Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 45, NWS St. Louis, MO

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

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 15, 2012, 3:23 PM CDT for Franklin County, Saint Charles County, Warren County, Missouri. It was in force for 37 min. 5 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, 3:23 PM CDT (20:23 UTC)
Expired: Mar 15, 2012, 4:00 PM CDT
In force: 37 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 29 km from the middle of the area, began a volume at 20:25 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
Mar 15, 3:32 PM CDT	HAIL 0.25	Washington, MO
Mar 15, 3:38 PM CDT	HAIL 0.7	Dutzow, MO
Mar 15, 3:40 PM CDT	HAIL 0.5	Washington, MO
Mar 15, 3:50 PM CDT	HAIL 1	6 Ne Marthasville, MO
Mar 15, 3:50 PM CDT	HAIL 1	Marthasville, MO	NICKEL TO QUARTER SIZED HAIL

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, 8.4 hours before the alert went out and 267 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: 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.

376 
WUUS53 KLSX 152023
SVRLSX
MOC071-183-219-152100-
/O.NEW.KLSX.SV.W.0045.120315T2023Z-120315T2100Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 400 PM CDT

* AT 320 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  WASHINGTON...AND MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WASHINGTON...MARTHASVILLE...DUTZOW AND AUGUSTA.

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 9098 3860 9079 3841 9108 3856 9119
TIME...MOT...LOC 2024Z 226DEG 21KT 3854 9108
WIND...HAIL 60MPH 1.00IN

$$

MILLER

2 follow-up statements

349 
WWUS53 KLSX 152049
SVSLSX

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

MOC071-152059-
/O.CAN.KLSX.SV.W.0045.000000T0000Z-120315T2100Z/
FRANKLIN MO-
349 PM CDT THU MAR 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL FRANKLIN COUNTY
IS CANCELLED...

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

LAT...LON 3861 9107 3877 9098 3860 9079 3860 9080
      3854 9091 3854 9093 3858 9103 3861 9105
TIME...MOT...LOC 2049Z 226DEG 21KT 3864 9095

$$

MOC183-219-152100-
/O.CON.KLSX.SV.W.0045.000000T0000Z-120315T2100Z/
ST. CHARLES MO-WARREN MO-
349 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WARREN AND SOUTHWESTERN ST. CHARLES COUNTIES UNTIL 400 PM CDT...

AT 345 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
DUTZOW...OR 6 MILES NORTHEAST OF WASHINGTON...MOVING NORTHEAST AT 25
MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHWESTERN ST. CHARLES COUNTY.

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 3861 9107 3877 9098 3860 9079 3860 9080
      3854 9091 3854 9093 3858 9103 3861 9105
TIME...MOT...LOC 2049Z 226DEG 21KT 3864 9095
WIND...HAIL 60MPH 1.00IN

$$

MILLER

501 
WWUS53 KLSX 152053
SVSLSX

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

MOC183-219-152100-
/O.CON.KLSX.SV.W.0045.000000T0000Z-120315T2100Z/
ST. CHARLES MO-WARREN MO-
353 PM CDT THU MAR 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WARREN AND SOUTHWESTERN ST. CHARLES COUNTIES UNTIL 400 PM CDT...

AT 350 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 DUTZOW...OR 7 MILES
NORTHEAST OF WASHINGTON...MOVING NORTHEAST AT 25 MPH.

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

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHWESTERN ST. CHARLES COUNTY.

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 3861 9107 3877 9098 3860 9079 3860 9080
      3854 9091 3854 9093 3858 9103 3861 9105
TIME...MOT...LOC 2053Z 226DEG 21KT 3866 9093
WIND...HAIL 60MPH 1.75IN

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 14, 7:00 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	45 min
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, 3:27 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

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.