Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 192, NWS St. Louis, MO

May 22, 2011Franklin County, Gasconade County, Saint Charles County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 22, 2011, 8:01 PM CDT for Franklin County, Gasconade County, Saint Charles County, Missouri. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 22, 2011, 8:01 PM CDT (01:01 UTC)
Expired: May 22, 2011, 8:30 PM CDT
In force: 29 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, MO, Gasconade County, MO, Saint Charles County, MO

The radar

The St Louis radar (KLSX), 41 km from the middle of the area, began a volume at 01:03 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.

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 22, 12:51 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.0 hours before the alert went out and 280 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: 2469 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 952 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 319 m²/s²
Significant tornado parameter: 3.8
Supercell composite: 17.0

Open this sounding in Storm Lab

The text

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

699 
WUUS53 KLSX 230101
SVRLSX
MOC071-073-183-230130-
/O.NEW.KLSX.SV.W.0192.110523T0101Z-110523T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
801 PM CDT SUN MAY 22 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  EXTREME SOUTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 830 PM CDT

* AT 759 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A LINE OF SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE    
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS     
  LOCATED 6 MILES NORTH OF DRAKE...OR 10 MILES SOUTH OF              
  HERMANN...AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NEW HAVEN...WASHINGTON...GERALD...BEAUFORT...AUGUSTA...LESLIE...
  NOSER MILL AND LYON.

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 3863 9139 3861 9119 3860 9114 3861 9111
      3860 9103 3858 9103 3856 9100 3855 9097
      3859 9096 3858 9084 3836 9118 3837 9139
TIME...MOT...LOC 0100Z 275DEG 39KT 3855 9143
WIND...HAIL 60MPH 1.00IN

$$

CVKING

1 follow-up statement

908 
WWUS53 KLSX 230122
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
822 PM CDT SUN MAY 22 2011

MOC071-073-183-230132-
/O.EXP.KLSX.SV.W.0192.000000T0000Z-110523T0130Z/
FRANKLIN MO-GASCONADE MO-ST. CHARLES MO-
822 PM CDT SUN MAY 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME SOUTHWESTERN ST.
CHARLES...GASCONADE AND NORTHWESTERN FRANKLIN COUNTIES WILL EXPIRE AT
830 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 9 PM.

LAT...LON 3863 9139 3861 9119 3860 9114 3861 9111
      3860 9103 3858 9103 3856 9100 3855 9097
      3859 9096 3858 9084 3836 9118 3837 9139
TIME...MOT...LOC 0122Z 275DEG 39KT 3853 9113

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 7:10 PM CDT	Tornado Warning	LSX	Osage	20 min
May 22, 7:13 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Warren	47 min
May 22, 7:15 PM CDT	Tornado Warning	LSX	Franklin, Gasconade, Montgomery, Osage, Warren	45 min
May 22, 7:24 PM CDT	Tornado Warning	LSX	Lincoln	51 min
May 22, 7:42 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Gasconade, Osage	48 min
May 22, 7:45 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Lincoln, Saint Charles, Warren	45 min
May 22, 7:56 PM CDT	Areal Flood Advisory	LSX	Callaway, Cole, Gasconade, Montgomery, Osage	6 hr
May 22, 8:15 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	45 min
May 23, 12:34 AM CDT	River Flood Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren	66 hr
May 23, 2:02 AM CDT	Areal Flood Advisory	LSX	Callaway, Gasconade, Montgomery, Osage	6 hr
May 23, 10:56 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage, Washington	64 min
May 23, 11:22 AM CDT	Areal Flood Advisory	LSX	Boone, Callaway, Cole, Moniteau, Osage	3 hr
May 23, 11:41 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Jefferson, Saint Charles, Saint Louis and 2 more	49 min
May 23, 11:43 AM CDT	Areal Flood Advisory	LSX	Crawford, Gasconade, Montgomery	3 hr
May 23, 12:04 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more	41 min
May 23, 12:34 PM CDT	Areal Flood Advisory	LSX	Franklin, Lincoln, Saint Charles, Saint Louis, Warren, City of Saint Louis	3 hr
May 23, 12:53 PM CDT	Areal Flood Advisory	LSX	Jefferson	3 hr
May 23, 1:51 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	39 min
May 23, 2:30 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	45 min
May 23, 3:14 PM CDT	Severe Thunderstorm Warning	LSX	Madison	16 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.