Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 5, NWS St. Louis, MO

January 17, 2012Jefferson County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jan 17, 2012, 2:08 AM CST for Jefferson County, Saint Louis County, City of Saint Louis, Missouri; Madison County, Saint Clair County, Illinois. It was in force for 37 min. 10 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, 2:08 AM CST (08:08 UTC)
Expired: Jan 17, 2012, 2:45 AM CST
In force: 37 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Madison County, IL, Saint Clair County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 42 km from the middle of the area, began a volume at 08:10 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, 2:08 AM CST	HAIL 0.5	Clayton, MO
Jan 17, 2:10 AM CST	HAIL 0.7	High Ridge, MO
Jan 17, 2:10 AM CST	HAIL 0.88	St. Louis, MO	NORTH SIDE OF CITY.
Jan 17, 2:18 AM CST	HAIL 1	Sunset Hills, MO
Jan 17, 2:22 AM CST	HAIL 1	Granite City, IL
Jan 17, 2:24 AM CST	HAIL 1	Crestwood, MO
Jan 17, 2:35 AM CST	TSTM WND DMG	4 N Millstadt, IL	LARGE POLE BARN BLOWN DOWN ON CLOVER LEAF ROAD NEAR INTERSECTION WITH ILLINOIS ROUTE 163.
Jan 17, 2:40 AM CST	TSTM WND DMG	Belleville, IL	WIND DAMAGED AN OUTBUILDING AT BELLEVILLE WEST HIGH SCHOOL. TIME ESTIMATED FROM RADAR.
Jan 17, 2:41 AM CST	HAIL 0.25	Belleville, IL
Jan 17, 2:50 AM CST	HAIL 0.5	Belleville, IL

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, 8.1 hours before the alert went out and 231 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.

259 
WUUS53 KLSX 170808
SVRLSX
ILC119-163-MOC099-189-510-170845-
/O.NEW.KLSX.SV.W.0005.120117T0808Z-120117T0845Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 245 AM CST

* AT 206 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
  EUREKA...AND MOVING EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BALLWIN...MURPHY...MANCHESTER...VALLEY PARK...FENTON...TOWN AND
  COUNTRY...DES PERES...SUNSET HILLS...KIRKWOOD...FRONTENAC...
  CRESTWOOD...OAKLAND...WARSON WOODS...GLENDALE...LADUE...WEBSTER
  GROVES...LAKESHIRE...MEHLVILLE...AFFTON AND BRENTWOOD.

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 3849 8998 3846 9019 3852 9026 3845 9029
      3839 9063 3857 9070 3876 9006
TIME...MOT...LOC 0808Z 253DEG 49KT 3851 9056
WIND...HAIL 60MPH 1.00IN

$$

TRUETT

1 follow-up statement

910 
WWUS53 KLSX 170846
SVSLSX

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

ILC119-163-MOC099-189-510-170855-
/O.EXP.KLSX.SV.W.0005.000000T0000Z-120117T0845Z/
MADISON IL-ST. CLAIR IL-JEFFERSON MO-ST. LOUIS MO-ST. LOUIS CITY MO-
246 AM CST TUE JAN 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR ST. LOUIS CITY...SOUTHERN ST.
LOUIS...NORTHEASTERN JEFFERSON...NORTHWESTERN ST. CLAIR AND
SOUTHWESTERN MADISON COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.    HOWEVER...A TORNADO WARNING IS IN EFFECT FOR EXTREME 
SOUTHERN ST LOUIS COUNTY FOR ANOTHER INTENSE THUNDERSTORM MOVING 
THAT DIRECTION FROM JEFFERSON COUNTY.

LAT...LON 3849 8998 3846 9019 3852 9026 3845 9029
      3839 9063 3857 9070 3876 9006
TIME...MOT...LOC 0808Z 253DEG 49KT 3851 9056

$$

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, 12:39 AM CST	Tornado Warning	LSX	Gasconade, Osage	36 min
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, 2:12 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
Jan 17, 2:17 AM CST	Severe Thunderstorm Warning	LSX	Madison	28 min
Jan 17, 2:38 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Madison, Saint Clair	52 min
Jan 17, 2:39 AM CST	Severe Thunderstorm Warning	LSX	Bond	36 min
Jan 17, 3:07 AM CST	Tornado Warning	LSX	Clinton, Monroe, Saint Clair, Washington	38 min
Jan 17, 3:23 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion	35 min
Jan 17, 3:46 AM CST	Tornado Warning	LSX	Clinton, Washington	29 min
Jan 17, 5:14 AM CST	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison, Saint Clair	46 min
Jan 17, 5:47 AM CST	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion	43 min
Jan 17, 5:53 AM CST	Severe Thunderstorm Warning	LSX	Monroe, Randolph, Saint Clair, Washington	52 min
Jan 17, 6:35 AM CST	Severe Thunderstorm Warning	LSX	Randolph	25 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2012 Severe Thunderstorm Warnings in Illinois, 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.