Alert archive / Illinois / Tornado Warnings in 1998

Tornado Warning 28, NWS Quad Cities, IA

May 15, 1998Henry County, Illinois

NWS Quad Cities, IA issued this tornado warning at May 15, 1998, 7:57 PM CDT for Henry County, Illinois. It was in force for 33 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 15, 1998, 7:57 PM CDT (00:57 UTC)
Expired: May 15, 1998, 8:30 PM CDT
In force: 33 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Henry County, IL

The radar

The Quad Cities radar (KDVN), 47 km from the middle of the area, began a volume at 00:59 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.

Issued	Product	Office	Lasted
May 15, 5:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.0 hours before the alert went out and 186 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: 3559 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 3.7
Supercell composite: 20.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 160057 RRA
TORMLI
ILC073-160130-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
757 PM CDT FRI MAY 15 1998

THE NATIONAL WEATHER SERVICE IN QUAD CITIES IA HAS ISSUED A

* TORNADO WARNING FOR...
  HENRY COUNTY ILLINOIS IN NORTHWESTERN ILLINOIS

* UNTIL 830 PM CDT

* AT 756 PM CDT... DOPPLER RADAR AND SPOTTER REPORTS INDICATED A
  TORNADO 4 MILES SOUTHWEST OF KEWANEE MOVING NORTHEAST AT 35 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  KEWANEE                                    AROUND 800 PM CDT
  BRANDENBURG CORNERS                        AROUND 805 PM CDT
  ANNAWAN                                    AROUND 815 PM CDT

A TORNADO WAS REPORTED ON THE GROUND IN GALVA WITH DAMAGE REPORTED.

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

WEISSER


&

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 7:24 PM CDT	Tornado Warning	DVN	Jo Daviess	36 min
May 15, 7:43 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Whiteside	47 min
May 15, 7:53 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	62 min
May 15, 8:10 PM CDT	Tornado Warning	DVN	Whiteside	50 min
May 15, 8:15 PM CDT	Severe Thunderstorm Warning	DVN	Carroll	50 min
May 15, 8:18 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	47 min
May 15, 8:43 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	32 min
May 15, 8:50 PM CDT	Severe Thunderstorm Warning	DVN	Putnam	50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.