Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 50, NWS St. Louis, MO

March 15, 2012Saint Charles County, Saint Louis County, Missouri; Jersey County, Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 15, 2012, 4:12 PM CDT for Saint Charles County, Saint Louis County, Missouri; Jersey County, Madison County, Illinois. It was in force for 33 min. 6 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 15, 2012, 4:12 PM CDT (21:12 UTC)
Expired
Mar 15, 2012, 4:45 PM CDT
In force
33 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Jersey County, IL, Madison County, IL, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 21:14 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

TimeReportWhereRemark
Mar 15, 4:13 PM CDTHAIL 1St. Ann, MOHAIL REPORTED JUST NORTH AND WEST OF LAMBERT AIRPORT.
Mar 15, 4:15 PM CDTHAIL 0.5St. John, MO
Mar 15, 4:18 PM CDTHAIL 1Hazelwood, MONICKEL TO QUARTER SIZE HAIL AT 270 AND MCDONNELL
Mar 15, 4:20 PM CDTHAIL 0.751 Ssw Hazelwood, MOOFFICIALLY REPORTED FROM LAMBERT SAINT LOUIS INTERNATIONAL AIRPORT
Mar 15, 4:22 PM CDTHAIL 0.75Florissant, MOHAIL REPORTED AT HIGHWAY 270 AT GRAHAM ROAD.
Mar 15, 4:34 PM CDTHAIL 1Berkeley, MOQUARTER SIZE HAIL IN BERKELEY. REPORT RELAYED BY LOCAL MEDIA.

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, 9.2 hours before the alert went out and 208 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2012-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1579 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2012-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1579 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
117 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.

007 
WUUS53 KLSX 152112
SVRLSX
ILC083-119-MOC183-189-152200-
/O.NEW.KLSX.SV.W.0050.120315T2112Z-120315T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
412 PM CDT THU MAR 15 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 500 PM CDT

* AT 409 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR LAMBERT FIELD...AND MOVING NORTHEAST AT 15
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  BERKELEY...COOL VALLEY...KINLOCH...HAZELWOOD...JENNINGS...
  FERGUSON...DELLWOOD...FLORISSANT...BELLEFONTAINE NEIGHBORS...
  RIVERVIEW...BLACK JACK...SPANISH LAKE...ALTON...GODFREY...WOOD
  RIVER...BETHALTO...PORTAGE DES SIOUX...WEST ALTON AND DELHI.

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 3877 9017 3877 9019 3876 9019 3873 9023
      3872 9025 3868 9028 3863 9035 3873 9053
      3906 9026 3891 9001
TIME...MOT...LOC 2112Z 218DEG 14KT 3875 9037
WIND...HAIL <50MPH 1.00IN

$$

TRUETT
1 follow-up statement
333 
WWUS53 KLSX 152145
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
445 PM CDT THU MAR 15 2012

ILC083-119-MOC183-189-152146-
/O.CAN.KLSX.SV.W.0050.000000T0000Z-120315T2200Z/
JERSEY IL-MADISON IL-ST. CHARLES MO-ST. LOUIS MO-
445 PM CDT THU MAR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. LOUIS...
NORTHEASTERN ST. CHARLES...NORTHWESTERN MADISON AND SOUTHEASTERN
JERSEY COUNTIES 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 AS IT 
MOVES THROUGH EASTERN ST LOUIS COUNTY...FAR NORTHERN ST LOUIS 
CITY...EXTREME EASTERN ST. CHARLES COUNTY...AND WESTERN SECTIONS OF 
MADISON COUNTY.

LAT...LON 3877 9017 3877 9019 3876 9019 3873 9023
      3872 9025 3868 9028 3863 9035 3873 9053
      3906 9026 3891 9001
TIME...MOT...LOC 2136Z 246DEG 11KT 3877 9028

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 14, 7:00 PM CDTSevere Thunderstorm WarningLSXJefferson45 min
Mar 15, 1:56 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington49 min
Mar 15, 2:22 PM CDTSevere Thunderstorm WarningLSXCrawford19 min
Mar 15, 3:11 PM CDTFlash Flood WarningLSXCrawford, Washington3 hr
Mar 15, 3:19 PM CDTSevere Thunderstorm WarningLSXWashington26 min
Mar 15, 3:23 PM CDTSevere Thunderstorm WarningLSXFranklin, Saint Charles, Warren37 min
Mar 15, 3:27 PM CDTSevere Thunderstorm WarningLSXGasconade, Osage48 min
Mar 15, 3:47 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington19 min
Mar 15, 3:48 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington42 min
Mar 15, 3:59 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren46 min
Mar 15, 4:26 PM CDTFlash Flood WarningLSXCrawford, Washington3 hr
Mar 15, 4:46 PM CDTSevere Thunderstorm WarningLSXSaint Charles29 min
Mar 15, 4:50 PM CDTSevere Thunderstorm WarningLSXLincoln40 min
Mar 15, 5:20 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Warren26 min
Mar 15, 6:16 PM CDTFlash Flood WarningLSXCrawford, Washington4 hr
Mar 14, 7:41 PM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair31 min
Mar 15, 5:17 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey43 min
Mar 15, 5:52 PM CDTSevere Thunderstorm WarningLSXGreene38 min
Mar 15, 6:16 PM CDTSevere Thunderstorm WarningLSXMacoupin44 min
Mar 15, 6:50 PM CDTSevere Thunderstorm WarningLSXGreene, Pike29 min
Mar 15, 6:58 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery15 min

Nearby

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