Alert archive / Missouri / Tornado Warnings in 2001

Tornado Warning 20, NWS St. Louis, MO

October 24, 2001Jefferson County, Missouri

NWS St. Louis, MO issued this tornado warning at Oct 24, 2001, 12:50 PM CDT for Jefferson County, Missouri. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Oct 24, 2001, 12:50 PM CDT (17:50 UTC)
Expired: Oct 24, 2001, 1:30 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 35 km from the middle of the area, began a volume at 17:50 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 watch it was issued in

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

Issued	Product	Office	Lasted
Oct 24, 11:45 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.8 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: 1102 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 597 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

538 
WFUS53 KLSX 241750
TORSTL
MOC099-241830-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1250 PM CDT WED OCT 24 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 130 PM CDT

* AT 1250 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH STRONG ROTATION OVER SCOTSDALE...MOVING NORTHEAST
  AT 50 MPH.

* LOCATIONS IN THE PATH...
  ARNOLD

THIS IS A VERY DANGEROUS STORM IF YOU ARE IN THE PATH OF THIS
TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE. OTHERWISE...GO
TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. AVOID WINDOWS.
ABANDON CARS AND MOBILE HOMES FOR A STURDIER BUILDING OR GET INTO A
DITCH OR CULVERT.

LAT...LON 3848 9074 3824 9075 3827 9037 3841 9035
          3851 9043

RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 23, 7:38 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	67 min
Oct 23, 7:57 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	48 min
Oct 23, 8:15 PM CDT	Severe Thunderstorm Warning	LSX	City of Saint Louis	30 min
Oct 23, 9:41 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	49 min
Oct 24, 10:44 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln	61 min
Oct 24, 11:16 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade	44 min
Oct 24, 11:28 AM CDT	Tornado Warning	LSX	Franklin, Gasconade	32 min
Oct 24, 11:45 AM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	45 min
Oct 24, 12:03 PM CDT	Tornado Warning	LSX	Franklin, Saint Louis	57 min
Oct 24, 12:12 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin	48 min
Oct 24, 12:39 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	51 min
Oct 24, 12:52 PM CDT	Severe Thunderstorm Warning	LSX	City of Saint Louis	53 min
Oct 24, 1:41 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois, Washington	49 min
Oct 24, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve	51 min
Oct 24, 1:57 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	48 min
Oct 24, 2:11 PM CDT	Severe Thunderstorm Warning	LSX	Madison	49 min

Nearby

Tornado Warnings in Missouri, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.