Alert archive / Missouri / Tornado Warnings in 2003

Tornado Warning 53, NWS St. Louis, MO

May 10, 2003Knox County, Missouri

NWS St. Louis, MO issued this tornado warning at May 10, 2003, 7:29 PM CDT for Knox County, Missouri. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 10, 2003, 7:29 PM CDT (00:29 UTC)
Expired: May 10, 2003, 8:15 PM CDT
In force: 46 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Knox County, MO

The radar

The St Louis radar (KLSX), 211 km from the middle of the area, began a volume at 00:30 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
May 10, 5:40 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 220 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: 1566 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 12.7

Open this sounding in Storm Lab

The text

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

424 
WFUS53 KLSX 110029
TORLSX
MOC103-110115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
729 PM CDT SAT MAY 10 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  KNOX COUNTY IN NORTHEAST MISSOURI

* UNTIL 815 PM CDT

* AT 729 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH STRONG ROTATION NEAR HURDLAND. THE STORM
  WAS MOVING NORTHEAST AT 45 MPH...AND MAY PRODUCE A TORNADO AT ANY
  TIME

* LOCATIONS IMPACTED INCLUDE...
  BARING
  EDINA
  GREENSBURG
  KNOX CITY
  COLONY

THIS TORNADO WARNING IS AN UPGRADE TO THE SEVERE THUNDERSTORM WARNING
PREVIOUSLY ISSUED FOR THE WARNED AREA.

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW MOVE TO A
BASEMENT...UNDERGROUND STORM SHELTER...OR AN INTERIOR ROOM OR HALLWAY
ON THE LOWEST LEVEL OF A STURDY BUILDING.

LAT...LON 4020 9250 3996 9231 3999 9200 4028 9195
          4032 9231

$$
FG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:22 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	38 min
May 10, 7:23 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	52 min
May 10, 8:32 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	43 min

Nearby

Tornado Warnings in Missouri, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.