Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 445, NWS St. Louis, MO

July 3, 2011Lincoln County, Saint Charles County, Saint Louis County, Missouri; Calhoun County, Jersey County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 3, 2011, 3:56 PM CDT for Lincoln County, Saint Charles County, Saint Louis County, Missouri; Calhoun County, Jersey County, Illinois. It was in force for 49 min. 2 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: Jul 3, 2011, 3:56 PM CDT (20:56 UTC)
Expired: Jul 3, 2011, 4:45 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Calhoun County, IL, Jersey County, IL, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 31 km from the middle of the area, began a volume at 21:00 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
Jul 3, 4:27 PM CDT	TSTM WND GST 44	Harvester, MO
Jul 3, 4:28 PM CDT	TSTM WND GST 65	O'Fallon, MO	SPOTTER LOCATED AT T.R. HUGHES PARK

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
Jul 3, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.9 hours before the alert went out and 216 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: 1911 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

928 
WUUS53 KLSX 032056
SVRLSX
ILC013-083-MOC113-183-189-032145-
/O.NEW.KLSX.SV.W.0445.110703T2056Z-110703T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
356 PM CDT SUN JUL 3 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALHOUN COUNTY IN SOUTHWEST ILLINOIS...
  WESTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS...
  SOUTHEASTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...
  CENTRAL ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 445 PM CDT

* AT 351 PM 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 DAVIS TO MOSCOW MILLS TO DUTZOW...AND MOVING EAST AT
  40 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  LAKE ST. LOUIS...ST. PAUL...DARDENNE PRAIRIE...O'FALLON...
  COTTLEVILLE...WELDON SPRING...ST. PETERS...CHESTERFIELD...ST.
  CHARLES...MARYLAND HEIGHTS...BRIDGETON...ST. ANN...WOODSON
  TERRACE...HAZELWOOD...BERKELEY...KINLOCH...FLORISSANT...COOL
  VALLEY...FERGUSON AND DEFIANCE.

LAT...LON 3916 9049 3918 9049 3918 9046 3904 9027
      3873 9028 3861 9073 3863 9074 3861 9076
      3860 9080 3891 9080 3907 9099 3916 9061
      3912 9060 3917 9058 3919 9051
TIME...MOT...LOC 2056Z 254DEG 37KT 3905 9100 3891 9087
          3865 9090
WIND...HAIL 70MPH 0.75IN

$$

CVKING

2 follow-up statements

813 
WWUS53 KLSX 032135
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
435 PM CDT SUN JUL 3 2011

ILC013-083-MOC113-183-189-032145-
/O.CON.KLSX.SV.W.0445.000000T0000Z-110703T2145Z/
JERSEY IL-CALHOUN IL-LINCOLN MO-ST. CHARLES MO-ST. LOUIS MO-
435 PM CDT SUN JUL 3 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN ST.
LOUIS...CENTRAL ST. CHARLES...EAST CENTRAL LINCOLN...CALHOUN AND
WESTERN JERSEY COUNTIES UNTIL 445 PM CDT...

AT 429 PM 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 WINFIELD TO 6 MILES NORTHEAST OF ST. PAUL TO WELDON
SPRING...MOVING EAST AT 45 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY 
THESE DAMAGING WINDS.

WIND GUSTS BETWEEN 60 AND 70 MPH HAVE BEEN OBSERVED BY TRAINED 
SPOTTERS. THIS STORM HAS A HISTORY OF PRODUCING STRAIGHT LINE WIND 
DAMAGE WITH MANY TREES AND POWER LINES DOWNED IN WARREN COUNTY.

LOCATIONS IMPACTED INCLUDE...
  CHESTERFIELD...ST. CHARLES...MARYLAND HEIGHTS...BRIDGETON...ST.
  ANN...HAZELWOOD...WOODSON TERRACE...ST. JOHN...BERKELEY...
  FLORISSANT...KINLOCH...COOL VALLEY...FERGUSON...HARVESTER...ORCHARD
  FARMS...GRAFTON...ELSAH...PORTAGE DES SIOUX...BATCHTOWN AND MEPPEN.

LAT...LON 3916 9049 3918 9049 3918 9046 3904 9027
      3873 9028 3861 9073 3863 9074 3861 9076
      3860 9080 3891 9080 3907 9099 3916 9061
      3912 9060 3917 9058 3919 9051
TIME...MOT...LOC 2134Z 254DEG 37KT 3907 9072 3893 9059
          3867 9062
WIND...HAIL 70MPH 0.75IN

$$

CVKING

970 
WWUS53 KLSX 032143
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
443 PM CDT SUN JUL 3 2011

ILC013-083-MOC113-183-189-032153-
/O.EXP.KLSX.SV.W.0445.000000T0000Z-110703T2145Z/
JERSEY IL-CALHOUN IL-LINCOLN MO-ST. CHARLES MO-ST. LOUIS MO-
443 PM CDT SUN JUL 3 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ST. LOUIS...CENTRAL
ST. CHARLES...EAST CENTRAL LINCOLN...CALHOUN AND WESTERN JERSEY
COUNTIES WILL EXPIRE AT 445 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 GUSTY WINDS ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8 PM.

LAT...LON 3916 9049 3918 9049 3918 9046 3904 9027
      3873 9028 3861 9073 3863 9074 3861 9076
      3860 9080 3891 9080 3907 9099 3916 9061
      3912 9060 3917 9058 3919 9051
TIME...MOT...LOC 2143Z 254DEG 37KT 3910 9060 3896 9048
          3870 9051

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 1:18 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade	42 min
Jul 3, 1:29 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren	46 min
Jul 3, 1:29 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Washington	46 min
Jul 3, 1:41 PM CDT	Severe Thunderstorm Warning	LSX	Boone	49 min
Jul 3, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	51 min
Jul 3, 2:02 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway	58 min
Jul 3, 2:12 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis	48 min
Jul 3, 2:13 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	47 min
Jul 3, 2:16 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	44 min
Jul 3, 2:22 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois	20 min
Jul 3, 2:24 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Warren	51 min
Jul 3, 2:29 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	46 min
Jul 3, 2:33 PM CDT	Severe Thunderstorm Warning	LSX	Callaway	42 min
Jul 3, 2:34 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	26 min
Jul 3, 2:50 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Warren, City of Saint Louis	40 min
Jul 3, 2:51 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Osage	24 min
Jul 3, 2:55 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Franklin, Gasconade, Montgomery, Warren	35 min
Jul 3, 3:05 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Gasconade, Montgomery, Osage	25 min
Jul 3, 3:24 PM CDT	Areal Flood Advisory	LSX	Sainte Genevieve, Saint Louis	6 hr
Jul 3, 3:26 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Franklin, Gasconade, Lincoln, Montgomery, Osage and 2 more	64 min
Jul 3, 4:34 PM CDT	Areal Flood Advisory	LSX	Franklin, Lincoln, Saint Charles, Warren	5 hr
Jul 3, 5:25 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	35 min
Jul 3, 1:31 PM CDT	Severe Thunderstorm Warning	LSX	Randolph, Saint Clair, Washington	44 min
Jul 3, 2:39 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Monroe, Randolph, Saint Clair, Washington	21 min
Jul 3, 3:00 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Monroe, Randolph, Saint Clair, Washington	45 min
Jul 3, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton	30 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.