Alert archive / Missouri / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 40, NWS St. Louis, MO

April 30, 2016Lincoln County, Saint Charles County, Missouri; Calhoun County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 30, 2016, 5:49 PM CDT for Lincoln County, Saint Charles County, Missouri; Calhoun County, Illinois. It was in force for 41 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
Apr 30, 2016, 5:49 PM CDT (22:49 UTC)
Expired
Apr 30, 2016, 6:30 PM CDT
In force
41 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

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

The radar

The St Louis radar (KLSX), 25 km from the middle of the area, began a volume at 22:51 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

TimeReportWhereRemark
Apr 30, 5:51 PM CDTHAIL 0.75Flint Hill, MO
Apr 30, 5:55 PM CDTHAIL 1Wentzville, MODIME TO QUARTER SIZED HAIL.

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.

IssuedProductOfficeLasted
Apr 30, 3:59 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.8 hours before the alert went out and 220 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, Lincoln, IL at 12:00Z on 2016-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2016-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 217 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
464 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
217 m²/s²
0-3 km storm-relative helicity
253 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

091 
WUUS53 KLSX 302249
SVRLSX
ILC013-MOC113-183-302330-
/O.NEW.KLSX.SV.W.0040.160430T2249Z-160430T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
549 PM CDT SAT APR 30 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CALHOUN COUNTY IN SOUTHWESTERN ILLINOIS...
  NORTHWESTERN ST. CHARLES COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHEASTERN LINCOLN COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 630 PM CDT

* AT 549 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CHAIN OF
  ROCKS...MOVING EAST AT 15 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  O'FALLON...ST. CHARLES...ST. PETERS...WENTZVILLE...LAKE ST. LOUIS...
  DARDENNE PRAIRIE...COTTLEVILLE...ST. PAUL...MOSCOW MILLS...JOSEPHVILLE...
  FOUNTAIN N' LAKES...CHAIN OF ROCKS...HARVESTER...FLINT HILL...
  FORISTELL...OLD MONROE...BRUSSELS...MEPPEN...DEER PLAIN AND BEECHVILLE.

THIS INCLUDES INTERSTATE 70 IN MISSOURI BETWEEN EXITS 208 AND 229.
 
THIS ALSO INCLUDES  FIRST MISSOURI STATE CAPITOL HISTORIC SITE.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 3901 9058 3899 9057 3896 9053 3895 9052
      3896 9051 3896 9050 3877 9048 3875 9050
      3872 9094 3895 9094
TIME...MOT...LOC 2249Z 266DEG 15KT 3887 9082 

HAIL...1.00IN
WIND...60MPH
 
$$

TILLY
1 follow-up statement
715 
WWUS53 KLSX 302325
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
625 PM CDT SAT APR 30 2016

ILC013-MOC113-183-302335-
/O.EXP.KLSX.SV.W.0040.000000T0000Z-160430T2330Z/
CALHOUN IL-ST. CHARLES MO-LINCOLN MO-
625 PM CDT SAT APR 30 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CALHOUN...
NORTHWESTERN ST. CHARLES AND SOUTHEASTERN LINCOLN COUNTIES WILL
EXPIRE AT 630 PM CDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT FOR
SOUTHWESTERN ILLINOIS...AND EAST CENTRAL MISSOURI.

LAT...LON 3901 9058 3899 9057 3896 9053 3895 9052
      3896 9051 3896 9050 3877 9048 3875 9050
      3872 9094 3895 9094
TIME...MOT...LOC 2321Z 266DEG 15KT 3887 9082 

$$

TILLY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 10:21 AM CDTRiver Flood WarningLSXFranklin, Warren3 days
Apr 30, 10:21 AM CDTRiver Flood WarningLSXSaint Charles, Saint Louis3 days
Apr 30, 5:08 PM CDTSevere Thunderstorm WarningLSXLincoln17 min
Apr 30, 6:37 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis38 min
Apr 30, 6:38 PM CDTSevere Thunderstorm WarningLSXMarion52 min
Apr 30, 6:41 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis, City of Saint Louis49 min
Apr 30, 6:48 PM CDTSevere Thunderstorm WarningLSXFranklin, Lincoln, Saint Charles, Saint Louis, Warren42 min
Apr 30, 4:53 PM CDTSevere Thunderstorm WarningLSXAdams, Pike52 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2016Severe Thunderstorm Warnings in Illinois, 2016Every severe thunderstorm warning in 2016

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.