Alert archive / Illinois / Tornado Watches in 1998

Tornado Watch 173

April 7, 199830 counties in Illinois; 16 counties in Iowa; 10 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 7, 1998, 2:00 PM CDT for 30 counties in Illinois; 16 counties in Iowa; 10 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 7, 1998, 2:00 PM CDT (19:00 UTC)
Expired: Apr 7, 1998, 8:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 56 counties

Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Knox County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The radar

The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 19:01 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

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

Issued	Product	Office	Counties	Lasted
Apr 7, 2:42 PM CDT	Severe Thunderstorm Warning	EAX	Adair	43 min
Apr 7, 2:59 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Peoria	61 min
Apr 7, 3:27 PM CDT	Tornado Warning	ILX	Fulton, Peoria	48 min
Apr 7, 3:55 PM CDT	Severe Thunderstorm Warning	LSX	Adams	35 min
Apr 7, 4:00 PM CDT	Tornado Warning	ILX	Cass, Mason, Schuyler	45 min
Apr 7, 4:05 PM CDT	Severe Thunderstorm Warning	LSX	Adams	25 min
Apr 7, 4:07 PM CDT	Tornado Warning	ILX	Peoria	53 min
Apr 7, 4:13 PM CDT	Tornado Warning	ILX	Morgan, Sangamon	47 min
Apr 7, 4:20 PM CDT	Tornado Warning	LSX	Clark	25 min
Apr 7, 4:25 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	50 min
Apr 7, 4:28 PM CDT	Severe Thunderstorm Warning	DVN	Lee	47 min
Apr 7, 4:30 PM CDT	Tornado Warning	DVN	Lee	35 min
Apr 7, 4:35 PM CDT	Tornado Warning	DVN	Hancock	35 min
Apr 7, 4:36 PM CDT	Tornado Warning	ILX	Mason	54 min
Apr 7, 4:36 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	34 min
Apr 7, 4:50 PM CDT	Tornado Warning	DVN	McDonough	50 min
Apr 7, 4:50 PM CDT	Severe Thunderstorm Warning	LSX	Brown	40 min
Apr 7, 4:51 PM CDT	Tornado Warning	ILX	Fulton, Schuyler	69 min
Apr 7, 4:57 PM CDT	Tornado Warning	ILX	Logan, Sangamon	63 min
Apr 7, 5:01 PM CDT	Severe Thunderstorm Warning	DVN	Warren	49 min
Apr 7, 5:05 PM CDT	Tornado Warning	ILX	Christian, Sangamon	55 min
Apr 7, 5:05 PM CDT	Tornado Warning	DVN	Lee	35 min
Apr 7, 5:10 PM CDT	Tornado Warning	ILX	Tazewell	65 min
Apr 7, 5:22 PM CDT	Tornado Warning	ILX	Mason	53 min
Apr 7, 5:31 PM CDT	Tornado Warning	DVN	Warren	34 min
Apr 7, 5:51 PM CDT	Tornado Warning	ILX	Fulton	69 min
Apr 7, 5:54 PM CDT	Tornado Warning	ILX	Logan	66 min
Apr 7, 5:57 PM CDT	Tornado Warning	ILX	Christian	63 min
Apr 7, 6:05 PM CDT	Tornado Warning	DVN	Warren	35 min
Apr 7, 6:06 PM CDT	Tornado Warning	DVN	Mercer	49 min
Apr 7, 6:06 PM CDT	Tornado Warning	ILX	Macon, Shelby	69 min
Apr 7, 6:13 PM CDT	Tornado Warning	ILX	Peoria, Tazewell	62 min
Apr 7, 6:13 PM CDT	Tornado Warning	ILX	Mason	62 min
Apr 7, 6:25 PM CDT	Tornado Warning	ILX	Menard	50 min
Apr 7, 6:28 PM CDT	Tornado Warning	ILX	DeWitt, McLean	62 min
Apr 7, 6:33 PM CDT	Tornado Warning	ILX	Moultrie	42 min
Apr 7, 6:44 PM CDT	Tornado Warning	ILX	Knox, Stark	46 min
Apr 7, 6:55 PM CDT	Tornado Warning	ILX	Piatt	50 min
Apr 7, 6:57 PM CDT	Tornado Warning	ILX	Logan	63 min
Apr 7, 7:13 PM CDT	Tornado Warning	ILX	Peoria, Tazewell	62 min
Apr 7, 7:23 PM CDT	Tornado Warning	ILX	Woodford	67 min
Apr 7, 7:28 PM CDT	Tornado Warning	ILX	DeWitt, McLean	62 min

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 120 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1589 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 7, 4:15 PM CDT	Tornado Watch	SPC	Bond, Clark, Clay, Clinton, Coles, Crawford and 22 more	6 hr
Apr 6, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Cedar, Dade, Greene, Jasper and 5 more	6 hr

Nearby

Tornado Watches in Illinois, 1998 Tornado Watches in Iowa, 1998 Tornado Watches in Missouri, 1998 Every tornado watch in 1998

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.