Alert archive / Missouri / Tornado Warnings in 2011

Tornado Warning 12, NWS St. Louis, MO

March 4, 2011Boone County, Callaway County, Montgomery County, Missouri

NWS St. Louis, MO issued this tornado warning at Mar 4, 2011, 3:34 PM CST for Boone County, Callaway County, Montgomery County, Missouri. It was in force for 41 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: Mar 4, 2011, 3:34 PM CST (21:34 UTC)
Expired: Mar 4, 2011, 4:15 PM CST
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties Boone County, MO, Callaway County, MO, Montgomery County, MO

The radar

The St Louis radar (KLSX), 85 km from the middle of the area, began a volume at 21:37 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
Mar 4, 4:06 PM CST	HAIL 0.25	Fulton, MO

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 4, 1:33 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.6 hours before the alert went out and 293 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: 18 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 1021 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 313 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

744 
WFUS53 KLSX 042134
TORLSX
MOC019-027-139-042215-
/O.NEW.KLSX.TO.W.0012.110304T2134Z-110304T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
334 PM CST FRI MAR 4 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN BOONE COUNTY IN CENTRAL MISSOURI...
  CENTRAL CALLAWAY COUNTY IN CENTRAL MISSOURI...
  MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 415 PM CST

* AT 333 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE SQUALL LINE CAPABLE OF PRODUCING BRIEF RAIN-WRAPPED
  TORNADOES IN ADDITION TO WIDESPREAD STRAIGHT LINE WIND DAMAGE. THIS
  DANGEROUS STORM WAS LOCATED 7 MILES NORTHEAST OF ASHLAND...AND
  MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FULTON...MONTGOMERY CITY...WILLIAMSBURG...SHAMROCK...MINEOLA...NEW
  FLORENCE...BUELL...BELLFLOWER...CARRINGTON...KINGDOM CITY...
  DANVILLE AND HIGH HILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3907 9136 3885 9131 3885 9142 3882 9142
      3873 9223 3891 9227
TIME...MOT...LOC 2135Z 259DEG 41KT 3884 9213

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 4, 2:47 PM CST	Severe Thunderstorm Warning	LSX	Boone	43 min
Mar 4, 3:13 PM CST	Severe Thunderstorm Warning	LSX	Callaway, Cole, Moniteau, Osage	47 min
Mar 4, 3:20 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Boone	40 min
Mar 4, 3:28 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Montgomery	47 min
Mar 4, 3:45 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Ralls	45 min
Mar 4, 3:49 PM CST	Tornado Warning	LSX	Audrain, Monroe, Pike, Ralls	56 min
Mar 4, 3:59 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Franklin, Gasconade, Lincoln, Montgomery and 3 more	46 min
Mar 4, 4:27 PM CST	Tornado Warning	LSX	Lincoln, Montgomery, Warren	33 min
Mar 4, 4:39 PM CST	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Lincoln, Pike, Saint Charles, Warren	51 min
Mar 4, 4:40 PM CST	Tornado Warning	LSX	Pike	51 min
Mar 4, 5:23 PM CST	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	29 min

Nearby

Tornado Warnings in Missouri, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.