Alert archive / Iowa / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 452

June 18, 20014 counties in Illinois; 26 counties in Iowa; 12 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2001, 11:30 PM CDT for 4 counties in Illinois; 26 counties in Iowa; 12 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 18, 2001, 11:30 PM CDT (04:30 UTC)
Expired
Jun 19, 2001, 5:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 42 counties

Appanoose County, IA, Benton County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Carroll County, IL, Jo Daviess County, IL, Rock Island County, IL, Stephenson County, IL, Columbia County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Washington County, WI

The radar

The Quad Cities radar (KDVN), 78 km from the middle of the area, began a volume at 04:33 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.5 hours before the alert went out and 84 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 2001-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 414 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 2001-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.193958Sfc1 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
414 J/kg
Mixed-layer CIN
-251 J/kg
Mixed-layer LCL
2326 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
135 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.

IssuedProductOfficeCountiesLasted
Jun 18, 8:45 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Allamakee, Audubon, Benton, Black Hawk and 46 more5 hr
Jun 18, 7:45 PM CDTTornado WatchSPCBuffalo, Chippewa, Clark, Dunn, Eau Claire, Jackson and 13 more5 hr
Jun 18, 9:00 PM CDTTornado WatchSPCAshland, Barron, Bayfield, Douglas, Forest, Iron and 6 more5 hr

Nearby

Severe Thunderstorm Watches in Iowa, 2001Severe Thunderstorm Watches in Wisconsin, 2001Severe Thunderstorm Watches in Illinois, 2001Every 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; radar from the NEXRAD Level II archive.