Alert archive / Illinois / Tornado Warnings in 2001

Tornado Warning 12, NWS St. Louis, MO

July 17, 2001Jersey County, Macoupin County, Illinois

NWS St. Louis, MO issued this tornado warning at Jul 17, 2001, 7:09 PM CDT for Jersey County, Macoupin County, Illinois. It was in force for 36 min. 4 reports 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: Jul 17, 2001, 7:09 PM CDT (00:09 UTC)
Expired: Jul 17, 2001, 7:45 PM CDT
In force: 36 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Jersey County, IL, Macoupin County, IL

The radar

The St Louis radar (KLSX), 71 km from the middle of the area, began a volume at 00:10 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
Jul 17, 7:10 PM CDT	Thunderstorm Wind 55 E	Kemper, IL
Jul 17, 7:20 PM CDT	Thunderstorm Wind 55 E	Jerseyville, IL
Jul 17, 7:20 PM CDT	Thunderstorm Wind 55 E	Jerseyville, IL
Jul 17, 7:25 PM CDT	Hail 0.75	Brighton, IL	Storm spotters reported 3/4 inch hail.

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
Jul 17, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.2 hours before the alert went out and 171 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: 2804 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 990 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KLSX 180010
TORSTL

ILC083-117-180045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
709 PM CDT TUE JUL 17 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS
  SOUTHWESTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 745 PM CDT

* AT 709 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO OVER KEMPER...MOVING SOUTH AT 25 MPH.

* LOCATIONS IN THE PATH...
  PIASA
  SHIPMAN
  MILES STATION
  DELHI
  BRIGHTON

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW! A BASEMENT
OFFERS THE BEST PROTECTION. IF A BASEMENT IS NOT AVAILABLE...MOVE TO
THE LOWEST FLOOR AND SEEK SHELTER IN A SMALL INTERIOR ROOM. STAY AWAY
FROM OUTSIDE WALLS AND WINDOWS. MOBILE HOMES SHOULD BE ABANDONED IN
FAVOR OF A MORE SUBSTANTIAL STRUCTURE. DO NOT TRY TO OUTRUN A TORNADO
IN A VEHICLE.

LIAT...LON 3927 9011 3923 9032 3903 9029 3904 9002

$$
EL/RP/JP

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	Madison	40 min
Jul 17, 8:17 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	58 min
Jul 17, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Washington	47 min
Jul 18, 1:45 PM CDT	Severe Thunderstorm Warning	LSX	Washington	30 min
Jul 18, 2:09 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	51 min

Nearby

Tornado Warnings in Illinois, 2001 Every tornado warning in 2001 Tornadoes in 2001

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.