Alert archive / Illinois / Tornado Warnings in 1999

Tornado Warning 4, NWS St. Louis, MO

February 11, 1999Greene County, Illinois

NWS St. Louis, MO issued this tornado warning at Feb 11, 1999, 2:09 PM CST for Greene County, Illinois. It was in force for 51 min. 1 report 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: Feb 11, 1999, 2:09 PM CST (20:09 UTC)
Expired: Feb 11, 1999, 3:00 PM CST
In force: 51 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 20:12 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
Feb 11, 2:19 PM CST	Tornado F1	Hillview, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Feb 11, 11:15 AM CST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.2 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-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: 394 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 310 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 112008
TORSTL
ILC061-112100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
209 PM CST THU FEB 11 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 300 PM CST

* AT 207 PM... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 3 MILES SOUTH OF BELLEVIEW... MOVING NORTHEAST AT 35 TO 40
  MPH.

* LOCATIONS IN THE PATH...
  HILLVIEW
  WALKERVILLE
  ELDRED
  WHITEHALL



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

GKS/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 11, 12:22 PM CST	Severe Thunderstorm Warning	LSX	Adams	48 min
Feb 11, 1:54 PM CST	Tornado Warning	LSX	Brown	46 min
Feb 11, 1:56 PM CST	Tornado Warning	LSX	Calhoun	49 min
Feb 11, 2:12 PM CST	Tornado Warning	LSX	Pike	48 min
Feb 11, 2:47 PM CST	Severe Thunderstorm Warning	LSX	Madison	48 min
Feb 11, 4:24 PM CST	Severe Thunderstorm Warning	LSX	Fayette	51 min
Feb 11, 4:37 PM CST	Severe Thunderstorm Warning	LSX	Marion	48 min

Nearby

Tornado Warnings in Illinois, 1999 Every tornado warning in 1999 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.