Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 113, NWS St. Louis, MO

April 28, 2012Crawford County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 28, 2012, 4:49 PM CDT for Crawford County, Washington County, Missouri. It was in force for 41 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: Apr 28, 2012, 4:49 PM CDT (21:49 UTC)
Expired: Apr 28, 2012, 5:30 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Crawford County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 68 km from the middle of the area, began a volume at 21:52 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
Apr 28, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.8 hours before the alert went out and 295 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.

204 
WUUS53 KLSX 282149
SVRLSX
MOC055-221-282230-
/O.NEW.KLSX.SV.W.0113.120428T2149Z-120428T2230Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 530 PM CDT

* AT 448 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ANTHONIES
  MILL...AND MOVING NORTHEAST AT 25 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

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

* LOCATIONS IMPACTED INCLUDE...
  OLD MINES AND RICHWOODS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3811 9122 3821 9094 3820 9078 3811 9068
      3809 9068 3809 9067 3810 9066 3809 9065
      3809 9066 3808 9064 3803 9064 3794 9114
TIME...MOT...LOC 2149Z 247DEG 23KT 3807 9106

HAIL...1.00IN
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, 4:55 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, 5:27 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Jefferson, Saint Francois, Washington	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.