Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 52, NWS Quad Cities, IA

June 29, 1998Henry County, Louisa County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 29, 1998, 3:07 PM CDT for Henry County, Louisa County, Iowa. It was in force for 63 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 29, 1998, 3:07 PM CDT (20:07 UTC)
Expired: Jun 29, 1998, 4:10 PM CDT
In force: 63 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

Counties Henry County, IA, Louisa County, IA

The radar

The Quad Cities radar (KDVN), 89 km from the middle of the area, began a volume at 20:07 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
Jun 29, 3:07 PM CDT	Thunderstorm Wind 52	Countywide, IA
Jun 29, 3:07 PM CDT	Thunderstorm Wind 70	Countywide, IA
Jun 29, 3:44 PM CDT	Thunderstorm Wind 70	Wapello, IA

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
Jun 29, 1:00 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.1 hours before the alert went out and 95 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: 917 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

458 
WFUS1 KMLI 292009 RRA
TORMLI
IAC031-087-115-139-177-292110-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
307 PM CDT MON JUN 29 1998

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* TORNADO WARNING FOR...
  CEDAR COUNTY IN EAST CENTRAL IOWA
  HENRY COUNTY IOWA IN SOUTHEASTERN IOWA
  LOUISA COUNTY IN SOUTHEASTERN IOWA
  MUSCATINE COUNTY IN EAST CENTRAL IOWA
  VAN BUREN COUNTY IN SOUTHEASTERN IOWA

* UNTIL 410 PM CDT

* AT 308 PM CDT... DOPPLER RADAR AND SPOTTER REPORTS INDICATED A
  DEVELOPING TORNADO 24 MILES WEST OF MUSCATINE OR 7 MILES WEST OF
  COLUMBUS JCT MOVING EAST AT 35 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  WINFIELD                                   AROUND 315 PM CDT
  CONESVILLE                                 AROUND 320 PM CDT
  COLUMBUS JCT                               AROUND 320 PM CDT
  WAPELLO                                    AROUND 335 PM CDT
  MUSCATINE                                  AROUND 345 PM CDT

GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

BERG


&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 1:53 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	62 min
Jun 29, 2:11 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk	64 min
Jun 29, 2:24 PM CDT	Tornado Warning	DVN	Benton, Iowa	36 min
Jun 29, 2:30 PM CDT	Severe Thunderstorm Warning	DVN	Johnson, Linn	65 min
Jun 29, 2:42 PM CDT	Tornado Warning	DVN	Keokuk	33 min
Jun 29, 2:46 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Washington	64 min
Jun 29, 2:53 PM CDT	Tornado Warning	DVN	Johnson	62 min
Jun 29, 2:55 PM CDT	Tornado Warning	DVN	Washington	65 min
Jun 29, 3:07 PM CDT	Tornado Warning	DVN	Cedar, Muscatine	63 min
Jun 29, 3:07 PM CDT	Tornado Warning	DVN	Van Buren	63 min
Jun 29, 3:22 PM CDT	Tornado Warning	DVN	Des Moines, Lee	63 min
Jun 29, 3:26 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	64 min
Jun 29, 6:03 PM CDT	Tornado Warning	DVN	Lee	62 min

Nearby

Tornado Warnings in Iowa, 1998 Every tornado warning in 1998 Tornadoes in 1998

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.