Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 39, NWS Quad Cities, IA

May 11, 2000Stephenson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at May 11, 2000, 8:58 AM CDT for Stephenson County, Illinois. It was in force for 47 min. 1 report 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 11, 2000, 8:58 AM CDT (13:58 UTC)
Expired: May 11, 2000, 9:45 AM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 115 km from the middle of the area, began a volume at 13:57 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 11, 9:15 AM CDT	Hail 0.75	Orangeville, 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 2.0 hours before the alert went out and 110 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 938 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KDVN 111358 COR
SVRMLI
ILC177-111445-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED MOVEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
858 AM CDT THU MAY 11 2000

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

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

* UNTIL 945 AM CDT

* AT 857 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM WITH LARGE HAIL OVER WARREN IN JO DAVIESS      
  COUNTY...MOVING EAST AT 45 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE WINSLOW...RED OAK...
  ORANGEVILLE...ONECO...MC CONNELL...LAKE LEAQUANA...BUENA VISTA AND
  AFOLKEY

AT 855 AM CDT LOCAL LAW ENFORCEMENT REPORTED GOLFBALL SIZED HAIL IN 
WARREN IN JO DAVIESS COUNTY.

THIS SEVERE THUNDERSTORM IS CAPABLE OF PRODUCING HAIL UP TO THE SIZE
OF GOLFBALLS OR 1.75 INCHES IN DIAMETER. TAKE COVER IN A STURDY
STRUCTURE UNTIL THE STORM PASSES.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.

LAT...LON 4251 8996 4238 8992 4238 8954 4250 8955

MCCLURE
&

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:50 AM CDT	Severe Thunderstorm Warning	DVN	Whiteside	40 min
May 11, 8:07 AM CDT	Severe Thunderstorm Warning	DVN	Carroll	53 min
May 11, 8:15 AM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	45 min
May 11, 8:25 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Whiteside	50 min
May 11, 8:54 AM CDT	Severe Thunderstorm Warning	DVN	Carroll	51 min
May 11, 9:12 AM CDT	Severe Thunderstorm Warning	DVN	Whiteside	48 min
May 11, 9:15 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry	45 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.