Decaying thunderstorms cause wind damage.
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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 LBF wrote it up.
Decaying thunderstorms cause wind damage.
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 North Platte, NE wrote its last area forecast discussion before the first event at Sep 12, 4:11 PM MST, 5 hours 19 minutes earlier.
Area Forecast Discussion National Weather Service North Platte NE 611 PM CDT Tue Sep 12 2017 .SHORT TERM...(This evening through Wednesday) Issued at 334 PM CDT Tue Sep 12 2017 Latest satellite imagery shows convection developing with the most impressive cloud-top cooling in the far northern Panhandle. The local radar display shows isolated low-end thunderstorms over there, another isolated cell is located south of there near Bayard, NEB. Lightning is predominantly inter- and intra-cloud with very infrequent CG noted. Current thinking is the best chances will be across the northeast Panhandle-northwest NEB-Sandhills. This isolated activity will occur in response to large scale ascent from a disturbance noted in water vapor imagery over eastern WY/western SD/northern Panhandle moving east tonight and modest low-level warm air advection. Chances will then start shifting more towards central NEB in the small hours-early tomorrow morning. Dry and fair conditions are expected tomorrow with well above normal highs by 12-18 degrees -- low to mid 90s. .LONG TERM...(Wednesday night through Tuesday) Issued at 334 PM CDT Tue Sep 12 2017 Most concerns in the long term generally revolve around the Thursday night to Saturday time frame where the pattern is unsettled and there are increased chances for precip. Of which, potential has grown for some isolated strong to severe thunderstorms across portions of north central NEB late Friday afternoon-Friday night. Otherwise, a late cold frontal passage Friday will lead to a cooling trend with highs slightly below normal Saturday and Sunday. Forecast highs for the former and latter span largely the upper 60s to upper 70s, coolest on Saturday. Early Wednesday night the large scale pattern will be characterized by an upper level ridge across Sonora to the Four Corners extending into the Middle Missouri Valley. Elsewhere, upper level closed lows will continue to affect parts of the CONUS – near the central CA coast and over the Ohio Valley. Farther upstream, an amplifying upper level trough will be moving into the Pacific Northwest. The upper level trough will dig southeastward into the Northern Rockies to the western Central Great Basin by Thursday, in the meantime the aforementioned CA closed low will move eastward weakening into an open wave and then phase with the upper level trough. The upper level trough will extend from the Northern High Plains into the Central Great Basin by Friday with a lead shortwave trough moving northeastward within the flow from the Central Rockies into western SD. While increasing chances for precip begins Thursday night (wherein isolated thunderstorms are mentioned), best chances for thunderstorms fall late Friday- Friday night given the current parameter space and model soundings. Current thinking is the best potential lies over north central to northeast NEB where forecast are steep mid-level lapse rates, moderate ML CAPEs, and adequate shear - in the area of an evolving surface low and associated frontal boundary. Some uncertainty with respect to timing and coverage so expect further refinement with later forecast packages. Cooler air will then infiltrate western NEB Friday night into Saturday with largely below seasonal normal highs expected on Saturday. Near to slightly below normal lows and highs are anticipated Saturday night and Sunday, respectively. Precip chances continue across western NEB Saturday-Saturday night. Looking ahead, another unsettled period appears to be Sunday night-Monday with increased chances of precip. Meanwhile, this will coincide with a warming trend with above seasonal normal highs expected again Monday and Tuesday – highs in the lower to mid 80s. && .AVIATION...(For the 00Z TAFS through 00Z Wednesday evening) Issued at 611 PM CDT Tue Sep 12 2017 Showers and thunderstorms are scattered across northwest Cherry county and are epected to move east and reach the KVTN terminal at 00z and remain until 03z. Gusty winds to 25 kts and visibility reduced to 5sm are possible at KVTN. Otherwise VFR conditions expected across the area with KLBF mainly sct250 and light south to southeast winds below 10kt. && .LBF WATCHES/WARNINGS/ADVISORIES... None. && SHORT TERM...ET LONG TERM...ET AVIATION...Roberg
Hazardous Weather Outlook...UPDATED National Weather Service North Platte NE 332 PM CDT Tue Sep 12 2017 NEZ004>010-022>029-035>038-056>059-069>071-094-132045- Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden- Grant-Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson- Logan-Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier- Western Cherry- 332 PM CDT Tue Sep 12 2017 /232 PM MDT Tue Sep 12 2017/ This Hazardous Weather Outlook is for portions of western and north central Nebraska. .DAY ONE...TONIGHT. Isolated thunderstorms are possible late this afternoon through tonight with the best chances across the eastern Panhandle, northwest NEB and the Sandhills. No severe thunderstorms are expected. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. An unsettled weather pattern develops Thursday night through Saturday night. While thunderstorms are possible at times in this period, the best chances for some storms to be strong to severe is Friday afternoon and Friday night across north central Nebraska. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight. && Get your weather, hydrological, and climate information at http://www.weather.gov/northplatte ET
The North Platte radar (KLNX), 113 km away, was scanning. The volume nearest the first event began at 04:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
An empty semi trailer was blown off the road by decaying thunderstorms. Blowing dust was also reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2017Every state in 2017This day in weather historyWarnings in Nebraska, 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: 723185.