Alert archive / Kansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 121, NWS Topeka, KS

August 10, 2021Pottawatomie County, Riley County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Aug 10, 2021, 5:11 AM CDT for Pottawatomie County, Riley County, Kansas. It was in force for 22 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 10, 2021, 5:11 AM CDT (10:11 UTC)
Expired: Aug 10, 2021, 5:33 AM CDT
In force: 22 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Pottawatomie County, KS, Riley County, KS

The radar

The Topeka radar (KTWX), 38 km from the middle of the area, began a volume at 10:14 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 10, 5:34 AM CDT	HAIL 1	Saint George, KS

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 10.2 hours before the alert went out and 86 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3834 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1380 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted.

182 
WUUS53 KTOP 101011
SVRTOP
KSC149-161-101045-
/O.NEW.KTOP.SV.W.0121.210810T1011Z-210810T1045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Topeka KS
511 AM CDT Tue Aug 10 2021

The National Weather Service in Topeka has issued a

* Severe Thunderstorm Warning for...
  Southeastern Riley County in northeastern Kansas...
  Southwestern Pottawatomie County in northeastern Kansas...

* Until 545 AM CDT.

* At 511 AM CDT, a severe thunderstorm was located near Keats, moving
  east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Manhattan, St. George and Keats. 

This includes Interstate 70 near mile marker 320.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3914 9674 3929 9672 3929 9641 3906 9641
TIME...MOT...LOC 1011Z 285DEG 31KT 3919 9665 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gargan

4 follow-up statements

960 
WWUS53 KTOP 101018
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
518 AM CDT Tue Aug 10 2021

KSC149-161-101045-
/O.CON.KTOP.SV.W.0121.000000T0000Z-210810T1045Z/
Riley-Pottawatomie-
518 AM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR SOUTHEASTERN RILEY AND SOUTHWESTERN POTTAWATOMIE COUNTIES...

At 517 AM CDT, a severe thunderstorm was located over Manhattan, 
moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Manhattan, St. George and Keats. 

This includes Interstate 70 near mile marker 320.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3914 9674 3929 9672 3929 9641 3906 9641
TIME...MOT...LOC 1017Z 285DEG 31KT 3918 9658 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gargan

542 
WWUS53 KTOP 101022
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
522 AM CDT Tue Aug 10 2021

KSC149-161-101045-
/O.CON.KTOP.SV.W.0121.000000T0000Z-210810T1045Z/
Riley-Pottawatomie-
522 AM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR SOUTHEASTERN RILEY AND SOUTHWESTERN POTTAWATOMIE COUNTIES...

At 522 AM CDT, a severe thunderstorm was located near Manhattan,
moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Manhattan and St. George. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3920 9668 3929 9669 3929 9641 3906 9641
      3912 9661
TIME...MOT...LOC 1022Z 273DEG 29KT 3919 9652 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gargan

171 
WWUS53 KTOP 101027
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
527 AM CDT Tue Aug 10 2021

KSC149-161-101045-
/O.CON.KTOP.SV.W.0121.000000T0000Z-210810T1045Z/
Riley-Pottawatomie-
527 AM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM CDT
FOR SOUTHEASTERN RILEY AND SOUTHWESTERN POTTAWATOMIE COUNTIES...

At 526 AM CDT, a severe thunderstorm was located near St. George,
moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Manhattan and St. George. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3921 9665 3929 9666 3929 9641 3911 9641
      3915 9656
TIME...MOT...LOC 1026Z 273DEG 29KT 3918 9647 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gargan

505 
WWUS53 KTOP 101033
SVSTOP

Severe Weather Statement
National Weather Service Topeka KS
533 AM CDT Tue Aug 10 2021

KSC149-161-101042-
/O.CAN.KTOP.SV.W.0121.000000T0000Z-210810T1045Z/
Riley-Pottawatomie-
533 AM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN RILEY AND
SOUTHWESTERN POTTAWATOMIE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3921 9665 3929 9666 3929 9641 3911 9641
      3915 9656
TIME...MOT...LOC 1032Z 285DEG 31KT 3916 9640 

$$

Gargan

The office that day

Everything else NWS Topeka, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 3:13 AM CDT	Special Weather Statement	TOP	Cloud	32 min
Aug 10, 3:24 AM CDT	Severe Thunderstorm Warning	TOP	Cloud	36 min
Aug 10, 3:30 AM CDT	Special Weather Statement	TOP	Ottawa	30 min
Aug 10, 4:01 AM CDT	Special Weather Statement	TOP	Cloud, Ottawa	29 min
Aug 10, 4:26 AM CDT	Special Weather Statement	TOP	Clay, Dickinson	34 min
Aug 10, 4:57 AM CDT	Special Weather Statement	TOP	Clay, Dickinson, Geary, Riley	33 min
Aug 10, 5:35 AM CDT	Special Weather Statement	TOP	Wabaunsee	25 min
Aug 10, 6:12 AM CDT	Special Weather Statement	TOP	Shawnee	33 min
Aug 10, 6:53 AM CDT	Special Weather Statement	TOP	Douglas	37 min
Aug 10, 7:43 AM CDT	Special Weather Statement	TOP	Franklin	32 min
Aug 10, 4:40 PM CDT	Special Weather Statement	TOP	Lyon	35 min
Aug 10, 4:56 PM CDT	Severe Thunderstorm Warning	TOP	Lyon	49 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.