Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 49, NWS St. Louis, MO

March 15, 2012Saint Charles County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 15, 2012, 3:59 PM CDT for Saint Charles County, Warren County, Missouri. It was in force for 46 min. 31 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, 3:59 PM CDT (20:59 UTC)
Expired
Mar 15, 2012, 4:45 PM CDT
In force
46 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.75 in
Wind
60.0 mph

Counties Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 12 km from the middle of the area, began a volume at 21:00 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, 4:02 PM CDTHAIL 1.25New Melle, MO
Mar 15, 4:04 PM CDTHAIL 1.75New Melle, MO
Mar 15, 4:05 PM CDTHAIL 2.5New Melle, MOSIDING AND GARAGE DOOR DAMAGED. GOFLBALL TO TENNIS BALL SIZE HAIL.
Mar 15, 4:10 PM CDTHAIL 1.75New Melle, MO
Mar 15, 4:11 PM CDTHAIL 2.25Lake St. Louis, MOMEASURED AT HWY N AND WYNDGATE RIDGE DR
Mar 15, 4:15 PM CDTHAIL 1.75Lake St. Louis, MO
Mar 15, 4:15 PM CDTHAIL 1.75New Melle, MOWINDSHIELD DAMAGE TO CAR. DOWNED CEDAR LIMBS. HAIL COVERED THE GROUND.
Mar 15, 4:15 PM CDTHAIL 2.75O'Fallon, MOSPOTTER IS LOCATED SOUTH OF N AND 2 MILES WEST OF 61
Mar 15, 4:18 PM CDTHAIL 2Dardenne Prairie, MOHAIL JUST OVER 2 INCHES IN DIAMETER LASTED ABOUT 3-4 MINUTES.
Mar 15, 4:18 PM CDTHAIL 2.752 Wnw Dardenne Prairie, MOSTORM CHASER REPORTS SEVERAL HAILSTONES OF BASEBALL SIZE AT WINGHAVEN BLVD AND I-64
Mar 15, 4:24 PM CDTHAIL 1.5Dardenne Prairie, MO
Mar 15, 4:24 PM CDTHAIL 1.752 Sw O'Fallon, MO
Mar 15, 4:24 PM CDTHAIL 2O'Fallon, MOAT FEISE AND BRYAN RD
Mar 15, 4:25 PM CDTHAIL 1.75Dardenne Prairie, MO
Mar 15, 4:25 PM CDTHAIL 23 Ssw O'Fallon, MO
Mar 15, 4:26 PM CDTHAIL 0.88O'Fallon, MO
Mar 15, 4:27 PM CDTHAIL 0.88St. Peters, MOHAIL RANGED FROM ONE HALF INCH TO NICKEL SIZE AND LASTED ABOUT 5 MINUTES
Mar 15, 4:27 PM CDTHAIL 1.75O'Fallon, MOAT I-70 AND VETERANS MEMORIAL PKWY BETWEEN BRYAN RD AND HWY K
Mar 15, 4:28 PM CDTHAIL 1O'Fallon, MO
Mar 15, 4:30 PM CDTHAIL 0.88O'Fallon, MOON MEXICO RD ONE HALF MILE WEST OF FORT ZUMWALT HIGH SCHOOL
Mar 15, 4:31 PM CDTHAIL 1O'Fallon, MOI-70 AND TR HUGHS BLVD. QUARTER SIZE HAIL COVERING THE GROUND.
Mar 15, 4:32 PM CDTHAIL 1.753 S O'Fallon, MORETIRED NWS EMPLOYEE REPORTS GOLFBALL HAIL 3 MILES SOUTH OF OFALLON
Mar 15, 4:33 PM CDTHAIL 0.25St. Peters, MO
Mar 15, 4:38 PM CDTHAIL 1.754 S Old Monroe, MOLOCATION APPROXIMATE. SPOTTER IS IN ST. CHARLES COUNTY SOUTH OF OLD MONROE AND JUST NORTH OF I-70 AND WEST OF HIGHWAY 79.
Mar 15, 4:39 PM CDTHAIL 0.25O'Fallon, MOWEST OF 79 AND NORTH OF I-70. RAIN HAS ENDED BUT HAIL CONTINUES.
Mar 15, 4:40 PM CDTHAIL 1.5O'Fallon, MOHAIL REPORTED OVER NORTHERN OFALLON CITY.
Mar 15, 4:45 PM CDTHAIL 1.25St. Peters, MO
Mar 15, 4:49 PM CDTHAIL 1.5St. Peters, MOAT I-70 AND HWY 79. HAIL RANGED FROM QUARTER SIZE TO PING PONG BALL SIZE.
Mar 15, 4:50 PM CDTHAIL 0.88St. Charles, MOHAIL REPORTED AT 370 AND ELM STREET.
Mar 15, 4:52 PM CDTHAIL 0.88O'Fallon, MO
Mar 15, 4:54 PM CDTHAIL 0.25St. Charles, MO

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, 9.0 hours before the alert went out and 235 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.

824 
WUUS53 KLSX 152059
SVRLSX
MOC183-219-152145-
/O.NEW.KLSX.SV.W.0049.120315T2059Z-120315T2145Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 445 PM CDT

* AT 355 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  NEW MELLE...OR 9 MILES NORTHEAST OF WASHINGTON...AND MOVING
  NORTHEAST AT 25 MPH.

  AT 350 PM QUARTER SIZE HAIL WAS REPORTED AT MARTHASVILLE WITH
  THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  WENTZVILLE...LAKE ST. LOUIS...DARDENNE PRAIRIE...WELDON SPRING...
  O'FALLON...COTTLEVILLE...ST. PAUL...ST. PETERS...ST. CHARLES...
  DEFIANCE...NEW MELLE...HARVESTER...FORISTELL...FLINT HILL AND
  KAMPVILLE.

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 3869 9056 3868 9068 3860 9077 3855 9091
      3868 9108 3889 9095 3889 9091 3888 9082
      3891 9080 3892 9070 3891 9069 3893 9067
      3887 9058 3888 9054 3890 9051 3883 9043
TIME...MOT...LOC 2059Z 224DEG 23KT 3869 9091
WIND...HAIL 60MPH 1.75IN

$$

MILLER
3 follow-up statements
000
WWUS53 KLSX 152110
SVSLSX

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

MOC219-152120-
/O.CAN.KLSX.SV.W.0049.000000T0000Z-120315T2145Z/
WARREN MO-
410 PM CDT THU MAR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WARREN COUNTY IS
CANCELLED...

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

LAT...LON 3869 9056 3869 9065 3862 9083 3871 9096
      3888 9081 3891 9080 3891 9072 3892 9070
      3891 9069 3893 9067 3887 9058 3888 9054
      3890 9051 3883 9043
TIME...MOT...LOC 2110Z 224DEG 23KT 3874 9085

$$

MOC183-152145-
/O.CON.KLSX.SV.W.0049.000000T0000Z-120315T2145Z/
ST. CHARLES MO-
410 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ST. CHARLES
COUNTY UNTIL 445 PM CDT...

AT 405 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR NEW MELLE...OR 7 MILES
SOUTH OF WENTZVILLE...MOVING NORTHEAST AT 25 MPH.

IN ADDITION...AT 404 PM GOLF BALL SIZE HAIL WAS REPORTED IN NEW MELLE
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  WENTZVILLE...LAKE ST. LOUIS...DARDENNE PRAIRIE...WELDON SPRING...
  O'FALLON...COTTLEVILLE...ST. PAUL...ST. PETERS...ST. CHARLES...
  HARVESTER AND KAMPVILLE.

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 3869 9056 3869 9065 3862 9083 3871 9096
      3888 9081 3891 9080 3891 9072 3892 9070
      3891 9069 3893 9067 3887 9058 3888 9054
      3890 9051 3883 9043
TIME...MOT...LOC 2110Z 224DEG 23KT 3874 9085
WIND...HAIL 60MPH 1.75IN

$$

MILLER
402 
WWUS53 KLSX 152119
SVSLSX

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

MOC183-152145-
/O.CON.KLSX.SV.W.0049.000000T0000Z-120315T2145Z/
ST. CHARLES MO-
419 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ST. CHARLES
COUNTY UNTIL 445 PM CDT...

AT 414 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING LARGE DESTRUCTIVE HAIL UP TO TENNIS BALL
SIZE...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR LAKE ST. LOUIS...MOVING NORTHEAST AT 25 MPH.

IN ADDITION...AT 415 PM NEAR HIGHWAY N AND AND INTERSTATE 64 BASEBALL
SIZE HAIL WAS REPORTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  LAKE ST. LOUIS...DARDENNE PRAIRIE...O'FALLON...COTTLEVILLE...ST.
  PAUL...ST. PETERS AND KAMPVILLE.

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.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3867 9078 3876 9087 3891 9072 3892 9070
      3891 9069 3893 9067 3890 9063 3889 9063
      3887 9058 3888 9054 3890 9051 3883 9043
TIME...MOT...LOC 2119Z 224DEG 23KT 3878 9080
WIND...HAIL 60MPH 2.50IN

$$

MILLER
000
WWUS53 KLSX 152129
SVSLSX

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

MOC183-152145-
/O.CON.KLSX.SV.W.0049.000000T0000Z-120315T2145Z/
ST. CHARLES MO-
429 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL ST.
CHARLES COUNTY UNTIL 445 PM CDT...

AT 424 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM PRODUCING LARGE DESTRUCTIVE HAIL UP TO TENNIS BALL
SIZE...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR LAKE ST. LOUIS...MOVING NORTHEAST AT 25 MPH.

IN ADDITION...AT 424 PM 2 INCH SIZE HAIL WAS REPORTED IN DARDENNE
PRAIRIE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  ST. PAUL...ST. PETERS AND KAMPVILLE.

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.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3870 9073 3877 9079 3891 9072 3892 9070
      3891 9069 3893 9067 3890 9063 3889 9063
      3887 9058 3888 9054 3890 9051 3883 9043
TIME...MOT...LOC 2128Z 224DEG 23KT 3882 9075
WIND...HAIL 60MPH 2.50IN

$$

MILLER

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, 4:12 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis33 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

Nearby

Severe Thunderstorm Warnings in Missouri, 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.