Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 376, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 21, 2011, 7:28 PM CDT for Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 47 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
- Jun 21, 2011, 7:28 PM CDT (00:28 UTC)
- Expired
- Jun 21, 2011, 8:15 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 70.0 mph
Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 00:30 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 |
|---|---|---|---|
| Jun 21, 7:57 PM CDT | HAIL 0.88 | 3 Sw New Athens, IL | |
| Jun 21, 7:58 PM CDT | TSTM WND DMG | 3 W New Athens, IL | SEVERAL POWER POLES SNAPPED ON CALMUS LAKE SCHOOL ROAD |
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 |
|---|---|---|---|
| Jun 21, 1:22 PM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.5 hours before the alert went out and 241 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
- 3122 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 829 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 3.5
- Supercell composite
- 15.3
The text
As transmitted, in the capitals the NWS used until 2016.
662
WUUS53 KLSX 220028
SVRLSX
ILC133-157-163-220115-
/O.NEW.KLSX.SV.W.0376.110622T0028Z-110622T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
728 PM CDT TUE JUN 21 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
MONROE COUNTY IN SOUTHWEST ILLINOIS...
NORTH CENTRAL RANDOLPH COUNTY IN SOUTHWEST ILLINOIS...
SOUTHERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
* UNTIL 815 PM CDT
* AT 726 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS
LOCATED NEAR NEW DESIGN...OR 6 MILES SOUTH OF WATERLOO...AND MOVING
EAST AT 25 MPH.
* LOCATIONS IMPACTED INCLUDE...
WATERLOO...RED BUD...FREEBURG...MASCOUTAH...NEW DESIGN...
SMITHTON...NEW ATHENS...MARISSA...BARR...FLORAVILLE...PADERBORN...
HECKER...LENZBURG AND FAYETTEVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
&&
LAT...LON 3812 9020 3834 9031 3854 8980 3825 8970
3823 8970
TIME...MOT...LOC 0028Z 252DEG 20KT 3825 9015
WIND...HAIL 70MPH 1.50IN
$$
GKS2 follow-up statements
953
WWUS53 KLSX 220058
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
758 PM CDT TUE JUN 21 2011
ILC133-157-163-220115-
/O.CON.KLSX.SV.W.0376.000000T0000Z-110622T0115Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-
758 PM CDT TUE JUN 21 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN ST.
CLAIR...NORTH CENTRAL RANDOLPH AND MONROE COUNTIES UNTIL 815 PM
CDT...
AT 755 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR NEW
ATHENS...OR 7 MILES NORTH OF RED BUD...MOVING EAST AT 30 MPH.
LOCATIONS IMPACTED INCLUDE...
FREEBURG...MASCOUTAH...NEW ATHENS...MARISSA...LENZBURG AND
FAYETTEVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.
&&
LAT...LON 3812 9020 3834 9031 3854 8980 3825 8970
3823 8970
TIME...MOT...LOC 0057Z 250DEG 26KT 3831 8993
WIND...HAIL 60MPH 1.00IN
$$
GKS848
WWUS53 KLSX 220116
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
816 PM CDT TUE JUN 21 2011
ILC133-157-163-220126-
/O.EXP.KLSX.SV.W.0376.000000T0000Z-110622T0115Z/
MONROE IL-RANDOLPH IL-ST. CLAIR IL-
816 PM CDT TUE JUN 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ST. CLAIR...NORTH
CENTRAL RANDOLPH AND MONROE COUNTIES HAS EXPIRED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE
WITH THIS THUNDERSTORM.
LAT...LON 3812 9020 3834 9031 3854 8980 3825 8970
3823 8970
TIME...MOT...LOC 0058Z 250DEG 26KT 3831 8992
$$
GKSThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 8:43 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair, Washington | 47 min |
| Jun 21, 9:53 PM CDT | Areal Flood Advisory | LSX | Randolph, Saint Clair, Washington | 3 hr |
| Jun 21, 10:12 PM CDT | Flash Flood Warning | LSX | Randolph, Saint Clair, Washington | 6 hr |
Nearby
Severe Thunderstorm Warnings in Illinois, 2011Every severe thunderstorm warning in 2011
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.