Alert archive / Illinois / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 39
The Storm Prediction Center issued this severe thunderstorm watch at Mar 1, 2007, 12:16 AM CST for 17 counties in Illinois; 13 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 1, 2007, 12:16 AM CST (06:16 UTC)
- Expired
- Mar 1, 2007, 6:00 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 50 kt
All 30 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Greene County, IL, Jersey County, IL, Logan County, IL, Macoupin County, IL, Mason County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 110 km from the middle of the area, began a volume at 06:16 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 10%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 40%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 2:05 AM CST | Severe Thunderstorm Warning | LSX | Adams | 55 min |
| Mar 1, 2:06 AM CST | Severe Thunderstorm Warning | LSX | Adams | 54 min |
| Mar 1, 2:10 AM CST | Tornado Warning | LSX | Ralls | 27 min |
| Mar 1, 2:22 AM CST | Tornado Warning | LSX | Marion | 23 min |
| Mar 1, 2:55 AM CST | Severe Thunderstorm Warning | ILX | Schuyler | 50 min |
| Mar 1, 3:57 AM CST | Severe Thunderstorm Warning | LSX | Boone, Callaway, Cole, Moniteau | 48 min |
| Mar 1, 4:38 AM CST | Severe Thunderstorm Warning | LSX | Callaway | 52 min |
| Mar 1, 5:05 AM CST | Severe Thunderstorm Warning | LSX | Montgomery | 40 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
Lincoln, IL (KILX), launched 00:00Z, 6.3 hours before the alert went out and 222 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1214 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 600 m²/s²
- 0-3 km storm-relative helicity
- 665 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 010608
SEL9
SPC WW 010608
ILZ000-MOZ000-011200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 39
NWS STORM PREDICTION CENTER NORMAN OK
1210 AM CST THU MAR 1 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WEST CENTRAL ILLINOIS
NORTHEAST MISSOURI
EFFECTIVE THIS THURSDAY MORNING FROM 1210 AM UNTIL 600 AM CST.
HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST
NORTHEAST OF QUINCY ILLINOIS TO 50 MILES WEST OF ALTON ILLINOIS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 36...WW 37...WW 38...
DISCUSSION...LARGELY ELEVATED CONVECTION SHOULD SPREAD ENEWD FROM
CENTRAL INTO NE MO AND EVENTUALLY W CENTRAL IL THE NEXT SEVERAL
HOURS. MUCH OF THE CONVECTION WILL BE CONFINED TO N OF THE SURFACE
WARM FRONT...WHERE INCREASING WAA AND DESTABILIZATION JUST ABOVE THE
GROUND WILL SUPPORT A CONTINUATION OF THE ELEVATED THUNDERSTORMS
OVERNIGHT. THE MORE INTENSE STORMS...WHICH COULD BE
SUPERCELLS...WILL BE CAPABLE OF PRODUCING LARGE HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION
VECTOR 24035.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 10:30 PM CST | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Hancock, Henderson and 5 more | 90 min |
| Feb 28, 11:48 PM CST | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 5 more | 57 min |
| Mar 1, 12:12 AM CST | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Massac, Pope, Pulaski and 2 more | 2 hr |
| Mar 1, 1:05 AM CST | Severe Thunderstorm Watch | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 7 hr |
| Mar 1, 2:28 AM CST | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Christian, Greene and 11 more | 92 min |
| Mar 1, 3:35 AM CST | Mesoscale Discussion | SPC | Clinton, Jackson, Monroe, Perry, Randolph, Saint Clair and 1 more | 55 min |
| Mar 1, 3:58 AM CST | Tornado Watch | SPC | Alexander, Bond, Clinton, Fayette, Franklin, Jackson and 10 more | 8 hr |
| Mar 1, 4:18 AM CST | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Saline | 117 min |
| Mar 1, 8:40 AM CST | Tornado Watch | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 27 more | 9 hr |
| Mar 1, 10:24 AM CST | Mesoscale Discussion | SPC | Brown, Bureau, Cass, Cook, DeKalb, DeWitt and 28 more | 96 min |
| Mar 1, 11:25 AM CST | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more | 6 hr |
| Mar 1, 12:48 PM CST | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 28 more | 117 min |
| Mar 1, 1:47 PM CST | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more | 88 min |
| Feb 28, 6:11 PM CST | Mesoscale Discussion | SPC | Buchanan, Caldwell, Carroll, Clay, Clinton, Daviess and 10 more | 94 min |
| Feb 28, 6:37 PM CST | Severe Thunderstorm Watch | SPC | Adair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 16 more | 7 hr |
| Feb 28, 6:50 PM CST | Mesoscale Discussion | SPC | Barton, Bates, Cass, Cedar, Dade, Henry and 7 more | 85 min |
| Feb 28, 7:10 PM CST | Tornado Watch | SPC | Bates, Benton, Cass, Cedar, Cooper, Henry and 6 more | 7 hr |
| Feb 28, 9:48 PM CST | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Camden, Cass and 17 more | 87 min |
| Mar 1, 1:32 AM CST | Tornado Watch | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 18 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2007Severe Thunderstorm Watches in Missouri, 2007Every severe thunderstorm 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.