Alert archive / Iowa / Tornado Watches in 2001

Tornado Watch 351

June 1, 200112 counties in Illinois; 28 counties in Iowa

The Storm Prediction Center issued this tornado watch at Jun 1, 2001, 5:30 PM CDT for 12 counties in Illinois; 28 counties in Iowa. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jun 1, 2001, 5:30 PM CDT (22:30 UTC)
Expired: Jun 1, 2001, 9:00 PM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 40 counties

Appanoose County, IA, Benton County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Mercer County, IL, Peoria County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 102 km from the middle of the area, began a volume at 22:33 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 1, 5:51 PM CDT	Tornado Warning	DVN	Dubuque, Jones	24 min
Jun 1, 6:13 PM CDT	Tornado Warning	DVN	Dubuque, Jones	47 min
Jun 1, 6:20 PM CDT	Severe Thunderstorm Warning	DVN	Mercer, Rock Island	40 min
Jun 1, 6:24 PM CDT	Tornado Warning	DVN	Jackson	51 min
Jun 1, 6:31 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, McDonough, Warren	44 min
Jun 1, 6:47 PM CDT	Severe Thunderstorm Warning	DVN	Henry	58 min
Jun 1, 6:59 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess	46 min
Jun 1, 7:43 PM CDT	Severe Thunderstorm Warning	DVN	Carroll	32 min

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 109 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: 536 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: -77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 012229
SEL1  

SEL1  
MKC WW 012225
IAZ000-ILZ000-020200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 351
STORM PREDICTION CENTER NORMAN OK
525 PM CDT FRI JUN 1 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   EASTERN IOWA                               
   NORTHWEST ILLINOIS                           

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 530 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 45 MILES WEST NORTHWEST OF OTTUMWA IOWA TO 45
MILES EAST NORTHEAST OF MOLINE ILLINOIS.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 344.  WATCH NUMBER 344 WILL NOT BE IN EFFECT AFTER 530 PM
CDT.  CONTINUE...WW 345...WW 346...WW 347...WW 348...WW 349...WW
350...

DISCUSSION...TORNADIC SUPERCELLS EAST OF ALO WILL CONTINUE TO TRACK
EASTWARD TOWARD NORTHWEST IL DURING THE NEXT FEW HOURS.  DECREASING
INSTABILITY FARTHER EAST...COUPLED WITH LOSS OF DAYTIME HEATING
SHOULD SLOWLY WEAKEN STORMS AFTER 8PM.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 29040.


...HART

;421,0931 423,0894 404,0894 402,0931;

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 1, 3:30 PM CDT	Tornado Watch	SPC	Hancock	6 hr
Jun 1, 1:30 PM CDT	Tornado Watch	SPC	Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 51 more	6 hr
Jun 1, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills	5 hr

Nearby

Tornado Watches in Iowa, 2001 Tornado Watches in Illinois, 2001 Every tornado 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.