Alert archive / Illinois / Tornado Watches in 2007

Tornado Watch 363

June 7, 20074 states

The Storm Prediction Center issued this tornado watch at Jun 7, 2007, 10:14 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 7, 2007, 10:14 PM CDT (03:14 UTC)
Expired
Jun 8, 2007, 5:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
70 kt
All 89 counties

Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Allegan County, MI, Berrien County, MI, Clare County, MI, Isabella County, MI, Kent County, MI, Lake County, MI, Mason County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Van Buren County, MI, Dodge County, WI, Green County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Chicago radar (KLOT), 61 km from the middle of the area, began a volume at 03:14 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
90%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 7, 10:31 PM CDTSevere Thunderstorm WarningMKXWalworth30 min
Jun 7, 10:40 PM CDTSevere Thunderstorm WarningDVNWhiteside40 min
Jun 7, 10:45 PM CDTSevere Thunderstorm WarningLOTLee, Ogle60 min
Jun 7, 10:45 PM CDTSevere Thunderstorm WarningMKXRacine34 min
Jun 7, 10:51 PM CDTSevere Thunderstorm WarningMKXMilwaukee, Waukesha39 min
Jun 7, 11:01 PM CDTSevere Thunderstorm WarningILXCass, Fulton, Mason, Schuyler22 min
Jun 7, 11:20 PM CDTSevere Thunderstorm WarningGRRMason25 min
Jun 7, 11:30 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb30 min
Jun 7, 11:42 PM CDTSevere Thunderstorm WarningGRRMason48 min
Jun 8, 12:01 AM CDTSevere Thunderstorm WarningGRRLake29 min
Jun 8, 12:03 AM CDTSevere Thunderstorm WarningGRRLake, Mason, Newaygo, Oceana27 min
Jun 8, 12:13 AM CDTSevere Thunderstorm WarningILXCass, Mason, Morgan, Schuyler, Scott32 min
Jun 8, 12:26 AM CDTSevere Thunderstorm WarningGRRLake, Mason, Oceana34 min
Jun 8, 2:19 AM CDTFlash Flood WarningLOTLake3 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

Davenport, (KDVN), launched 00:00Z, 3.2 hours before the alert went out and 140 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2007-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1138 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2007-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1138 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
1462 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 7, 7:54 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 9 more2 hr
Jun 7, 8:31 PM CDTTornado WatchSPCAdams, Brown, Fulton, Knox, Peoria, Pike and 2 more7 hr
Jun 7, 9:23 PM CDTMesoscale DiscussionSPCBoone, Carroll, Jo Daviess, Lee, McHenry, Mercer and 5 more97 min
Jun 7, 9:48 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 13 more87 min
Jun 7, 11:12 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Madison, Monroe and 3 more93 min
Jun 7, 11:26 PM CDTTornado WatchSPCBond, Calhoun, Clinton, Fayette, Greene, Jackson and 10 more8 hr
Jun 8, 6:23 AM CDTMesoscale DiscussionSPCAlexander, Johnson, Massac, Pope, Pulaski, Union and 1 more67 min
Jun 8, 8:45 AM CDTSevere Thunderstorm WatchSPCGallatin, Hardin, Massac, Pope6 hr
Jun 8, 8:30 AM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 22 more90 min
Jun 8, 10:07 AM CDTMesoscale DiscussionSPCAdams, Allen, DeKalb, Steuben53 min
Jun 8, 10:43 AM CDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, DeKalb, Huntington, Jay and 5 more7 hr
Jun 8, 11:40 AM CDTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Blackford, Brown, Clark and 28 more65 min
Jun 7, 10:54 PM CDTTornado WatchSPCAlcona, Alpena, Antrim, Arenac, Benzie, Charlevoix and 19 more5 hr
Jun 8, 2:59 AM CDTMesoscale DiscussionSPCAllegan, Alpena, Clare, Crawford, Gladwin, Isabella and 13 more61 min

Nearby

Tornado Watches in Illinois, 2007Tornado Watches in Michigan, 2007Tornado Watches in Wisconsin, 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.