Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 438, NWS St. Louis, MO

July 3, 2011Monroe County, Saint Clair County, Illinois; 6 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 3, 2011, 2:50 PM CDT for Monroe County, Saint Clair County, Illinois; 6 counties in Missouri. It was in force for 40 min. 5 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, 2:50 PM CDT (19:50 UTC)
Expired: Jul 3, 2011, 3:30 PM CDT
In force: 40 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 14 km from the middle of the area, began a volume at 19:52 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, 2:52 PM CDT	HAIL 0.75	House Springs, MO
Jul 3, 3:00 PM CDT	TSTM WND DMG	2 W Eureka, MO	6 FLAGS SIGN NEAR INTERSTATE 44 DAMAGED BY HIGH WINDS. NUMEROUS 4-8 INCH DIAMETER LIMBS ALSO SNAPPED OFF
Jul 3, 3:13 PM CDT	HAIL 1	Mehlville, MO
Jul 3, 3:30 PM CDT	TSTM WND DMG	5 Wnw Belleville, IL	LARGE TREE DOWN BLOCKING HIGHWAY 157 BOTH DIRECTIOONS NEAR OLD ST. LOUIS ROAD...ALSO A TREE ON TRAILER NEAR THUNDERBIRD LANE.
Jul 3, 3:39 PM CDT	HAIL 0.25	5 Wnw Belleville, 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
Jul 3, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 236 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.

092 
WUUS53 KLSX 031950
SVRLSX
ILC133-163-MOC071-099-183-189-219-510-032030-
/O.NEW.KLSX.SV.W.0438.110703T1950Z-110703T2030Z/

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

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MONROE COUNTY IN SOUTHWEST ILLINOIS...
  NORTHWESTERN ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS...
  NORTHEASTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN WARREN COUNTY IN EAST CENTRAL MISSOURI...
  ST. LOUIS CITY IN EAST CENTRAL MISSOURI...

* UNTIL 330 PM CDT

* AT 248 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 NORTH OF TRELOAR TO
  AUGUSTA TO FOUNTAIN...AND MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  ARNOLD...MURPHY...OAKVILLE...WILDWOOD...FENTON...ELLISVILLE...
  VALLEY PARK...COLUMBIA...SUNSET HILLS...MEHLVILLE...BALLWIN...
  MANCHESTER...CLARKSON VALLEY...CRESTWOOD...LAKESHIRE...KIRKWOOD...
  WRIGHT CITY...AFFTON...DES PERES AND LEMAY.

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

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

&&

LAT...LON 3823 9032 3853 9121 3870 9132 3889 9094
      3888 9082 3892 9079 3878 9035 3872 9021
      3866 9018 3866 9006 3858 8989
TIME...MOT...LOC 1950Z 243DEG 17KT 3872 9121 3857 9080
          3838 9033
WIND...HAIL 60MPH 1.00IN

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 3:24 PM CDT	Areal Flood Advisory	LSX	Clinton, Marion, Monroe, Randolph, Saint Clair, Washington	6 hr
Jul 3, 3:45 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton	30 min
Jul 3, 3:56 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	49 min
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, 2:51 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, 3:26 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

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.