Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 281, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Sep 7, 2012, 4:11 PM CDT for Monroe County, Illinois. It was in force for 24 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
- Sep 7, 2012, 4:11 PM CDT (21:11 UTC)
- Expired
- Sep 7, 2012, 4:35 PM CDT
- In force
- 24 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Monroe County, IL
The radar
The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 21:11 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 |
|---|---|---|---|
| Sep 7, 4:15 PM CDT | TSTM WND DMG | Waterloo, IL | SEVERAL LARGE TREES BLOWN DOWN IN TOWN...ONE WAS 36 INCHES IN DIAMETER. |
| Sep 7, 4:18 PM CDT | HAIL 0.25 | Waterloo, IL |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 7, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.2 hours before the alert went out and 239 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
- 367 J/kg
- Mixed-layer CIN
- -412 J/kg
- Mixed-layer LCL
- 1436 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
781
WUUS53 KLSX 072111
SVRLSX
ILC133-072145-
/O.NEW.KLSX.SV.W.0281.120907T2111Z-120907T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
411 PM CDT FRI SEP 7 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL MONROE COUNTY IN SOUTHWEST ILLINOIS...
* UNTIL 445 PM CDT
* AT 406 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WATERLOO...
AND MOVING EAST AT 20 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
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...
HECKER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3829 8993 3827 9022 3837 9024 3840 9013
3832 9004 3831 9003 3831 8996
TIME...MOT...LOC 2112Z 249DEG 16KT 3833 9015
HAIL...1.00IN
WIND...60 MPH
$$
TES2 follow-up statements
263
WWUS53 KLSX 072119
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
419 PM CDT FRI SEP 7 2012
ILC133-072145-
/O.CON.KLSX.SV.W.0281.000000T0000Z-120907T2145Z/
MONROE IL-
419 PM CDT FRI SEP 7 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL MONROE
COUNTY UNTIL 445 PM CDT...
AT 415 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WATERLOO...AND
MOVING EAST AT 20 MPH.
HAZARD...QUARTER SIZE HAIL AND 60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. MINOR TREE
DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER BROKEN.
LOCATIONS IMPACTED INCLUDE...
HECKER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3829 8993 3827 9022 3837 9024 3840 9013
3832 9004 3831 9003 3831 8996
TIME...MOT...LOC 2120Z 256DEG 19KT 3834 9010
HAIL...1.00IN
WIND...60 MPH
$$
TES412
WWUS53 KLSX 072135
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
435 PM CDT FRI SEP 7 2012
ILC133-072145-
/O.CAN.KLSX.SV.W.0281.000000T0000Z-120907T2145Z/
MONROE IL-
435 PM CDT FRI SEP 7 2012
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONROE COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.
ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM CDT.
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 3829 8993 3827 9022 3837 9024 3840 9013
3832 9004 3831 9003 3831 8996
TIME...MOT...LOC 2135Z 256DEG 19KT 3836 9000
$$
TESThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 3:36 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 54 min |
| Sep 7, 4:00 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey | 45 min |
| Sep 7, 4:32 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 43 min |
| Sep 7, 4:58 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair, Washington | 47 min |
| Sep 7, 5:36 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Madison, Montgomery | 54 min |
| Sep 7, 6:50 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 40 min |
Nearby
Severe 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.