Alert archive / Missouri / Tornado Warnings in 2001

Tornado Warning 7, NWS Springfield, MO

April 11, 2001St. Clair County, Missouri

NWS Springfield, MO issued this tornado warning at Apr 11, 2001, 10:27 AM CDT for St. Clair County, Missouri. It was in force for 48 min. No storm report in the archive falls 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.

The facts

Issued: Apr 11, 2001, 10:27 AM CDT (15:27 UTC)
Expired: Apr 11, 2001, 11:15 AM CDT
In force: 48 min
Issued by: NWS Springfield, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County St. Clair County, MO

The radar

The Pleasant Hill radar (KEAX), 91 km from the middle of the area, began a volume at 15:31 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
Apr 11, 9:30 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 3.5 hours before the alert went out and 126 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: 614 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KSGF 111528
TORSGF
MOC185-111615-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1027 AM CDT WED APR 11 2001

THE NATIONAL WEATHER SERVICE IN SPRINGFIELD HAS ISSUED A

* TORNADO WARNING FOR...
  ST. CLAIR COUNTY IN WEST CENTRAL MISSOURI

* UNTIL 1115 AM CDT

* AT 1025 AM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO
  JUST WEST EL DORADO SPRINGS ON HIGHWAY 54...OR 16 MILES EAST OF 
  NEVADA...MOVING NORTHEAST AT 45 MPH.

* THE TORNADO WILL REMAIN OVER MAINLY RURAL AREAS OF...
  ST. CLAIR COUNTY.

THE TOWNS OF TIFFIN...TABERVILLE...MONEGAW SPRINGS AND JOHNSON CITY
ARE ALSO IN THE PATH OF THIS TORNADO.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR4 HANDS.

LAT...LON 3804 9408 3788 9407 3795 9357 3825 9385

FOSTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 9:31 AM CDT	Severe Thunderstorm Warning	SGF	Barry, Lawrence, Newton	44 min
Apr 11, 9:48 AM CDT	Severe Thunderstorm Warning	SGF	Barton, Jasper	42 min
Apr 11, 9:48 AM CDT	Severe Thunderstorm Warning	SGF	Vernon	42 min
Apr 11, 10:09 AM CDT	Severe Thunderstorm Warning	SGF	Cedar, St. Clair	51 min
Apr 11, 10:09 AM CDT	Severe Thunderstorm Warning	SGF	Dade	51 min
Apr 11, 10:16 AM CDT	Severe Thunderstorm Warning	SGF	Christian, Lawrence, Stone	44 min
Apr 11, 10:31 AM CDT	Severe Thunderstorm Warning	SGF	Christian, Greene	44 min
Apr 11, 10:31 AM CDT	Severe Thunderstorm Warning	SGF	Taney	44 min
Apr 11, 10:42 AM CDT	Severe Thunderstorm Warning	SGF	Benton, Hickory	48 min
Apr 11, 10:42 AM CDT	Severe Thunderstorm Warning	SGF	Polk	48 min
Apr 11, 11:10 AM CDT	Severe Thunderstorm Warning	SGF	Dallas, Webster	50 min
Apr 11, 12:20 PM CDT	Severe Thunderstorm Warning	SGF	Laclede	25 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.