Alert archive / Missouri / Tornado Warnings in 2013

Tornado Warning 19, NWS St. Louis, MO

May 20, 2013Monroe County, Missouri

NWS St. Louis, MO issued this tornado warning at May 20, 2013, 6:50 PM CDT for Monroe County, Missouri. It was in force for 25 min. 3 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: May 20, 2013, 6:50 PM CDT (23:50 UTC)
Expired: May 20, 2013, 7:15 PM CDT
In force: 25 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Monroe County, MO

The radar

The St Louis radar (KLSX), 135 km from the middle of the area, began a volume at 23:53 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
May 20, 6:53 PM CDT	TSTM WND DMG	Florida, MO	2 LARGE TREES BLOWN DOWN IN FLORIDA
May 20, 6:57 PM CDT	TSTM WND GST 50	Stoutsville, MO	WIND WAS BENDING TREES TO NEAR 45 DEGREE ANGLE...BUT NO DAMAGE SEEN YET.
May 20, 6:57 PM CDT	HAIL 0.7	Stoutsville, MO	WIND WAS BENDING TREES TO NEAR 45 DEGREE ANGLE...BUT NO DAMAGE SEEN YET.

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
May 20, 5:24 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 268 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: 4 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 1298 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 256 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.

847 
WFUS53 KLSX 202350
TORLSX
MOC137-210015-
/O.NEW.KLSX.TO.W.0019.130520T2350Z-130521T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
650 PM CDT MON MAY 20 2013

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN MONROE COUNTY IN NORTHEAST MISSOURI...

* UNTIL 715 PM CDT

* AT 644 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 6 MILES WEST OF SANTA FE...AND MOVING NORTHEAST
  AT 30 MPH.

  HAZARD...DEVELOPING TORNADO AND HALF DOLLAR SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE HEAVILY DAMAGED OR DESTROYED.
           SIGNIFICANT DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL
           OCCUR. FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS.
           EXTENSIVE TREE DAMAGE IS LIKELY.

* THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF EASTERN
  MONROE COUNTY...INCLUDING THE FOLLOWING LOCATIONS FLORIDA AND
  INDIAN CREEK.

THIS WARNING INCLUDES MARK TWAIN LAKE RECREATIONAL AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3939 9209 3966 9186 3966 9172 3934 9172
      3934 9195
TIME...MOT...LOC 2349Z 224DEG 27KT 3940 9191

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

BRITT

1 follow-up statement

318 
WWUS53 KLSX 210010
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
710 PM CDT MON MAY 20 2013

MOC137-210020-
/O.EXP.KLSX.TO.W.0019.000000T0000Z-130521T0015Z/
MONROE MO-
710 PM CDT MON MAY 20 2013

...THE TORNADO WARNING FOR EASTERN MONROE COUNTY WILL EXPIRE AT 715
PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 100 AM CDT.

LAT...LON 3939 9209 3966 9186 3966 9172 3934 9172
      3934 9195
TIME...MOT...LOC 0010Z 224DEG 27KT 3951 9177

$$

BRITT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 3:05 AM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, Warren, City of Saint Louis	40 min
May 20, 5:37 PM CDT	Severe Thunderstorm Warning	LSX	Osage	38 min
May 20, 5:55 PM CDT	Severe Thunderstorm Warning	LSX	Knox	35 min
May 20, 5:58 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe	32 min
May 20, 5:59 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	46 min
May 20, 6:22 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	38 min
May 20, 6:24 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	51 min
May 20, 6:44 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	31 min
May 20, 6:57 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	48 min

Nearby

Tornado Warnings in Missouri, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.