Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 171, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 4, 2012, 5:20 PM CDT for Monroe County, Illinois; Jefferson County, Missouri. It was in force for 17 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 4, 2012, 5:20 PM CDT (22:20 UTC)
- Expired
- Jun 4, 2012, 5:37 PM CDT
- In force
- 17 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Monroe County, IL, Jefferson County, MO
The radar
The St Louis radar (KLSX), 58 km from the middle of the area, began a volume at 22:23 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 4, 3:25 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 264 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1375 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
073
WUUS53 KLSX 042220
SVRLSX
ILC133-MOC099-042315-
/O.NEW.KLSX.SV.W.0171.120604T2220Z-120604T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
520 PM CDT MON JUN 4 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WESTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 615 PM CDT
* AT 515 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR ANTONIA...
AND MOVING SOUTH AT 25 MPH.
HAZARD...PING PONG BALL SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...TRAINED WEATHER SPOTTERS. PING PONG SIZE HAIL HAS BEEN
REPORTED NEAR HIGH RIDGE WITH THIS STORM.
IMPACT...DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
* LOCATIONS IMPACTED INCLUDE...
ANTONIA...BARNHART...PEVELY...HILLSBORO...HERCULANEUM...FESTUS...
CRYSTAL CITY...DE SOTO...VALMEYER...OLYMPIAN VILLAGE...OTTO...
KIMMSWICK...MAPAVILLE...HARRISONVILLE...HEMATITE...MONROE CITY...
VICTORIA...MAEYSTOWN...CHALFIN BRIDGE AND FULTS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.
&&
LAT...LON 3801 9055 3845 9064 3849 9041 3848 9042
3846 9042 3845 9038 3815 9018 3812 9025
3813 9025 3809 9032 3810 9033 3805 9042
TIME...MOT...LOC 2218Z 342DEG 20KT 3839 9049
HAIL...1.50IN
WIND...60 MPH
$$
BRITT1 follow-up statement
929
WWUS53 KLSX 042237
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
537 PM CDT MON JUN 4 2012
ILC133-MOC099-042246-
/O.CAN.KLSX.SV.W.0171.000000T0000Z-120604T2315Z/
MONROE IL-JEFFERSON MO-
537 PM CDT MON JUN 4 2012
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JEFFERSON AND
SOUTHWESTERN MONROE COUNTIES IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM.
LAT...LON 3801 9055 3845 9064 3849 9041 3848 9042
3846 9042 3845 9038 3815 9018 3812 9025
3813 9025 3809 9032 3810 9033 3805 9042
TIME...MOT...LOC 2236Z 342DEG 20KT 3829 9045
$$
BRITTThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 2:57 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey | 48 min |
| Jun 4, 3:33 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 42 min |
| Jun 4, 4:38 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 52 min |
| Jun 4, 4:08 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis | 37 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2012Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.