Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 191, NWS St. Louis, MO

May 22, 20114 counties in Missouri; Calhoun County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 22, 2011, 7:45 PM CDT for 4 counties in Missouri; Calhoun County, Illinois. It was in force for 45 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 22, 2011, 7:45 PM CDT (00:45 UTC)
Expired: May 22, 2011, 8:30 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, IL, Franklin County, MO, Lincoln County, MO, Saint Charles County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 33 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 22, 8:06 PM CDT	HAIL 1	Warrenton, MO	AT I70

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

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.8 hours before the alert went out and 261 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.

081 
WUUS53 KLSX 230045
SVRLSX
ILC013-MOC071-113-183-219-230130-
/O.NEW.KLSX.SV.W.0191.110523T0045Z-110523T0130Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  WARREN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 830 PM CDT

* AT 740 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 5 MILES EAST OF MOSCOW MILLS TO
  7 MILES SOUTHEAST OF HERMANN...AND MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WENTZVILLE...ST. PAUL...LAKE ST. LOUIS...O'FALLON...DARDENNE
  PRAIRIE...COTTLEVILLE...ST. PETERS...ST. CHARLES...WELDON SPRING...
  TRELOAR...MARTHASVILLE...NEW MELLE...DUTZOW...ORCHARD FARMS...
  HARVESTER...DEFIANCE...OLD MONROE...HOLSTEIN...GOLDEN EAGLE AND
  DEER PLAIN.

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 3896 9091 3891 9030 3858 9084 3863 9137
      3870 9137 3870 9138 3871 9138
TIME...MOT...LOC 0045Z 280DEG 45KT 3891 9075 3865 9125
WIND...HAIL 60MPH 1.00IN

$$

CVKING

2 follow-up statements

442 
WWUS53 KLSX 230107
SVSLSX

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

ILC013-MOC071-113-183-219-230130-
/O.CON.KLSX.SV.W.0191.000000T0000Z-110523T0130Z/
CALHOUN IL-FRANKLIN MO-LINCOLN MO-ST. CHARLES MO-WARREN MO-
807 PM CDT SUN MAY 22 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WARREN...ST.
CHARLES...SOUTHEASTERN LINCOLN...NORTHWESTERN FRANKLIN AND SOUTHERN
CALHOUN COUNTIES UNTIL 830 PM CDT...

AT 803 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM ORCHARD FARMS TO TRELOAR...MOVING
EAST AT 40 MPH.

SPOTTERS REPORTED QUARTER SIZE HAIL IN WARRENTON AROUND 8 PM.

LOCATIONS IMPACTED INCLUDE...
  DARDENNE PRAIRIE...ST. PETERS...COTTLEVILLE...ST. CHARLES...WELDON
  SPRING...MARTHASVILLE...DUTZOW...HARVESTER AND DEFIANCE.

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 3896 9091 3891 9030 3858 9084 3863 9137
      3870 9137 3870 9138 3871 9138
TIME...MOT...LOC 0107Z 285DEG 33KT 3889 9042 3862 9109
WIND...HAIL 60MPH 1.00IN

$$

CVKING

896 
WWUS53 KLSX 230121
SVSLSX

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

ILC013-MOC071-113-183-219-230131-
/O.EXP.KLSX.SV.W.0191.000000T0000Z-110523T0130Z/
CALHOUN IL-FRANKLIN MO-LINCOLN MO-ST. CHARLES MO-WARREN MO-
821 PM CDT SUN MAY 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR WARREN...ST. CHARLES...
SOUTHEASTERN LINCOLN...NORTHWESTERN FRANKLIN AND SOUTHERN CALHOUN
COUNTIES WILL EXPIRE AT 830 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THESE
THUNDERSTORMS.

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

LAT...LON 3896 9091 3891 9030 3858 9084 3863 9137
      3870 9137 3870 9138 3871 9138
TIME...MOT...LOC 0121Z 285DEG 33KT 3885 9026 3859 9093

$$

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, 7:56 PM CDT	Areal Flood Advisory	LSX	Callaway, Cole, Gasconade, Montgomery, Osage	6 hr
May 22, 8:01 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Saint Charles	29 min
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
May 22, 7:51 PM CDT	Tornado Warning	LSX	Calhoun, Jersey	39 min
May 22, 8:08 PM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey, Macoupin	41 min
May 23, 12:42 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Jersey, Macoupin, Madison, Montgomery and 1 more	48 min
May 23, 1:14 PM CDT	Areal Flood Advisory	LSX	Bond, Clinton	4 hr
May 23, 1:26 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Montgomery	49 min
May 23, 1:32 PM CDT	Areal Flood Advisory	LSX	Fayette, Marion, Washington	4 hr
May 23, 2:15 PM CDT	Severe Thunderstorm Warning	LSX	Marion	16 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2011 Severe Thunderstorm Warnings in Illinois, 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.