Alert archive / Missouri / Tornado Warnings in 2003

Tornado Warning 31, NWS St. Louis, MO

May 9, 2003Boone County, Missouri

NWS St. Louis, MO issued this tornado warning at May 9, 2003, 6:18 PM CDT for Boone County, Missouri. It was in force for 42 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 9, 2003, 6:18 PM CDT (23:18 UTC)
Expired: May 9, 2003, 7:00 PM CDT
In force: 42 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Boone County, MO

The radar

The St Louis radar (KLSX), 152 km from the middle of the area, began a volume at 23:21 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 9, 4:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.3 hours before the alert went out and 281 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: 2743 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 12.4

Open this sounding in Storm Lab

The text

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

716 
WFUS53 KLSX 092318
TORLSX
MOC019-100000-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
618 PM CDT FRI MAY 9 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN BOONE COUNTY IN CENTRAL MISSOURI

* UNTIL 700 PM CDT

* AT 618 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH STRONG ROTATION 6 MILES SOUTHEAST OF
  HARRISBURG. THE STORM WAS MOVING EAST AT 25 MPH...AND MAY PRODUCE A
  TORNADO AT ANY TIME

* LOCATIONS IMPACTED INCLUDE...
  STURGEON
  HALLSVILLE
  MURRY
  CENTRALIA

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 3917 9249 3900 9242 3905 9213 3924 9211
          3925 9241

$$
GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 7:24 PM CDT	Severe Thunderstorm Warning	LSX	Knox	36 min
May 8, 7:48 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Ralls	27 min
May 8, 8:21 PM CDT	Severe Thunderstorm Warning	LSX	Marion	39 min
May 8, 10:21 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	39 min
May 8, 10:26 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	49 min
May 8, 10:51 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone	54 min
May 8, 11:03 PM CDT	Tornado Warning	LSX	Audrain, Boone	42 min
May 8, 11:45 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	30 min
May 9, 12:04 AM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	41 min
May 9, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Ralls	48 min
May 9, 5:47 PM CDT	Severe Thunderstorm Warning	LSX	Pike, Ralls	43 min
May 9, 5:59 PM CDT	Severe Thunderstorm Warning	LSX	Boone	46 min
May 9, 6:05 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe	40 min
May 9, 6:17 PM CDT	Tornado Warning	LSX	Pike	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.