Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 210, NWS St. Louis, MO

July 8, 2012Franklin County, Jefferson County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 8, 2012, 3:41 PM CDT for Franklin County, Jefferson County, Washington County, Missouri. It was in force for 49 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: Jul 8, 2012, 3:41 PM CDT (20:41 UTC)
Expired: Jul 8, 2012, 4:30 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Franklin County, MO, Jefferson County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 46 km from the middle of the area, began a volume at 20:43 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
Jul 8, 4:03 PM CDT	TSTM WND GST 40	2 S Robertsville, MO
Jul 8, 4:22 PM CDT	TSTM WND DMG	Union, MO	NUMEROUS THREE INCH TREE LIMBS DOWN IN UNION.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 283 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: 588 J/kg
Mixed-layer CIN: -359 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

077 
WUUS53 KLSX 082041
SVRLSX
MOC071-099-221-082130-
/O.NEW.KLSX.SV.W.0210.120708T2041Z-120708T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
341 PM CDT SUN JUL 8 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  WEST CENTRAL JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  NORTH CENTRAL WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 430 PM CDT

* AT 338 PM CDT...A CLUSTER OF SEVERE THUNDERSTORMS WAS LOCATED      
  ALONG A LINE EXTENDING FROM ST. CLAIR TO LONEDELL TO 6 MILES       
  SOUTHWEST OF DITTMER TO 5 MILES NORTHEAST OF RICHWOODS...AND       
  MOVING SOUTH AT 5 MPH.

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

  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...
  ST. CLAIR...PARKWAY...LONEDELL...RICHWOODS...DITTMER...FLETCHER AND
  PINEY PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

TORRENTIAL RAINFALL IS OCCURRING WITH THESE STORMS...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

LAT...LON 3848 9111 3842 9086 3834 9066 3821 9067
      3809 9068 3818 9107
TIME...MOT...LOC 2040Z 346DEG 3KT 3836 9100 3833 9083
          3826 9073 3820 9074

HAIL...0.75IN
WIND...60 MPH

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 7:03 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis	42 min
Jul 7, 7:06 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	32 min
Jul 7, 7:10 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Saint Francois, Washington	39 min
Jul 7, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	27 min
Jul 7, 7:58 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	47 min
Jul 7, 8:49 PM CDT	Severe Thunderstorm Warning	LSX	Washington	26 min
Jul 8, 1:36 PM CDT	Severe Thunderstorm Warning	LSX	Osage	39 min
Jul 8, 2:10 PM CDT	Severe Thunderstorm Warning	LSX	Osage	28 min
Jul 8, 3:53 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	37 min
Jul 8, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	19 min
Jul 8, 5:57 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	27 min
Jul 8, 6:49 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	41 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.