Alert archive / Illinois / Tornado Watches in 2017
Tornado Watch 512
The Storm Prediction Center issued this tornado watch at Nov 5, 2017, 12:35 PM CST for 30 counties in Illinois; 15 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 5, 2017, 12:35 PM CST (18:35 UTC)
- Expired
- Nov 5, 2017, 7:00 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 45 counties
Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Vermilion County, IL, Washington County, IL, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The Evansville,IN radar (KVWX), 118 km from the middle of the area, began a volume at 18:35 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
- 50%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 80%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 5, 12:54 PM CST | Severe Thunderstorm Warning | ILX | Christian, Macon | 28 min |
| Nov 5, 1:44 PM CST | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin | 30 min |
| Nov 5, 1:59 PM CST | Severe Thunderstorm Warning | LSX | Saint Charles, Saint Louis, City of Saint Louis | 46 min |
| Nov 5, 2:17 PM CST | Severe Thunderstorm Warning | ILX | Champaign, Douglas, Edgar, Vermilion | 43 min |
| Nov 5, 2:24 PM CST | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Louis | 51 min |
| Nov 5, 2:27 PM CST | Severe Thunderstorm Warning | LSX | Madison, Saint Clair | 48 min |
| Nov 5, 2:49 PM CST | Severe Thunderstorm Warning | ILX | Christian, Moultrie, Shelby | 41 min |
| Nov 5, 2:55 PM CST | Severe Thunderstorm Warning | LSX | Bond, Clinton, Fayette, Madison | 50 min |
| Nov 5, 2:57 PM CST | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 48 min |
| Nov 5, 3:14 PM CST | Severe Thunderstorm Warning | LSX | Franklin, Jefferson | 46 min |
| Nov 5, 3:35 PM CST | Severe Thunderstorm Warning | LSX | Crawford, Iron, Washington | 40 min |
| Nov 5, 3:37 PM CST | Severe Thunderstorm Warning | LSX | Monroe | 41 min |
| Nov 5, 3:53 PM CST | Severe Thunderstorm Warning | LSX | Jefferson, Saint Francois, Washington | 21 min |
| Nov 5, 4:07 PM CST | Severe Thunderstorm Warning | LSX | Monroe, Randolph, Saint Clair, Washington | 38 min |
| Nov 5, 4:12 PM CST | Severe Thunderstorm Warning | LSX | Iron, Madison, Saint Francois, Washington | 12 min |
| Nov 5, 4:19 PM CST | Severe Thunderstorm Warning | ILX | Clark | 41 min |
| Nov 5, 4:42 PM CST | Severe Thunderstorm Warning | LSX | Randolph | 22 min |
| Nov 5, 5:09 PM CST | Flash Flood Warning | ILX | Clay, Jasper | 3 hr |
| Nov 5, 5:35 PM CST | Severe Thunderstorm Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 10 min |
| Nov 5, 5:36 PM CST | Tornado Warning | ILX | Crawford, Lawrence, Richland | 24 min |
| Nov 5, 5:57 PM CST | Tornado Warning | ILX | Crawford, Lawrence, Richland | 33 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 12:00Z, 6.6 hours before the alert went out and 153 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
- 1199 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 454 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 322 m²/s²
- 0-3 km storm-relative helicity
- 382 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.2
The text
As transmitted.
011
WWUS20 KWNS 051834
SEL2
SPC WW 051834
ILZ000-MOZ000-060100-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 512
NWS Storm Prediction Center Norman OK
1235 PM CST Sun Nov 5 2017
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Central Illinois
East-central Missouri
* Effective this Sunday afternoon and evening from 1235 PM until
700 PM CST.
* Primary threats include...
A few tornadoes possible
Widespread large hail likely with isolated very large hail
events to 2.5 inches in diameter possible
Scattered damaging wind gusts to 70 mph likely
SUMMARY...Thunderstorms are forming along and ahead of a cold front
sagging through the watch area. Large hail will be possible in the
strongest cells, along with some risk for a few tornadoes.
The tornado watch area is approximately along and 50 statute miles
north and south of a line from 5 miles north northeast of Terre
Haute IN to 55 miles west northwest of Farmington MO. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 511...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 25035.
...HartSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 5, 6:04 AM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Coles, Cumberland and 19 more | 2 hr |
| Nov 5, 11:09 AM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 30 more | 66 min |
| Nov 5, 2:51 PM CST | Mesoscale Discussion | SPC | Alexander, Bond, Christian, Clark, Clay, Clinton and 38 more | 114 min |
| Nov 5, 3:50 PM CST | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 6 hr |
| Nov 5, 10:48 AM CST | Mesoscale Discussion | SPC | Bartholomew, Brown, Daviess, Dearborn, Decatur, Greene and 8 more | 57 min |
| Nov 5, 11:08 AM CST | Tornado Watch | SPC | Adams, Bartholomew, Blackford, Boone, Brown, Carroll and 44 more | 7 hr |
| Nov 5, 12:36 PM CST | Mesoscale Discussion | SPC | Boone, Carroll, Clinton, Grant, Hamilton, Howard and 4 more | 54 min |
| Nov 5, 4:58 PM CST | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Clay, Crawford, Dearborn and 28 more | 62 min |
| Nov 5, 5:31 PM CST | Severe Thunderstorm Watch | SPC | Bartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 20 more | 6 hr |
Nearby
Tornado Watches in Illinois, 2017Tornado Watches in Missouri, 2017Every tornado watch in 2017
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.