Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 418, NWS St. Louis, MO

June 27, 201111 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 27, 2011, 2:17 AM CDT for 11 counties in Missouri. It was in force for 43 min. 7 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 27, 2011, 2:17 AM CDT (07:17 UTC)
Expired: Jun 27, 2011, 3:00 AM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 07:16 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
Jun 27, 2:22 AM CDT	TSTM WND GST 65	Drake, MO
Jun 27, 2:27 AM CDT	TSTM WND GST 45	Dutzow, MO
Jun 27, 2:33 AM CDT	TSTM WND GST 65	Drake, MO
Jun 27, 2:39 AM CDT	TSTM WND GST 63	4 Sw Fenton, MO
Jun 27, 2:42 AM CDT	TSTM WND GST 65	Gray Summit, MO
Jun 27, 2:42 AM CDT	HAIL 1	Gray Summit, MO
Jun 27, 2:45 AM CDT	HAIL 0.25	Chesterfield, MO

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 27, 1:32 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 7.3 hours before the alert went out and 272 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: 2297 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1632 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

284 
WUUS53 KLSX 270717
SVRLSX
MOC027-055-071-073-099-139-151-183-189-219-221-270800-
/O.NEW.KLSX.SV.W.0418.110627T0717Z-110627T0800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
217 AM CDT MON JUN 27 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CALLAWAY COUNTY IN CENTRAL MISSOURI...
  NORTHERN CRAWFORD COUNTY IN EAST CENTRAL MISSOURI...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...
  EASTERN OSAGE COUNTY IN CENTRAL MISSOURI...
  SOUTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN WARREN COUNTY IN EAST CENTRAL MISSOURI...
  NORTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 300 AM CDT

* AT 216 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 6 MILES SOUTH OF WRIGHT CITY TO LINN...AND MOVING
  EAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NEW HAVEN...WASHINGTON...OWENSVILLE...CHESTERFIELD...CLARKSON
  VALLEY...WILDWOOD...UNION...ELLISVILLE...GRAY SUMMIT...VILLA
  RIDGE...BALLWIN...MANCHESTER...PACIFIC...EUREKA...TOWN AND
  COUNTRY...CREVE COEUR...VALLEY PARK...DES PERES...ST. CLAIR AND
  FRONTENAC.

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 3880 9174 3868 9030 3844 9034 3802 9127
      3820 9165 3828 9165 3829 9186 3835 9199
TIME...MOT...LOC 0717Z 283DEG 23KT 3873 9103 3845 9189
WIND...HAIL 70MPH <.75IN

$$

TRUETT

1 follow-up statement

794 
WWUS53 KLSX 270749
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
249 AM CDT MON JUN 27 2011

MOC027-073-139-151-183-219-270758-
/O.CAN.KLSX.SV.W.0418.000000T0000Z-110627T0800Z/
CALLAWAY MO-GASCONADE MO-MONTGOMERY MO-OSAGE MO-ST. CHARLES MO-
WARREN MO-
249 AM CDT MON JUN 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WARREN...SOUTHWESTERN
ST. CHARLES...EASTERN OSAGE...SOUTHERN MONTGOMERY...GASCONADE AND
EAST CENTRAL CALLAWAY COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS MOVED OUT OF
THE WARNED AREA.  HOWEVER...ADDITIONAL STRONG THUNDERSTORMS ARE 
POSSIBLE...AND A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 9 
AM.

LAT...LON 3815 9154 3821 9140 3821 9137 3823 9137
      3855 9067 3844 9034 3802 9127
TIME...MOT...LOC 0748Z 319DEG 40KT 3851 9075 3823 9161

$$

MOC055-071-099-189-221-270800-
/O.CON.KLSX.SV.W.0418.000000T0000Z-110627T0800Z/
CRAWFORD MO-FRANKLIN MO-JEFFERSON MO-ST. LOUIS MO-WASHINGTON MO-
249 AM CDT MON JUN 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
WASHINGTON...SOUTHWESTERN ST. LOUIS...NORTHERN JEFFERSON...SOUTHERN
FRANKLIN AND NORTHERN CRAWFORD COUNTIES UNTIL 300 AM CDT...

AT 244 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 GRAY SUMMIT TO BLAND...MOVING
SOUTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  PACIFIC...EUREKA...ST. CLAIR...SULLIVAN...CEDAR HILL...BOURBON...
  BYRNES MILL...HIGH RIDGE...ARNOLD...PARKWAY...LONEDELL...DITTMER...
  HOUSE SPRINGS...LEASBURG...CATAWISSA...MOSELLE...ROBERTSVILLE...
  JAPAN...STANTON AND PINEY PARK.

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 3815 9154 3821 9140 3821 9137 3823 9137
      3855 9067 3844 9034 3802 9127
TIME...MOT...LOC 0748Z 319DEG 40KT 3851 9075 3823 9161
WIND...HAIL 60MPH 1.00IN

$$

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Warren	14 min
Jun 26, 7:26 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Gasconade, Montgomery, Osage	38 min
Jun 26, 8:28 PM CDT	River Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	65 days
Jun 26, 8:30 PM CDT	Flash Flood Warning	LSX	Knox, Lewis	12 hr
Jun 26, 8:34 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	41 min
Jun 26, 9:09 PM CDT	River Flood Warning	LSX	Lewis	4 days
Jun 26, 9:09 PM CDT	River Flood Warning	LSX	Marion	5 days
Jun 26, 9:16 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	59 min
Jun 27, 12:11 AM CDT	Severe Thunderstorm Warning	LSX	Knox	19 min
Jun 27, 12:26 AM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Marion, Monroe, Ralls, Shelby	49 min
Jun 27, 12:52 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway, Monroe, Montgomery, Pike and 1 more	53 min
Jun 27, 12:55 AM CDT	Tornado Warning	LSX	Marion, Monroe, Ralls, Shelby	20 min
Jun 27, 1:08 AM CDT	Tornado Warning	LSX	Marion, Monroe, Pike, Ralls	37 min
Jun 27, 1:13 AM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	62 min
Jun 27, 1:27 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Callaway, Lincoln, Montgomery, Pike, Saint Charles and 1 more	63 min
Jun 27, 1:43 AM CDT	Tornado Warning	LSX	Pike	32 min
Jun 27, 2:04 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Saint Louis	41 min
Jun 27, 2:42 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis	48 min
Jun 27, 3:01 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Sainte Genevieve, Saint Francois, Washington	29 min
Jun 27, 3:14 AM CDT	River Flood Warning	LSX	Marion	4 days
Jun 27, 4:18 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau, Osage	23 min
Jun 27, 8:22 AM CDT	Areal Flood Warning	LSX	Knox, Lewis	12 hr
Jun 27, 8:25 AM CDT	River Flood Warning	LSX	Marion	4 days
Jun 27, 3:11 PM CDT	River Flood Warning	LSX	Franklin, Warren	22 days
Jun 27, 3:11 PM CDT	River Flood Warning	LSX	Saint Charles, Saint Louis	44 days
Jun 27, 5:19 PM CDT	River Flood Warning	LSX	Lincoln	18 hr

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.