Alert archive / Illinois / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 567

July 17, 200126 counties in Illinois; Union County, Kentucky; Perry County, City of Saint Louis, Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jul 17, 2001, 6:45 PM CDT for 26 counties in Illinois; Union County, Kentucky; Perry County, City of Saint Louis, Missouri. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jul 17, 2001, 6:45 PM CDT (23:45 UTC)
Expired: Jul 17, 2001, 11:00 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 29 counties

Bond County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Union County, KY, City of Saint Louis, MO, Perry County, MO

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
Jul 17, 6:46 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	44 min
Jul 17, 7:09 PM CDT	Tornado Warning	LSX	Jersey, Macoupin	36 min
Jul 17, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	Madison	40 min
Jul 17, 7:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	47 min
Jul 17, 8:17 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	58 min
Jul 17, 8:48 PM CDT	Severe Thunderstorm Warning	LSX	City of Saint Louis	27 min
Jul 17, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Washington	47 min

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.8 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 358 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1043 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 2:15 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Cass, Christian, Fulton, Greene and 24 more	5 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2001 Severe Thunderstorm Watches in Missouri, 2001 Severe Thunderstorm Watches in Kentucky, 2001 Every severe thunderstorm watch in 2001

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.