Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 166, NWS St. Louis, MO

May 13, 2011Saint Francois County, Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 13, 2011, 2:04 PM CDT for Saint Francois County, Washington County, Missouri. It was in force for 41 min. 6 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: May 13, 2011, 2:04 PM CDT (19:04 UTC)
Expired: May 13, 2011, 2:45 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Saint Francois County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 19:05 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 13, 2:20 PM CDT	HAIL 0.75	Potosi, MO
May 13, 2:21 PM CDT	HAIL 1	2 Ese Potosi, MO
May 13, 2:24 PM CDT	HAIL 1.5	2 Ese Potosi, MO	SOME HAIL UP TO PING PONG BALL SIZE. HAIL COVERING THE GROUND.
May 13, 2:34 PM CDT	HAIL 0.88	2 Se Mineral Point, MO
May 13, 2:52 PM CDT	HAIL 0.25	2 Nnw Bonne Terre, MO	JUST BEGAN HAILING.
May 13, 2:54 PM CDT	HAIL 0.25	Bonne Terre, MO

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

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 7.1 hours before the alert went out and 300 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: 354 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 755 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

498 
WUUS53 KLSX 131904
SVRLSX
MOC187-221-131945-
/O.NEW.KLSX.SV.W.0166.110513T1904Z-110513T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
204 PM CDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. FRANCOIS COUNTY IN SOUTHEAST MISSOURI...
  SOUTHERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 245 PM CDT

* AT 202 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 7 MILES
  SOUTHWEST OF POTOSI...AND MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  POTOSI...BONNE TERRE...MINERAL POINT...OLD MINES...CADET AND
  BLACKWELL.

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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3788 9102 3811 9069 3809 9068 3810 9065
      3809 9066 3807 9061 3802 9061 3801 9063
      3800 9058 3801 9055 3795 9048 3775 9088
TIME...MOT...LOC 1903Z 232DEG 12KT 3786 9085
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

2 follow-up statements

385 
WWUS53 KLSX 131917
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
217 PM CDT FRI MAY 13 2011

MOC187-221-131945-
/O.CON.KLSX.SV.W.0166.000000T0000Z-110513T1945Z/
ST. FRANCOIS MO-WASHINGTON MO-
217 PM CDT FRI MAY 13 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
WASHINGTON AND ST. FRANCOIS COUNTIES UNTIL 245 PM CDT...

AT 213 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
POTOSI...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  POTOSI...BONNE TERRE...MINERAL POINT...OLD MINES...CADET AND
  BLACKWELL.

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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3794 9094 3811 9069 3809 9068 3810 9066
      3808 9065 3807 9061 3802 9061 3801 9063
      3800 9058 3801 9055 3795 9048 3779 9080
TIME...MOT...LOC 1917Z 232DEG 12KT 3789 9080
WIND...HAIL 60MPH 1.00IN

$$

KANOFSKY

861 
WWUS53 KLSX 131947
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
247 PM CDT FRI MAY 13 2011

MOC187-221-131957-
/O.EXP.KLSX.SV.W.0166.000000T0000Z-110513T1945Z/
ST. FRANCOIS MO-WASHINGTON MO-
247 PM CDT FRI MAY 13 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WASHINGTON AND
ST. FRANCOIS COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. HOWEVER A NEW WARNING HAS BEEN ISSUED FOR NORTHERN ST. 
FRANCOIS COUNTY.

LAT...LON 3794 9094 3811 9069 3809 9068 3810 9066
      3808 9065 3807 9061 3802 9061 3801 9063
      3800 9058 3801 9055 3795 9048 3779 9080
TIME...MOT...LOC 1917Z 232DEG 12KT 3789 9080

$$

KANOFSKY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 7:43 PM CDT	Severe Thunderstorm Warning	LSX	Boone	47 min
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, 2:39 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.