Severe thunderstorms occurred in some spots between highways 24 and 36 late in the afternoon on this Thursday. Throughout the morning and early afternoon, a narrow band of light rain, oriented from southwest-northeast, moved from eastern Colorado into western Kansas.
Every event with a place to put it. Tap one for its entry below.
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 GID wrote it up.
Severe thunderstorms occurred in some spots between highways 24 and 36 late in the afternoon on this Thursday. Throughout the morning and early afternoon, a narrow band of light rain, oriented from southwest-northeast, moved from eastern Colorado into western Kansas. Skies were sunny ahead of this rain band and by mid-afternoon, scattered thunderstorms began forming at its leading edge. Around 330 PM CST, these storms began moving into Phillips county, and they were part of a larger line of storms that formed along or ahead of the rain band from Sioux Falls, South Dakota to Garden City, Kansas. This line of storms crossed north central Kansas between 330 and 630 PM CST. After 530 PM CST, enough storms had formed along the common cold pool to result in the formation of a squall line over Jewell and Mitchell counties. Most of the severe weather occurred from a single storm that produced damaging downburst winds over central and northeast Rooks county, and one inch hail in southwest Smith county. That storm occurred prior to the formation of the squall line. Winds were measured as high as 70 MPH at the airport just south of Stockton, and nearby power lines were downed across Highway 183 resulting in its closure for a time. Power lines were also knocked down in the city of Stockton and a tree was blown down near Woodston. Elsewhere, the only other severe weather was a measured wind gust of 60 MPH in Beloit as the squall line moved through the city, but winds between 50 and 55 mph were measured in multiple locations in Mitchell and Jewell counties.
In the preceding days, an east-west oriented front had become quasi-stationary from the Ohio Valley across central Nebraska to Nevada. During the morning hours on this date, a low formed on the front near North Platte, Nebraska. This low then accelerated to near Sioux City, Iowa by mid-afternoon with its trailing cold front becoming mobile and moving southeast. The storms formed along this front. In the upper-levels, a subtropical high was over the Tennessee Valley and gradually moved into the Carolinas as a fairly strong shortwave trough moved out of the Northern Rockies into Northern and Central Plains. Immediately ahead of the front, temperatures were in the lower to middle 90s with dewpoints in the lower to middle 60s. Combined with mid-level lapse rates between 7.0 and 7.5 C/km, SBCAPE was between 1500 and 2000 J/kg. Deep layer shear was near 40 kt.
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 Hastings, NE wrote its last area forecast discussion before the first event at Sep 20, 3:16 PM CST, 56 minutes earlier.
Area Forecast Discussion National Weather Service Hastings NE 416 PM CDT Thu Sep 20 2018 .SHORT TERM...(This evening through Friday) Issued at 248 PM CDT Thu Sep 20 2018 Showers and thunderstorms are beginning to develop along and ahead of a cold front stretched across portions of central Nebraska this afternoon. With around 2000 Joules of CAPE to work with evident on mesoanalysis along with modest shear near the front...expect the area of showers and thunderstorms to continue to fill in and intensify over the next few hours. As this occurs...expect the line of thunderstorms to become more organized and become capable of producing strong winds...along with isolated pockets of marginally severe hail. In addition...until the main upper level wave begins to make a more significant push eastward...could also see some pockets of heavy rainfall as storms will likely train across some of the same areas...which could lead to some isolated rainfall totals of 1 to 2 inches. That said...with the dry conditions of late...do not plan on making an issue of heavy rainfall as it will take a much more significant rainfall event in order to cause much of an issue. Once the main upper level low across Wyoming/Montana shifts further east and pushes the cold front through the local area during the overnight hours tonight...expect a return to more seasonable temperatures...with overnight lows expected to bottom out in the upper 40s in the coolest spots...to mid 50s elsewhere. For tomorrow...despite the mostly sunny skies...expect continued cool air advection behind tonights front to bring a taste of fall...with breezy northwesterly winds and temperatures ranging from only in the 60s across our Nebraska counties...to the lower 70s across portions of north central Kansas. This cool weather will then persist into the evening and overnight hours...when winds drop off and mostly clear skies should combine to make for near ideal radiational cooling conditions...likely making Saturday morning the coolest start to a day we have seen locally since late April. .LONG TERM...(Saturday through Thursday) Issued at 248 PM CDT Thu Sep 20 2018 After a cool start to the day on Saturday...expect weak ridging in the mid to upper levels of the atmosphere to make for a fairly nice weekend across the local area with temperatures rebounding to near seasonal norms under mainly clear skies both Saturday and Sunday afternoons. Could see southerly breezes increase a bit both Sunday and Monday afternoons as the next upper level trough begins transitioning across the intermountain west...which will bring the next chance for some showers and maybe a thunderstorm back to the local area Monday afternoon and evening. Because instability looks very marginal with this system at this point in time...do not anticipate much in the way of strong or severe thunderstorms...with the chance for thunder itself diminishing during the evening and overnight hours Monday as this system makes its way across the local area. Thereafter...a west northwesterly flow pattern is expected to prevail across the local area through the end of next week...bringing multiple...small...chances for showers across the local area along with near seasonal temperatures for late September. && .AVIATION...(For the 18Z KGRI/KEAR TAFS through 18Z Friday) Issued at 1235 PM CDT Thu Sep 20 2018 A cold front will bring MVFR CIGS to both terminals over the next couple of hours as it continues to progress towards the south and east. Ahead of this front, expect gusty southerly to southwesterly winds to continue...with increasing chances for a TSRA by 20/20Z. While there could be IFR CIGS or VSBYS in a +TSRA, opted to keep prevailing conditions at MVFR levels...eventually clearing out behind the front during the late evening through overnight hours. Behind the front...expect mostly clear skies and gusty northwesterly winds across the local area tomorrow. && .GID WATCHES/WARNINGS/ADVISORIES... NE...None. KS...None. && SHORT TERM...Rossi LONG TERM...Rossi AVIATION...Rossi
Hazardous Weather Outlook...CORRECTED National Weather Service Hastings NE 311 PM CDT Thu Sep 20 2018 KSZ005>007-017>019-NEZ039>041-046>049-060>064-072>077-082>087- 212015- Phillips-Smith-Jewell-Rooks-Osborne-Mitchell-Valley-Greeley-Nance- Sherman-Howard-Merrick-Polk-Dawson-Buffalo-Hall-Hamilton-York- Gosper-Phelps-Kearney-Adams-Clay-Fillmore-Furnas-Harlan-Franklin- Webster-Nuckolls-Thayer- 311 PM CDT Thu Sep 20 2018 This Hazardous Weather Outlook is for south central Nebraska and portions of north central Kansas. .DAY ONE...This Afternoon and Tonight. Showers and thunderstorms are expected to develop along and ahead of a cold front this afternoon and track across much of the forecast area during the late afternoon through evening hours. Expect a few of these storms to be on the strong to marginally severe side...especially along and southeast of a line extending from Alma to Silver Creek Nebraska. Hail to the size of quarters and wind gusts to 60 mph will be possible with the strongest storms. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A small chance for thunderstorms returns to much of the forecast area Monday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotter activation is possible this afternoon and evening... especially along and southeast of a line extending from Alma to Silver Creek Nebraska. && More information may be obtained at the following web page: https://www.weather.gov/hastings Rossi
Special Weather Statement
National Weather Service Hastings NE
324 PM CDT THU SEP 20 2018
NEZ049-064-202100-
York NE-Polk NE-
324 PM CDT THU SEP 20 2018
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN YORK AND
SOUTHEASTERN POLK COUNTIES UNTIL 400 PM CDT...
At 324 PM CDT, Doppler radar was tracking a strong thunderstorm over
Benedict, or 11 miles north of York, moving northeast at 45 mph.
Half inch hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Stromsburg, Osceola, Shelby and Benedict.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
east central Nebraska.
LAT...LON 4094 9769 4103 9781 4122 9752 4123 9737
4105 9737
TIME...MOT...LOC 2024Z 236DEG 40KT 4103 9765
ADPSpecial Weather Statement National Weather Service Hastings NE 412 PM CDT THU SEP 20 2018 KSZ005-202145- Phillips KS- 412 PM CDT THU SEP 20 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PHILLIPS COUNTY UNTIL 445 PM CDT... At 412 PM CDT, Doppler radar was tracking a strong thunderstorm near Almena, or 9 miles east of Norton, moving northeast at 40 mph. Penny size hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Prairie View, Long Island and Woodruff. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4000 9962 4000 9930 3983 9940 3976 9963 TIME...MOT...LOC 2112Z 240DEG 33KT 3984 9971 ADP
Special Weather Statement National Weather Service Hastings NE 432 PM CDT THU SEP 20 2018 KSZ017-202215- Rooks KS- 432 PM CDT THU SEP 20 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROOKS COUNTY UNTIL 515 PM CDT... At 432 PM CDT, Doppler radar was tracking a strong thunderstorm over Bogue, or near Hill City, moving northeast at 30 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Stockton, Damar and Webster State Park. LAT...LON 3957 9960 3957 9924 3943 9918 3925 9961 TIME...MOT...LOC 2132Z 224DEG 26KT 3938 9972 Rossi
Special Weather Statement National Weather Service Hastings NE 451 PM CDT THU SEP 20 2018 KSZ005-006-NEZ083-084-202215- Phillips KS-Smith KS-Franklin NE-Harlan NE- 451 PM CDT THU SEP 20 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SMITH...NORTHEASTERN PHILLIPS...SOUTHWESTERN FRANKLIN AND SOUTHEASTERN HARLAN COUNTIES UNTIL 515 PM CDT... At 451 PM CDT, Doppler radar was tracking a strong thunderstorm near Woodruff, or 15 miles north of Phillipsburg, moving northeast at 35 mph. Nickel size hail and wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Alma, Republican City, Naponee, Bloomington, Woodruff and Harlan County Dam. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4031 9913 3992 9883 3984 9935 4000 9948 TIME...MOT...LOC 2151Z 233DEG 29KT 3998 9932 ADP
Special Weather Statement
National Weather Service Hastings NE
457 PM CDT THU SEP 20 2018
NEZ076-202230-
Clay NE-
457 PM CDT THU SEP 20 2018
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CLAY COUNTY UNTIL
530 PM CDT...
At 457 PM CDT, Doppler radar was tracking a strong thunderstorm near
Fairfield, or 22 miles southeast of Hastings, moving northeast at 30
mph.
Nickel size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Sutton, Clay Center, Edgar, Fairfield and Ong.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Nebraska.
LAT...LON 4037 9784 4035 9810 4045 9817 4066 9783
4041 9783
TIME...MOT...LOC 2157Z 236DEG 27KT 4041 9804
ADPPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HASTINGS NE
511 PM CDT THU SEP 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0459 PM TSTM WND GST STOCKTON AIRPORT 39.38N 99.29W
09/20/2018 M70 MPH ROOKS KS AWOS
&&
SRThe Grand Island radar (KUEX), 111 km away, was scanning. The volume nearest the first event began at 22:12 UTC.
2 thunderstorm wind, 1 hail. Local standard time, as filed.
Wind gusts were estimated from a report of downed tree limbs affecting a road north of town as well as the measured gusts from upstream.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2018Every state in 2018This day in weather historyWarnings in Kansas, September 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: 775946, 775948, 775939.