What forecasters said that day
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 26, 5:15 PM MST, 2 hours 15 minutes earlier. Its key messages:
- Scattered thunderstorms this afternoon into early Saturday could produce strong outflow winds, small hail and brief heavy rain.
- Temperatures around 15 to 20 degrees below normal Saturday and Sunday.
- Significant precipitation and light snow above 7000 feet possible Saturday through Sunday.
Area forecast discussion, Jun 26, 5:15 PM MST, 2 hours 15 minutes before
Area Forecast Discussion
National Weather Service Boise ID
615 PM MDT Fri Jun 26 2026
.UPDATE...Updated aviation discussion.
&&
.KEY MESSAGES...
- Scattered thunderstorms this afternoon into early Saturday
could produce strong outflow winds, small hail and brief heavy
rain.
- Temperatures around 15 to 20 degrees below normal Saturday and
Sunday.
- Significant precipitation and light snow above 7000 feet possible
Saturday through Sunday.
&&
.SHORT TERM /Through Sunday Night/...
Issued 213 PM MDT FRI JUN 26 2026
The main focus through late this evening will be the potential
for strong thunderstorms developing across the region. Clearing
of skies across southeast Oregon has allowed for surface heating
for modest instability (SBCAPE of 50 to 200 J/kg) and the
initiation of thunderstorms across southeast Oregon. Initial
convective activity will be capable of producing strong, erratic
outflow wind gusts up to 50 mph due to relatively dry low-
levels. However, as atmospheric moisture steadily increases
overnight, this severe wind threat will gradually diminish and
storms will produce brief heavy rain and small hail.
Thunderstorm activity is expected to persist through the
overnight hours and continue through Saturday across much of the
forecast area. With the added moisture, storms will become
capable of producing heavy rainfall and small hail. The best
dynamics, moisture pooling, and overall chance for storms and
heavier rainfall amounts will focus across southwest Idaho. The
potential for heavier rainfall across the central Idaho
mountains Saturday increases the potential for rock slides and
localized flooding especially near legacy burn scars, like the
Wapiti fire burn scar and will need to be monitored.
Convective activity and overall precipitation chances will
begin to taper off early Sunday as the system starts to exit the
region. Showers and thunderstorms will persist on the backside
of the low across the central Idaho mountains as well as Baker
County and along the Idaho/Nevada border.
Precipitation amounts of 1 to 1.25 inches are possible over the
central Idaho mountains through Sunday. Lesser amounts are
expected in eastern Oregon, where 0.25 to 0.75 inches is
forecast, while the Snake River Plain will generally see between
0.25 and 0.50 inches. Above 6500 feet could see up to 3 inches
of wet snow Saturday night into Sunday. Temperatures will
plummet to around 20 degrees below normal Saturday and Sunday.
Several locations are forecast to approach record low maximum
temperatures for the day both days. Near record low temperatures
are also possible across southeast Oregon Sunday morning.
&&
.LONG TERM /Monday through Friday/...
Issued 213 PM MDT FRI JUN 26 2026
Gradual warming and drying Monday and Tuesday as the weekend upper
low moves away into central Canada, but leaves behind weak residual
troughing for a continuing chance of showers and thunderstorms in
northern mountains. On Wednesday another cold upper level low will
approach from the BC coast. This second low is not as cold as the
current low and models are not yet in agreement about where it will
go, so forecast confidence beyond Wednesday is low. For now we're
going with the warmer ECMWF forecast which takes the low inland
across BC and Alberta, and keeps our CWA generally dry with
temperatures close to normal. We also have a slight chance of
showers and thunderstorms over northern mountains Thursday and
Friday. The GFS, on the other hand, would bring the low all the way
south to the southern Panhandle, with greater chances of showers and
thunderstorms, and temperatures well below normal again.
&&
.AVIATION /00Z Saturday through Sunday/...
Issued 555 PM MDT FRI JUN 26 2026
Generally VFR. Scattered/numerous showers and thunderstorms
bringing localized MVFR, erratic gusts to 25-35 kt, small hail,
and brief heavy rain. Lightning coverage will decrease
overnight, but increase again Sat morning. Mtns obscured.
Surface winds outside of storms: variable 5-15 kt, then W-NW
5-15 kt with gusts to 20-25 kt after Sat/16Z. Winds aloft at
10kft MSL: W-SW 15-25 kt.
KBOI...Generally VFR. Periods of rain showers continuing through
Saturday evening. Threat of thunderstorms this evening prior to
Sat/05Z, and again Sat afternoon. Thunderstorms capable of
gusts to 25-35 kt, brief heavy rain with lowered vis, and small
hail. Surface winds: variable 5-15 kt this evening, especially
around shower activity. Then, W-NW 5-15 kt overnight and Sat.
Weekend Outlook...Numerous showers through Sunday. Lightning
activity will taper off for Sat night/Sunday. Mtn obscuration.
Local MVFR/IFR over mountains in rain/snow. Snow level lowering
to 6500-7500ft MSL Sunday morning. Gusty west-northwest surface
winds Sunday afternoon.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Red Flag Warning until 6 AM MDT Saturday for IDZ400-420-423-
424-426.
OR...Red Flag Warning until 6 AM MDT /5 AM PDT/ Saturday for
ORZ670>674.
&&
www.weather.gov/Boise
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AVIATION.....SH
SHORT TERM...JDS
LONG TERM....LCIn the hours before
Special weather statement, Jun 26, 4:50 PM MST, 2 hours 40 minutes before
Special Weather Statement
National Weather Service Boise ID
450 PM PDT Fri Jun 26 2026
ORZ063-270030-
Malheur County OR-
450 PM PDT Fri Jun 26 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTH CENTRAL MALHEUR COUNTY
THROUGH 530 PM PDT...
At 450 PM PDT, Doppler radar was tracking a strong thunderstorm 7
miles southeast of Jonesboro, or 41 miles west of Parma, moving east
at 25 mph.
HAZARD...Wind gusts up to 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust possible. Minor
damage to outdoor objects is possible.
Locations impacted include...
Harper, Vines Hill, and Little Valley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4391 11745 4391 11743 4372 11739 4370 11786
4381 11788 4393 11745
TIME...MOT...LOC 2350Z 263DEG 22KT 4376 11778
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
JYSpecial weather statement, Jun 26, 5:22 PM MST, 2 hours 8 minutes before
Special Weather Statement
National Weather Service Boise ID
522 PM PDT Fri Jun 26 2026
ORZ063-064-270115-
Oregon Lower Treasure Valley OR-Malheur County OR-
522 PM PDT Fri Jun 26 2026
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL MALHEUR COUNTY
THROUGH 615 PM PDT...
At 522 PM PDT, Doppler radar was tracking a strong thunderstorm near
Freezeout Mountain, or 30 miles west of Parma, moving east at 20 mph.
HAZARD...Wind gusts up to 50 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust reducing
visibility. Minor damage to outdoor objects is possible.
Locations impacted include...
Twin Springs Campground, Shell Rock Butte, Owyhee Dam, and northern
Owyhee Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4366 11763 4380 11757 4377 11707 4352 11722
TIME...MOT...LOC 0022Z 285DEG 18KT 4368 11753
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
JYSpecial weather statement, Jun 26, 5:38 PM MST, 1 hour 52 minutes before
Special Weather Statement
National Weather Service Boise ID
638 PM MDT Fri Jun 26 2026
IDZ012-ORZ064-270130-
Lower Treasure Valley ID-Oregon Lower Treasure Valley OR-
638 PM MDT Fri Jun 26 2026
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN PAYETTE...SOUTHERN
WASHINGTON AND NORTHEASTERN MALHEUR COUNTIES THROUGH 730 PM MDT...
At 638 PM MDT, Doppler radar was tracking a strong thunderstorm near
Keeney Pass, or 7 miles west of Ontario, moving east at 10 mph.
HAZARD...Wind gusts up to 40 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust possible. Minor
damage to outdoor objects is possible.
Locations impacted include...
Ontario, Payette, Fruitland, Vale, and New Plymouth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4392 11720 4402 11723 4422 11687 4397 11670
TIME...MOT...LOC 0038Z 256DEG 7KT 4399 11711
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
JYSpecial weather statement, Jun 26, 6:25 PM MST, 1 hour 5 minutes before
Special Weather Statement
National Weather Service Boise ID
725 PM MDT Fri Jun 26 2026
IDZ012-029-ORZ063-064-270215-
Lower Treasure Valley ID-Owyhee Mountains ID-
Oregon Lower Treasure Valley OR-Malheur County OR-
725 PM MDT Fri Jun 26 2026
...STRONG THUNDERSTORMS WILL IMPACT SOUTH CENTRAL PAYETTE...
NORTHWESTERN CANYON...NORTHWESTERN OWYHEE...SOUTHWESTERN GEM AND EAST
CENTRAL MALHEUR COUNTIES THROUGH 815 PM MDT...
At 725 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from near Owyhee to near Slocum
Creek Campground. Movement was east at 10 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust possible. Minor
damage to outdoor objects is possible.
Locations impacted include...
Parma, Homedale, Wilder, Greenleaf, Notus, Adrian, Board Corral
Mountain, Succor Creek Campground, and Owyhee Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4395 11662 4338 11700 4336 11739 4377 11706
TIME...MOT...LOC 0125Z 264DEG 10KT 4377 11701 4337 11732
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
JYSpecial weather statement, Jun 26, 6:29 PM MST, 1 hour 1 minute before
Special Weather Statement
National Weather Service Boise ID
729 PM MDT Fri Jun 26 2026
IDZ014-015-270215-
Upper Treasure Valley ID-Southwest Highlands ID-
729 PM MDT Fri Jun 26 2026
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL OWYHEE COUNTY THROUGH
815 PM MDT...
At 729 PM MDT, Doppler radar was tracking a strong thunderstorm near
Big Horse Basin Gap, or 37 miles southwest of Mountain Home, moving
northeast at 30 mph.
HAZARD...Wind gusts up to 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust possible. Minor
damage to outdoor objects is possible.
Locations impacted include...
Poison Creek Rec Site, Hinton Reservoir, Chalk Hills, and Big Horse
Basin Gap.
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 4258 11612 4268 11634 4302 11625 4283 11571
TIME...MOT...LOC 0129Z 205DEG 25KT 4270 11615
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
SHSpecial weather statement, Jun 26, 7:08 PM MST, 22 minutes before
Special Weather Statement
National Weather Service Boise ID
808 PM MDT Fri Jun 26 2026
IDZ012-014-270245-
Upper Treasure Valley ID-Lower Treasure Valley ID-
808 PM MDT Fri Jun 26 2026
...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN ADA...SOUTH CENTRAL
PAYETTE...NORTHERN CANYON...NORTHWESTERN OWYHEE AND SOUTHWESTERN GEM
COUNTIES THROUGH 845 PM MDT...
At 804 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from near New Plymouth to near
Homedale. Movement was east at 20 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Areas of blowing dust possible. Minor
damage to outdoor objects is possible.
Locations impacted include...
Nampa, Caldwell, Emmett, Eagle, Star, Middleton, Homedale, Wilder,
Greenleaf, Notus, Sand Hollow, Letha, Huston, Firebird Speedway, and
Lake Lowell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4400 11639 4362 11647 4356 11696 4395 11684
TIME...MOT...LOC 0204Z 261DEG 17KT 4394 11679 4353 11693
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
JY