Alert archive / Missouri / Tornado Warnings in 2001

Tornado Warning 6, NWS St. Louis, MO

April 10, 2001Saint Charles County, Saint Louis County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 10, 2001, 8:27 PM CDT for Saint Charles County, Saint Louis County, Missouri. It was in force for 63 min. 14 reports came from 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, with what was reported inside it.

The facts

Issued: Apr 10, 2001, 8:27 PM CDT (01:27 UTC)
Expired: Apr 10, 2001, 9:30 PM CDT
In force: 63 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 16 km from the middle of the area, began a volume at 01:29 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
Apr 10, 8:30 PM CDT	Tornado F0	Foristell, MO	The 4th tornado spawned by the Heavy Precipitation Supercell that crossed central and eastern Missouri formed just east of Foristell and traveled 4 miles to just west of Wentzville. The tornado formed along the outer road of Interstate 70 where it destroyed a
Apr 10, 8:40 PM CDT	Thunderstorm Wind 55 E	Dardenne, MO	Amateur radio spotters reported power lines down.
Apr 10, 8:45 PM CDT	Tornado F1	Lake St Louis, MO	The 5th tornado spawned by the Heavy Precipitation Supercell that moved across the NWS St. Louis County Warning Area formed in Lake St. Louis. Most of the damage was at the Mystic Village apartment complex where the tornado was briefly F1 in intensity. Altoget
Apr 10, 8:45 PM CDT	Hail 1	O Fallon, MO
Apr 10, 8:50 PM CDT	Hail 1	St Peters, MO
Apr 10, 9:05 PM CDT	Hail 1.5	Cottleville, MO
Apr 10, 9:05 PM CDT	Hail 2	St Charles, MO
Apr 10, 9:05 PM CDT	Hail 1	St Charles, MO
Apr 10, 9:10 PM CDT	Hail 1.5	(Stl)Lambert Fld St, MO
Apr 10, 9:10 PM CDT	Hail 1.75	Bridgeton, MO
Apr 10, 9:15 PM CDT	Hail 2.5	Florissant, MO
Apr 10, 9:20 PM CDT	Hail 2	Florissant, MO
Apr 10, 9:20 PM CDT	Hail 1	Florissant, MO
Apr 10, 9:32 PM CDT	Hail 2.75	Bellefontaine Neighb, MO

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
Apr 10, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.5 hours before the alert went out and 225 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: 314 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KLSX 110131
TORSTL
MOC183-189-110230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
827 PM CDT TUE APR 10 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI
  NORTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 930 PM CDT

* AT 827 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A THUNDERSTORM WITH STRONG ROTATION 10 MILES WEST OF FLINT 
  HILL OR NEAR WRIGHT CITY...MOVING EAST AT 45 MPH.  A TORNADO MAY
  OCCUR AT ANY TIME.  TAKE SHELTER NOW

* LOCATIONS IN THE PATH...
  ST. PAUL
  WENTZVILLE
  O FALLON
  LAKE ST LOUIS 
  KAMPVILLE
  ST. CHARLES
  ST. PETERS
  FLORISSANT
  BLACK JACK
  WEST ALTON
  SPANISH LAKE

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

IF YOU ARE IN A VEHICLE...LEAVE IT IMMEDIATELY AND GO TO A STRONG
BUILDING. DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE
EASILY TOSSED AROUND BY TORNADO WINDS. IF NO STRUCTURE IS NEARBY...
SEEK SHELTER IN A DITCH OR LOW SPOT.

LAT...LON 3889 9095 3857 9097 3864 9035 3882 9016
          3890 9020 3894 9044 3887 9058

GKS/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 7:08 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	67 min
Apr 10, 7:17 PM CDT	Flash Flood Warning	LSX	Boone	118 min
Apr 10, 7:28 PM CDT	Tornado Warning	LSX	Montgomery	62 min
Apr 10, 7:49 PM CDT	Tornado Warning	LSX	Warren	56 min
Apr 10, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	62 min
Apr 10, 9:08 PM CDT	Tornado Warning	LSX	City of Saint Louis	67 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.