Alert archive / Illinois / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 146, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at May 4, 2012, 6:27 AM CDT for Macoupin County, Illinois. It was in force for 33 min. 3 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
- May 4, 2012, 6:27 AM CDT (11:27 UTC)
- Expired
- May 4, 2012, 7:00 AM CDT
- In force
- 33 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Macoupin County, IL
The radar
The St Louis radar (KLSX), 81 km from the middle of the area, began a volume at 11:30 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 |
|---|---|---|---|
| May 4, 6:40 AM CDT | HAIL 0.25 | Gillespie, IL | TIME ESTIMATED FROM RADAR. |
| May 4, 6:43 AM CDT | HAIL 0.25 | Bunker Hill, IL | |
| May 4, 6:51 AM CDT | HAIL 0.5 | Dorchester, IL | TIME ESTIMATED BY RADAR. |
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 00:00Z, 11.5 hours before the alert went out and 162 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
- 1905 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1071 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
659 WUUS53 KLSX 041127 SVRLSX ILC117-041200- /O.NEW.KLSX.SV.W.0146.120504T1127Z-120504T1200Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 627 AM CDT FRI MAY 4 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS... * UNTIL 700 AM CDT * AT 625 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BUNKER HILL...AND MOVING EAST AT 35 MPH. HAZARD...QUARTER SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. * LOCATIONS IMPACTED INCLUDE... GILLESPIE...STAUNTON...BUNKER HILL...WILSONVILLE...BENLD...MOUNT OLIVE...ROYAL LAKES...PRUETT...DORCHESTER...WHITE CITY AND HORNSBY. 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. TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. && LAT...LON 3900 8970 3900 9013 3913 9014 3921 8970 TIME...MOT...LOC 1127Z 263DEG 31KT 3907 8999 HAIL...1.00IN WIND...<50 MPH $$ TES
2 follow-up statements
524 WWUS53 KLSX 041143 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 643 AM CDT FRI MAY 4 2012 ILC117-041200- /O.CON.KLSX.SV.W.0146.000000T0000Z-120504T1200Z/ MACOUPIN IL- 643 AM CDT FRI MAY 4 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN MACOUPIN COUNTY UNTIL 700 AM CDT... AT 638 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WILSONVILLE... AND MOVING EAST AT 40 MPH. HAZARD...QUARTER SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...MINOR DAMAGE TO VEHICLES...ROOFS AND WINDOWS. LOCATIONS IMPACTED INCLUDE... GILLESPIE...STAUNTON...BENLD...MOUNT OLIVE...WHITE CITY AND HORNSBY. PRECAUTIONARY/PREPAREDNESS ACTIONS... PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM WINDOWS. TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. && LAT...LON 3900 8970 3900 9013 3913 9014 3921 8970 TIME...MOT...LOC 1143Z 262DEG 34KT 3908 8983 HAIL...1.00IN WIND...<50 MPH $$ TES
357 WWUS53 KLSX 041157 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 657 AM CDT FRI MAY 4 2012 ILC117-041208- /O.EXP.KLSX.SV.W.0146.000000T0000Z-120504T1200Z/ MACOUPIN IL- 657 AM CDT FRI MAY 4 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MACOUPIN COUNTY WILL EXPIRE AT 700 AM CDT... 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 IS STILL POSSIBLE WITH THIS THUNDERSTORM. 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 3900 8970 3900 9013 3913 9014 3921 8970 TIME...MOT...LOC 1158Z 262DEG 34KT 3910 8965 $$ TES
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 4:03 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 42 min |
| May 4, 11:11 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Saint Clair, Washington | 34 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.