Alert archive / Iowa / Tornado Warnings in 2001

Tornado Warning 1, NWS Quad Cities, IA

April 8, 2001Benton County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 8, 2001, 10:20 PM CDT for Benton County, Iowa. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Apr 8, 2001, 10:20 PM CDT (03:20 UTC)
Expired: Apr 8, 2001, 11:00 PM CDT
In force: 40 min
Issued by: NWS Quad Cities, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Benton County, IA

The radar

The Des Moines radar (KDMX), 138 km from the middle of the area, began a volume at 03:22 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 8, 7:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 3.3 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: 455 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1962 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 090321
TORMLI
IAC011-090400-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1020 PM CDT SUN APR 8 2001

THE NATIONAL WEATHER SERVICE IN QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN BENTON COUNTY IN EAST CENTRAL IOWA

* UNTIL 1100 PM CDT

* AT 1018 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A DEVELOPING TORNADO 4 MILES NORTHWEST OF 
  GARRISON...OR 6 MILES EAST OF DYSART...MOVING EAST NORTHEAST AT 
  30 MPH. 

* THE TORNADO IS EXPECTED TO BE NEAR...
   MOUNT AUBURN BY 1030 PM CDT.
   
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. SEEK
SHELTER ON THE LOWES=T FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR
ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND
ALWAYS STAY AWAY FROM WINDOWS.

LAT...LON 4220 9231 4210 9222 4221 9198 4230 9209

MCCLURE

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 8, 8:26 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	49 min
Apr 8, 9:30 PM CDT	Severe Thunderstorm Warning	DVN	Benton	45 min
Apr 8, 10:06 PM CDT	Severe Thunderstorm Warning	DVN	Linn	24 min
Apr 8, 10:40 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	50 min
Apr 9, 1:37 AM CDT	Severe Thunderstorm Warning	DVN	Washington	38 min
Apr 9, 8:29 AM CDT	Severe Thunderstorm Warning	DVN	Cedar	46 min
Apr 9, 8:54 AM CDT	Severe Thunderstorm Warning	DVN	Scott	66 min

Nearby

Tornado Warnings in Iowa, 2001 Every tornado warning in 2001 Tornadoes 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.