Alert archive / Missouri / Tornado Warnings in 2012

Tornado Warning 1, NWS St. Louis, MO

January 17, 2012Gasconade County, Osage County, Missouri

NWS St. Louis, MO issued this tornado warning at Jan 17, 2012, 12:39 AM CST for Gasconade County, Osage County, Missouri. It was in force for 36 min. 2 reports 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: Jan 17, 2012, 12:39 AM CST (06:39 UTC)
Expired: Jan 17, 2012, 1:15 AM CST
In force: 36 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties Gasconade County, MO, Osage County, MO

The radar

The St Louis radar (KLSX), 88 km from the middle of the area, began a volume at 06:40 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
Jan 17, 1:11 AM CST	HAIL 0.25	Owensville, MO
Jan 17, 1:22 AM CST	HAIL 1	Owensville, MO	IN SOUTHWEST PART OF TOWN.

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
Jan 16, 11:47 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.7 hours before the alert went out and 251 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: 3 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 246 m²/s²
0-3 km storm-relative helicity: 361 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

025 
WFUS53 KLSX 170639
TORLSX
MOC073-151-170715-
/O.NEW.KLSX.TO.W.0001.120117T0639Z-120117T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1239 AM CST TUE JAN 17 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN OSAGE COUNTY IN CENTRAL MISSOURI...

* UNTIL 115 AM CST

* AT 1236 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 8 MILES WEST OF VIENNA...OR 24 MILES SOUTHWEST OF
  LINN...AND MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OWENSVILLE...FREEBURG...BLAND...ROSEBUD...ARGYLE AND CANAAN.

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 3847 9136 3823 9136 3822 9137 3821 9144
      3821 9153 3819 9154 3817 9165 3828 9165
      3829 9207
TIME...MOT...LOC 0638Z 256DEG 50KT 3820 9206

$$

TRUETT

1 follow-up statement

630 
WWUS53 KLSX 170659
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1259 AM CST TUE JAN 17 2012

MOC073-151-170715-
/O.CON.KLSX.TO.W.0001.000000T0000Z-120117T0715Z/
GASCONADE MO-OSAGE MO-
1259 AM CST TUE JAN 17 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN OSAGE AND
GASCONADE COUNTIES UNTIL 115 AM CST...

AT 1257 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR BELLE...OR 14 MILES SOUTHWEST OF OWENSVILLE...
MOVING EAST AT 55 MPH. 

LARGE...GOLF-BALL SIZED HAIL...IS ALSO LIKELY WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  OWENSVILLE...BLAND...ROSEBUD AND CANAAN.

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 3847 9136 3823 9136 3822 9137 3821 9144
      3821 9153 3819 9154 3817 9165 3828 9165
      3829 9207
TIME...MOT...LOC 0659Z 256DEG 50KT 3827 9170

$$

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 16, 11:59 PM CST	Severe Thunderstorm Warning	LSX	Callaway, Cole, Gasconade, Montgomery, Osage	58 days
Jan 17, 12:55 AM CST	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	35 min
Jan 17, 1:14 AM CST	Severe Thunderstorm Warning	LSX	Franklin, Gasconade	31 min
Jan 17, 1:23 AM CST	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	37 min
Jan 17, 1:39 AM CST	Tornado Warning	LSX	Franklin, Jefferson	36 min
Jan 17, 1:41 AM CST	Tornado Warning	LSX	Crawford, Franklin	34 min
Jan 17, 2:08 AM CST	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis, City of Saint Louis	37 min
Jan 17, 2:12 AM CST	Tornado Warning	LSX	Franklin, Jefferson, Washington	33 min
Jan 17, 2:35 AM CST	Tornado Warning	LSX	Jefferson, Saint Louis	40 min
Jan 17, 4:18 AM CST	Severe Thunderstorm Warning	LSX	Crawford	27 min
Jan 17, 4:34 AM CST	Areal Flood Advisory	LSX	Cole, Crawford, Franklin, Gasconade, Jefferson, Saint Charles and 3 more	60 days
Jan 17, 5:22 AM CST	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	38 min
Jan 17, 6:01 AM CST	Severe Thunderstorm Warning	LSX	Iron, Sainte Genevieve, Saint Francois, Washington	44 min
Jan 17, 6:25 AM CST	Severe Thunderstorm Warning	LSX	Iron, Madison, Reynolds, Saint Francois	50 min

Nearby

Tornado Warnings in Missouri, 2012 Every tornado warning in 2012 Tornadoes in 2012

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.