Alert archive / Kansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 45, NWS Kansas City, MO

May 6, 2012Johnson County, Kansas

NWS Kansas City, MO issued this severe thunderstorm warning at May 6, 2012, 6:42 PM CDT for Johnson County, Kansas. It was in force for 19 min. 3 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 6, 2012, 6:42 PM CDT (23:42 UTC)
Expired: May 6, 2012, 7:01 PM CDT
In force: 19 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Johnson County, KS

The radar

The Pleasant Hill radar (KEAX), 47 km from the middle of the area, began a volume at 23:43 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 6, 6:53 PM CDT	HAIL 0.75	Olathe, KS	REPORTED AT THE INTERSECTION OF INTERSTATE 435 AND INTERSTATE 35.
May 6, 7:02 PM CDT	HAIL 0.75	Olathe, KS	REPORTED AT 115TH AND PFLUMM.
May 6, 7:02 PM CDT	HAIL 1	2 W Olathe, 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 6, 3:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 11.7 hours before the alert went out and 74 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: 1880 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 286 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

625 
WUUS53 KEAX 062342
SVREAX
KSC091-070015-
/O.NEW.KEAX.SV.W.0045.120506T2342Z-120507T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
642 PM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN PLEASANT HILL HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL JOHNSON COUNTY IN EAST CENTRAL KANSAS...

* UNTIL 715 PM CDT

* AT 639 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR OLATHE...AND
  MOVING EAST AT 5 MPH.

  HAZARD...HALF DOLLAR SIZE HAIL AND 60 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
           DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

* LOCATIONS IMPACTED INCLUDE...
  OLATHE AND LACKMANS.

THIS WILL IMPACT

 I-35 BETWEEN MILE MARKERS 213 AND 220.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS IN AN
INTERIOR ROOM...A BATHROOM OR CLOSET...OR BASEMENT.

&&

LAT...LON 3894 9476 3882 9474 3883 9487 3888 9488
TIME...MOT...LOC 2342Z 252DEG 5KT 3886 9482

HAIL...1.25IN
WIND...60 MPH

$$

DEROCHE

2 follow-up statements

312 
WWUS53 KEAX 062357
SVSEAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
657 PM CDT SUN MAY 6 2012

KSC091-070015-
/O.CON.KEAX.SV.W.0045.000000T0000Z-120507T0015Z/
JOHNSON KS-
657 PM CDT SUN MAY 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL 
JOHNSON COUNTY IN EAST CENTRAL KANSAS UNTIL 715 PM CDT...

AT 652 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR OLATHE...AND
MOVING EAST AT 5 MPH.

HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
         DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.

AT 636 PM...TRAINED WEATHER SPOTTERS REPORTED QUARTER SIZE HAIL IN 
OLATHE

LOCATIONS IMPACTED INCLUDE...
LACKMANS.

THIS WILL IMPACT

 I-35 BETWEEN MILE MARKERS 217 AND 221.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMAIN ALERT FOR A POSSIBLE TORNADO! TORNADOES CAN DEVELOP QUICKLY
FROM SEVERE THUNDERSTORMS. IF YOU SPOT A TORNADO GO AT ONCE INTO THE
BASEMENT OR SMALL CENTRAL ROOM IN A STURDY STRUCTURE.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS IN AN
INTERIOR ROOM...A BATHROOM OR CLOSET...OR BASEMENT.

&&

LAT...LON 3887 9483 3890 9484 3894 9476 3886 9475
TIME...MOT...LOC 2357Z 252DEG 5KT 3887 9479

HAIL...1.00IN
WIND...60 MPH

$$

DEROCHE

936 
WWUS53 KEAX 070001
SVSEAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
701 PM CDT SUN MAY 6 2012

KSC091-070011-
/O.CAN.KEAX.SV.W.0045.000000T0000Z-120507T0015Z/
JOHNSON KS-
701 PM CDT SUN MAY 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL JOHNSON COUNTY IN EAST
CENTRAL KANSAS IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 11PM.

LAT...LON 3887 9483 3890 9484 3894 9476 3886 9475
TIME...MOT...LOC 0001Z 252DEG 5KT 3887 9478

$$

DEROCHE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 11:02 AM CDT	Areal Flood Advisory	EAX	Johnson, Wyandotte	5 hr
May 6, 4:25 PM CDT	Special Weather Statement	EAX	Johnson	35 min
May 6, 4:30 PM CDT	Severe Thunderstorm Warning	EAX	Johnson	30 min
May 6, 5:59 PM CDT	Special Weather Statement	EAX	Johnson	46 min
May 6, 6:05 PM CDT	Severe Thunderstorm Warning	EAX	Johnson	25 min
May 6, 6:10 PM CDT	Tornado Warning	EAX	Johnson	35 min
May 6, 6:48 PM CDT	Areal Flood Advisory	EAX	Johnson, Leavenworth, Wyandotte	2 hr
May 6, 6:53 PM CDT	Severe Thunderstorm Warning	EAX	Johnson	37 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2012 Every severe thunderstorm warning in 2012

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.