Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 33, NWS Quad Cities, IA

May 28, 1998Buchanan County, Delaware County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 28, 1998, 6:37 PM CDT for Buchanan County, Delaware County, Iowa. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 28, 1998, 6:37 PM CDT (23:37 UTC)
Expired
May 28, 1998, 7:25 PM CDT
In force
48 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Buchanan County, IA, Delaware County, IA

The watch it was issued in

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

IssuedProductOfficeLasted
May 28, 3:00 PM CDTSevere Thunderstorm WatchSPC5 hr
May 28, 4:00 PM CDTTornado WatchSPC5 hr
May 28, 6:30 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 131 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 12:00Z on 1998-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 530 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 12:00Z on 1998-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 173 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
530 J/kg
Mixed-layer CIN
-213 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
173 m²/s²
0-3 km storm-relative helicity
197 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

078 
WFUS1 KMLI 282338 RRA
TORMLI
IAC019-055-290025-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
637 PM CDT THU MAY 28 1998

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN BUCHANAN COUNTY IN NORTHEASTERN IOWA
  WESTERN DELAWARE COUNTY IN NORTHEASTERN IOWA

* UNTIL 725 PM CDT

* AT 636 PM CDT... DOPPLER RADAR INDICATED A DEVELOPING TORNADO 34
  MILES EAST OF WATERLOO OR 1 MILE WEST OF LAMONT MOVING NORTHEAST
  AT 10 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  LAMONT                                     AROUND 640 PM CDT
  BACKBONE STATE PARK                        AROUND 705 PM CDT

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

HELGESON

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 5:38 PM CDTSevere Thunderstorm WarningDVNBuchanan62 min
May 28, 6:02 PM CDTSevere Thunderstorm WarningDVNBuchanan, Delaware63 min
May 28, 6:32 PM CDTFlash Flood WarningDVNBuchanan3 hr
May 28, 6:45 PM CDTSevere Thunderstorm WarningDVNBenton65 min
May 28, 6:56 PM CDTSevere Thunderstorm WarningDVNLinn64 min

Nearby

Tornado Warnings in Iowa, 1998Every tornado warning in 1998Tornadoes 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; the sounding from the Mesonet's radiosonde archive.