Alert archive / Illinois / Tornado Warnings in 1998

Tornado Warning 18, NWS Lincoln, IL

April 7, 1998Mason County, Illinois

NWS Lincoln, IL issued this tornado warning at Apr 7, 1998, 6:13 PM CDT for Mason County, Illinois. It was in force for 62 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 7, 1998, 6:13 PM CDT (23:13 UTC)
Expired
Apr 7, 1998, 7:15 PM CDT
In force
62 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Mason County, IL

The radar

The Lincoln radar (KILX), 50 km from the middle of the area, began a volume at 23:12 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 7, 2:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.2 hours before the alert went out and 112 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, Lincoln, IL at 12:00Z on 1998-04-07Temperature 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, Lincoln, IL at 12:00Z on 1998-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 square meters per square second.1939Sfc1 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
1568 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
51 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.

344 
WFUS1 KSPI 072315 RRA
TORSPI
ILC125-143-179-080015-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
613 PM CDT TUE APR 7 1998

* TORNADO WARNING FOR
  NORTHERN MASON COUNTY IN CENTRAL ILLINOIS
  PEORIA COUNTY IN CENTRAL ILLINOIS
  TAZEWELL COUNTY IN CENTRAL ILLINOIS

* UNTIL 715 PM CDT

* SOME LOCATIONS AFFECTED
  MANITO
  GOOFY RIDGE
  GLASFORD
  PEKIN
  HAVANA

* AT 610 PM CDT STORM SPOTTERS REPORTED A TORNADO NORTH OF HAVANA...
  JUST EAST OF THE ILLINOIS RIVER...MOVING NORTHEAST AT 30 MPH.

TAKE COVER IMMEDIATELY IN A BASEMENT OR INTERIOR ROOM ON THE LOWEST
FLOOR. ABANDON MOBILE HOMES AND VEHICLES FOR SAFER SHELTER.

FRIEDERS


&

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 2:59 PM CDTSevere Thunderstorm WarningILXFulton, Peoria61 min
Apr 7, 3:27 PM CDTTornado WarningILXFulton, Peoria48 min
Apr 7, 4:00 PM CDTTornado WarningILXCass, Mason, Schuyler45 min
Apr 7, 4:07 PM CDTTornado WarningILXPeoria53 min
Apr 7, 4:13 PM CDTTornado WarningILXMorgan, Sangamon47 min
Apr 7, 4:36 PM CDTTornado WarningILXMason54 min
Apr 7, 4:51 PM CDTTornado WarningILXFulton, Schuyler69 min
Apr 7, 4:57 PM CDTTornado WarningILXLogan, Sangamon63 min
Apr 7, 5:05 PM CDTTornado WarningILXChristian, Sangamon55 min
Apr 7, 5:10 PM CDTTornado WarningILXTazewell65 min
Apr 7, 5:22 PM CDTTornado WarningILXMason53 min
Apr 7, 5:51 PM CDTTornado WarningILXFulton69 min
Apr 7, 5:54 PM CDTTornado WarningILXLogan66 min
Apr 7, 5:57 PM CDTTornado WarningILXChristian63 min
Apr 7, 6:06 PM CDTTornado WarningILXMacon, Shelby69 min
Apr 7, 6:13 PM CDTTornado WarningILXPeoria, Tazewell62 min
Apr 7, 6:25 PM CDTTornado WarningILXMenard50 min
Apr 7, 6:28 PM CDTTornado WarningILXDeWitt, McLean62 min
Apr 7, 6:33 PM CDTTornado WarningILXMoultrie42 min
Apr 7, 6:44 PM CDTTornado WarningILXKnox, Stark46 min
Apr 7, 6:55 PM CDTTornado WarningILXPiatt50 min
Apr 7, 6:57 PM CDTTornado WarningILXLogan63 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.