Alert archive / Kansas / Tornado Warnings in 2011

Tornado Warning 7, NWS Kansas City, MO

May 21, 2011Leavenworth County, Kansas

NWS Kansas City, MO issued this tornado warning at May 21, 2011, 8:12 PM CDT for Leavenworth County, Kansas. It was in force for 33 min. 2 reports 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 21, 2011, 8:12 PM CDT (01:12 UTC)
Expired: May 21, 2011, 8:45 PM CDT
In force: 33 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon

County Leavenworth County, KS

The radar

The Pleasant Hill radar (KEAX), 84 km from the middle of the area, began a volume at 01:12 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 21, 8:17 PM CDT	HAIL 1	2 W Easton Ks, KS
May 21, 8:33 PM CDT	HAIL 1	5 Nw Leavenworth, KS

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 252 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: 1436 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

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

474 
WFUS53 KEAX 220112
TOREAX
KSC103-220145-
/O.NEW.KEAX.TO.W.0007.110522T0112Z-110522T0145Z/

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

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN LEAVENWORTH COUNTY IN NORTHEAST KANSAS...

* UNTIL 845 PM CDT

* AT 807 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR MCLOUTH...OR 11 MILES NORTHWEST OF
  TONGANOXIE...AND MOVING NORTHEAST AT 25 MPH.  IN ADDITION TO A
  TORNADO...GOLF BALL SIZE HAIL IS EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  LEAVENWORTH...LANSING...EASTON...JARBALO...LOWEMONT AND FORT
  LEAVENWORTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE TORNADO WARNING THAT
WAS IN EFFECT FOR LEAVENWORTH COUNTY.

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 3934 9518 3942 9502 3942 9496 3938 9494
      3939 9491 3937 9489 3936 9489 3935 9491
      3930 9490 3928 9487 3927 9486 3923 9484
      3913 9518
TIME...MOT...LOC 0111Z 238DEG 21KT 3923 9521
HAIL 1.75IN

$$

CDB

2 follow-up statements

835 
WWUS53 KEAX 220122
SVSEAX

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

KSC103-220145-
/O.CON.KEAX.TO.W.0007.000000T0000Z-110522T0145Z/
LEAVENWORTH KS-
822 PM CDT SAT MAY 21 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN LEAVENWORTH
COUNTY UNTIL 845 PM CDT...

AT 817 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 5 MILES NORTHEAST OF MCLOUTH...OR 11 MILES NORTH OF
TONGANOXIE...MOVING NORTHEAST AT 30 MPH.  LOCAL EMERGENCY MANAGEMENT 
WAS REPORTING A LARGE WALL CLOUD WITH THIS STORM. IN ADDITION TO A 
TORNADO...GOLF BALL SIZE HAIL IS EXPECTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  LANSING...LEAVENWORTH...EASTON...LOWEMONT AND FORT LEAVENWORTH.

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 3934 9518 3942 9502 3942 9497 3938 9494
      3939 9491 3937 9489 3936 9489 3935 9491
      3930 9490 3927 9486 3923 9484 3920 9518
TIME...MOT...LOC 0121Z 245DEG 24KT 3927 9513
HAIL 1.75IN

$$

CDB

172 
WWUS53 KEAX 220140
SVSEAX

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

KSC103-220149-
/O.EXP.KEAX.TO.W.0007.000000T0000Z-110522T0145Z/
LEAVENWORTH KS-
840 PM CDT SAT MAY 21 2011

...THE TORNADO WARNING FOR NORTHERN  WILL EXPIRE AT
845 PM CDT...

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

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR
LEAVENWORTH COUNTY UNTIL 915 PM CDT.

LAT...LON 3934 9518 3942 9502 3942 9497 3938 9494
      3939 9491 3937 9489 3936 9489 3935 9491
      3930 9490 3927 9486 3923 9484 3920 9518
TIME...MOT...LOC 0139Z 245DEG 24KT 3932 9499

$$

CDB

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, 8:34 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, 10:54 PM CDT	Tornado Warning	EAX	Johnson, Miami	51 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.