Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 217, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jul 8, 2012, 6:49 PM CDT for Saint Louis County, City of Saint Louis, Missouri; Saint Clair County, Illinois. It was in force for 41 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
- Jul 8, 2012, 6:49 PM CDT (23:49 UTC)
- Expired
- Jul 8, 2012, 7:30 PM CDT
- In force
- 41 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Saint Clair County, IL, City of Saint Louis, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 45 km from the middle of the area, began a volume at 23:49 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, 6:59 PM CDT | HAIL 1.75 | Dupo, IL | |
| Jul 8, 7:00 PM CDT | HAIL 1.75 | East Carondelet, IL | GOLF BALL SIZE HAIL REPORTED BY AMATTEUR RADIO OPERATOR IN EAST CARONDELET |
| Jul 8, 7:15 PM CDT | TSTM WND DMG | Mehlville, MO | TWO TO FOUR INCH DIAMETER TREE LIMBS DOWN. |
| Jul 8, 7:25 PM CDT | TSTM WND GST 55 | Mehlville, MO | ESTIIMATED 50 TO 55 MPH - SMALL LIMBS 1 TO 3 INCH DIAMETER.. |
| Jul 8, 7:27 PM CDT | HAIL 0.5 | Mehlville, MO | |
| Jul 8, 7:35 PM CDT | TSTM WND GST 60 | Mehlville, MO | TREE BRANCHES OF 6 TO 8 INCH DIAMETER WERE DOWN. HAIL OF 0.50 INCH FELL AT THIS LOCATION. |
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, 11.8 hours before the alert went out and 228 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
862
WUUS53 KLSX 082349
SVRLSX
ILC163-MOC189-510-090030-
/O.NEW.KLSX.SV.W.0217.120708T2349Z-120709T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
649 PM CDT SUN JUL 8 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
CENTRAL ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
ST. LOUIS CITY IN EAST CENTRAL MISSOURI...
* UNTIL 730 PM CDT
* AT 644 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CAHOKIA...
AND MOVING WEST AT 15 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...
LEMAY...MEHLVILLE AND EAST CARONDELET.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST
LOUIS.
TORRENTIAL RAINFALL MAY OCCUR WITH THIS STORM...AND COULD LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!
&&
LAT...LON 3849 9010 3848 9022 3852 9026 3849 9027
3848 9028 3848 9033 3866 9030 3866 9010
TIME...MOT...LOC 2349Z 077DEG 14KT 3856 9022
HAIL...0.75IN
WIND...60 MPH
$$
TES2 follow-up statements
139
WWUS53 KLSX 090004
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
704 PM CDT SUN JUL 8 2012
ILC163-MOC189-510-090030-
/O.CON.KLSX.SV.W.0217.000000T0000Z-120709T0030Z/
ST. CLAIR IL-ST. LOUIS MO-ST. LOUIS CITY MO-
704 PM CDT SUN JUL 8 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ST. LOUIS
CITY...SOUTHEASTERN ST. LOUIS AND NORTHWESTERN ST. CLAIR COUNTIES
UNTIL 730 PM CDT...
AT 701 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR EAST
CARONDELET...AND MOVING WEST AT 10 MPH.
HAZARD...GOLF BALL SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...EMERGENCY MANAGEMENT IN SAINT CLAIR COUNTY REPORTED GOLF
BALL SIZED HAIL IN DUPO AT 659 PM.
IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE DAMAGE...
WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
LOCATIONS IMPACTED INCLUDE...
LEMAY AND MEHLVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.
TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST
LOUIS.
TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!
&&
LAT...LON 3849 9010 3848 9022 3852 9026 3849 9027
3848 9028 3848 9033 3866 9030 3866 9010
TIME...MOT...LOC 0004Z 082DEG 9KT 3854 9024
HAIL...1.75IN
WIND...60 MPH
$$
TES913
WWUS53 KLSX 090031
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
731 PM CDT SUN JUL 8 2012
ILC163-MOC189-510-090041-
/O.EXP.KLSX.SV.W.0217.000000T0000Z-120709T0030Z/
ST. CLAIR IL-ST. LOUIS MO-ST. LOUIS CITY MO-
731 PM CDT SUN JUL 8 2012
...THE SEVERE THUNDERSTORM WARNING FOR ST. LOUIS CITY AND
NORTHWESTERN ST. CLAIR COUNTIES HAS EXPIRED...
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEAST ST. LOUIS COUNTY
HAS BEEN REISSUED...
PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION. HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE
WITH THIS THUNDERSTORM.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN ST LOUIS.
LAT...LON 3849 9010 3848 9022 3852 9026 3849 9027
3848 9028 3848 9033 3866 9030 3866 9010
TIME...MOT...LOC 0004Z 082DEG 9KT 3854 9024
$$
TESThe 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, 3:41 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Washington | 49 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 7, 8:40 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 50 min |
| Jul 8, 2:29 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Fayette, Marion | 46 min |
| Jul 8, 5:03 PM CDT | Severe Thunderstorm Warning | LSX | Randolph | 42 min |
| Jul 8, 5:42 PM CDT | Severe Thunderstorm Warning | LSX | Randolph | 48 min |
| Jul 8, 5:44 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 46 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.