Alert archive / Illinois / Tornado Watches in 2004
Tornado Watch 444
The Storm Prediction Center issued this tornado watch at Jun 11, 2004, 11:00 PM CDT for 21 counties in Illinois. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2004, 11:00 PM CDT (04:00 UTC)
- Expired
- Jun 12, 2004, 4:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Ogle County, IL, Putnam County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 86 km from the middle of the area, began a volume at 03:59 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
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 11:09 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, Will | 41 min |
| Jun 11, 11:25 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Grundy, Kane, Kendall, Will | 4 hr |
| Jun 12, 12:10 AM CDT | Flash Flood Warning | DVN | Stephenson | 5 hr |
| Jun 12, 1:36 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 24 min |
| Jun 12, 2:07 AM CDT | Flash Flood Warning | LOT | Iroquois | 4 hr |
| Jun 12, 2:31 AM CDT | Flash Flood Warning | LOT | Ogle | 3 hr |
| Jun 12, 2:49 AM CDT | Flash Flood Warning | LOT | LaSalle | 3 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, 4.0 hours before the alert went out and 174 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
- 3388 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1075 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 120358
SEL4
SPC WW 120400
ILZ000-LMZ000-120900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 444
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM CDT FRI JUN 11 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN ILLINOIS
LAKE MICHIGAN
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1100 PM
UNTIL 400 AM CDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 65 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 85 MILES WEST NORTHWEST OF MARSEILLES
ILLINOIS TO 65 MILES EAST SOUTHEAST OF MARSEILLES ILLINOIS.
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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 440. WATCH NUMBER 440 WILL NOT BE IN EFFECT AFTER
1100 PM CDT. CONTINUE...WW 439...WW 441...WW 443...
DISCUSSION...SCATTERED THUNDERSTORMS/POSSIBLE SUPERCELLS EXPECTED TO
PERSIST INVOF WARM/STATIONARY FRONT TONIGHT...WHERE MOIST INFLOW/LOW
LCLS AND ENHANCED LOW LEVEL SHEAR WILL REMAIN FAVORABLE FOR POSSIBLE
TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 55 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 27030.
...CORFIDI
423,0901 414,0873 401,0873 410,0901SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:35 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Mercer | 4 hr |
| Jun 11, 10:04 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Grundy, Jo Daviess and 10 more | 56 min |
| Jun 12, 1:48 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more | 87 min |
| Jun 12, 3:08 AM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Grundy, Iroquois, Kane and 7 more | 97 min |
| Jun 12, 10:48 AM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Massac, Pope | 2 hr |
| Jun 12, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Mercer, Rock Island, Warren | 5 hr |
| Jun 12, 3:51 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 11 more | 84 min |
| Jun 12, 4:15 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 5 hr |
| Jun 12, 6:08 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 37 min |
Nearby
Tornado Watches in Illinois, 2004Every tornado watch in 2004
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.