Alert archive / Illinois / Tornado Warnings in 1999

Tornado Warning 45, NWS St. Louis, MO

June 4, 1999Greene County, Illinois

NWS St. Louis, MO issued this tornado warning at Jun 4, 1999, 5:35 PM CDT for Greene County, Illinois. It was in force for 50 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
Jun 4, 1999, 5:35 PM CDT (22:35 UTC)
Expired
Jun 4, 1999, 6:25 PM CDT
In force
50 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Greene County, IL

The radar

The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 22:35 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.6 hours before the alert went out and 177 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 12:00Z on 1999-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 1999-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1578 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 042235
TORSTL
ILC061-042325-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
535 PM CDT FRI JUN 4 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 625 PM CDT

* AT 533 PM... AREA LAW ENFORCEMENT INDICATED A TORNADO JUST NORTH
  OF ROODHOUSE... MOVING EAST SOUTHEAST AT 25 MPH.

* LOCATIONS IN THE PATH...
  ROODHOUSE
  WHITE HALL
  CARROLTON
  GREENFIELD

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW! A
BASEMENT OFFERS THE BEST PROTECTION. IF 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

FG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 4:30 PM CDTSevere Thunderstorm WarningLSXAdams, Brown65 min
Jun 4, 5:09 PM CDTSevere Thunderstorm WarningLSXPike61 min
Jun 4, 5:37 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery63 min
Jun 4, 6:28 PM CDTSevere Thunderstorm WarningLSXBond, Fayette62 min
Jun 4, 6:28 PM CDTSevere Thunderstorm WarningLSXMadison62 min
Jun 4, 6:40 PM CDTSevere Thunderstorm WarningLSXMacoupin, Montgomery35 min
Jun 4, 6:45 PM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey60 min
Jun 4, 6:52 PM CDTSevere Thunderstorm WarningLSXClinton, Saint Clair63 min
Jun 4, 6:52 PM CDTSevere Thunderstorm WarningLSXMarion63 min

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; radar from the NEXRAD Level II archive.