Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 101, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 25, 2012, 11:55 PM CDT for Madison County, Illinois. It was in force for 50 min. 5 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
- Apr 25, 2012, 11:55 PM CDT (04:55 UTC)
- Expired
- Apr 26, 2012, 12:45 AM CDT
- In force
- 50 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
County Madison County, IL
The radar
The St Louis radar (KLSX), 70 km from the middle of the area, began a volume at 04:55 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 |
|---|---|---|---|
| Apr 26, 12:12 AM CDT | HAIL 0.75 | 1 Se Carpenter, IL | NICKLE SIZE HAIL 1.0 MILE SOUTHEAST OF CARPENTER ILLINOIS. VERY LITTLE WIND. |
| Apr 26, 12:15 AM CDT | HAIL 1 | Marine, IL | |
| Apr 26, 12:25 AM CDT | HAIL 1.75 | 2 S Highland, IL | 1.0 INCH TO 1.75 INCH HAIL COVERED THE GROUND 2 MILES SOUTH OF HIGHLAND ILLINOIS. THE HAIL HAS COVERED THE GROUND AND A FOG BANK HAS DEVELOPED. |
| Apr 26, 12:30 AM CDT | HAIL 1 | 3 S Highland, IL | |
| Apr 26, 12:33 AM CDT | HAIL 0.75 | 2 S Highland, 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 |
|---|---|---|---|
| Apr 25, 7:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.9 hours before the alert went out and 187 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
- 1745 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1353 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 261 m²/s²
- 0-3 km storm-relative helicity
- 449 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 4.2
The text
As transmitted, in the capitals the NWS used until 2016.
066 WUUS53 KLSX 260455 SVRLSX ILC119-260545- /O.NEW.KLSX.SV.W.0101.120426T0455Z-120426T0545Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 1155 PM CDT WED APR 25 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MADISON COUNTY IN SOUTHWEST ILLINOIS... * UNTIL 1245 AM CDT * AT 1151 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BETHALTO... AND MOVING SOUTHEAST AT 45 MPH. HAZARD...HALF DOLLAR SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. * LOCATIONS IMPACTED INCLUDE... EDWARDSVILLE...GLEN CARBON...MARYVILLE...TROY...ROXANA... CARPENTER...MARINE...ST. JACOB...POAG...FRUIT AND KUHN. 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 3866 8962 3866 8994 3900 9026 3900 9001 TIME...MOT...LOC 0455Z 317DEG 40KT 3889 9002 HAIL...1.25IN WIND...<50 MPH $$ CVKING
1 follow-up statement
561 WWUS53 KLSX 260511 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1211 AM CDT THU APR 26 2012 ILC119-260545- /O.CON.KLSX.SV.W.0101.000000T0000Z-120426T0545Z/ MADISON IL- 1211 AM CDT THU APR 26 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN MADISON COUNTY UNTIL 1245 AM CDT... AT 1209 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR MARINE...AND MOVING SOUTHEAST AT 45 MPH. HAZARD...HALF DOLLAR SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. LOCATIONS IMPACTED INCLUDE... MARINE AND ST. JACOB. PRECAUTIONARY/PREPAREDNESS ACTIONS... PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM WINDOWS. && LAT...LON 3882 8995 3889 8989 3866 8962 3866 8980 TIME...MOT...LOC 0511Z 313DEG 39KT 3880 8984 HAIL...1.25IN WIND...<50 MPH $$ CVKING
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 8:21 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 54 min |
| Apr 25, 9:13 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 62 min |
| Apr 25, 9:50 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 40 min |
| Apr 25, 10:21 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Pike | 39 min |
| Apr 25, 10:53 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin | 67 min |
| Apr 25, 11:38 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 37 min |
| Apr 25, 11:44 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Madison, Montgomery | 46 min |
| Apr 26, 12:18 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Madison | 42 min |
| Apr 26, 12:45 AM CDT | Severe Thunderstorm Warning | LSX | Washington | 45 min |
| Apr 26, 2:06 AM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 28 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.