Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 118, NWS St. Louis, MO

April 28, 20124 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 5:27 PM CDT for 4 counties in Missouri. It was in force for 48 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: Apr 28, 2012, 5:27 PM CDT (22:27 UTC)
Expired: Apr 28, 2012, 6:15 PM CDT
In force: 48 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Crawford County, MO, Jefferson County, MO, Saint Francois County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 63 km from the middle of the area, began a volume at 22:28 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
Apr 28, 6:05 PM CDT	HAIL 1.75	De Soto, MO
Apr 28, 6:11 PM CDT	HAIL 2.5	De Soto, MO	HAIL COVERING GROUND. 55MPH WIND GUSTS MEASURED AS WELL.

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
Apr 28, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 28, 5:15 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.5 hours before the alert went out and 294 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: 1685 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 690 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 368 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.0

Open this sounding in Storm Lab

The text

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

131 
WUUS53 KLSX 282227
SVRLSX
MOC055-099-187-221-282315-
/O.NEW.KLSX.SV.W.0118.120428T2227Z-120428T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
527 PM CDT SAT APR 28 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHWESTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...
  NORTHERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 615 PM CDT

* AT 524 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES EAST OF
  ANTHONIES MILL...AND MOVING EAST AT 35 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

* LOCATIONS IMPACTED INCLUDE...
  DE SOTO...HILLSBORO...RICHWOODS...OLD MINES...LATTY...FLETCHER...
  CADET...BLACKWELL...VALLES MILL AND VICTORIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3818 9113 3821 9097 3820 9078 3824 9077
      3829 9054 3797 9045 3794 9109
TIME...MOT...LOC 2227Z 262DEG 29KT 3808 9094

HAIL...1.00IN
WIND...<50 MPH

$$

KANOFSKY

2 follow-up statements

289 
WWUS53 KLSX 282247
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
547 PM CDT SAT APR 28 2012

MOC055-282257-
/O.CAN.KLSX.SV.W.0118.000000T0000Z-120428T2315Z/
CRAWFORD MO-
547 PM CDT SAT APR 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CRAWFORD COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3795 9095 3820 9097 3820 9078 3824 9077
      3829 9054 3797 9045
TIME...MOT...LOC 2247Z 262DEG 29KT 3810 9074

$$

MOC099-187-221-282315-
/O.CON.KLSX.SV.W.0118.000000T0000Z-120428T2315Z/
JEFFERSON MO-ST. FRANCOIS MO-WASHINGTON MO-
547 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WASHINGTON...NORTHERN ST. FRANCOIS AND SOUTHWESTERN JEFFERSON
COUNTIES UNTIL 615 PM CDT...

AT 545 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 6 MILES NORTH OF
OLD MINES...AND MOVING EAST AT 35 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

LOCATIONS IMPACTED INCLUDE...
DE SOTO...HILLSBORO...FLETCHER...CADET...BLACKWELL...VICTORIA AND
VALLES MILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3795 9095 3820 9097 3820 9078 3824 9077
      3829 9054 3797 9045
TIME...MOT...LOC 2247Z 262DEG 29KT 3810 9074

HAIL...1.00IN
WIND...<50 MPH

$$

KANOFSKY

603 
WWUS53 KLSX 282307
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
607 PM CDT SAT APR 28 2012

MOC099-187-221-282315-
/O.CON.KLSX.SV.W.0118.000000T0000Z-120428T2315Z/
JEFFERSON MO-ST. FRANCOIS MO-WASHINGTON MO-
607 PM CDT SAT APR 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WASHINGTON...NORTHERN ST. FRANCOIS AND SOUTHWESTERN JEFFERSON
COUNTIES UNTIL 615 PM CDT...

AT 603 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DE SOTO...AND
MOVING EAST AT 35 MPH.

HAZARD...GOLF BALL SIZE HAIL.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS.

IN ADDITION...GOLF BALL SIZE HAIL WAS REPORTED IN DE SOTO WITH THIS 
STORM.

LOCATIONS IMPACTED INCLUDE...
VALLES MILL AND VICTORIA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3797 9075 3820 9078 3824 9077 3829 9054
      3797 9045
TIME...MOT...LOC 2307Z 262DEG 29KT 3812 9054

HAIL...1.75IN
WIND...<50 MPH

$$

KANOFSKY

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 1:14 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery	46 min
Apr 28, 1:50 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	40 min
Apr 28, 2:26 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	49 min
Apr 28, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	40 min
Apr 28, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	45 min
Apr 28, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	38 min
Apr 28, 4:49 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	41 min
Apr 28, 4:55 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	50 min
Apr 28, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	41 min
Apr 28, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	40 min
Apr 28, 6:01 PM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	29 min
Apr 28, 6:10 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	34 min
Apr 28, 6:27 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 min

Nearby

Severe Thunderstorm Warnings in Missouri, 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.