Alert archive / Iowa / Tornado Warnings in 1998

Tornado Warning 36, NWS Quad Cities, IA

May 31, 1998Delaware County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 31, 1998, 1:45 AM CDT for Delaware County, Iowa. It was in force for 50 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 31, 1998, 1:45 AM CDT (06:45 UTC)
Expired
May 31, 1998, 2:35 AM CDT
In force
50 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County 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 31, 12:00 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.8 hours before the alert went out and 119 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 00:00Z on 1998-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1779 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 00:00Z on 1998-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 221 square meters per square second.19395878Sfc1 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
1779 J/kg
Mixed-layer CIN
-287 J/kg
Mixed-layer LCL
1354 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
221 m²/s²
0-3 km storm-relative helicity
565 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

544 
WFUS1 KMLI 310646 RRA
TORMLI
IAC055-310735-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
145 AM CDT SUN MAY 31 1998

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN DELAWARE COUNTY IN NORTHEASTERN IOWA

* UNTIL 235 AM CDT

* AT 144 AM CDT... DOPPLER RADAR AND SPOTTER REPORTS INDICATED A
  TORNADO 41 MILES EAST OF WATERLOO OR 8 MILES WEST OF EDGEWOOD
  MOVING EAST AT 45 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  EDGEWOOD                                   AROUND 150 AM CDT
  GREELEY                                    AROUND 155 AM CDT
  ONEIDA                                     AROUND 155 AM CDT
  COLESBURG                                  AROUND 205 AM CDT
  PETERSBURG                                 AROUND 205 AM 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 31, 1:29 AM CDTSevere Thunderstorm WarningDVNBuchanan51 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.