Alert archive / Missouri / Tornado Warnings in 2016

Tornado Warning 7, NWS St. Louis, MO

April 27, 2016Knox County, Missouri

NWS St. Louis, MO issued this tornado warning at Apr 27, 2016, 7:39 PM CDT for Knox County, Missouri. It was in force for 21 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 27, 2016, 7:39 PM CDT (00:39 UTC)
Expired: Apr 27, 2016, 8:00 PM CDT
In force: 21 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Knox County, MO

The radar

The Quad Cities radar (KDVN), 203 km from the middle of the area, began a volume at 00:43 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 27, 7:48 PM CDT	TORNADO	1 Wnw Greensburg, MO	BRIEF EF1 TORNADO WITH WINDS OF 90 MPH OCCURRED ON THE KNOX AND SCOTLAND COUNTY LINE. A MANUFACTURED HOME WAS BLOWN OFF ITS BRICKS AND DESTROYED. A DOOR ON A BARN WAS RIPPED OFF ON THE 0.2 MILE PATH. THE TORNADO WAS AROUND 40 YARDS WIDE.
Apr 27, 7:48 PM CDT	TORNADO	4 Nnw Baring, MO	BRIEF EF1 TORNADO WITH WINDS OF 90 MPH OCCURRED ON THE KNOX AND SCOTLAND COUNTY LINE. A MANUFACTURED HOME WAS BLOWN OFF ITS BRICKS AND DESTROYED. A DOOR ON A BARN WAS RIPPED OFF ON THE 0.2 MILE PATH. THE TORNADO WAS AROUND 40 YARDS WIDE.

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
Apr 27, 2:33 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.7 hours before the alert went out and 209 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 338 m²/s²
0-3 km storm-relative helicity: 343 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

591 
WFUS53 KLSX 280039 RRA
TORLSX
MOC103-280100-
/O.NEW.KLSX.TO.W.0007.160428T0039Z-160428T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
739 PM CDT WED APR 27 2016

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN KNOX COUNTY IN NORTHEASTERN MISSOURI...

* UNTIL 800 PM CDT
    
* AT 739 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
  WAS LOCATED NEAR GREENSBURG...MOVING NORTHEAST AT 20 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS...AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS DANGEROUS STORM WILL BE NEAR...
  GREENSBURG AROUND 750 PM CDT. 

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BARING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER
AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4030 9211 4017 9223 4021 9235 4030 9235
      4031 9215
TIME...MOT...LOC 0039Z 205DEG 17KT 4028 9230 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

GOSSELIN

1 follow-up statement

747 
WWUS53 KLSX 280053
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
753 PM CDT WED APR 27 2016

MOC103-280103-
/O.EXP.KLSX.TO.W.0007.000000T0000Z-160428T0100Z/
KNOX MO-
753 PM CDT WED APR 27 2016

...THE TORNADO WARNING FOR NORTHWESTERN KNOX COUNTY WILL EXPIRE AT
800 PM CDT...
    
THE TORNADO THREAT HAS DIMINISHED AND THE TORNADO WARNING HAS BEEN
CANCELLED. HOWEVER...LARGE HAIL AND DAMAGING WINDS REMAIN LIKELY AND A
SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR THE AREA.  

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT FOR NORTHEASTERN
MISSOURI.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
ST LOUIS.

LAT...LON 4030 9211 4017 9223 4021 9235 4030 9235
      4031 9215
TIME...MOT...LOC 0051Z 205DEG 17KT 4028 9230 

$$

GOSSELIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 7:23 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	37 min
Apr 27, 7:39 PM CDT	Tornado Warning	LSX	Lewis, Marion	36 min
Apr 27, 7:46 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Shelby	44 min
Apr 27, 7:59 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	46 min
Apr 27, 8:23 PM CDT	Tornado Warning	LSX	Lewis, Marion, Shelby	37 min
Apr 27, 8:30 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	30 min
Apr 27, 8:48 PM CDT	Severe Thunderstorm Warning	LSX	Lewis, Marion	42 min
Apr 27, 9:15 PM CDT	Tornado Warning Tornado observed	LSX	Lewis	30 min
Apr 27, 9:24 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	38 min
Apr 27, 9:56 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson	34 min
Apr 27, 10:59 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	23 min
Apr 28, 9:53 AM CDT	River Flood Warning	LSX	Callaway, Osage	8 days
Apr 28, 9:53 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	8 days
Apr 28, 9:53 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	6 days

Nearby

Tornado Warnings in Missouri, 2016 Every tornado warning in 2016 Tornadoes 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.