Alert archive / Illinois / Tornado Warnings in 1998

Tornado Warning 35, NWS Quad Cities, IA

May 28, 1998Stephenson County, Illinois

NWS Quad Cities, IA issued this tornado warning at May 28, 1998, 8:37 PM CDT for Stephenson County, Illinois. It was in force for 33 min. 1 report 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: May 28, 1998, 8:37 PM CDT (01:37 UTC)
Expired: May 28, 1998, 9:10 PM CDT
In force: 33 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Stephenson County, IL

What was reported inside it

Time	Report	Where	Remark
May 28, 8:46 PM CDT	Tornado F0	Eleroy, IL	Brief tornado damaged and uprooted trees.

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
May 28, 6:30 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.6 hours before the alert went out and 107 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: 2333 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1689 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

775 
WFUS1 KMLI 290138 RRA
TORMLI
ILC177-290210-

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

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* TORNADO WARNING FOR...
  STEPHENSON COUNTY IN NORTH CENTRAL ILLINOIS

* UNTIL 910 PM CDT

* AT 836 PM CDT... SPOTTERS REPORTED A TORNADO 7 MILES WEST OF
  FREEPORT OR IN THE VICINITY OF ELEROY MOVING EAST AT 15 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  ELEROY                                     AROUND 838 PM CDT
  DAMASCUS                                   AROUND 845 PM CDT
  SCIOTO MILLS                               AROUND 855 PM CDT
  FREEPORT                                   AROUND 900 PM CDT
  CEDARVILLE                                 AROUND 900 PM CDT

A TORNADO IS ON THE GROUND GO TO THE BASEMENT IF A BASEMENT IS
NOT AVAILABLE...GO TO 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.

Issued	Product	Office	Counties	Lasted
May 28, 8:02 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	63 min
May 28, 8:12 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Rock Island, Whiteside	63 min
May 28, 8:23 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	62 min
May 29, 12:24 AM CDT	Severe Thunderstorm Warning	DVN	Rock Island	66 min

Nearby

Tornado Warnings in Illinois, 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.