Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS St. Louis, MO

January 17, 2012Lincoln County, Saint Charles County, Warren County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jan 17, 2012, 12:55 AM CST for Lincoln County, Saint Charles County, Warren County, Missouri. It was in force for 35 min. 4 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, 12:55 AM CST (06:55 UTC)
Expired: Jan 17, 2012, 1:30 AM CST
In force: 35 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Lincoln County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 27 km from the middle of the area, began a volume at 06:57 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
Jan 17, 1:10 AM CST	TSTM WND GST 40	Wentzville, MO
Jan 17, 1:10 AM CST	HAIL 0.5	Wentzville, MO
Jan 17, 1:15 AM CST	HAIL 1	Flint Hill, MO
Jan 17, 1:36 AM CST	HAIL 0.25	2 W St. Peters, 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
Jan 16, 11:47 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 6.9 hours before the alert went out and 232 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: 2 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 431 m²/s²
0-3 km storm-relative helicity: 500 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.

884 
WUUS53 KLSX 170655
SVRLSX
MOC113-183-219-170730-
/O.NEW.KLSX.SV.W.0002.120117T0655Z-120117T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1255 AM CST TUE JAN 17 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHEASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 130 AM CST

* AT 1250 AM CST...LOCAL LAW ENFORCEMENT REPORTED A SEVERE
  THUNDERSTORM PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR TRUESDALE...OR NEAR
  WARRENTON...AND MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TROY...WENTZVILLE...LAKE ST. LOUIS...ST. PAUL...O'FALLON...ST.
  PETERS...MOSCOW MILLS...WINFIELD...FORISTELL...FLINT HILL...OLD
  MONROE AND FOLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3906 9072 3898 9068 3893 9067 3891 9064
      3878 9058 3870 9122 3897 9112
TIME...MOT...LOC 0655Z 252DEG 52KT 3885 9105
WIND...HAIL 60MPH 1.75IN

$$

BRITT

2 follow-up statements

312 
WWUS53 KLSX 170707
SVSLSX

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

MOC113-183-219-170730-
/O.CON.KLSX.SV.W.0002.000000T0000Z-120117T0730Z/
LINCOLN MO-ST. CHARLES MO-WARREN MO-
107 AM CST TUE JAN 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
WARREN...NORTHWESTERN ST. CHARLES AND SOUTHERN LINCOLN COUNTIES UNTIL
130 AM CST...

AT 105 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
MOSCOW MILLS...OR 6 MILES NORTH OF WENTZVILLE...MOVING EAST AT 60
MPH.

LOCATIONS IMPACTED INCLUDE...
  LAKE ST. LOUIS...ST. PAUL...O'FALLON...ST. PETERS...WINFIELD...OLD
  MONROE AND FOLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3872 9112 3900 9095 3906 9072 3898 9068
      3893 9067 3891 9064 3878 9058
TIME...MOT...LOC 0706Z 252DEG 52KT 3890 9085
WIND...HAIL 60MPH 1.00IN

$$

BRITT

942 
WWUS53 KLSX 170727
SVSLSX

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

MOC113-183-219-170735-
/O.EXP.KLSX.SV.W.0002.000000T0000Z-120117T0730Z/
LINCOLN MO-ST. CHARLES MO-WARREN MO-
127 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WARREN...
NORTHWESTERN ST. CHARLES AND SOUTHERN LINCOLN COUNTIES WILL EXPIRE AT
130 AM CST...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

A NEW SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED UNTIL 200 AM CST 
FOR ST. CHARLES COUNTY FOR A SEPARATE STORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 7 AM CDT.

LAT...LON 3872 9112 3900 9095 3906 9072 3898 9068
      3893 9067 3891 9064 3878 9058
TIME...MOT...LOC 0725Z 252DEG 52KT 3898 9051

$$

BRITT

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, 12:39 AM CST	Tornado Warning	LSX	Gasconade, Osage	36 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

Severe Thunderstorm Warnings in Missouri, 2012 Every severe thunderstorm warning 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.