Alert archive / Illinois / Tornado Watches in 2006
Tornado Watch 66
The Storm Prediction Center issued this tornado watch at Mar 11, 2006, 9:55 PM CST for 7 counties in Illinois. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 11, 2006, 9:55 PM CST (03:55 UTC)
- Expired
- Mar 12, 2006, 1:14 AM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
Counties Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jefferson County, IL, Perry County, IL, Wayne County, IL, Williamson County, IL
The radar
The Evansville,IN radar (KVWX), 114 km from the middle of the area, began a volume at 03:54 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.
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 10:00 PM CST | Tornado Warning | PAH | Perry | 60 min |
| Mar 11, 10:31 PM CST | Tornado Warning | PAH | Jefferson | 59 min |
| Mar 11, 10:45 PM CST | Flash Flood Warning | PAH | Perry | 2 hr |
| Mar 11, 10:53 PM CST | Tornado Warning | PAH | Perry | 37 min |
| Mar 11, 11:12 PM CST | Tornado Warning | PAH | Hamilton, Wayne | 48 min |
| Mar 11, 11:19 PM CST | Flash Flood Warning | PAH | Jefferson, Wayne | 3 hr |
| Mar 11, 11:23 PM CST | Tornado Warning | PAH | Perry | 67 min |
| Mar 11, 11:26 PM CST | Tornado Warning | PAH | Jefferson | 64 min |
| Mar 11, 11:53 PM CST | Tornado Warning | PAH | Wayne | 37 min |
| Mar 12, 12:27 AM CST | Severe Thunderstorm Warning | PAH | Jefferson, Wayne | 63 min |
| Mar 12, 12:43 AM CST | Flash Flood Warning | PAH | Edwards, Jefferson, Perry, Wabash, Wayne | 6 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.9 hours before the alert went out and 221 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
- 789 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 708 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 120352
SEL6
SPC WW 120352
ILZ000-121000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 66
NWS STORM PREDICTION CENTER NORMAN OK
955 PM CST SAT MAR 11 2006
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN ILLINOIS
EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 955 PM UNTIL
400 AM CST.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES NORTH NORTHEAST OF MOUNT
VERNON ILLINOIS TO 15 MILES SOUTH SOUTHEAST OF CARBONDALE
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 63...WW 64...WW 65...
DISCUSSION...CLUSTER OF SUPERCELL THUNDERSTORMS WILL CONTINUE TO
TRACK EASTWARD INTO PARTS OF SOUTHERN IL OVER THE NEXT FEW
HOURS...POSING A CONTINUED THREAT OF LARGE HAIL AND TORNADOES.
ACTIVITY MAY SLOWLY WEAKEN AFTER MIDNIGHT AS AIR MASS STABILIZES AND
STORMS MOVE EAST OF PRIMARY LOW LEVEL THETAE AXIS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 25035.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 11, 6:39 PM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clinton, DeWitt and 34 more | 66 min |
| Mar 11, 6:49 PM CST | Tornado Watch | SPC | Bond, Clinton, Fayette, Madison, Marion, Monroe and 3 more | 7 hr |
| Mar 11, 8:06 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Coles and 21 more | 84 min |
| Mar 11, 9:11 PM CST | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Edgar and 18 more | 94 min |
| Mar 11, 10:50 PM CST | Mesoscale Discussion | SPC | Wabash | 55 min |
| Mar 11, 11:10 PM CST | Tornado Watch | SPC | Edwards, Wabash, White | 2 hr |
| Mar 11, 11:13 PM CST | Mesoscale Discussion | SPC | Franklin, Jackson, Jefferson, Monroe, Perry, Randolph and 4 more | 92 min |
| Mar 12, 1:07 AM CST | Tornado Watch | SPC | Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more | 7 hr |
| Mar 12, 3:39 AM CST | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 16 more | 96 min |
| Mar 12, 10:02 AM CST | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Pike | 110 min |
| Mar 12, 11:17 AM CST | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Champaign, Christian and 28 more | 88 min |
| Mar 12, 11:49 AM CST | Tornado Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 30 more | 10 hr |
| Mar 12, 1:02 PM CST | Mesoscale Discussion | SPC | Edwards, Gallatin, Hamilton, Hardin, Johnson, Pope and 5 more | 88 min |
| Mar 12, 2:33 PM CST | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, Grundy, Henderson, Henry and 13 more | 87 min |
| Mar 12, 3:02 PM CST | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 6 more | 88 min |
| Mar 12, 4:22 PM CST | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, DuPage, Grundy, Henderson and 18 more | 53 min |
| Mar 12, 4:49 PM CST | Tornado Watch | SPC | Bureau, Ford, Grundy, Henderson, Henry, Iroquois and 11 more | 5 hr |
| Mar 12, 5:06 PM CST | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 26 more | 84 min |
Nearby
Tornado Watches in Illinois, 2006Every tornado watch in 2006
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.