Alert archive / Illinois / Tornado Warnings in 2003

Tornado Warning 40, NWS Quad Cities, IA

July 9, 2003McDonough County, Illinois

NWS Quad Cities, IA issued this tornado warning at Jul 9, 2003, 9:45 PM CDT for McDonough County, Illinois. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2003, 9:45 PM CDT (02:45 UTC)
Expired: Jul 9, 2003, 10:45 PM CDT
In force: 60 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County McDonough County, IL

The radar

The Lincoln radar (KILX), 96 km from the middle of the area, began a volume at 02:46 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
Jul 9, 8:20 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.8 hours before the alert went out and 144 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: 1258 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 757 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDVN 100245
TORDVN
ILC109-100345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
943 PM CDT WED JUL 9 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  MCDONOUGH COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 1045 PM CDT

* AT 942 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A POSSIBLE TORNADO 2 MILES SOUTHEAST OF
  ARGYLE LAKE STATE PARK...OR 4 MILES SOUTHWEST OF MACOMB...MOVING 
  SOUTHEAST AT 35 MPH. OTHER TORNADIC STORMS MAY PUSH OUT OF 
  HENDERSON COUNTY AND AFFECT THE NORTHERN PORTION OF THE COUNTY.

* THE TORNADO IS EXPECTED TO BE NEAR...
  PENNINGTON POINT BY 950 PM CDT.
  5 MILES SOUTHWEST OF ADAIR BY 955 PM CDT.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT OR ON THE
LOWEST FLOOR OF A BUILDING IN AN INTERIOR HALLWAY OR ROOM.

NIGHTTIME TORNADOES ARE ESPECIALLY DANGEROUS BECAUSE THEY ARE
DIFFICULT TO SEE. TAKE COVER NOW

BRIEF, TORNADOES ARE FAVORABLE TO OCCUR ALONG THE LEADING EDGE OF THE
STORMS...CAPABLE OF LOCALIZED, ENHANCED DAMAGE IN ADDITION TO STRAIGHT
LINE WINDS.

LAT...LON 4055 9079 4040 9090 3995 8996 4017 8980

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 8:38 PM CDT	Tornado Warning	DVN	Warren	32 min
Jul 9, 9:03 PM CDT	Tornado Warning	DVN	Hancock	42 min
Jul 9, 9:43 PM CDT	Tornado Warning	DVN	Henderson, Warren	47 min
Jul 9, 9:49 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	41 min
Jul 9, 10:08 PM CDT	Flash Flood Warning	DVN	McDonough	4 hr

Nearby

Tornado Warnings in Illinois, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.