Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 196, NWS St. Louis, MO

May 23, 20118 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 23, 2011, 11:41 AM CDT for 8 counties in Missouri. It was in force for 49 min. 23 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: May 23, 2011, 11:41 AM CDT (16:41 UTC)
Expired: May 23, 2011, 12:30 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 16:44 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 23, 11:50 AM CDT	TSTM WND GST 49	1 Nne Sullivan, MO	43 KT GUST AT KUUV
May 23, 11:50 AM CDT	TSTM WND GST 60	6 Wnw New Haven, MO	POWER OUT IN THE BERGER AREA ALONG WITH PEA SIZE HAIL
May 23, 11:54 AM CDT	TSTM WND GST 45	Beaufort, MO
May 23, 11:55 AM CDT	TSTM WND DMG	Gerald, MO	A FEW SHINGLES BLOWN OFF OF SOME ROOFS.
May 23, 11:58 AM CDT	TSTM WND GST 55	Union, MO
May 23, 11:59 AM CDT	TSTM WND DMG	Union, MO	6 TO 10 INCH DIAMETER LIMBS DOWN...PEA SIZE HAIL
May 23, 12:02 PM CDT	TSTM WND DMG	Union, MO	TREES DOWN ALONG INDEPENDENCE STREET IN DOWNTOWN UNION... RELAYED BY AMATEUR RADIO.
May 23, 12:04 PM CDT	TSTM WND DMG	Washington, MO	SMALL TREE LIMBS DOWN. ESTIMATED WINDS OF 40 TO 50 MPH.
May 23, 12:05 PM CDT	TSTM WND GST 68	2 N Washington, MO
May 23, 12:06 PM CDT	TSTM WND DMG	Union, MO	HALL BROTHERS LUMBER HAS ROOFING BLOWN OFF.
May 23, 12:11 PM CDT	TSTM WND GST 60	2 Sw Lake St. Louis, MO	55 TO 60 MPH WINDS ESTIMATED WITH 9-INCH DIAMETER TREES BENT OVER AT A 90 DEGREE ANGLE. WINDS LASTED ABOUT 30 SECONDS.
May 23, 12:12 PM CDT	TSTM WND GST 60	Wentzville, MO	50 TO 60 MPH GUST AT WENTZVILLE PARKWAY AT WEST MEYER.
May 23, 12:14 PM CDT	TSTM WND GST 53	Weldon Spring, MO	MEASURED AT NWS ST LOUIS OFFICE
May 23, 12:16 PM CDT	TSTM WND DMG	O'Fallon, MO	NUMEROUS FINGER TO THUMB SIZE DIAMETER BRANCHES DOWN.
May 23, 12:18 PM CDT	TSTM WND GST 54	Weldon Spring, MO	WIND GUST AT THE NWS OFFICE.
May 23, 12:20 PM CDT	TSTM WND GST 51	3 W Chesterfield, MO	44KT GUST AT KSUS
May 23, 12:22 PM CDT	TSTM WND DMG	Union, MO	NUMEROUS TREES AND AT LEAST ONE POWER LINE DOWN IN TOWN.
May 23, 12:23 PM CDT	TSTM WND GST 70	6 Nne Gray Summit, MO	TREES UP TO 1 FOOT IN DIAMETER SNAPPED
May 23, 12:24 PM CDT	HAIL 0.5	Ballwin, MO	TRASH CANS WERE SENT AIRBORNE. NO LIMBS REPORTED DOWN.
May 23, 12:27 PM CDT	TSTM WND DMG	Chesterfield, MO	3 9-18 INCH TREES DOWN AT MEADOWBROOK COUNTRY CLUB NEAR CLAYTON AND KERRS MILL ROAD.
May 23, 12:27 PM CDT	TSTM WND GST 42	O'Fallon, MO	NORTHWEST SIDE OF OFALLON NEAR ST. PAUL
May 23, 12:29 PM CDT	TSTM WND DMG	Manchester, MO	LARGE LIMBS AND TREES DOWN AT 141 AND BIG BEND. ONE LANE OF SOUTHBOUND 141 BLOCKED.
May 23, 12:32 PM CDT	HAIL 1	Valley Park, MO	1 MILE WEST OF INTERSECTION OF BIG BEND AND 141.

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 23, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.7 hours before the alert went out and 284 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: 504 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1171 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

415 
WUUS53 KLSX 231641
SVRLSX
MOC055-071-073-099-183-189-219-221-231730-
/O.NEW.KLSX.SV.W.0196.110523T1641Z-110523T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1141 AM CDT MON MAY 23 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  WESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  WESTERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN WARREN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 1230 PM CDT

* AT 1140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM HERMANN TO 7 MILES SOUTHWEST OF NEW HAVEN TO 7 MILES SOUTHEAST
  OF GERALD TO CUBA...AND MOVING EAST AT 50 MPH. NICKEL SIZE HAIL MAY
  ALSO ACCOMPANY THESE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  BOURBON...NEW HAVEN...SULLIVAN...UNION...WASHINGTON...ST. CLAIR...
  VILLA RIDGE...GRAY SUMMIT...PACIFIC...WENTZVILLE...LAKE ST.
  LOUIS...WILDWOOD...EUREKA...DARDENNE PRAIRIE...O'FALLON...WELDON
  SPRING...ST. PAUL...ELLISVILLE...CLARKSON VALLEY AND COTTLEVILLE.

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 3800 9150 3830 9135 3849 9140 3868 9152
      3889 9062 3876 9048 3856 9044 3826 9059
TIME...MOT...LOC 1641Z 250DEG 44KT 3871 9142 3853 9128
          3833 9123 3812 9135
WIND...HAIL 60MPH 0.88IN

$$

BROWNING

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, 8:01 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, 11:43 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.