Alert archive / Kansas / Tornado Warnings in 2011

Tornado Warning 8, NWS Kansas City, MO

May 21, 2011Johnson County, Miami County, Kansas

NWS Kansas City, MO issued this tornado warning at May 21, 2011, 10:54 PM CDT for Johnson County, Miami County, Kansas. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 21, 2011, 10:54 PM CDT (03:54 UTC)
Expired: May 21, 2011, 11:45 PM CDT
In force: 51 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon

Counties Johnson County, KS, Miami County, KS

The radar

The Pleasant Hill radar (KEAX), 64 km from the middle of the area, began a volume at 03:55 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.

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 21, 5:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.9 hours before the alert went out and 231 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: 804 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1618 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

935 
WFUS53 KEAX 220354
TOREAX
KSC091-121-220445-
/O.NEW.KEAX.TO.W.0008.110522T0354Z-110522T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1054 PM CDT SAT MAY 21 2011

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN JOHNSON COUNTY IN EAST CENTRAL KANSAS...
  NORTHWESTERN MIAMI COUNTY IN EAST CENTRAL KANSAS...

* UNTIL 1145 PM CDT

* AT 1050 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR BALDWIN CITY...OR 9 MILES NORTH OF OTTAWA...
  AND MOVING EAST AT 25 MPH.  IN ADDITION TO A TORNADO...PING PONG   
  BALL SIZE HAIL IS EXPECTED WITH THIS STORM. AT 1047 PM CDT         
  SPOTTERS REPORTED A TORNADO NEAR BALDWIN CITY.

* LOCATIONS IMPACTED INCLUDE...
  EDGERTON...GARDNER...SPRING HILL AND CLARE.

THIS WILL IMPACT

 I-35 BETWEEN MILE MARKERS 200 AND 213.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3870 9506 3887 9506 3894 9485 3867 9480
      3865 9507 3869 9507
TIME...MOT...LOC 0353Z 257DEG 21KT 3875 9519
HAIL 1.50IN

$$

CDB

2 follow-up statements

599 
WWUS53 KEAX 220407
SVSEAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1107 PM CDT SAT MAY 21 2011

KSC091-121-220445-
/O.CON.KEAX.TO.W.0008.000000T0000Z-110522T0445Z/
MIAMI KS-JOHNSON KS-
1107 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHWESTERN JOHNSON AND
NORTHWESTERN MIAMI COUNTIES IN EAST CENTRAL KANSAS UNTIL 1145 PM
CDT...

AT 1100 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR WELLSVILLE...OR 6 MILES WEST OF EDGERTON...
MOVING EAST AT 25 MPH.  IN ADDITION TO A TORNADO...PING PONG BALL 
SIZE HAIL IS EXPECTED WITH THIS STORM. WHILE THE CIRCULATION WITH 
THIS STORM HAS WEAKENED THERE ARE INDICATIONS THAT DAMAGING WINDS 
MAY START TO OCCUR NEAR EDGERTON.

LOCATIONS IMPACTED INCLUDE...
  EDGERTON...GARDNER...SPRING HILL AND CLARE.

THIS WILL IMPACT

 I-35 BETWEEN MILE MARKERS 200 AND 214.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 3870 9506 3887 9506 3894 9485 3867 9480
      3865 9507 3869 9507
TIME...MOT...LOC 0405Z 257DEG 21KT 3876 9508
HAIL 1.50IN

$$

CDB

750 
WWUS53 KEAX 220422
SVSEAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1122 PM CDT SAT MAY 21 2011

KSC091-121-220431-
/O.CAN.KEAX.TO.W.0008.000000T0000Z-110522T0445Z/
MIAMI KS-JOHNSON KS-
1122 PM CDT SAT MAY 21 2011

...THE TORNADO WARNING FOR SOUTHWESTERN JOHNSON AND NORTHWESTERN
MIAMI COUNTIES IN EAST CENTRAL KANSAS IS CANCELLED...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN
EFFECT FOR THE AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
JOHNSON COUNTY...NORTHWESTERN MIAMI...NORTHWEST CASS...AND 
SOUTHWESTERN JACKSON UNTIL 1145 PM CDT. 

LAT...LON 3870 9506 3887 9506 3894 9485 3867 9480
      3865 9507 3869 9507
TIME...MOT...LOC 0421Z 257DEG 21KT 3878 9496

$$

MJ

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 7:34 PM CDT	Tornado Warning	EAX	Atchison, Leavenworth	41 min
May 21, 8:01 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	44 min
May 21, 8:08 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	22 min
May 21, 8:12 PM CDT	Tornado Warning	EAX	Leavenworth	33 min
May 21, 8:34 PM CDT	Special Weather Statement	EAX	Doniphan	26 min
May 21, 8:38 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	37 min
May 21, 8:46 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	29 min
May 21, 9:13 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	32 min
May 21, 9:23 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	37 min
May 21, 9:34 PM CDT	Special Weather Statement	EAX	Atchison	26 min
May 21, 9:38 PM CDT	Areal Flood Advisory	EAX	Atchison, Doniphan, Leavenworth	4 hr
May 21, 9:44 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	35 min
May 21, 9:50 PM CDT	Severe Thunderstorm Warning	EAX	Leavenworth	25 min
May 21, 10:11 PM CDT	Severe Thunderstorm Warning	EAX	Atchison, Leavenworth	21 min
May 21, 11:17 PM CDT	Severe Thunderstorm Warning	EAX	Johnson, Miami	28 min
May 21, 11:29 PM CDT	Tornado Warning	EAX	Miami	31 min
May 21, 11:41 PM CDT	Severe Thunderstorm Warning	EAX	Johnson	34 min
May 22, 1:27 AM CDT	River Flood Warning	EAX	Atchison, Leavenworth	32 hr
May 22, 4:04 AM CDT	River Flood Warning	EAX	Atchison	126 days
May 22, 3:23 PM CDT	Special Weather Statement	EAX	Linn	37 min

Nearby

Tornado Warnings in Kansas, 2011 Every tornado warning in 2011 Tornadoes in 2011

Sources

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