Conditions were ripe for super cell development with large hail across Southeast Oregon.
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.
Conditions were ripe for super cell development with large hail across Southeast 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 Aug 9, 12:13 PM PST, 26 minutes earlier.
Area Forecast Discussion
National Weather Service Boise ID
213 PM MDT Fri Aug 9 2019
.SHORT TERM...Tonight through Monday...Showers and increasingly
strong thunderstorms tonight through Saturday night as Pacific
upper low/trough comes into southwest Oregon late tonight,
northeast Oregon Saturday, and exits across northern Idaho
Sunday. The trough will provide considerable dynamic support
for thunderstorms with greatest threat shifting from central
Oregon this evening, to central Idaho Saturday and Saturday
evening. NAM has LI below -4 and CAPE above 1500 j/kg across
Idaho north of the Snake Basin Saturday afternoon and evening,
and there will be increasing shear due to strengthening southwest
wind aloft east of the upper trough. SPC targets the same areas
for a slight chance of severe thunderstorms. Models are not yet
in agreement, so for now we will limit thunderstorm intensity
to include heavy rain, gusty winds, and small hail, with more
ordinary thunderstorms elsewhere. Late Saturday night southern
areas will clear but showers will linger north of the Snake Basin
through the night, with a chance of thunderstorms again in Baker
County/OR and Valley County/ID Sunday afternoon, ending late
Sunday night. Monday will be sunny and warmer in all areas as
the trough moves away. But Sunday will be unusually cool with
highs only in the 60s in the mountains and 70s in the valleys.
.LONG TERM...Monday night through Friday...Dry zonal flow to begin
the period out ahead of our next upper level trough. Models have
continued to show this trough drop along the coast midweek with
some differences on strength and precipitation placement. Kept the
current trend of introducing slight chances of precipitation with
afternoon thunderstorms back into the forecast for the end of the
period. Temperatures are expected to be below normal during this
time.
&&
.AVIATION...VFR. Scattered thunderstorms this afternoon pushing
north from Nevada. Strong outflow winds and heavy rains will be
the main threat with these storms. Surface winds, southwest-
southeast 10-15kts with gusts 25-30kts outside of thunderstorms.
Expect erratic, variable winds in and around thunderstorms with
gusts 35-45kts. Winds aloft to 10k feet MSL, southwest 15-20kts.
Weekend Outlook...Scattered to numerous showers and thunderstorms
through Saturday night, becoming confined to the north on Sunday.
Stronger storms will be capable of heavy rain with reduced
visibility. Potential for hail and strong outflow winds with
storms on Saturday. Surface winds predominantly southerly.
Winds aloft southwest to west around 15-25 kts.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until 6 AM MDT Saturday IDZ424-426.
Red Flag Warning until midnight MDT Saturday night
IDZ400>403-420-423.
OR...Red Flag Warning until midnight MDT /11 PM PDT/ Saturday night
ORZ636-637-646.
&&
www.weather.gov/Boise
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SHORT TERM...LC
LONG TERM....JC
AVIATION.....JCThe Boise radar (KCBX), 229 km away, was scanning. The volume nearest the first event began at 20:39 UTC.
1 hail. Local standard time, as filed.
BLM employees reported golf ball hail at the Frenchglen BLM office.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2019Every state in 2019This day in weather historyWarnings in Oregon, August 2019
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: 851148.