A strong cold front swept across the Intermountain Region and kicked off strong to severe storms over parts of northeast Baker County in Eastern Oregon.
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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.
A strong cold front swept across the Intermountain Region and kicked off strong to severe storms over parts of northeast Baker County in Eastern 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 Apr 21, 1:25 PM PST, 4 hours 49 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 325 PM MDT TUE APR 21 2009 .SHORT TERM...CONVECTIVE INSTABILITY IS BEGINNING TO BE RELEASED OVER OREGON AND SOUTH OF THE SNAKE RIVER IN SOUTHWEST IDAHO. STILL ANTICIPATING ONLY SLIGHT CHANCE FOR THUNDER THIS EVENING MAINLY OVER THE BLUES OF OREGON AND A SMALL PART OF THE WEST CENTRAL MOUNTAINS WITH A NARROW BAND OF MINUS 1 LI/S AND A FEW HUNDRED CAPE. AS THE UPPER RIDGE BREAKS DOWN ON WEDNESDAY AND WESTERLY FLOW INCREASES...A LITTLE MORE CONVECTION IS FORECAST ASSOCIATED WITH A WEAK SHORT WAVE AND MID LEVEL MOISTURE MOVING THROUGH THE INCREASED FLOW. ANY CONVECTION WEDNESDAY SHOULD BE FURTHER EAST AND SOUTH FROM WHERE IT IS TODAY AS A COLD FRONT APPROACHES FROM THE WEST. ALL ACTIVITY FORECAST WELL BELOW SEVERE POTENTIAL. ANOTHER VERY WARM DAY IS ANTICIPATED FOR WEDNESDAY BUT NOT QUITE THE RECORD OR NEAR RECORD WARMTH OF TODAY. NEVERTHELESS...TEMPERATURES WEDNESDAY WILL AGAIN AVERAGE ABOUT 15 DEGREES ABOVE NORMAL FOR ONE MORE DAY. THE WARM TEMPERATURES ABRUPTLY COME TO AN END ON THURSDAY WITH ALL MODEL GUIDANCE INDICATING NOTHING MORE THAN THE UPPER 50S OVER BOISE AND TWIN FALLS WHILE 40S WILL BE COMMON OVER THE MOUNTAINS. SNOW LEVELS COME CRASHING DOWN BEHIND FRONTAL ZONE WITH 9000 FEET OVER THE TWIN FALLS AREA FALLING TO THE 4400 FOOT LEVEL NEAR BAKER CITY. THUS...SNOW SHOWERS REAPPEAR IN THE PICTURE AND WILL BE THE DOMINANT PRECIP TYPE IN THE MOUNTAINS BY THURSDAY EVENING. HAVE INCREASED WINDS ALONG AND BEHIND COLD FRONT FOR THURSDAY AS STRONG UPPER LEVEL JETSTREAM COMES SOUTH AROUND THE BASE OF THE LONG WAVE TROF OVER THE PACIFIC NORTHWEST BRINGING COLD AIR...BREEZY AND UNSETTLED CONDITIONS INTO THE WEEKEND AND BEYOND. .LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...UNSETTLED PATTERN THROUGH THE EXTENDED PERIOD WITH LONGWAVE TROUGH POSITIONED OVER THE PAC NW. FOR FRIDAY DAYTIME INSTABILITY WILL SUPPORT CHANCE OF SHOWERS ALL LOCATIONS...WITH GREATER COVERAGE OVER THE MOUNTAINS. A SERIES OF SYSTEMS DROPPING INTO THE TROUGH WILL INCREASE CHANCE OF PRECIP EARLY SAT AND AGAIN SUNDAY...THOUGH TIMING OF THESE FEATURES COULD CHANGE. MONDAY AND TUESDAY MODELS INDICATE THAT THE UPPER LEVEL TROUGH WILL BEGIN TO MOVE EAST BUT WITH LATEST TRENDS THE TIMING OF THIS MAY BE SLOWED. WILL KEEP POPS NEAR CLIMATOLOGY FOR MONDAY AND TUESDAY. TEMPS THROUGH THE PERIOD WILL BE 5-10F DEGREES BELOW NORMAL AND THERE REMAINS A GOOD CHANCE FOR MANY VALLEY LOCATIONS TO GET FROST OR FREEZE FRI/SAT/SUN MORNINGS. && .AVIATION...VFR THROUGH WEDNESDAY. ISOLATED HIGH BASED SHOWERS AND A POSSIBLE THUNDERSTORM OVER WEST CENTRAL MTNS /KMYL NORTH AND WEST/ AND BAKER COUNTY OREGON THROUGH EARLY THIS EVENING AND AGAIN WEDNESDAY...BASES 10-13K FEET MSL. LIGHT WINDS SURFACE AND ALOFT TONIGHT...INCREASING WEDNESDAY AFTERNOON. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && WEATHER.GOV/BOISE SHORT TERM...GS LONG TERM....DG/JA AVIATION.....DG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 547 AM MDT TUE APR 21 2009 IDZ011>016-028>030-ORZ061>064-221200- 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- 547 AM MDT TUE APR 21 2009 /447 AM PDT TUE APR 21 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...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
729 PM MDT TUE APR 21 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0726 PM HAIL 5 N HALFWAY 44.94N 117.12W
04/21/2009 E1.00 INCH BAKER OR TRAINED SPOTTER
TRAINED SPOTTER REPORTED THUNDERSTORM WITH HAIL SIZES UP
TO ONE INCH IN DIAMETER.
&&
MTHIMMESSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BOISE ID 758 PM MDT FRI APR 10 2009 0RZ062-220300- BAKER COUNTY- 758 PM MDT FRI APR 10 2009 AT 655 PM PDT BOISE DOPPLER WEATHER RADAR SHOWED A STRONG THUNDERSTORM PROBABLY CONTAINING HAIL IN THE SOUTHEAST PART OF BAKER COUNTY MOVING DUE EAST AROUND 15 MPH. THE STORM WILL CROSS INTERSTATE 84 NEAR WEATHERFORD AROUND 715 PM PDT.
SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE BOISE ID 759 PM MDT TUE APR 21 2009 0RZ062-220300- BAKER COUNTY- 759 PM MDT TUE APR 21 2009 AT 655 PM PDT BOISE DOPPLER WEATHER RADAR SHOWED A STRONG THUNDERSTORM PROBABLY CONTAINING HAIL IN THE SOUTHEAST PART OF BAKER COUNTY MOVING DUE EAST AROUND 15 MPH. THE STORM WILL CROSS INTERSTATE 84 NEAR WEATHERFORD AROUND 715 PM PDT.
The Pendleton radar (KPDT), 159 km away, was scanning. The volume nearest the first event began at 02:15 UTC.
1 hail. Local standard time, as filed.
A trained spotter reported a thunderstorm with hail sizes up to one inch in diameter.
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, April 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: 158574.