOI wrote it up.
An upper level wave of low pressure moving into Southeast Oregon from the California coast aided in thunderstorm development across parts of Harney County near Burns, Oregon.
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 Jul 3, 12:10 PM PST, 1 hour 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 210 PM MDT FRI JUL 3 2009 .SHORT TERM...TONIGHT THROUGH SUNDAY...STORMS HAVE DEVELOPED AS EXPECTED THIS AFTERNOON...AND ARE EXPECTED TO LAST INTO THE EVENING HOURS. POPS HAVE BEEN RAISED...ESPECIALLY IN THE SOUTH AND EAST PORTIONS OF OUR CWA. HEAVY RAIN AND STRONG WINDS ARE POSSIBLE WITH THESE STORMS. TEMPS WILL REMAIN HOT FOR THE 4TH...AND THEN GET EVEN HOTTER FOR THE 5TH. TEMPS IN THE TREASURE VALLEY WILL BE NEAR 100 DEGREES SUNDAY AFTERNOON. STORMS WILL ONCE AGAIN DEVELOP... BUT THIS TIME MAINLY IN THE EASTERN THIRD OF THE CWA. OVERNIGHT LOWS WILL CONTINUE TO BE ABOVE-NORMAL THROUGH SUNDAY. A MAJOR PATTERN SHIFT BEGINS LATE SUNDAY AS A LARGE UPPER LEVEL TROUGH MOVES TOWARD THE PAC NW. .LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...MODELS AGREE ON THE UNSEASONABLY COOL UPPER LEVEL TROUGH REMAINING ANCHORED OVER THE WEST COAST THROUGH THE PERIOD. THIS KEEPS OUR CWA UNDER A DRY SOUTHWEST FLOW BETWEEN THIS TROUGH AND THE UPPER LEVEL RIDGE CENTERED NEAR THE MEXICAN BORDER...DISPLACED AROUND 400 MILES SOUTH OF ITS NORMAL SUMMER POSITION. WE ARE WEIGHTING BOTH POPS AND TEMPERATURES TOWARD THE FAVORED ECMWF...AND CLIMATOLOGY. BEST CHANCES OF PRECIPITATION WILL BE OVER OUR NORTHERN ZONES TOWARD THE CYCLONIC SHEAR SIDE OF THE JET AND COOLER AIR ALOFT...WITH OUR SOUTHERN BORDER AREA REMAINING DRY. WE ARE HOLDING POPS TO SLIGHT CHANCE OR LESS THROUGH THE PERIOD ACROSS MOST OF THE AREA. MAX TEMPERATURES WILL BE 5-10 DEGREES BELOW NORMAL WITH MINS UP TO 5 DEGREES BELOW NORMAL. && .AVIATION...SCATTERED THUNDERSTORMS WILL CONTINUE THROUGH THIS EVENING WITH THE STRONGER STORMS SOUTH AND EAST OF KBOI. CONDITIONS WILL BE MAINLY VFR...WITH LOCAL MVFR IN HEAVY SHOWERS OR BLOWING DUST. SCATTERED THUNDERSTORMS WILL REDEVELOP SATURDAY AFTERNOON ...DECREASING IN COVERAGE TO ISOLATED ON SUNDAY. SURFACE WINDS WILL BE GUSTY AND ERRATIC NEAR THUNDERSTORMS...WITH LIGHT WINDS ELSEWHERE. WINDS ALOFT WILL BE LIGHT SOUTHWEST. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && WEATHER.GOV/BOISE SHORT TERM...SP LONG TERM....JT/MT AVIATION.....JT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 536 AM MDT FRI JUL 3 2009 IDZ011>016-028>030-ORZ061>064-041200- 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- 536 AM MDT FRI JUL 3 2009 /436 AM PDT FRI JUL 3 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 NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The Boise radar (KCBX), 228 km away, was scanning. The volume nearest the first event began at 21:28 UTC.
1 hail. Local standard time, as filed.
A trained spotter reported hail ranging from one half to three quarters of an inch.
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, July 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: 184331.