Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 40, NWS St. Louis, MO

March 14, 2012Jefferson County, Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 14, 2012, 7:00 PM CDT for Jefferson County, Missouri; Monroe County, Illinois. It was in force for 45 min. 11 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: Mar 14, 2012, 7:00 PM CDT (00:00 UTC)
Expired: Mar 14, 2012, 7:45 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Monroe County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 54 km from the middle of the area, began a volume at 00:04 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
Mar 14, 7:00 PM CDT	HAIL 0.25	2 W Festus, MO
Mar 14, 7:06 PM CDT	HAIL 0.25	1 N Mapaville, MO
Mar 14, 7:07 PM CDT	HAIL 1	4 W Festus, MO
Mar 14, 7:10 PM CDT	HAIL 0.25	Crystal City, MO
Mar 14, 7:17 PM CDT	HAIL 1	Herculaneum, MO
Mar 14, 7:17 PM CDT	HAIL 1	Pevely, MO
Mar 14, 7:20 PM CDT	HAIL 1	Valmeyer, IL
Mar 14, 7:24 PM CDT	HAIL 1.75	Valmeyer, IL
Mar 14, 7:30 PM CDT	HAIL 0.88	Valmeyer, IL
Mar 14, 7:40 PM CDT	HAIL 0.25	Waterloo, IL
Mar 14, 7:48 PM CDT	HAIL 0.25	Waterloo, IL

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 00:00Z, 0.0 hours before the alert went out and 247 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: 1644 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1773 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

117 
WUUS53 KLSX 150000
SVRLSX
ILC133-MOC099-150045-
/O.NEW.KLSX.SV.W.0040.120315T0000Z-120315T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
700 PM CDT WED MAR 14 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  CENTRAL JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 745 PM CDT

* AT 659 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR FESTUS...AND MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FESTUS...CRYSTAL CITY...HERCULANEUM...PEVELY...BARNHART...
  WATERLOO...COLUMBIA...VALMEYER...FOUNTAIN...NEW DESIGN...
  HARRISONVILLE...CHALFIN BRIDGE...KIMMSWICK...MONROE CITY...
  MAEYSTOWN...MADONNAVILLE...FOSTER POND...WARTBURG...BURKSVILLE AND
  NEW HANDOVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3811 9048 3830 9060 3841 9035 3840 9034
      3839 9034 3844 9029 3848 9020 3843 9015
      3841 9015 3832 9004 3831 9004 3831 9001
TIME...MOT...LOC 0000Z 237DEG 26KT 3824 9044
WIND...HAIL <50MPH 1.00IN

$$

KANOFSKY

1 follow-up statement

445 
WWUS53 KLSX 150026
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
726 PM CDT WED MAR 14 2012

MOC099-150036-
/O.CAN.KLSX.SV.W.0040.000000T0000Z-120315T0045Z/
JEFFERSON MO-
726 PM CDT WED MAR 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL JEFFERSON COUNTY IS
CANCELLED...

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

LAT...LON 3818 9032 3821 9036 3824 9037 3833 9037
      3839 9034 3844 9029 3848 9021 3843 9015
      3841 9015 3832 9004 3831 9004 3831 9001
TIME...MOT...LOC 0026Z 237DEG 26KT 3834 9023

$$

ILC133-150045-
/O.CON.KLSX.SV.W.0040.000000T0000Z-120315T0045Z/
MONROE IL-
726 PM CDT WED MAR 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
MONROE COUNTY UNTIL 745 PM CDT...

AT 724 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
STORM WAS LOCATED NEAR FOUNTAIN...OR 5 MILES WEST OF WATERLOO...
MOVING NORTHEAST AT 30 MPH.

IN ADDITION...AT 724 PM GOLF BALL SIZE HAIL WAS REPORTED IN VALMEYER 
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  WATERLOO...COLUMBIA...NEW DESIGN...BURKSVILLE AND NEW HANDOVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3818 9032 3821 9036 3824 9037 3833 9037
      3839 9034 3844 9029 3848 9021 3843 9015
      3841 9015 3832 9004 3831 9004 3831 9001
TIME...MOT...LOC 0026Z 237DEG 26KT 3834 9023
WIND...HAIL <50MPH 1.75IN

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 15, 1:56 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	49 min
Mar 15, 2:22 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	19 min
Mar 15, 3:11 PM CDT	Flash Flood Warning	LSX	Crawford, Washington	3 hr
Mar 15, 3:19 PM CDT	Severe Thunderstorm Warning	LSX	Washington	26 min
Mar 15, 3:23 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Warren	37 min
Mar 15, 3:27 PM CDT	Severe Thunderstorm Warning	LSX	Gasconade, Osage	48 min
Mar 15, 3:47 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	19 min
Mar 15, 3:48 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Washington	42 min
Mar 15, 3:59 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Warren	46 min
Mar 15, 4:12 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	33 min
Mar 15, 4:26 PM CDT	Flash Flood Warning	LSX	Crawford, Washington	3 hr
Mar 15, 4:46 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	29 min
Mar 15, 4:50 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	40 min
Mar 15, 5:20 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	26 min
Mar 15, 6:16 PM CDT	Flash Flood Warning	LSX	Crawford, Washington	4 hr
Mar 14, 7:41 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	31 min
Mar 15, 5:17 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	43 min
Mar 15, 5:52 PM CDT	Severe Thunderstorm Warning	LSX	Greene	38 min
Mar 15, 6:16 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	44 min
Mar 15, 6:50 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Pike	29 min
Mar 15, 6:58 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	15 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2012 Severe Thunderstorm Warnings in Illinois, 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.