Alert archive / Missouri / Tornado Warnings in 1999

Tornado Warning 7, NWS St. Louis, MO

February 27, 1999Jefferson County, Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this tornado warning at Feb 27, 1999, 12:13 PM CST for Jefferson County, Missouri; Monroe County, Illinois. It was in force for 47 min. 3 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: Feb 27, 1999, 12:13 PM CST (18:13 UTC)
Expired: Feb 27, 1999, 1:00 PM CST
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Monroe County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 55 km from the middle of the area, began a volume at 18:13 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
Feb 27, 12:25 PM CST	Hail 1	Antonia, MO
Feb 27, 12:37 PM CST	Hail 1	De Soto, MO
Feb 27, 1:10 PM CST	Hail 1	Waterloo, 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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 6.2 hours before the alert went out and 258 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: 107 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 275 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

999 
WFUS1 KSTL 271815 RRA
TORSTL
ILC133-MOC099-271900-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1213 PM CST SAT FEB 27 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  MONROE COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS
  EASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 100 PM CST

* AT 1212 PM CST... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A TORNADO NORTHERN JEFFERSON COUNTY NORTH OF HILLSBORO... MOVING
  NORTHEAST AT 30 MPH.

* LOCATIONS IN THE PATH...
  PEVELY
  BARNHART
  ARNOLD
  WATERLOO IL



DOPPLER RADAR IS SHOWING A STRONG TORNADO SIGNAL. IF YOU ARE IN
THE PATH MOVE TO A SHELTER NOW A BASEMENT IS BEST...BUT IF NOT
AVAILABLE...MOVE TO THE LOWEST LEVEL AND HIDE IN A SMALL INTERIOR
ROOM. GET OUT OF MOBILE HOMES AND CARS IN FAVOR OF A STRONG
BUILDING.

TES/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 10:47 AM CST	Severe Thunderstorm Warning	LSX	Crawford	33 min
Feb 27, 11:09 AM CST	Severe Thunderstorm Warning	LSX	Franklin	46 min
Feb 27, 11:14 AM CST	Severe Thunderstorm Warning	LSX	Washington	51 min
Feb 27, 11:22 AM CST	Severe Thunderstorm Warning	LSX	Crawford	48 min
Feb 27, 11:24 AM CST	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	51 min
Feb 27, 12:11 PM CST	Severe Thunderstorm Warning	LSX	Jefferson	34 min
Feb 27, 12:39 PM CST	Severe Thunderstorm Warning	LSX	Jefferson	46 min
Feb 27, 11:34 AM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	66 min
Feb 27, 11:51 AM CST	Tornado Warning	LSX	Madison, Saint Clair	49 min
Feb 27, 12:26 PM CST	Tornado Warning	LSX	Bond, Clinton	44 min
Feb 27, 12:45 PM CST	Severe Thunderstorm Warning	LSX	Fayette	50 min
Feb 27, 12:49 PM CST	Severe Thunderstorm Warning	LSX	Saint Clair	46 min
Feb 27, 1:05 PM CST	Severe Thunderstorm Warning	LSX	Monroe	50 min
Feb 27, 1:07 PM CST	Severe Thunderstorm Warning	LSX	Clinton	48 min
Feb 27, 1:26 PM CST	Severe Thunderstorm Warning	LSX	Randolph	49 min
Feb 27, 1:37 PM CST	Severe Thunderstorm Warning	LSX	Marion	48 min

Nearby

Tornado Warnings in Missouri, 1999 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.