A persistent upper low continued to produce showers and thunderstorms across the area including a tornado in the Treasure Valley.
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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 persistent upper low continued to produce showers and thunderstorms across the area including a tornado in the Treasure Valley.
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 May 27, 1:03 PM MST, 1 hour 37 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 203 PM MDT Mon May 27 2019 .SHORT TERM...Tonight through Thursday...Convection will continue through the period, with showers and afternoon-evening thunderstorms each day. An upper low will support most of the convection in southwest Idaho through this evening. The low will move east of our area as another low off the PacNW coast develops and moves into the northwest U.S. Wednesday through Thursday. The storms will be capable of producing small hail, gusty winds, and heavy rain. Temperatures will be near normal. .LONG TERM...Thursday night through Monday...An active pattern remains for the first part of the period as the area sits under a split upper level flow. Ridging to our north and trough to our south will dominate through the start of next week. Afternoon showers and thunderstorms can be expected during this time. Starting Monday, a drier zonal flow pushes into the area. Temperatures sit close to normal for this time of year. && .AVIATION...Showers will increase throughout the rest of the afternoon becoming widespread later in the day. Scattered thunderstorms are expected with some capable of heavy rainfall, strong gusts, and small hail. Surface winds, northwest 5-10kts with gusts 25-35kts. Winds aloft to 10k feet MSL, north 25-30kts. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise SHORT TERM...BW LONG TERM....JC/JC AVIATION.....JC
Special Weather Statement National Weather Service Boise ID 153 PM MDT Mon May 27 2019 IDZ013-028-272045- Boise Mountains ID-Camas Prairie ID- 153 PM MDT Mon May 27 2019 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL ELMORE AND WEST CENTRAL CAMAS COUNTIES UNTIL 245 PM MDT... At 153 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles northwest of Corral, or 16 miles west of Fairfield, moving west at 10 mph. Pea size hail and wind gusts of 50 to 55 mph will be possible with this storm. This strong thunderstorm will be near... Pine, Anderson Ranch Reservoir and Cat Creek Summit around 240 PM MDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. When safe to do so, please relay storm reports to the National Weather Service in Boise via local law enforcement, or National Weather Service Boise Facebook and Twitter accounts. && LAT...LON 4354 11505 4337 11496 4323 11528 4349 11544 TIME...MOT...LOC 1953Z 069DEG 7KT 4344 11511 JC
The Boise radar (KCBX), 78 km away, was scanning. The volume nearest the first event began at 21:37 UTC.
1 tornado. Local standard time, as filed.
A photo of a tornado was posted on social media . The location is based on an interview with the spotter and the associated radar couplet.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2019Every state in 2019This day in weather historyThe tornado archive for Idaho, 2019Warnings in Idaho, May 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: 819456.