Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 339, NWS St. Louis, MO

June 18, 20116 counties in Illinois; 8 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 18, 2011, 5:18 AM CDT for 6 counties in Illinois; 8 counties in Missouri. It was in force for 57 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: Jun 18, 2011, 5:18 AM CDT (10:18 UTC)
Expired: Jun 18, 2011, 6:15 AM CDT
In force: 57 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 18 km from the middle of the area, began a volume at 10:20 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
Jun 18, 5:34 AM CDT	TSTM WND DMG	Flint Hill, MO	A COUPLE OF THREE INCH TREE LIMBS BLOWN DOWN.
Jun 18, 5:40 AM CDT	TSTM WND DMG	1 N O'Fallon, MO	FOUR INCH TREE LIMB BLOWN DOWN ONTO A PICKUP TRUCK.
Jun 18, 5:40 AM CDT	TSTM WND DMG	3 Nne O'Fallon, MO	TWELVE INCH DIAMETER TREE BLOWN DOWN.
Jun 18, 5:58 AM CDT	TSTM WND GST 50	Orchard Farms, MO
Jun 18, 6:00 AM CDT	TSTM WND GST 60	4 Nne Orchard Farms, MO	AT SMART FIELD.
Jun 18, 6:24 AM CDT	TSTM WND GST 70	Columbia, 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
Jun 18, 2:44 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 10.3 hours before the alert went out and 229 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: 601 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 644 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

044 
WUUS53 KLSX 181018
SVRLSX
ILC013-061-083-119-133-163-MOC071-099-113-163-183-189-219-510-181115-
/O.NEW.KLSX.SV.W.0339.110618T1018Z-110618T1115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
518 AM CDT SAT JUN 18 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHWESTERN GREENE COUNTY IN SOUTHWEST ILLINOIS...
  JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  EASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN PIKE COUNTY IN NORTHEAST MISSOURI...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  EASTERN WARREN COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 615 AM CDT

* AT 515 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM BOWLING GREEN TO DAVIS TO NEW MELLE TO SULLIVAN...
  AND MOVING EAST AT 50 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE
  DAMAGING WINDS.

  NUMEROUS TREES AND POWER LINES HAVE BEEN REPORTED DOWNED BY THIS 
  LINE AS IT MOVED THROUGH MONTGOMERY COUNTY.

* LOCATIONS IMPACTED INCLUDE...
  WENTZVILLE...UNION...LAKE ST. LOUIS...ST. CLAIR...ST. PAUL...
  DARDENNE PRAIRIE...VILLA RIDGE...O'FALLON...ELSBERRY...GRAY
  SUMMIT...COTTLEVILLE...WELDON SPRING...ST. PETERS...PACIFIC...
  WILDWOOD...ST. CHARLES...CHESTERFIELD...CLARKSON VALLEY...EUREKA
  AND ELLISVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE. 
THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A 
STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3933 9040 3899 9013 3866 9012 3819 9029
      3820 9123 3871 9112 3899 9115 3934 9131
TIME...MOT...LOC 1016Z 265DEG 43KT 3935 9114 3903 9095
          3876 9091 3825 9118
WIND...HAIL 70MPH 0.75IN

$$

BRITT

3 follow-up statements

587 
WWUS53 KLSX 181037
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
537 AM CDT SAT JUN 18 2011

ILC013-061-083-119-133-163-MOC071-099-113-163-183-189-219-510-181115-
/O.CON.KLSX.SV.W.0339.000000T0000Z-110618T1115Z/
JERSEY IL-MADISON IL-MONROE IL-ST. CLAIR IL-CALHOUN IL-GREENE IL-
FRANKLIN MO-JEFFERSON MO-LINCOLN MO-PIKE MO-ST. CHARLES MO-
ST. LOUIS MO-WARREN MO-ST. LOUIS CITY MO-
537 AM CDT SAT JUN 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
GREENE...CALHOUN...NORTHWESTERN ST. CLAIR...NORTHWESTERN MONROE...
WESTERN MADISON AND JERSEY COUNTIES IN SOUTHWEST ILLINOIS...AND ST.
LOUIS CITY...EASTERN WARREN...ST. LOUIS...ST. CHARLES...LINCOLN...
NORTHERN JEFFERSON AND EASTERN FRANKLIN COUNTIES IN EAST CENTRAL
MISSOURI...AND SOUTHERN PIKE COUNTY IN NORTHEAST MISSOURI UNTIL 615
AM CDT...

AT 534 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM CLARKSVILLE TO WINFIELD TO
COTTLEVILLE TO 6 MILES SOUTHWEST OF LONEDELL...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  WILDWOOD...CHESTERFIELD...CLARKSON VALLEY...ST. CHARLES...EUREKA...
  ELLISVILLE...BALLWIN...MARYLAND HEIGHTS...CEDAR HILL...
  MANCHESTER...BRIDGETON...BYRNES MILL...TOWN AND COUNTRY...HIGH
  RIDGE...CREVE COEUR...VALLEY PARK...ST. ANN...HAZELWOOD...DES PERES
  AND MURPHY.

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 3933 9040 3899 9013 3866 9012 3819 9029
      3820 9123 3871 9112 3899 9115 3934 9131
TIME...MOT...LOC 1037Z 265DEG 43KT 3932 9088 3903 9067
          3877 9059 3825 9085
WIND...HAIL 70MPH 1.00IN

$$

BRITT

513 
WWUS53 KLSX 181050
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
550 AM CDT SAT JUN 18 2011

ILC013-061-083-119-133-163-MOC071-099-113-163-183-189-219-510-181115-
/O.CON.KLSX.SV.W.0339.000000T0000Z-110618T1115Z/
JERSEY IL-MADISON IL-MONROE IL-ST. CLAIR IL-CALHOUN IL-GREENE IL-
FRANKLIN MO-JEFFERSON MO-LINCOLN MO-PIKE MO-ST. CHARLES MO-
ST. LOUIS MO-WARREN MO-ST. LOUIS CITY MO-
550 AM CDT SAT JUN 18 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
GREENE...CALHOUN...NORTHWESTERN ST. CLAIR...NORTHWESTERN MONROE...
WESTERN MADISON AND JERSEY COUNTIES IN SOUTHWEST ILLINOIS...AND ST.
LOUIS CITY...EASTERN WARREN...ST. LOUIS...ST. CHARLES...LINCOLN...
NORTHERN JEFFERSON AND EASTERN FRANKLIN COUNTIES IN EAST CENTRAL
MISSOURI...AND SOUTHEASTERN PIKE COUNTY IN NORTHEAST MISSOURI UNTIL
615 AM CDT...

AT 548 AM 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 BELLEVIEW TO 8 MILES EAST OF
WINFIELD TO ST. CHARLES TO DITTMER...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CEDAR HILL...BRIDGETON...MANCHESTER...BYRNES MILL...TOWN AND
  COUNTRY...CREVE COEUR...HIGH RIDGE...VALLEY PARK...ST. ANN...
  HAZELWOOD...DES PERES...HILLSBORO...FRONTENAC...MURPHY...WOODSON
  TERRACE...OVERLAND...FENTON...OLIVETTE...BERKELEY AND KIRKWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

INTENSE SQUALL LINES CAN OCCASIONALLY PRODUCE BRIEF TORNADOES IN 
ADDITION TO WIDESPREAD SIGNIFICANT WIND DAMAGE. ALTHOUGH NOT 
IMMEDIATELY LIKELY...FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON 
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THIS STORM HAS THE 
POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 3933 9040 3899 9013 3866 9012 3819 9029
      3822 9109 3867 9100 3902 9108 3934 9129
TIME...MOT...LOC 1050Z 265DEG 38KT 3929 9076 3902 9058
          3878 9046 3833 9069
WIND...HAIL 60MPH 1.00IN

$$

BRITT

611 
WWUS53 KLSX 181116
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
616 AM CDT SAT JUN 18 2011

ILC013-061-083-119-133-163-MOC071-099-113-163-183-189-219-510-181123-
/O.EXP.KLSX.SV.W.0339.000000T0000Z-110618T1115Z/
JERSEY IL-MADISON IL-MONROE IL-ST. CLAIR IL-CALHOUN IL-GREENE IL-
FRANKLIN MO-JEFFERSON MO-LINCOLN MO-PIKE MO-ST. CHARLES MO-
ST. LOUIS MO-WARREN MO-ST. LOUIS CITY MO-
616 AM CDT SAT JUN 18 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GREENE...
CALHOUN...NORTHWESTERN ST. CLAIR...NORTHWESTERN MONROE...WESTERN
MADISON AND JERSEY COUNTIES IN SOUTHWEST ILLINOIS...AND ST. LOUIS
CITY...SOUTHEASTERN WARREN...ST. LOUIS...ST. CHARLES...LINCOLN...
NORTHERN JEFFERSON AND EASTERN FRANKLIN COUNTIES IN EAST CENTRAL
MISSOURI...AND SOUTHEASTERN PIKE COUNTY IN NORTHEAST MISSOURI WILL
EXPIRE AT 615 AM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE 
WARNED AREA.  THE LINE OF STORMS MAY CONTINUE TO PRODUCE UP TO 50 
MPH WINDS AND NICKEL SIZE HAIL AS IT MOVES EAST.  THE SEVERE 
THUNDERSTORM WARNING AS BEEN REISSUED UNTIL 700 AM CDT FOR PARTS OF 
JERSEY...MADISON...ST. CHARLES AND ST. LOUIS COUNTIES AS WELL AS ST. 
LOUIS CITY.

LAT...LON 3933 9040 3899 9013 3866 9012 3819 9029
      3822 9109 3867 9100 3902 9108 3934 9129
TIME...MOT...LOC 1113Z 265DEG 38KT 3931 9045 3904 9027
          3880 9015 3835 9038

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 12:30 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	45 min
Jun 18, 1:14 AM CDT	Flash Flood Warning	LSX	Macoupin, Montgomery	12 hr
Jun 18, 1:16 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	29 min
Jun 18, 2:51 AM CDT	Flash Flood Warning	LSX	Fayette, Montgomery	6 hr
Jun 18, 4:31 AM CDT	Flash Flood Warning	LSX	Bond, Fayette	6 hr
Jun 18, 5:01 AM CDT	Flash Flood Warning	LSX	Clinton, Marion	6 hr
Jun 18, 5:10 AM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Calhoun, Greene, Pike	65 min
Jun 18, 5:30 AM CDT	Tornado Warning	LSX	Calhoun, Greene, Jersey, Madison, Pike	19 min
Jun 18, 6:09 AM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison, Montgomery	51 min
Jun 18, 6:20 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Madison, Monroe, Randolph, Saint Clair, Washington	40 min
Jun 18, 6:21 AM CDT	Tornado Warning	LSX	Clinton, Monroe, Randolph, Saint Clair, Washington	39 min
Jun 18, 6:51 AM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison, Marion, Randolph and 2 more	54 min
Jun 18, 7:24 AM CDT	Severe Thunderstorm Warning	LSX	Clinton, Marion	30 min
Jun 18, 1:06 PM CDT	Areal Flood Warning	LSX	Macoupin, Montgomery	4 hr
Jun 18, 3:57 PM CDT	Flash Flood Watch	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	15 hr
Jun 18, 4:49 PM CDT	River Flood Warning	LSX	Fayette	5 days
Jun 18, 5:01 PM CDT	Areal Flood Warning	LSX	Macoupin, Montgomery	23 hr
Jun 18, 3:12 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Osage	63 min
Jun 18, 4:00 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Cole, Gasconade, Montgomery, Osage	45 min
Jun 18, 4:30 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Franklin, Gasconade, Lincoln, Montgomery and 4 more	60 min
Jun 18, 4:56 AM CDT	Tornado Warning	LSX	Lincoln, Montgomery, Saint Charles, Warren	49 min
Jun 18, 5:07 AM CDT	Tornado Warning	LSX	Lincoln, Montgomery, Pike	38 min
Jun 18, 5:50 AM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis, City of Saint Louis	3 hr
Jun 18, 7:28 AM CDT	Severe Thunderstorm Warning	LSX	Madison	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.