Alert archive / Kansas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 11, NWS Kansas City, MO
NWS Kansas City, MO issued this severe thunderstorm warning at May 8, 2021, 11:19 PM CDT for Atchison County, Leavenworth County, Wyandotte County, Kansas; Buchanan County, Platte County, Missouri. It was in force for 41 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
- May 8, 2021, 11:19 PM CDT (04:19 UTC)
- Expired
- May 9, 2021, 12:00 AM CDT
- In force
- 41 min
- Issued by
- NWS Kansas City, MO
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 70.0 mph
Counties Atchison County, KS, Leavenworth County, KS, Wyandotte County, KS, Buchanan County, MO, Platte County, MO
The radar
The Pleasant Hill radar (KEAX), 81 km from the middle of the area, began a volume at 04:21 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 |
|---|---|---|---|
| May 8, 11:35 PM CDT | TSTM WND DMG | 1 Ese Weston, MO | TREE FELL ON HOUSE REQUIRING RESPONSE FROM LOCAL FIRE DEPARTMENT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 8, 6:42 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 8, 9:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Topeka, KS (KTOP), launched 00:00Z, 4.3 hours before the alert went out and 62 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.
- Mixed-layer CAPE
- 377 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 1653 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 362 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.0
The text
As transmitted.
478
WUUS53 KEAX 090419
SVREAX
KSC005-103-209-MOC021-165-090500-
/O.NEW.KEAX.SV.W.0011.210509T0419Z-210509T0500Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
1119 PM CDT Sat May 8 2021
The National Weather Service in Pleasant Hill has issued a
* Severe Thunderstorm Warning for...
Wyandotte County in northeastern Kansas...
Leavenworth County in northeastern Kansas...
Southeastern Atchison County in northeastern Kansas...
Southern Buchanan County in northwestern Missouri...
Platte County in west central Missouri...
* Until midnight CDT.
* At 1118 PM CDT, a severe thunderstorm was located over Winchester,
or 7 miles northeast of Oskaloosa, moving east at 55 mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Leavenworth, Lansing, Atchison, Mission, Bonner Springs, Parkville,
Tonganoxie, Platte City, Basehor, Edwardsville, Riverside,
Weatherby Lake, Weston, Gower, Westwood, Lake Quivira, Kansas City
Kansas, Kansas City, Lake Waukomis and Edgerton.
This includes the following highways...
Interstate 70 in Missouri near mile marker 0.
Interstate 70 in Kansas between mile markers 410 and 423.
Interstate 35 in Kansas between mile markers 231 and 234.
Interstate 29 between mile markers 4 and 36.
Interstate 635 between mile markers 1 and 12.
Interstate 435 between mile markers 9 and 39.
Kansas Turnpike between mile markers 213 and 226.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3954 9535 3963 9460 3904 9461 3905 9481
3906 9484 3906 9487 3905 9488 3905 9518
3942 9518 3942 9537
TIME...MOT...LOC 0418Z 268DEG 46KT 3931 9526
HAIL...0.88IN
WIND...70MPH
$$
Blair2 follow-up statements
391
WWUS53 KEAX 090435
SVSEAX
Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1135 PM CDT Sat May 8 2021
KSC005-103-209-MOC021-165-090500-
/O.CON.KEAX.SV.W.0011.000000T0000Z-210509T0500Z/
Wyandotte KS-Leavenworth KS-Atchison KS-Buchanan MO-Platte MO-
1135 PM CDT Sat May 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR WYANDOTTE...LEAVENWORTH...SOUTHEASTERN ATCHISON...SOUTHERN
BUCHANAN AND PLATTE COUNTIES...
At 1135 PM CDT, a severe thunderstorm was located over Leavenworth,
moving east at 55 mph.
HAZARD...70 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Leavenworth, Lansing, Atchison, Mission, Bonner Springs, Parkville,
Tonganoxie, Platte City, Basehor, Edwardsville, Riverside, Weatherby
Lake, Weston, Gower, Westwood, Lake Quivira, Kansas City Kansas,
Kansas City, Lake Waukomis and Edgerton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3956 9517 3963 9460 3904 9461 3905 9481
3906 9484 3906 9487 3905 9488 3905 9518
3942 9518
TIME...MOT...LOC 0435Z 267DEG 47KT 3932 9495
HAIL...0.88IN
WIND...70MPH
$$
Blair453
WWUS53 KEAX 090447
SVSEAX
Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
1147 PM CDT Sat May 8 2021
KSC005-090456-
/O.CAN.KEAX.SV.W.0011.000000T0000Z-210509T0500Z/
Atchison KS-
1147 PM CDT Sat May 8 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ATCHISON COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
northeastern and east central Kansas...and northwestern and west
central Missouri.
LAT...LON 3959 9491 3963 9460 3904 9461 3905 9481
3906 9484 3906 9487 3905 9488 3905 9518
3929 9518 3942 9497
TIME...MOT...LOC 0446Z 268DEG 46KT 3933 9475
$$
KSC103-209-MOC021-165-090500-
/O.CON.KEAX.SV.W.0011.000000T0000Z-210509T0500Z/
Wyandotte KS-Leavenworth KS-Buchanan MO-Platte MO-
1147 PM CDT Sat May 8 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR WYANDOTTE...LEAVENWORTH...SOUTHEASTERN BUCHANAN AND PLATTE
COUNTIES...
At 1146 PM CDT, a severe thunderstorm was located over Platte City,
moving east at 55 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Leavenworth, Lansing, Mission, Bonner Springs, Parkville, Tonganoxie,
Platte City, Basehor, Edwardsville, Riverside, Weatherby Lake,
Weston, Gower, Westwood, Lake Quivira, Kansas City Kansas, Kansas
City, Lake Waukomis, Edgerton and Dearborn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3959 9491 3963 9460 3904 9461 3905 9481
3906 9484 3906 9487 3905 9488 3905 9518
3929 9518 3942 9497
TIME...MOT...LOC 0446Z 268DEG 46KT 3933 9475
HAIL...0.88IN
WIND...60MPH
$$
BlairThe office that day
Everything else NWS Kansas City, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 5:09 AM CDT | Special Weather Statement | EAX | Johnson, Leavenworth, Wyandotte | 51 min |
| May 8, 11:55 PM CDT | Severe Thunderstorm Warning | EAX | Caldwell, Clay, Clinton, Jackson, Ray | 35 min |
| May 9, 12:29 AM CDT | Special Weather Statement | EAX | Carroll, Lafayette, Ray | 31 min |
| May 9, 1:00 AM CDT | Special Weather Statement | EAX | Cass, Johnson | 45 min |
| May 9, 1:27 AM CDT | Severe Thunderstorm Warning | EAX | Cass, Henry, Johnson | 33 min |
| May 9, 1:37 AM CDT | Special Weather Statement | EAX | Johnson, Pettis | 38 min |
| May 9, 1:43 AM CDT | Special Weather Statement | EAX | Cooper, Howard, Randolph, Saline | 47 min |
| May 9, 2:11 AM CDT | Special Weather Statement | EAX | Pettis | 34 min |
| May 9, 1:25 PM CDT | River Flood Warning | EAX | Johnson, Pettis | 10 hr |
| May 9, 1:25 PM CDT | River Flood Warning | EAX | Cooper, Saline | 25 hr |
Nearby
Severe Thunderstorm Warnings in Kansas, 2021Severe Thunderstorm Warnings in Missouri, 2021Every 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.