Alert archive / Illinois / Tornado Warnings in 1998

Tornado Warning 13, NWS Quad Cities, IA

April 15, 1998Mercer County, Illinois

NWS Quad Cities, IA issued this tornado warning at Apr 15, 1998, 5:02 PM CDT for Mercer County, Illinois. 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
Apr 15, 1998, 5:02 PM CDT (22:02 UTC)
Expired
Apr 15, 1998, 5:50 PM CDT
In force
48 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Mercer County, IL

The radar

The Quad Cities radar (KDVN), 47 km from the middle of the area, began a volume at 22:04 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.

IssuedProductOfficeLasted
Apr 15, 3:15 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 50 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 1998-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1998-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 344 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
667 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
344 m²/s²
0-3 km storm-relative helicity
446 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

396 
WFUS1 KMLI 152203 RRA
TORMLI
ILC131-152250-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
502 PM CDT WED APR 15 1998

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN MERCER COUNTY IN NORTHWESTERN ILLINOIS

* UNTIL 550 PM CDT

* AT 501 PM CDT... SPOTTERS REPORTED A DEVELOPING TORNADO 19 MILES
  NORTHWEST OF GALESBURG OR 1 MILE SOUTH OF VIOLA MOVING NORTHEAST
  AT 25 MPH.

* THE TORNADO WILL BE NEAR
  VIOLA                                      AROUND 503 PM CDT
  GRIFFIN                                    AROUND 515 PM CDT
  NEW WINDSOR                                AROUND 515 PM CDT
  CABLE                                      AROUND 520 PM CDT
  SWEDONA                                    AROUND 525 PM CDT

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

JDH/EAH

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 3:36 PM CDTSevere Thunderstorm WarningDVNHenry, Whiteside49 min
Apr 15, 3:53 PM CDTTornado WarningDVNBureau, Henry, Whiteside32 min
Apr 15, 4:20 PM CDTTornado WarningDVNHenderson, Warren50 min
Apr 15, 4:25 PM CDTTornado WarningDVNBureau50 min

Nearby

Tornado Warnings in Illinois, 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; radar from the NEXRAD Level II archive.