Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 72, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Mar 17, 2012, 3:59 PM CDT for Jefferson County, Missouri; Monroe County, Illinois. It was in force for 46 min. 2 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 17, 2012, 3:59 PM CDT (20:59 UTC)
- Expired
- Mar 17, 2012, 4:45 PM CDT
- In force
- 46 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), 66 km from the middle of the area, began a volume at 20:59 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 17, 4:05 PM CDT | HAIL 0.25 | 1 S Festus, MO | |
| Mar 17, 4:30 PM CDT | HAIL 0.7 | Waterloo, IL | HEAVY RAIN AT TIME OF REPORT. |
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 255 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
- 1656 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 642 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
972
WUUS53 KLSX 172059
SVRLSX
ILC133-MOC099-172145-
/O.NEW.KLSX.SV.W.0072.120317T2059Z-120317T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
359 PM CDT SAT MAR 17 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MONROE COUNTY IN SOUTHWEST ILLINOIS...
EAST CENTRAL JEFFERSON 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 QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR OLYMPIAN VILLAGE...OR 6 MILES SOUTH OF
CRYSTAL CITY...AND MOVING NORTHEAST AT 25 MPH.
* LOCATIONS IMPACTED INCLUDE...
FESTUS...CRYSTAL CITY...HERCULANEUM...WATERLOO...VALMEYER...
FOUNTAIN...NEW DESIGN...FULTS...CHALFIN BRIDGE...HARRISONVILLE...
MAEYSTOWN...MONROE CITY...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 9024 3812 9025 3809 9029 3810 9033
3806 9039 3815 9051 3847 9020 3843 9015
3841 9015 3832 9004 3831 9003 3831 8999
TIME...MOT...LOC 2100Z 221DEG 22KT 3816 9035
WIND...HAIL <50MPH 1.00IN
$$
TILLY2 follow-up statements
754
WWUS53 KLSX 172124
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
424 PM CDT SAT MAR 17 2012
MOC099-172135-
/O.CAN.KLSX.SV.W.0072.000000T0000Z-120317T2145Z/
JEFFERSON MO-
424 PM CDT SAT MAR 17 2012
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL JEFFERSON COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 3823 9020 3822 9036 3824 9037 3829 9037
3847 9020 3843 9015 3841 9015 3831 9004
TIME...MOT...LOC 2125Z 213DEG 22KT 3829 9031
$$
ILC133-172145-
/O.CON.KLSX.SV.W.0072.000000T0000Z-120317T2145Z/
MONROE IL-
424 PM CDT SAT MAR 17 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
MONROE COUNTY UNTIL 445 PM CDT...
AT 423 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR VALMEYER...OR NEAR HERCULANEUM...MOVING
NORTHEAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE...
WATERLOO...VALMEYER...FOUNTAIN...MADONNAVILLE...BURKSVILLE...
WARTBURG...FOSTER POND 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 3823 9020 3822 9036 3824 9037 3829 9037
3847 9020 3843 9015 3841 9015 3831 9004
TIME...MOT...LOC 2125Z 213DEG 22KT 3829 9031
WIND...HAIL <50MPH 1.00IN
$$
TES129
WWUS53 KLSX 172143
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
443 PM CDT SAT MAR 17 2012
ILC133-172154-
/O.EXP.KLSX.SV.W.0072.000000T0000Z-120317T2145Z/
MONROE IL-
443 PM CDT SAT MAR 17 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MONROE COUNTY WILL
EXPIRE AT 445 PM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.
LAT...LON 3823 9020 3822 9036 3824 9037 3829 9037
3847 9020 3843 9015 3841 9015 3831 9004
TIME...MOT...LOC 2144Z 213DEG 22KT 3839 9023
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 17, 2:22 PM CDT | Flash Flood Warning | LSX | Osage | 4 hr |
| Mar 17, 3:38 PM CDT | Flash Flood Watch | LSX | Crawford, Franklin, Gasconade, Jefferson, Osage, Saint Charles and 6 more | 6 hr |
| Mar 17, 4:54 PM CDT | Areal Flood Advisory | LSX | Saint Louis, City of Saint Louis | 4 hr |
| Mar 17, 5:13 PM CDT | Areal Flood Advisory | LSX | Saint Charles | 4 hr |
| Mar 17, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Crawford | 25 min |
| Mar 17, 6:13 PM CDT | Flash Flood Warning | LSX | Crawford | 6 hr |
| Mar 17, 6:23 PM CDT | Flash Flood Warning | LSX | Osage | 4 hr |
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.