Alert archive / Illinois / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 417, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 27, 2011, 2:09 AM CDT for Greene County, Macoupin County, Illinois. It was in force for 36 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 27, 2011, 2:09 AM CDT (07:09 UTC)
- Expired
- Jun 27, 2011, 2:45 AM CDT
- In force
- 36 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Greene County, IL, Macoupin County, IL
The radar
The St Louis radar (KLSX), 92 km from the middle of the area, began a volume at 07:11 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.
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 27, 1:32 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 7.2 hours before the alert went out and 157 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
- 611 J/kg
- Mixed-layer CIN
- -178 J/kg
- Mixed-layer LCL
- 767 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
696 WUUS53 KLSX 270709 SVRLSX ILC061-117-270745- /O.NEW.KLSX.SV.W.0417.110627T0709Z-110627T0745Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 209 AM CDT MON JUN 27 2011 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... GREENE COUNTY IN SOUTHWEST ILLINOIS... NORTHWESTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS... * UNTIL 245 AM CDT * AT 205 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 9 MILES SOUTHEAST OF PITTSFIELD TO 7 MILES NORTH OF HARDIN...AND MOVING EAST AT 50 MPH. * LOCATIONS IMPACTED INCLUDE... WHITE HALL...CARROLLTON...ROODHOUSE...GREENFIELD...ATHENSVILLE... PALMYRA...ELDRED...HAYPRESS...HILLVIEW...WALKERSVILLE... PATTERSON...BELLTOWN...BERDAN...BARROW...WRIGHTS...ROCKBRIDGE... SCOTTVILLE...CHESTERFIELD...HETTICK AND MODESTO. PRECAUTIONARY/PREPAREDNESS ACTIONS... THESE STORMS HAVE EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS 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. THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS NORTHEAST MISSOURI. THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 3952 8985 3925 8998 3928 9060 3953 9056 TIME...MOT...LOC 0709Z 276DEG 41KT 3953 9062 3925 9061 WIND...HAIL 70MPH <.75IN $$ TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 8:34 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 41 min |
| Jun 26, 9:09 PM CDT | River Flood Warning | LSX | Adams | 4 days |
| Jun 26, 9:09 PM CDT | River Flood Warning | LSX | Adams | 5 days |
| Jun 26, 9:16 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 59 min |
| Jun 26, 9:45 PM CDT | River Flood Warning | LSX | Clinton | 9 days |
| Jun 26, 10:09 PM CDT | Severe Thunderstorm Warning | LSX | Brown | 36 min |
| Jun 26, 10:11 PM CDT | Flash Flood Warning | LSX | Adams, Brown | 11 hr |
| Jun 27, 12:26 AM CDT | Severe Thunderstorm Warning | LSX | Adams | 49 min |
| Jun 27, 1:08 AM CDT | Tornado Warning | LSX | Adams, Calhoun, Pike | 37 min |
| Jun 27, 1:13 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 62 min |
| Jun 27, 1:27 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 63 min |
| Jun 27, 1:43 AM CDT | Tornado Warning | LSX | Adams, Calhoun, Greene, Pike | 32 min |
| Jun 27, 2:04 AM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Macoupin, Madison | 41 min |
| Jun 27, 2:42 AM CDT | Severe Thunderstorm Warning | LSX | Bond, Jersey, Macoupin, Madison, Monroe, Montgomery and 1 more | 48 min |
| Jun 27, 3:01 AM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph | 29 min |
| Jun 27, 8:25 AM CDT | River Flood Warning | LSX | Adams | 4 days |
| Jun 27, 8:57 AM CDT | Areal Flood Warning | LSX | Adams, Brown | 12 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.