On June 25th video of debris flow running over north bound interstate 15 just north of the Utah border in Oneida county was seen. Radar estimated 2 inches of rainfall in that area resulting in the debris flow and 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 PIH wrote it up.
On June 25th video of debris flow running over north bound interstate 15 just north of the Utah border in Oneida county was seen. Radar estimated 2 inches of rainfall in that area resulting in the debris flow and 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 Pocatello, ID wrote its last area forecast discussion before the first event at Jun 25, 2:09 AM MST, 10 hours 21 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 309 AM MDT Fri Jun 25 2021 .SHORT TERM...Today through Sunday. Another day of showers and thunderstorms in on tap for eastern Idaho. The risk of lightning and gusty winds has been fickle the past couple of days based on cloud cover. There will be lingering showers across the southeast corner this morning, but it looks like cloud cover won't be as thick...which lends itself to warming up quicker and having enough instability there this afternoon. The rest of the area will see showers and storms starting to form just before noon, and increasing during the afternoon and dropping south-southeast. We should see isolated thunderstorms in most area, EXCEPT along the Wyoming border and portions of the southeast highlands and the mountains/highlands adjacent to the Snake Plain. It appears there is a better chance of rain producers tomorrow in that area, although with decent moisture lingering elsewhere...brief bursts of rain are possible anywhere we get something to fire this afternoon. We are also expecting wind gusts over 35 mph with some of these storms. Storms will quickly decrease after sunset with drier conditions quickly moving in for the weekend. There appears to be just enough moisture around Bear Lake a storm or two Saturday. With the strong ridge developing to our northwest, pretty breezy north to northeast winds will develop. While we may not see WIND ADVISORY thresholds met, it definitely looks like we will see LAKE WIND ADVISORY conditions met for American Falls Reservoir tomorrow and likely again Sunday. Starting Sunday, let the heatwave begin. Keyes .LONG TERM...Monday through next Friday. Expect a long-duration heat event for East Idaho. This event will likely be the longest extreme hot period in history for southeast Idaho. High pressure will build into the area starting Saturday and last all next week. Very hot temperatures are in store through Friday, especially Tuesday, Wednesday, and Thursday, where record temperatures are expected. We could break all-time temperature records for several locations Wednesday, and, possibly, Thursday. An Excessive Heat watch is out starting Monday. Will likely have a Excessive Heat warnings out all next week. Models are slow to move out the high pressure. Extreme heat will likely continue through next weekend into July 4th. The GFS and ECMWF modes are showing moisture, supporting dry thunderstorms starting Wednesday and continuing through Friday. If this occurs, it could drop the temperatures a few degrees over the current forecast. Wyatt && .AVIATION...Moisture and instability will bring isolated thunderstorms again this afternoon. Models are showing the best chance of thunderstorms for our eastern areas with KDIJ having the best chance for thunderstorms on station. However, have vicinity thunderstorms for all TAF locations this afternoon. Strong thunderstorm outflow winds of around 40 mph will be the biggest impact. Some outflows in the Snake Plain will likely be higher. Today should be the last day of thunderstorms in the area. Saturday high pressure bringing dry and much warmer conditions will move into the area. Wyatt && .FIRE WEATHER...Admittedly, thunderstorms and verifying our Red Flag Warnings have been pretty fickle so far this week. Where the models have been indicating higher lightning potential, lingering extensive cloud cover has been an issue sneaking into the picture...keeping storms at bay most of the time. One more day of showers and storms is with us before we dry and out and will be dealing with our advertised prolonged heat event begins. A few showers (and maybe a thunderstorm) will persist this morning across the southeast corner. By late morning, showers and storms will being to pop and increase during the afternoon hours. Storms will be dropping south-southeast and also be a mix of wet and dry storms...and actually leaning more wet than dry. Getting to the Red Flag situation. It looks like we should have less cloud cover, even across the southeast corner where we have clouds early on. It is this area where the models are basically saying here will be a 40+ percent chance of lightning. That is the highest we've seen with this event. We feel we cannot ignore this potential today despite some of our concerns and what's happened the past couple of days, and will issue a RED FLAG WARNING for Zone 413. Storms will quickly diminish this evening. This will signal the beginning of our advertised multi-day extreme heat event across central and eastern Idaho. Temperatures will begin with a slow climb over the weekend, as the flow will be northeasterly with the low still the northwest. Breezy north to northeast winds will persist tomorrow and Sunday. The worst of the heat begins Monday and will likely continue through the 4th of July. Drier surface air under the ridge will produce low humidity, including poor recovery at mid slopes later on next week. The models are still hinting that MAYBE we see a little bit moisture somehow make it under the ridge and pop off a few showers and storms later next week. At the moment, it is hard to say if that is reality, or the models way overplaying any amount of moisture due to the extreme heat and nothing will happen. Even so, that will not the diminish the compounding impacts from this heatwave. Keyes && .PIH WATCHES/WARNINGS/ADVISORIES... Excessive Heat Watch from Monday afternoon through Thursday evening for IDZ051-055. Excessive Heat Watch from Tuesday afternoon through Thursday evening for IDZ052>054-056>059-068>075. Red Flag Warning from noon today to 9 PM MDT this evening for IDZ413. &&
Special Weather Statement
National Weather Service Pocatello ID
1204 PM MDT Fri Jun 25 2021
IDZ060-061-063-251900-
Bear Lake Valley ID-Bear River Range ID-Caribou Range ID-
1204 PM MDT Fri Jun 25 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FRANKLIN AND
SOUTHWESTERN BEAR LAKE COUNTIES INCLUDING BEAR LAKE UNTIL 100 PM
MDT...
At 1200 PM MDT, Doppler radar was tracking a thunderstorm 8 miles
southwest of Georgetown, or 9 miles northwest of Montpelier, moving
southeast at 5 mph.
Winds in excess of 40 mph and cloud to ground lightning will be
possible with this storm.
Boaters can expect a sudden increase in waves and very choppy waters
which will result in hazardous boating conditions. Boaters are urged
to seek safe harbor if possible.
LAT...LON 4200 11143 4200 11146 4240 11161 4248 11139
4213 11104 4210 11105
TIME...MOT...LOC 1800Z 333DEG 5KT 4238 11146
McKaughanThe national radar mosaic for the moment the first event began.
1 debris flow. Local standard time, as filed.
On June 25th video of debris flow running over north bound interstate 15 just north of the Utah border in Oneida county was seen. Radar estimated 2 inches of rainfall in that area resulting in the debris flow and flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2021Every state in 2021This day in weather historyWarnings in Idaho, June 2021
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: 965371.