Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 159, NWS St. Louis, MO

May 12, 2011Boone County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 12, 2011, 7:43 PM CDT for Boone County, Missouri. It was in force for 47 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: May 12, 2011, 7:43 PM CDT (00:43 UTC)
Expired: May 12, 2011, 8:30 PM CDT
In force: 47 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Boone County, MO

The radar

The St Louis radar (KLSX), 142 km from the middle of the area, began a volume at 00:45 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
May 12, 7:52 PM CDT	HAIL 0.25	Columbia, MO	ON THE BUSINESS LOOP... VFW HALL.

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
May 12, 5:31 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.7 hours before the alert went out and 267 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: 1521 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1233 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

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

788 
WUUS53 KLSX 130043
SVRLSX
MOC019-130130-
/O.NEW.KLSX.SV.W.0159.110513T0043Z-110513T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
743 PM CDT THU MAY 12 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BOONE COUNTY IN CENTRAL MISSOURI...

* UNTIL 830 PM CDT

* AT 741 PM CDT...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
  COLUMBIA...AND MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  COLUMBIA...CENTRALIA...MIDWAY...MURRY...HALLSVILLE AND STURGEON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3915 9240 3925 9233 3923 9211 3916 9211
      3903 9214 3896 9214 3890 9217 3889 9215
      3886 9216 3878 9238 3881 9238 3882 9239
      3882 9242 3894 9251
TIME...MOT...LOC 0042Z 214DEG 24KT 3891 9236
WIND...HAIL 60MPH 1.00IN

$$

MILLER

2 follow-up statements

829 
WWUS53 KLSX 130110
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
810 PM CDT THU MAY 12 2011

MOC019-130130-
/O.CON.KLSX.SV.W.0159.000000T0000Z-110513T0130Z/
BOONE MO-
810 PM CDT THU MAY 12 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
BOONE COUNTY UNTIL 830 PM CDT...

AT 805 PM CDT...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
MURRY...OR 7 MILES NORTHEAST OF COLUMBIA...MOVING NORTHEAST AT 30
MPH.

LOCATIONS IMPACTED INCLUDE...
  CENTRALIA...HALLSVILLE AND STURGEON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3925 9233 3923 9211 3916 9211 3898 9214
      3915 9240
TIME...MOT...LOC 0110Z 214DEG 24KT 3906 9223
WIND...HAIL 60MPH 1.00IN

$$

MILLER

677 
WWUS53 KLSX 130128
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
828 PM CDT THU MAY 12 2011

MOC019-130137-
/O.EXP.KLSX.SV.W.0159.000000T0000Z-110513T0130Z/
BOONE MO-
828 PM CDT THU MAY 12 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BOONE COUNTY WILL
EXPIRE AT 830 PM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1 AM.

LAT...LON 3925 9233 3923 9211 3916 9211 3898 9214
      3915 9240
TIME...MOT...LOC 0127Z 214DEG 24KT 3915 9215

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 7:51 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	24 min
May 12, 7:56 PM CDT	Severe Thunderstorm Warning	LSX	Cole	49 min
May 12, 8:13 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Monroe, Shelby	47 min
May 12, 8:41 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Shelby	49 min
May 12, 10:04 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	56 min
May 12, 10:50 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Jefferson, Washington	40 min
May 13, 10:27 AM CDT	River Flood Warning	LSX	Osage	6 hr
May 13, 2:04 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois, Washington	41 min
May 13, 2:39 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	51 min
May 13, 3:05 PM CDT	Tornado Warning	LSX	Sainte Genevieve, Saint Francois	20 min
May 13, 4:23 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve	23 min
May 13, 4:26 PM CDT	Areal Flood Advisory	LSX	Audrain, Boone, Callaway	4 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2011 Every severe thunderstorm warning 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.