Alert archive / Missouri / Tornado Warnings in 2004

Tornado Warning 51, NWS St. Louis, MO

August 17, 2004Washington County, Missouri

NWS St. Louis, MO issued this tornado warning at Aug 17, 2004, 7:21 PM CDT for Washington County, Missouri. It was in force for 39 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 17, 2004, 7:21 PM CDT (00:21 UTC)
Expired: Aug 17, 2004, 8:00 PM CDT
In force: 39 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Washington County, MO

The radar

The St Louis radar (KLSX), 97 km from the middle of the area, began a volume at 00:24 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
Aug 17, 7:54 PM CDT	HAIL 1.75	Belgrade, MO	GOLF BALL SIZED HAIL REPORTED IN THE BELGRADE/CALEDONIA AREA BY COUNTY SHERIFF DEPARTMENT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.4 hours before the alert went out and 280 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: -23 J/kg
Mixed-layer LCL: 1530 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KLSX 180021
TORLSX
MOC221-180100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
721 PM CDT TUE AUG 17 2004

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 800 PM CDT

* AT 721 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH STRONG ROTATION 6 MILES NORTHWEST OF
  BELGRADE. THE STORM WAS MOVING SOUTHEAST AT 25 MPH...AND MAY
  PRODUCE A TORNADO AT ANY TIME

* LOCATIONS IMPACTED INCLUDE...
  BELGRADE
  CALEDONIA

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 3795 9094 3782 9109 3774 9103 3773 9071
      3778 9064 3792 9066

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 7:40 PM CDT	Tornado Warning	LSX	Iron	50 min
Aug 17, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	Washington	47 min
Aug 17, 8:54 PM CDT	Severe Thunderstorm Warning	LSX	Iron	51 min
Aug 17, 9:47 PM CDT	Severe Thunderstorm Warning	LSX	Iron	43 min

Nearby

Tornado Warnings in Missouri, 2004 Every tornado warning in 2004 Tornadoes in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.