Alert archive / Missouri / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 40, NWS St. Louis, MO

April 3, 2014Knox County, Lewis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 3, 2014, 6:34 PM CDT for Knox County, Lewis County, Missouri. 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 3, 2014, 6:34 PM CDT (23:34 UTC)
Expired: Apr 3, 2014, 7:15 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Knox County, MO, Lewis County, MO

The radar

The St Louis radar (KLSX), 185 km from the middle of the area, began a volume at 23:37 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
Apr 3, 6:37 PM CDT	HAIL 0.88	2 S La Belle, MO
Apr 3, 6:45 PM CDT	HAIL 0.7	La Belle, MO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.6 hours before the alert went out and 194 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 393 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 197 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.

867 
WUUS53 KLSX 032334
SVRLSX
MOC103-111-040015-
/O.NEW.KLSX.SV.W.0040.140403T2334Z-140404T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
634 PM CDT THU APR 3 2014

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN KNOX COUNTY IN NORTHEAST MISSOURI...
  LEWIS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 715 PM CDT

* AT 632 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST
  OF LA BELLE...AND MOVING NORTHEAST AT 50 MPH.

  HAZARD...HALF DOLLAR SIZE HAIL.

  SOURCE...TRAINED WEATHER SPOTTERS.

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED.

* LOCATIONS IMPACTED INCLUDE...
  KNOX CITY...LA BELLE...LEWISTOWN AND MONTICELLO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS PRODUCING LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4025 9150 4025 9149 4022 9150 3995 9195
      3995 9198 4007 9212 4026 9186
TIME...MOT...LOC 2334Z 229DEG 42KT 4007 9195

HAIL...1.25IN
WIND...<50MPH

$$

GKS

1 follow-up statement

370 
WWUS53 KLSX 032348
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
648 PM CDT THU APR 3 2014

MOC103-111-032358-
/O.CAN.KLSX.SV.W.0040.000000T0000Z-140404T0015Z/
KNOX MO-LEWIS MO-
648 PM CDT THU APR 3 2014

...THE SEVERE THUNDERSTORM WARNING FOR LEWIS AND SOUTHEASTERN KNOX
COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER...SMALL HAIL AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 4025 9150 4025 9149 4022 9150 3995 9195
      3995 9198 4007 9212 4026 9186
TIME...MOT...LOC 2348Z 229DEG 42KT 4018 9179

$$

GKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 8:55 PM CDT	River Flood Warning	LSX	Lincoln	60 hr
Apr 3, 2:19 AM CDT	Areal Flood Advisory	LSX	Boone, Moniteau	3 hr
Apr 3, 3:06 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	6 hr
Apr 3, 4:55 AM CDT	Flash Flood Warning	LSX	Gasconade, Osage	6 hr
Apr 3, 5:05 AM CDT	Severe Thunderstorm Warning	LSX	Saint Louis	40 min
Apr 3, 5:19 AM CDT	Severe Thunderstorm Warning	LSX	City of Saint Louis	56 min
Apr 3, 5:23 AM CDT	Tornado Warning Tornado observed	LSX	Saint Louis, City of Saint Louis	37 min
Apr 3, 6:15 AM CDT	River Flood Warning	LSX	Cole	64 hr
Apr 3, 8:11 AM CDT	Areal Flood Advisory	LSX	Jefferson, Sainte Genevieve, Saint Francois, Washington	3 hr
Apr 3, 8:18 AM CDT	River Flood Warning	LSX	Osage	30 hr
Apr 3, 8:58 AM CDT	River Flood Warning	LSX	Monroe	4 days
Apr 3, 9:11 AM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway	49 min
Apr 3, 9:23 AM CDT	Areal Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	3 hr
Apr 3, 12:03 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	42 min
Apr 3, 1:00 PM CDT	Areal Flood Warning	LSX	Boone, Moniteau	24 hr
Apr 3, 1:09 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	36 min
Apr 3, 1:32 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis	43 min
Apr 3, 1:43 PM CDT	Flash Flood Warning	LSX	Crawford, Franklin, Gasconade, Jefferson, Washington	8 hr
Apr 3, 1:54 PM CDT	River Flood Warning	LSX	Marion	42 hr
Apr 3, 1:56 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	49 min
Apr 3, 2:45 PM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	8 hr
Apr 3, 3:36 PM CDT	River Flood Warning	LSX	Jefferson	4 days
Apr 3, 3:36 PM CDT	River Flood Warning	LSX	Franklin	71 hr
Apr 3, 5:37 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	38 min
Apr 3, 5:48 PM CDT	Tornado Warning	LSX	Cole, Osage	27 min
Apr 3, 6:06 PM CDT	Tornado Warning	LSX	Franklin, Gasconade, Osage	24 min
Apr 3, 6:31 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Saint Charles, Warren	44 min
Apr 3, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion, Monroe, Shelby	39 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2014 Every severe thunderstorm warning in 2014

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.