A nearly stationary upper level low over the Four Corners region brought periods of heavy rain and thunderstorms which caused localized urban flooding in south central Idaho. 50 inches, but the previous days rainfall made areas more prone to localized flooding.
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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 nearly stationary upper level low over the Four Corners region brought periods of heavy rain and thunderstorms which caused localized urban flooding in south central Idaho. Rainfall totals were around 0.50 inches, but the previous days rainfall made areas more prone to localized flooding.
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 12, 1:40 PM MST, 29 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 240 PM MDT Mon Jun 12 2023 .SHORT TERM...Tonight through Wednesday night...The pattern will remain nearly unchanged through Tuesday across southwest Idaho and southeast Oregon. A trough remains centered over southern NV and UT, bringing and east-northeast flow aloft through Tuesday as the system slowly tracks across southern UT. Precipitable water values remain high over southwest Idaho and southeast Oregon, with values in the 95th percentile for this time of year. Showers and thunderstorms are anticipated this afternoon and Tuesday afternoon, with the best chance of storms over the southwest Idaho mountains (60-90% chance) and lower chances across eastern OR (generally 20-50% chance). Storm motion is generally under 10kts, and wind shear aloft is under 20kts, so storms will be disorganized and of pulse type. Storms this afternoon and Tuesday afternoon will be capable of producing very heavy rain over a short period of time. The storms will generally form over the higher terrain and weaken as they move into the lower elevations, like the Snake Basin (Treasure Valley). Storms will also form along existing outflow boundaries. Thunderstorms will be capable of wind gusts up to 40 mph, very heavy rain and small hail. A low pressure system will track across southwest Canada on Tuesday night, bringing a dry cold front to the area. This front will usher in drier air from the northwest and end the shower and thunderstorm threat on Wednesday. Temperatures behind the front will drop around 5 degrees, with relative humidities will be noticeably drier on Wednesday. .LONG TERM...Thursday through Monday...Dry northwest flow continues into Saturday with a warming trend. Temperatures will warm a few degrees each day into Saturday, with values around 5 degrees above normal. An unseasonably strong upper level trough arrives from the Gulf of Alaska on Sunday, bringing increased shower chances (20-40% chance), and much cooler temperatures (around 15-20 degrees cooler, and around 10-15 degrees below normal) by Monday. && .AVIATION...Mainly VFR. Showers and thunderstorms increase across E Oregon and SW Idaho after Mon/18z, creating local MVFR conditions. Storms will be capable of gusty outflow winds to 35 kt, mountain obscurations, heavy rain, and small hail. Surface winds outside of thunderstorms: variable less than 10 kt, becoming NW-N 5-15 kt Monday afternoon. Winds aloft at 10kft MSL: generally NW-NE 10-20 kt. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise SHORT TERM...KA LONG TERM....KA AVIATION.....KA
Special Weather Statement
National Weather Service Boise ID
137 PM PDT Mon Jun 12 2023
ORZ063-122115-
Malheur County OR-
137 PM PDT Mon Jun 12 2023
...A strong thunderstorm will impact portions of west central Malheur
County through 215 PM PDT...
At 137 PM PDT, Doppler radar was tracking a strong thunderstorm near
Iron Point, or 24 miles north of Rome, moving southwest at 10 mph.
HAZARD...Winds in excess of 30 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Iron Point around 250 PM MDT.
Sacramento Butte around 300 PM MDT.
Saddle Butte around 310 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4329 11772 4317 11754 4294 11775 4312 11802
TIME...MOT...LOC 2037Z 042DEG 8KT 4318 11770
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
KAThe Boise radar (KCBX), 74 km away, was scanning. The volume nearest the first event began at 21:09 UTC.
3 flood, 2 heavy rain, 1 thunderstorm wind. Local standard time, as filed.
The mesonet station, WAGI1, near Featherville, ID measured 0.56 inches of heavy rainfall.
Minor flooding was reported on Highway US-95 from Mile Post 0-35.
The mesonet station, DW9477, near Minden, ID measured 0.48 inches of heavy rain.
Water and mud was reported flowing over Highway 78 near mile post 28.
A large tree was reported down across the Greenbelt Bike Path.
Street flooding with eight inches of standing water over the roads in Eagle was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2023Every state in 2023This day in weather historyWarnings in Idaho, June 2023
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: 1108883, 1108877, 1108884, 1108878, 1108882, 1108880.