Alert archive / Iowa / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 662

August 9, 200016 counties in Illinois; 29 counties in Iowa

The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2000, 1:00 AM CDT for 16 counties in Illinois; 29 counties in Iowa. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2000, 1:00 AM CDT (06:00 UTC)
Expired: Aug 9, 2000, 6:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 45 counties

Appanoose County, IA, Benton County, IA, Cedar County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Rock Island County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 119 km from the middle of the area, began a volume at 06:03 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

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

Issued	Product	Office	Counties	Lasted
Aug 9, 1:14 AM CDT	Severe Thunderstorm Warning	DVN	Iowa	46 min
Aug 9, 1:55 AM CDT	Severe Thunderstorm Warning	DVN	Iowa	50 min
Aug 9, 2:27 AM CDT	Severe Thunderstorm Warning	DMX	Poweshiek	28 min
Aug 9, 2:48 AM CDT	Severe Thunderstorm Warning	DVN	Washington	57 min
Aug 9, 2:55 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk	65 min
Aug 9, 3:25 AM CDT	Severe Thunderstorm Warning	DVN	Henry, Louisa	65 min
Aug 9, 3:52 AM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer	38 min
Aug 9, 4:15 AM CDT	Severe Thunderstorm Warning	DVN	Warren	45 min
Aug 9, 4:24 AM CDT	Severe Thunderstorm Warning	ILX	Knox	66 min
Aug 9, 4:39 AM CDT	Severe Thunderstorm Warning	ILX	Marshall	36 min
Aug 9, 4:47 AM CDT	Severe Thunderstorm Warning	ILX	Peoria	43 min

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.0 hours before the alert went out and 125 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: 1591 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	Champaign, DeWitt, Ford, Iroquois, Kankakee, LaSalle and 6 more	5 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2000 Severe Thunderstorm Watches in Illinois, 2000 Every severe thunderstorm watch in 2000

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.