Heavy rainfall of more than an inch caused flooding of streets in Pocatello. Garrett Way was closed between N Main Street and W Cedar Street and Marlu Street was closed in front of Lewis and Clark Elementary School and Alameda Middle School.
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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.
Heavy rainfall of more than an inch caused flooding of streets in Pocatello. Garrett Way was closed between N Main Street and W Cedar Street and Marlu Street was closed in front of Lewis and Clark Elementary School and Alameda Middle School.
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 May 18, 12:27 PM MST, 5 hours 33 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 127 PM MDT Fri May 18 2018 .SHORT TERM...Tonight through Monday. A low circulation was noted on satellite imagery over NRN Utah with attending weak showers lifting north through the SE mountains. Further north, a second circulation was noted over CNTRL Washington. Numerical models are showing increased convective - thunderstorm - development this afternoon and evening favoring the mountains with the potential for stronger cells over the SE mountains in proximity to the low circulation over NRN Utah. Have boosted the precipitation potential across that area this evening and also added a slight chance mention of severe thunderstorms. Support weakens rapidly after sunset with the loss of thermal heating. Another round of afternoon and evening thunderstorm activity is expected Saturday and Sunday as the region remains under the influence of a broad upper trough across the NW states. Huston .LONG TERM...Monday night through Friday. The active trend looks as if it will continue through the long term period. The next in the recent series of upper lows will progress through California into the Great Basin and keep southerly flow and moisture streaming into southeast Idaho. Expect showers and thunderstorms each day. European and GFS both indicate a ridge may move into state by Friday but still keeps some moisture in the region For now kept at least a slight chance of precipiation going even at the end of next week. Expect high temperatures near or above seasonal normal for late May. GK && .AVIATION...Showers and thunderstorms or at least in the vicinity are in all TAF sites today as expect fairly widespread coverage in southeast Idaho today. Should perpetuate at least through sunset and have showers continuing through tonight at DIJ. Ceilings should stay VFR except under extremely heavy shower. Expect more showers and thunderstorms Saturday with best chance at DIJ. Winds should be light except for thunderstorm outflow and gust will likely exceed 40 mph near any storms. GK && .HYDROLOGY...We continue to see many rivers and streams running high, fast and cold due to snowmelt and/or locally heavy rain. The only headline we have out is for folks along the Big Wood River around Hailey and Gimlet. Several rivers and streams are running at/just above bankful downstream of reservoirs, and those flows could change quickly if releases need to be cut back or increased. As widely reported in the media, erosion of the Heise- Roberts levee in Jefferson County continues and remains an ongoing concern. Keyes/Huston && .PIH WATCHES/WARNINGS/ADVISORIES...None. &&
Special Weather Statement
National Weather Service Pocatello ID
239 PM MDT FRI MAY 18 2018
IDZ019-182130-
Upper Snake Highlands ID-
239 PM MDT FRI MAY 18 2018
...STRONG THUNDERSTORM SOUTHWEST OF SPENCER MOVING NORTH THROUGH 330
PM MDT...
At 237 PM MDT, Doppler radar was tracking a strong thunderstorm near
Spencer moving slowly north at 5 to 10 mph.
Small hail, brief heavy rain, frequent lightning and wind gusts to
40 mph are possible with this storm as it moves slowly north through
330 PM MDT.
Locations impacted include...
Spencer and Humphrey.
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.
&&
LAT...LON 4452 11209 4425 11219 4426 11244 4447 11245
4447 11244 4445 11242 4446 11241 4445 11239
4446 11237 4449 11236 4453 11235
TIME...MOT...LOC 2037Z 185DEG 6KT 4433 11231
HustonSpecial Weather Statement National Weather Service Pocatello ID 435 PM MDT FRI MAY 18 2018 IDZ023-182315- Caribou Highlands ID- 435 PM MDT FRI MAY 18 2018 ...SPECIAL WEATHER STATEMENT... At 435 PM MDT, Doppler radar was tracking a strong thunderstorm near Chesterfield or 9 miles southeast of Chesterfield Reservoir, moving northwest at 5 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Chesterfield Reservoir, Chesterfield and Bancroft. LAT...LON 4267 11190 4284 11206 4295 11181 4276 11173 TIME...MOT...LOC 2235Z 155DEG 5KT 4278 11187 Hinsberger
Special Weather Statement National Weather Service Pocatello ID 456 PM MDT FRI MAY 18 2018 IDZ021-023-190000- Caribou Highlands ID-Lower Snake River Plain ID- 456 PM MDT FRI MAY 18 2018 ...SPECIAL WEATHER STATEMENT... At 455 PM MDT, Doppler radar was tracking a strong thunderstorm near Inkom or 12 miles east of Pocatello, moving northwest at 5 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Inkom. 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. && LAT...LON 4285 11210 4276 11225 4290 11241 4299 11220 TIME...MOT...LOC 2255Z 142DEG 6KT 4285 11223 Hinsberger
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
508 PM MDT FRI MAY 18 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0503 PM HAIL BANCROFT 42.72N 111.88W
05/18/2018 E0.25 INCH CARIBOU ID PUBLIC
PHOTOS FROM SOCIAL MEDIA SHOW HAIL COVERING
THE GROUND.
&&
NPSpecial Weather Statement National Weather Service Pocatello ID 517 PM MDT FRI MAY 18 2018 IDZ023-190000- Caribou Highlands ID- 517 PM MDT FRI MAY 18 2018 ...SPECIAL WEATHER STATEMENT... At 517 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles north of Lava Hot Springs, moving northwest at 5 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Bancroft. LAT...LON 4273 11186 4267 11194 4272 11214 4285 11198 TIME...MOT...LOC 2317Z 122DEG 5KT 4272 11196 Hinsberger
Special Weather Statement National Weather Service Pocatello ID 626 PM MDT FRI MAY 18 2018 IDZ022-190115- South Central Highlands ID- 626 PM MDT FRI MAY 18 2018 ...SPECIAL WEATHER STATEMENT... At 626 PM MDT, Doppler radar was tracking a strong thunderstorm 12 miles southeast of Rockland or 23 miles south of Neeley, moving southeast at 5 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Roy and Arbon. 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. && LAT...LON 4235 11289 4255 11278 4243 11248 4221 11269 TIME...MOT...LOC 0026Z 304DEG 5KT 4241 11276 Hinsberger
The Pocatello radar (KSFX), 31 km away, was scanning. The volume nearest the first event began at 01:01 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall of more than an inch caused flooding of streets in Pocatello. Garrett Way was closed between N Main Street and W Cedar Street and Marlu Street was closed in front of Lewis and Clark Elementary School and Alameda Middle School.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2018Every state in 2018This day in weather historyWarnings in Idaho, May 2018
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: 760271.