Training thunderstorms produced rainfall amounts exceeding three inches in parts of Frontier County.
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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.
Training thunderstorms produced rainfall amounts exceeding three inches in parts of Frontier County.
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 Jul 17, 5:26 PM CST, 2 hours 20 minutes earlier.
Area Forecast Discussion National Weather Service North Platte NE 626 PM CDT Mon Jul 17 2017 .SHORT TERM...(This evening through Tuesday) Issued at 332 PM CDT Mon Jul 17 2017 Thunderstorm chances to continue tonight, mainly east of a line from Stockville through Arnold and Bartlett. Given high precipitable water vales near 1.5 inches, heavy rainfall will be the primary focus for the far eastern zones. There will also be isolated storms possible further west, from the influence of the upper trough as it moves from central and south central Nebraska into eastern Nebraska overnight. On Tuesday, another hot day. Highs from 90 to 95 north central and 95 to 102 south. A backed east to southeast will maintain dewpoints in the upper 60s to near 70 east, with upper 50s western Sandhills. The combination of heat and humidity will cause heat indices to reach the upper 90s east and southwestern zones. The highest values look to be across Chase, Hayes and Frontier County, reaching 100 to as high as 105. These counties will be in a heat advisory from 18z-01z. Other areas across the southeast will approach 100 degree heat index values. A slight chance for thunderstorms as a weak frontal boundary becomes draped across the central forecast area. A few storms could become strong during the late afternoon hours. .LONG TERM...(Tuesday night through Monday) Issued at 332 PM CDT Mon Jul 17 2017 Thunderstorm chances Tuesday evening from southwest Nebraska into the central and eastern zones. Models suggest the better chance for thunderstorms will be east of Valentine through Broken Bow. A few storms could become strong. Wednesday shaping up to be the hottest day of the week, as the upper ridge intensifies across the Central Plains, and the frontal boundary refocuses near the South Dakota border. Most areas are likely to reach 100 degrees, with southwest Nebraska into the central sandhills reaching as hot as 105. Many areas are likely to reach 100 degrees or high heat indices. A chance for thunderstorms Wednesday night across north central Nebraska, which will be near the stalled frontal boundary and on the northern periphery of the upper ridge. There will chances for thunderstorms over portions of the forecast area each day Thursday through Monday. The main upper ridge will migrate into the Southern Plains and southeastern U.S., and bring monsoonal moisture into the region through at least Saturday. The northern stream will become more active, and bring better chances for thunderstorms late afternoon and overnight each day. Models diverge by Sunday and Monday, as the European model builds the upper ridge back into the Plains. Highs to remain hot on Thursday from the mid to upper 90s north and upper 90s to low 100s south. Still in the 90s Friday, then upper 80s to lower 90s Saturday, and upper 80s by next Sunday and Monday. && .AVIATION...(For the 00Z TAFS through 00Z Tuesday evening) Issued at 626 PM CDT Mon Jul 17 2017 Thunderstorms will be possible in the vicinity of the KLBF and KVTN terminals through 02z this evening. Expect scattered high clouds ranging from 15000 to 20000 FT AGL thereafter. Winds will be gusty from the south and southeast at up to 20 KTS this evening, diminishing after sunset. && .LBF WATCHES/WARNINGS/ADVISORIES... Heat Advisory from 1 PM CDT /noon MDT/ to 8 PM CDT /7 PM MDT/ Tuesday for NEZ069>071. && SHORT TERM...Roberg LONG TERM...Roberg AVIATION...Buttler
Hazardous Weather Outlook National Weather Service North Platte NE 359 PM CDT Mon Jul 17 2017 NEZ004>010-022>029-035>038-056>059-069>071-094-182100- 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- 359 PM CDT Mon Jul 17 2017 /259 PM MDT Mon Jul 17 2017/ This Hazardous Weather Outlook is for portions of western and north central Nebraska. .DAY ONE...TONIGHT. Thunderstorms capable of heavy rainfall are possible this evening, mainly southeast of a line from Stockville to Arnold to Bartlett. Isolated strong to briefly severe thunderstorms capable of hail and strong wind gusts are also possible across the entire outlook area. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. Isolated strong to briefly severe thunderstorms will be possible again Tuesday afternoon and evening, mainly along and north of Interstate 80. A few storms could produce large hail and damaging winds. Heat index values will exceed 100 degrees Tuesday afternoon and early evening across far southwest Nebraska. Heat index values will also likely exceed 100 degrees on Wednesday through Thursday across parts of western Nebraska. While thunderstorm will be possible at times Wednesday and beyond mainly in the afternoon and evening, the risk of severe thunderstorms is low at this time. Thunderstorms will continue to be capable of sparking grass fires from cloud to ground lightning. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight. && Get your weather, hydrological, and climate information at http://www.weather.gov/northplatte Roberg
Special Weather Statement
National Weather Service North Platte NE
258 PM CDT MON JUL 17 2017
NEZ038-172045-
Custer NE-
258 PM CDT MON JUL 17 2017
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LINCOLN AND SOUTHWESTERN
CUSTER COUNTIES UNTIL 345 PM CDT...
At 258 PM CDT, Doppler radar was tracking a strong thunderstorm 12
miles southwest of Callaway, or 28 miles southwest of Broken Bow,
moving north at 30 mph.
Dime size hail and winds in excess of 30 mph will be possible with
this storm.
Locations impacted include...
Callaway, Finchville, Etna, Lodi and Milldale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4105 10024 4141 10023 4134 9976 4105 9992
4104 10020
TIME...MOT...LOC 1958Z 190DEG 26KT 4114 10007
RobergSpecial Weather Statement
National Weather Service North Platte NE
357 PM CDT MON JUL 17 2017
NEZ071-172145-
Frontier NE-
357 PM CDT MON JUL 17 2017
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN FRONTIER COUNTY UNTIL 445
PM CDT...
At 356 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles east of Moorefield, or 15 miles east of Curtis, moving north at
25 mph.
Wind gusts of 50 to 55 mph will be possible with this storm.
Locations impacted include...
Eustis, Stockville, Orafino and Dancing Leaf Earth Lodge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4056 10046 4070 10037 4070 9998 4045 9998
4044 10000 4043 10009 4036 10009 4035 10011
4035 10014
TIME...MOT...LOC 2056Z 192DEG 23KT 4065 10022
JWSThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Law enforcement reported water over Road 408 south of Farnam. The road has been barricaded for the night.
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, July 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: 705468.