Alert archive / Missouri / Tornado Warnings in 2001

Tornado Warning 5, NWS St. Louis, MO

April 10, 2001Warren County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 10, 2001, 7:49 PM CDT for Warren County, Missouri. It was in force for 56 min. 2 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, 7:49 PM CDT (00:49 UTC)
Expired: Apr 10, 2001, 8:45 PM CDT
In force: 56 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Warren County, MO

The radar

The St Louis radar (KLSX), 49 km from the middle of the area, began a volume at 00:48 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, 8:14 PM CDT	Hail 1.75	Warrenton, MO	The State Highway Patrol reported golf ball size hail along I-70 west of Warrenton.
Apr 10, 8:20 PM CDT	Tornado F0	Wright City, MO	A small tornado formed briefly just west of Wright City. One mobile home on a sales lot was overturned.

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, 0.8 hours before the alert went out and 269 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 110053
TORSTL
MOC219-110145-

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  WARREN COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 845 PM CDT

* AT 730 PM CDT...STORM SPOTTERS REPORTED A TORNADO AROUND 2 MILES
  NORTH OF FULTON.  THE TORNADO WAS MOVING TO THE EAST AT 40
  MPH...AND IS FORECAST TO MOVE INTO THE WESTERN PORTION OF WARREN
  COUNTY AROUND 8 PM.

* LOCATIONS IN THE PATH...
  WARRENTON
  TRUESDALE
  WRIGHT CITY
  FORISTELL
  HOLSTEIN
 
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 3899 9124 3882 9130 3885 9142 3873 9142
          3871 9137 3856 9097 3887 9096 3888 9111

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, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	62 min
Apr 10, 8:27 PM CDT	Tornado Warning	LSX	Saint Charles, Saint Louis	63 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.