Alert archive / Iowa / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 13, NWS Quad Cities, IA

April 8, 2001Buchanan County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Apr 8, 2001, 10:40 PM CDT for Buchanan County, Iowa. It was in force for 50 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Apr 8, 2001, 10:40 PM CDT (03:40 UTC)
Expired: Apr 8, 2001, 11:30 PM CDT
In force: 50 min
Issued by: NWS Quad Cities, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Buchanan County, IA

The radar

The Quad Cities radar (KDVN), 140 km from the middle of the area, began a volume at 03:43 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.

What was reported inside it

Time	Report	Where	Remark
Apr 8, 10:56 PM CDT	Hail 0.75	Quasqueton, IA	Penny sized hail on county highway W35. Reported by trained storm spotter.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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, 3.7 hours before the alert went out and 145 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 
WUUS53 KDVN 090340
SVRMLI
IAC019-090430-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1040 PM CDT SUN APR 8 2001

THE NATIONAL WEATHER SERVICE IN QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BUCHANAN COUNTY IN NORTHEAST IOWA

* UNTIL 1130 PM CDT

* AT 1038 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS 6 MILES WEST
  OF ROWLEY...OR 9 MILES SOUTH OF INDEPENDENCE...MOVING NORTHEAST AT
  40 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
   ROWLEY BY 1045 PM CDT.
   INDEPENDENCE BY 1050 PM CDT.
   WINTHROP BY 1100 PM CDT.
   AURORA BY 1110 PM CDT.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO 1 INCH IN
DIAMETER AND WINDS IN EXCESS OF 55 MPH. TAKE COVER IN A STURDY
STRUCTURE UNTIL THE STORM PASSES.

LAT...LON 4234 9207 4229 9191 4248 9162 4266 9174

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, 10:20 PM CDT	Tornado Warning	DVN	Benton	40 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

Severe Thunderstorm Warnings in Iowa, 2001 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.