Discrete, supercell thunderstorms developed during the late afternoon hours of July 22nd. Hail to the size of 3 inches in diameter was reported across Pottawatomie 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 TOP wrote it up.
Discrete, supercell thunderstorms developed during the late afternoon hours of July 22nd. Hail to the size of 3 inches in diameter was reported across Pottawatomie County. Scattered thunderstorms also developed during the early morning hours of July 26th, producing a damaging wind report in Dickinson 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 Topeka, KS wrote its last area forecast discussion before the first event at Jul 22, 2:00 PM CST, 2 hours 6 minutes earlier.
Area Forecast Discussion National Weather Service Topeka KS 300 PM CDT Sat Jul 22 2017 .SHORT TERM...(This evening through Sunday) Issued at 258 PM CDT Sat Jul 22 2017 This afternoon, a front can be seen bisecting the CWA generally from east to west. This front is not very strong in terms of temperature differences, but moist dewpoints north of the boundary are clear along with a shifting of winds. Heat indicies today have once again risen into the 100-111 degree range today and the Excessive Heat Warning will continue until 8pm this evening. Some hi-res guidance begins to develop storms along the boundary due to convergence and diurnal heating late this afternoon, with the NAM/GFS bringing in precipitation mainly during the evening. With the strong heating, expect any cap to erode and any storms that do develop this afternoon would most likely be unorganized in nature due to the relatively weak effective shear of only 25-30 knots. With a highly unstable atmosphere and soundings indicating a deep, dry adiabatic profile near the surface, strong downburst winds will be the main hazard with any storms this afternoon. Heavy rainfall will be another concern with any storms and localized flooding is a possibility. A mid-level shortwave skims northeast Kansas overnight and more showers and thunderstorms may form in western and central Kansas and move eastward into the area keeping precipitation chances for the entire area until the early morning. By tomorrow morning, the front will be located just south of the area expected to continue south into southern Kansas by the afternoon. Only slight chances for precipitation continue into the afternoon in east central Kansas tomorrow. Even with this frontal passage, we will only see mild reprieve in hot temperatures with highs expected to reach into the into the low and mid 90s. With only light winds and clearing skies, heat indicies Sunday will be in the upper 90s. .LONG TERM...(Sunday night through Saturday) Issued at 258 PM CDT Sat Jul 22 2017 By Sunday night into Monday, a broad mid-level ridge will be stretched out across much of the southern two-thirds of the CONUS, with the CWA wedged between surface high pressure to the northeast and surface low pressure to the northwest. With this surface pattern in place, winds will shift to the southeast and then south Monday into Tuesday, resulting in a moderating trend in temperatures. This southerly flow will also allow for some increased moisture advection into the region through mid-week, so expect a return of hot and humid conditions. Afternoon high temperatures will likely reach into the mid/upper 90s for much of the CWA Monday through Thursday, with dewpoint temperatures rising into the upper 60s/low 70s. With these hot and humid conditions in place, heat index values will likely rise into the 100 to 105 degree range for much of the CWA Tuesday through Thursday, with the highest heat indices expected on Wednesday. As a result, a Heat Advisory may need to be considered for mid-week. With the broad mid-level ridge in place early this week, conditions will stay dry through early AM Tuesday before a couple of very weak embedded waves bring the potential for a few isolated to scattered storms on Tuesday. Models show a mid-level trough skimming across the Dakotas and into the Great Lakes region Tuesday into Wednesday, which ultimately will help push a surface cold front eastward across KS. This boundary looks to extend into north central to far northeast KS on Wednesday before gradually sliding southeastward across the CWA on Thursday. As a result, there is a potential for scattered showers and thunderstorms Wednesday evening into Thursday, with additional post-frontal thunderstorms possible Thursday night through Friday. This frontal passage will provide a bit of relief to the heat with high temperatures Friday and Saturday dropping into the upper 80s to low 90s. With surface high pressure advancing into the region behind the front, expect dry conditions for next weekend. && .AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon) Issued at 1210 PM CDT Sat Jul 22 2017 VFR will prevail through the period, although TS development is expected after 23Z near terminals which could lead to brief restricted conditions depending where storms develop. Have included the best timing for storms over terminals through use of the TEMPO group. Some hi-res guidance have been developing TS activity predominantly south of terminals which is also a possibility. Precipitation is expected to move south of all terminals between 07- 08Z with light and variable winds continuing through the end of the period. && .TOP WATCHES/WARNINGS/ADVISORIES... Excessive Heat Warning until 8 PM CDT this evening for KSZ008>012-020>024-026-034>040-054>056-058-059. && SHORT TERM...Heller LONG TERM...Hennecke AVIATION...Heller
Hazardous Weather Outlook National Weather Service Topeka KS 311 PM CDT Sat Jul 22 2017 KSZ008>012-020>024-026-034>040-054>056-058-059-232015- Republic-Washington-Marshall-Nemaha-Brown-Cloud-Clay-Riley- Pottawatomie-Jackson-Jefferson-Ottawa-Dickinson-Geary-Morris- Wabaunsee-Shawnee-Douglas-Lyon-Osage-Franklin-Coffey-Anderson- 311 PM CDT Sat Jul 22 2017 This hazardous weather outlook is for east central...north central and northeast Kansas. .DAY ONE...This Afternoon and tonight. Heat indices will range from 105 to 113 through the remainder of this afternoon. An Excessive Heat Warning remains in effect until 8 PM CDT. A few strong to severe thunderstorms are possible from mid afternoon through the overnight hours tonight. The primary hazard will be strong wind gusts up to 60 mph. Also, locally heavy rainfall may potentially cause some minor flooding concerns. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight. && More detailed information can be accessed at... http://www.weather.gov/top/sitrep
Special Weather Statement
National Weather Service Topeka KS
453 PM CDT SAT JUL 22 2017
KSZ022-023-222215-
Pottawatomie-Riley-
453 PM CDT SAT JUL 22 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL RILEY AND
NORTHWESTERN POTTAWATOMIE COUNTIES UNTIL 515 PM CDT...
At 451 PM CDT, Doppler radar was tracking a strong thunderstorm 6
miles northeast of Olsburg, moving southwest at 20 mph.
Nickel size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Blaine, Olsburg and Randolph.
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.
If on or near Tuttle Creek Lake, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 3957 9649 3952 9639 3931 9652 3942 9677
3957 9663
TIME...MOT...LOC 2151Z 030DEG 16KT 3951 9655
BDSpecial Weather Statement National Weather Service Topeka KS 502 PM CDT SAT JUL 22 2017 KSZ035-222215- Dickinson- 502 PM CDT SAT JUL 22 2017 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DICKINSON COUNTY UNTIL 515 PM CDT... At 501 PM CDT, Doppler radar was tracking a strong thunderstorm near Moonlight, moving west at 10 mph. Nickel size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Chapman and Moonlight. This includes Interstate 70 between mile markers 281 and 287. LAT...LON 3913 9723 3913 9698 3895 9700 3896 9725 TIME...MOT...LOC 2201Z 094DEG 9KT 3905 9709 BD
The Topeka radar (KTWX), 58 km away, was scanning. The volume nearest the first event began at 22:06 UTC.
6 thunderstorm wind, 3 hail. Local standard time, as filed.
Observer reported 6 to 7 inch diameter tree limbs down on his property. Time was determined by radar.
Report received via social media.
Measured at the Billard Airport ASOS.
Delayed report; extensive damage to several farmsteads. One home lost a portion of its roof and suffered structural damage to its second story. A second home had a tree fall through the living room. Multiple outbuildings were completely destroyed and dozens of trees were heavily damaged or uprooted. Time was estimated from radar.
Wind gust reported at the Concordia Airport ASOS.
Power lines were reported down. Time was estimated from radar.
Report of 2 inch diameter limbs were down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2017Every state in 2017This day in weather historyWarnings in Kansas, 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: 713604, 713605, 713606, 713607, 713608, 713609, 713610, 713611, 713612.