Alert archive / Illinois / Tornado Watches in 2007
Tornado Watch 66
The Storm Prediction Center issued this tornado watch at Mar 22, 2007, 2:59 AM CDT for 25 counties in Illinois; 24 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 22, 2007, 2:59 AM CDT (07:59 UTC)
- Expired
- Mar 22, 2007, 9:57 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 70 kt
All 49 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Greene County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Chariton County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Saline County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 111 km from the middle of the area, began a volume at 08:00 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 3:10 AM CDT | Tornado Warning | EAX | Carroll, Chariton | 35 min |
| Mar 22, 3:22 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 26 min |
| Mar 22, 3:31 AM CDT | Tornado Warning | EAX | Chariton | 29 min |
| Mar 22, 3:34 AM CDT | Severe Thunderstorm Warning | ILX | Schuyler | 21 min |
| Mar 22, 4:18 AM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 27 min |
| Mar 22, 4:22 AM CDT | Severe Thunderstorm Warning | LSX | Audrain, Monroe | 38 min |
| Mar 22, 4:27 AM CDT | Severe Thunderstorm Warning | ILX | Tazewell | 15 min |
| Mar 22, 4:35 AM CDT | Severe Thunderstorm Warning | ILX | McLean | 35 min |
| Mar 22, 4:43 AM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 32 min |
| Mar 22, 4:59 AM CDT | Severe Thunderstorm Warning | ILX | Macon | 31 min |
| Mar 22, 5:02 AM CDT | Severe Thunderstorm Warning | ILX | Champaign, DeWitt, McLean, Piatt | 19 min |
| Mar 22, 5:26 AM CDT | Severe Thunderstorm Warning | ILX | Christian, Coles, Douglas, Macon, Moultrie, Shelby | 64 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 8.0 hours before the alert went out and 267 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
- 730 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 1120 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 303 m²/s²
- 0-3 km storm-relative helicity
- 449 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 4.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 220759
SEL6
SPC WW 220759
ILZ000-MOZ000-221500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 66
NWS STORM PREDICTION CENTER NORMAN OK
300 AM CDT THU MAR 22 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL ILLINOIS
PARTS OF EASTERN AND CENTRAL MISSOURI
EFFECTIVE THIS THURSDAY MORNING FROM 300 AM UNTIL 1000 AM CDT.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF COLUMBIA
MISSOURI TO 5 MILES EAST NORTHEAST OF DECATUR 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.
DISCUSSION...VERY STRONG SHEAR PROFILES WITH 70KT LLJ COUPLED WITH
ADVECTION OF INCREASINGLY MOIST UNSTABLE AIR MASS HAS ENHANCED
POTENTIAL FOR SUPERCELLS IN BAND OF STORMS ACROSS NRN MO. IN
ADDITION TO DAMAGING WINDS AND LARGE HAIL...TORNADOES ARE ALSO
POSSIBLE WITH THE SUPERCELLS AS THEY TRACK RAPIDLY EWD INTO CENTRAL
IL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24040.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 22, 2:02 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Greene, Hancock and 16 more | 118 min |
| Mar 22, 2:49 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 14 more | 26 min |
| Mar 22, 4:43 AM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Cumberland, Douglas, Edgar and 4 more | 62 min |
| Mar 22, 5:03 AM CDT | Severe Thunderstorm Watch | SPC | Champaign, Coles, Douglas, Edgar, Ford, Iroquois and 1 more | 4 hr |
| Mar 22, 6:13 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 20 more | 62 min |
| Mar 22, 7:08 AM CDT | Mesoscale Discussion | SPC | Clark | 67 min |
| Mar 21, 9:31 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, DeKalb, Gentry, Harrison, Holt and 2 more | 59 min |
| Mar 22, 12:52 AM CDT | Mesoscale Discussion | SPC | Adair, Buchanan, Caldwell, Carroll, Chariton, Clay and 22 more | 53 min |
Nearby
Tornado Watches in Illinois, 2007Tornado Watches in Missouri, 2007Every tornado watch in 2007
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.