Alert archive / Illinois / Tornado Warnings in 2000

Tornado Warning 9, NWS Quad Cities, IA

May 18, 2000Henry County, Illinois

NWS Quad Cities, IA issued this tornado warning at May 18, 2000, 3:14 PM CDT for Henry County, Illinois. It was in force for 31 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 18, 2000, 3:14 PM CDT (20:14 UTC)
Expired: May 18, 2000, 3:45 PM CDT
In force: 31 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 20:14 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.

What was reported inside it

Time	Report	Where	Remark
May 18, 3:34 PM CDT	Tornado F0	Galva, IL

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 18, 11:30 AM CDT	Tornado Watch	SPC	6 hr
May 18, 3:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.2 hours before the alert went out and 43 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: 1779 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 2.4
Supercell composite: 10.8

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 182015
TORMLI
ILC073-182045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WARNING...CORRECTED FOR HEADING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
314 PM CDT THU MAY 18 2000

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

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

* UNTIL 345 PM CDT

* AT 310 PM CDT...SPOTTERS REPORT TORNADOES ALONG THE GUST FRONT
  EXTENDING FROM EAST OF GENESEO TO WEST OF CAMBRIDGE MOVING EAST
  AT 30 MPH.

* THE TORNADOES WILL NEAR...
   CAMBRIDGE NOW!
   ATKINSON BY 320 PM CDT.
   ANNAWAN BY 325 PM CDT.

THIS REPLACES THE PREVIOUS SEVERE THUNDERSTORM WARNING THAT WAS IN 
EFFECT



NICHOLS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 18, 10:55 AM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	50 min
May 18, 10:55 AM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess, Stephenson	50 min
May 18, 12:43 PM CDT	Severe Thunderstorm Warning	DVN	Whiteside	47 min
May 18, 2:29 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Rock Island	46 min
May 18, 3:14 PM CDT	Severe Thunderstorm Warning	DVN	Henry	31 min
May 18, 3:21 PM CDT	Tornado Warning	DVN	Bureau	24 min
May 18, 3:28 PM CDT	Severe Thunderstorm Warning	DVN	Whiteside	47 min
May 18, 3:43 PM CDT	Tornado Warning	DVN	Bureau	47 min
May 18, 3:47 PM CDT	Tornado Warning	DVN	Henry	28 min
May 18, 4:41 PM CDT	Tornado Warning	DVN	Putnam	34 min

Nearby

Tornado Warnings in Illinois, 2000 Every tornado warning in 2000 Tornadoes in 2000

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; radar from the NEXRAD Level II archive.