Alert archive / Missouri / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 494, NWS St. Louis, MO

August 19, 2011Boone County, Moniteau County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 19, 2011, 1:14 AM CDT for Boone County, Moniteau County, Missouri. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 19, 2011, 1:14 AM CDT (06:14 UTC)
Expired
Aug 19, 2011, 2:00 AM CDT
In force
46 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Boone County, MO, Moniteau County, MO

The radar

The Pleasant Hill radar (KEAX), 145 km from the middle of the area, began a volume at 06:18 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 19, 1:08 AM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.2 hours before the alert went out and 231 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2011-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3816 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2011-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
3816 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1273 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
1.6
Supercell composite
11.7

Open this sounding in Storm Lab

The text

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

463 
WUUS53 KLSX 190614
SVRLSX
MOC019-135-190700-
/O.NEW.KLSX.SV.W.0494.110819T0614Z-110819T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
114 AM CDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWEST BOONE COUNTY IN CENTRAL MISSOURI...
  MONITEAU COUNTY IN CENTRAL MISSOURI...

* UNTIL 200 AM CDT

* AT 108 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 MARSHALL TO 15 MILES SOUTHWEST OF SEDALIA...AND     
  MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TIPTON...CALIFORNIA...COLUMBIA...CLARKSBURG...ROCHEPORT...HIGH
  POINT...JAMESTOWN...MCGIRK...EASLEY...MIDWAY...LATHAM...KLIEVER...
  LUPUS...SANDY HOOK...MCBAINE AND ENON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE 
ACROSS MUCH OF NORTHWEST MISSOURI. THIS IS AN EXTREMELY DANGEROUS 
SITUATION WITH TORNADO LIKE WIND SPEEDS EXPECTED. MOBILE HOMES AND 
HIGH PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO WINDS OF THIS 
MAGNITUDE AND MAY BE OVERTURNED. FOR YOUR PROTECTION MOVE TO AN 
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. THESE 
STORMS HAVE THE POTENTIAL TO CAUSE SERIOUS INJURY AND SIGNIFICANT 
DAMAGE TO PROPERTY.

&&

LAT...LON 3868 9285 3869 9278 3869 9262 3891 9251
      3893 9251 3897 9257 3899 9256 3898 9232
      3874 9238 3874 9239 3842 9249 3843 9263
      3860 9285
TIME...MOT...LOC 0612Z 275DEG 38KT 3889 9313 3871 9305
          3853 9319
WIND...HAIL 70MPH <.75IN

$$

CVKING
1 follow-up statement
624 
WWUS53 KLSX 190646
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
146 AM CDT FRI AUG 19 2011

MOC019-135-190700-
/O.CON.KLSX.SV.W.0494.000000T0000Z-110819T0700Z/
BOONE MO-MONITEAU MO-
146 AM CDT FRI AUG 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MONITEAU AND
WEST CENTRAL BOONE COUNTIES UNTIL 200 AM CDT...

AT 140 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 NORTHEAST OF BUNCETON TO CLARKSBURG TO 6 MILES
NORTHEAST OF VERSAILLES...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  CALIFORNIA...ROCHEPORT...HIGH POINT...MCGIRK...JAMESTOWN...
  MIDWAY...EASLEY...KLIEVER...SANDY HOOK...LUPUS...ENON AND MCBAINE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
NORTHWEST AND WEST CENTRAL MISSOURI.  THIS IS AN EXTREMELY DANGEROUS 
SITUATION WITH TORNADO LIKE WIND SPEEDS EXPECTED. MOBILE HOMES AND 
HIGH PROFILE VEHICLES ARE ESPECIALLY SUSCEPTIBLE TO WINDS OF THIS 
MAGNITUDE AND MAY BE OVERTURNED. MOVE IMMEDIATELY TO A STURDY 
BUILDING AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3868 9285 3869 9278 3869 9262 3891 9251
      3893 9251 3897 9257 3899 9256 3898 9232
      3874 9238 3874 9239 3842 9249 3843 9263
      3860 9285
TIME...MOT...LOC 0644Z 275DEG 38KT 3886 9267 3868 9259
          3850 9273
WIND...HAIL 70MPH <.75IN

$$

GKS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 2:01 AM CDTSevere Thunderstorm WarningLSXBoone, Callaway, Cole, Moniteau, Osage44 min
Aug 19, 2:34 AM CDTSevere Thunderstorm WarningLSXCallaway, Cole, Crawford, Franklin, Gasconade, Montgomery and 2 more41 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.