A thunderstorm north of Shoshone created a funnel cloud at around 3:45 PM MDT on September 30th with photographs of the funnel provided by a Twin Falls television meteorologist.
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The episode as NWS PIH wrote it up.
A thunderstorm north of Shoshone created a funnel cloud at around 3:45 PM MDT on September 30th with photographs of the funnel provided by a Twin Falls television meteorologist.
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 Sep 30, 1:20 PM MST, 1 hour 25 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 220 PM MDT Sat Sep 30 2017 .SHORT TERM...Saturday night through Monday. The initial surface front is moving through the Snake River Plain this afternoon, winds have gusted to near 35 mph in the Arco Desert. Expect winds will remain breezy over night then increase slightly on Sunday, but remain below advisory level. Very isolated lightning activity so far between Richfield and Aberdeen, also a couple of cells south of Oakley. Best precipitation the past 6 hours is up to a third of an inch of rain west slopes of the central mountains, mostly less than .10 inch elsewhere. This first round of showers moves through the Eastern Highlands by around midnight. A second disturbance drops south into the Central Mountains and Snake Plain on Sunday. Snow level works lower through the day to around 6000 feet, but still only looking for 1 to 3 inches accumulation in the mountains through Monday morning. Temperature lapse rates steep enough for a few thunderstorms again Sunday afternoon. On Monday, trough develops further into Nevada and Utah in a SW to NE tilted fashion leaving this area in weak forcing with a few showers around but not really significant in terms of rain or snow. Northerly surface winds expected Monday morning should help temperatures in the Snake Plain drop to around freezing. Freeze Watch remains in effect. Should be a little colder on Tuesday morning, would not rule out temperatures cold enough for local hard freeze temperatures, cloud cover could mean a lot. RS .LONG TERM...Tue night through next Saturday. Forecast models beginning to agree on the development of a closed low which is forecast to develop over SE Idaho Tuesday night into Wednesday, which may linger across our area through Thursday. This will provide periods of precipiation along with temperatures near record lows. Under this low, Snow Levels may drop as low as 6000 feet. The combination of low Snow Levels and Snow Showers may create slushy and snow-covered roads for Mountain Passes, and possibly for some valley areas. Exact timing and amounts are still in question, as forecast models have struggled with the evolution of this system. Strong northwest flow forecast to develop across the region for the end of the week into early next weekend should allow Temperatures to remain below Seasonal normals and promote rain and snow shower develop for high terrain areas, northwest-facing slopes in particular. AD/RS && .AVIATION...Cold front has generated some -TSRA in the vicinity of KPIH, otherwise its has been all light rain. Some marginal VFR conditions developed in the wake of the front, but not expected to last with moderate wind helping to break up the lower CIGs. Precipitation will be lighter and more showery than what happened during the mid-day hours, except for KDIJ, which still has to contend with the convection this late afternoon and evening. Skies will partially clear tonight, but more moisture expected Sun afternoon. Main locations affected by this second wave will be KIDA and KDIJ. The last forecast problem is wind for the three valley airdromes. The wind is expected to stay up and elevated through the night, but there are differences amongst guidance on whether the wind will be weaker or stronger on Sun. The guidance that is most correct today is the NAM, which has similar wind as today, with some weakening in the afternoon. Messick && .FIRE WEATHER...A cold front will move through today bringing cooler, wetter and windier conditions. Expect breezy to moderate winds with gust of 30 to 35 mph, particularly today and Sunday, and to a lesser degree Monday and Tuesday. Expect precipitation to start today and continue through next week. Expect around 0.10 of precipitation in valley locations and 0.10 to 0.40 for mountains. Snow levels will start around 9000 feet today before dropping to around 5500 to 6000 feet later Sunday. Expect 1 to 3 inches of snow mainly for the Central Mountains and Eastern Highlands mainly above 7000 feet. Expect isolated thunderstorms this afternoon as well, particularly for the Island Park area, and to a lesser degree Sunday afternoon, which will be mainly for our Eastern areas. Monday through next week will be even cooler with continued precipitation chances. However, precipitation looks to be overall light and mostly in the mountains. Wyatt && .PIH WATCHES/WARNINGS/ADVISORIES... Freeze Watch from late Sunday night through Monday morning for IDZ017-020-021. &&
Special Weather Statement National Weather Service Pocatello ID 203 PM MDT Sat Sep 30 2017 IDZ017>025-031-032-011200- Eastern Magic Valley-Sawtooth Mountains-Upper Snake Highlands- Upper Snake River Plain-Lower Snake River Plain- South Central Highlands-Caribou Highlands- Cache Valley/Idaho Portion-Wasatch Mountains/Idaho Portion- Big and Little Wood River Region-Lost River/Pahsimeroi- Including the cities of Burley, Rupert, Heyburn, Stanley, Clayton, St. Anthony, Ashton, Island Park, Driggs, Victor, Idaho Falls, Rexburg, Pocatello, Malad City, Oakley, Rockland, Henry, Soda Springs, Downey, Lava Hot Springs, Preston, Montpelier, Hailey, Ketchum, Bellevue, Arco, Challis, and Mackay 203 PM MDT Sat Sep 30 2017 ...COLD AND WET WEATHER FOR SOUTHEAST IDAHO CONTINUES THROUGH TUESDAY... A broad low pressure disturbance will remain over Southeastern Idaho into Tuesday. Daytime highs in the 40s and lower 50s are expected. Morning low temperatures at or below freezing both Monday and Tuesday morning will be harmful to freeze sensitive plants. Mountain snow accumulations through Monday morning will be limited to 1 to 3 inches above 6000 feet elevation. Travel may become difficult with snow or ice on Willow Creek Summit northwest of Mackay, Pine Creek Pass on State Highway 31.
Special Weather Statement National Weather Service Pocatello ID 244 PM MDT SAT SEP 30 2017 IDZ021-023-302130- Caribou Highlands ID-Lower Snake River Plain ID- 244 PM MDT SAT SEP 30 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL CARIBOU...NORTHERN BANNOCK...SOUTH CENTRAL BONNEVILLE AND SOUTHEASTERN BINGHAM COUNTIES UNTIL 330 PM MDT... At 243 PM MDT, Doppler radar was tracking a strong thunderstorm 9 miles southeast of Fort Hall Lincoln Creek Lodge or 14 miles northwest of Chesterfield Reservoir, moving east at 25 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Northern Blackfoot Reservoir, Cutthroat Trout Campground and Trail Creek Campground. LAT...LON 4299 11217 4317 11220 4328 11156 4299 11149 TIME...MOT...LOC 2043Z 264DEG 24KT 4309 11209 AD/RS
The Pocatello radar (KSFX), 139 km away, was scanning. The volume nearest the first event began at 21:45 UTC.
1 funnel cloud. Local standard time, as filed.
A thunderstorm north of Shoshone created a funnel cloud at around 3:45 PM MDT on September 30th with photographs of the funnel provided by a Twin Falls television meteorologist.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2017Every state in 2017This day in weather historyWarnings in Idaho, September 2017
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: 721991.