Alert archive / Missouri / Tornado Warnings in 2001

Tornado Warning 1, NWS St. Louis, MO

April 9, 2001Washington County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 9, 2001, 10:18 PM CDT for Washington County, Missouri. It was in force for 42 min. 1 report 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 9, 2001, 10:18 PM CDT (03:18 UTC)
Expired: Apr 9, 2001, 11:00 PM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Washington County, MO

The radar

The St Louis radar (KLSX), 65 km from the middle of the area, began a volume at 03:20 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 9, 10:35 PM CDT	Hail 1	Richwoods, MO	Amateur radio spotters reported 1 inch hail.

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 00:00Z, 3.3 hours before the alert went out and 296 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: 1891 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 2017 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KLSX 100319
TORSTL
MOC221-100400-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1018 PM CDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 1100 PM CDT

* AT 1018 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH STRONG ROTATION 3 MILES SOUTHWEST OF RICHWOODS
  ...MOVING EAST AT 40 MPH.

* LOCATIONS IN THE PATH...
  RURAL NORTHEASTERN WASHINGTON COUNTY
  RICHWOODS
  OLD MINES


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.

LAT...LON 3821 9092 3803 9097 3800 9065 3808 9065
          3821 9079

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 8:26 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	49 min
Apr 9, 8:35 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	40 min
Apr 9, 8:44 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	46 min
Apr 9, 8:56 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	49 min
Apr 9, 8:59 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade	46 min
Apr 9, 9:19 PM CDT	Severe Thunderstorm Warning	LSX	Warren	41 min
Apr 9, 9:29 PM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	46 min
Apr 9, 9:34 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	26 min
Apr 9, 9:35 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	40 min
Apr 9, 9:43 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	47 min
Apr 9, 10:06 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	39 min
Apr 9, 10:46 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	44 min
Apr 10, 1:18 AM CDT	Severe Thunderstorm Warning	LSX	Boone	42 min
Apr 10, 1:55 AM CDT	Severe Thunderstorm Warning	LSX	Audrain	50 min
Apr 10, 2:29 AM CDT	Severe Thunderstorm Warning	LSX	Pike	46 min
Apr 10, 4:24 AM CDT	Severe Thunderstorm Warning	LSX	Pike	36 min
Apr 10, 6:26 PM CDT	Tornado Warning	LSX	Boone, Moniteau	64 min
Apr 10, 6:56 PM CDT	Tornado Warning	LSX	Callaway	64 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.