Alert archive / Illinois / Tornado Warnings in 1999

Tornado Warning 71, NWS Lincoln, IL

August 12, 1999Mason County, Illinois

NWS Lincoln, IL issued this tornado warning at Aug 12, 1999, 7:44 PM CDT for Mason County, Illinois. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 12, 1999, 7:44 PM CDT (00:44 UTC)
Expired
Aug 12, 1999, 8:30 PM CDT
In force
46 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Mason County, IL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 12, 6:45 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.7 hours before the alert went out and 112 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 1999-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1165 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 1999-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 322 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1165 J/kg
Mixed-layer CIN
-260 J/kg
Mixed-layer LCL
1321 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
322 m²/s²
0-3 km storm-relative helicity
437 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 130044 RRA
TORSPI
ILC125-130130-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
744 PM CDT THU AUG 12 1999

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* TORNADO WARNING FOR...
  MASON COUNTY IN CENTRAL ILLINOIS

* UNTIL 830 PM CDT

* AT 745 PM CDT... LINCOLN DOPPLER RADAR INDICATED A POSSIBLE TORNADO
  NEAR SNICARTE... MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  SNICARTE
  BATH
  MASpON CITY
  KILBOURNE

TORNADOES ARE ESPECIALLY DANGEROUS AT NIGHT...BECAUSE THEY ARE HARD
TO SEE. TAKE COVER IN A BASEMENT OR INTERIOR ROOM ON THE LOWEST
FLOOR.

BYRD/SMITH

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 7:17 PM CDTSevere Thunderstorm WarningILXFulton43 min
Aug 12, 7:20 PM CDTSevere Thunderstorm WarningILXCass, Mason70 min
Aug 12, 7:25 PM CDTSevere Thunderstorm WarningILXSchuyler65 min
Aug 12, 7:38 PM CDTSevere Thunderstorm WarningILXMenard52 min
Aug 12, 7:52 PM CDTSevere Thunderstorm WarningILXLogan53 min
Aug 12, 8:09 PM CDTSevere Thunderstorm WarningILXTazewell51 min
Aug 12, 8:16 PM CDTSevere Thunderstorm WarningILXMorgan, Scott59 min
Aug 12, 8:24 PM CDTSevere Thunderstorm WarningILXCass66 min
Aug 12, 8:31 PM CDTSevere Thunderstorm WarningILXDeWitt, McLean59 min
Aug 12, 8:41 PM CDTSevere Thunderstorm WarningILXMacon64 min
Aug 12, 8:55 PM CDTSevere Thunderstorm WarningILXMenard, Sangamon65 min
Aug 12, 9:03 PM CDTSevere Thunderstorm WarningILXPiatt42 min
Aug 12, 9:16 PM CDTSevere Thunderstorm WarningILXMorgan, Scott59 min
Aug 12, 9:35 PM CDTSevere Thunderstorm WarningILXChampaign40 min
Aug 12, 10:02 PM CDTSevere Thunderstorm WarningILXSangamon33 min
Aug 12, 10:15 PM CDTSevere Thunderstorm WarningILXDouglas, Vermilion60 min
Aug 12, 10:15 PM CDTSevere Thunderstorm WarningILXMoultrie60 min
Aug 12, 10:17 PM CDTSevere Thunderstorm WarningILXChampaign33 min
Aug 12, 10:22 PM CDTSevere Thunderstorm WarningILXChristian63 min
Aug 12, 10:34 PM CDTSevere Thunderstorm WarningILXColes, Shelby61 min
Aug 12, 10:34 PM CDTSevere Thunderstorm WarningILXEdgar61 min
Aug 12, 11:10 PM CDTSevere Thunderstorm WarningILXClark, Cumberland60 min
Aug 12, 11:15 PM CDTFlash Flood WarningILXLogan4 hr
Aug 12, 11:29 PM CDTFlash Flood WarningILXDeWitt4 hr
Aug 12, 11:31 PM CDTFlash Flood WarningILXMenard3 hr
Aug 13, 12:51 AM CDTFlash Flood WarningILXChampaign, Piatt3 hr
Aug 13, 12:56 AM CDTFlash Flood WarningILXMacon2 hr

Nearby

Tornado Warnings in Illinois, 1999Every tornado warning in 1999Tornadoes in 1999

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.