Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 71, NWS Quad Cities, IA

May 18, 2000Whiteside County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at May 18, 2000, 3:28 PM CDT for Whiteside County, Illinois. It was in force for 47 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: May 18, 2000, 3:28 PM CDT (20:28 UTC)
Expired: May 18, 2000, 4:15 PM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 55 km from the middle of the area, began a volume at 20:29 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, 3:30 PM CDT	Hail 0.75	Prophetstown, IL
May 18, 3:35 PM CDT	Hail 0.75	Tampico, 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, 8.5 hours before the alert went out and 49 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 
WUUS53 KDVN 182029
SVRMLI
ILC195-182115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
328 PM CDT THU MAY 18 2000

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WHITESIDE COUNTY IN NORTHWEST ILLINOIS

* UNTIL 415 PM CDT

* AT 319 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS OVER ERIE...
  OR 13 MILES SOUTHWEST OF MORRISON...MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
   DENROCK BY 330 PM CDT.
   HAMILTON CORNERS BY 335 PM CDT.
   BROOK HAVEN BY 340 PM CDT.
   ROCK FALLS BY 405 PM CDT.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO 1 INCH IN
DIAMETER AND WINDS IN EXCESS OF 55 MPH. TAKE COVER IN A STURDY
STRUCTURE UNTIL THE STORM PASSES.

LAT...LON 4171 9016 4154 9008 4164 8956 4186 8965


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, 3:14 PM CDT	Tornado Warning	DVN	Henry	31 min
May 18, 3:21 PM CDT	Tornado Warning	DVN	Bureau	24 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

Severe Thunderstorm Warnings in Illinois, 2000 Every severe thunderstorm warning 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.