Alert archive / Florida / Tornado Warnings in 2009

Tornado Warning 18, NWS Melbourne, FL

May 25, 2009Saint Lucie County, Florida

NWS Melbourne, FL issued this tornado warning at May 25, 2009, 4:34 PM EDT for Saint Lucie County, Florida. It was in force for 41 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: May 25, 2009, 4:34 PM EDT (20:34 UTC)
Expired: May 25, 2009, 5:15 PM EDT
In force: 41 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 94 km from the middle of the area, began a volume at 20:33 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 nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.6 hours before the alert went out and 135 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: 46 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 10 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.

000 
WFUS52 KMLB 252034
TORMLB
FLC111-252115-
/O.NEW.KMLB.TO.W.0018.090525T2034Z-090525T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
434 PM EDT MON MAY 25 2009

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN ST. LUCIE COUNTY IN FLORIDA...

* UNTIL 515 PM EDT.

* AT 434 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER SOUTHWEST  
  ST. LUCIE COUNTY...OR 13 MILES EAST OF OKEECHOBEE...MOVING SOUTH   
  AT 10 MPH.

* THE TORNADO WILL BE NEAR...
  RURAL SOUTHWESTERN ST. LUCIE COUNTY THROUGH 5 PM EDT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A STRONG BUILDING ON
THE LOWEST FLOOR...IN AN INTERIOR ROOM SUCH AS A BATHROOM OR CLOSET.
KEEP AWAY FROM WINDOWS. GET UNDER A WORKBENCH OR OTHER PIECE OF
STURDY FURNITURE. USE BLANKETS OR PILLOWS TO COVER YOUR BODY.

EVACUATE MOBILE HOMES OR VEHICLES FOR MORE SUBSTANTIAL SHELTER. IF NO
SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS. ABANDON YOUR VEHICLE IF THE
TORNADO IS NEARBY.

&&

LAT...LON 2721 8068 2727 8068 2729 8068 2730 8067
      2735 8067 2735 8061 2721 8055 2721 8063
TIME...MOT...LOC 2034Z 351DEG 9KT 2731 8064

$$

1 follow-up statement

000 
WWUS52 KMLB 252113
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
513 PM EDT MON MAY 25 2009

FLC111-252122-
/O.EXP.KMLB.TO.W.0018.000000T0000Z-090525T2115Z/
ST. LUCIE-
513 PM EDT MON MAY 25 2009

...THE TORNADO WARNING FOR SOUTHWESTERN ST. LUCIE COUNTY WILL EXPIRE
AT 515 PM EDT...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE ROTATION IN THE 
SEVERE STORM THAT PROMPTED THE TORNADO WARNING HAD WEAKENED. 
THUS...THE TORNADO WARNING WILL EXPIRE. HOWEVER...A SEVERE 
THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWEST SAINT LUCIE 
COUNTY. 

LAT...LON 2721 8068 2727 8068 2729 8068 2730 8067
      2735 8067 2735 8061 2721 8055 2721 8063
TIME...MOT...LOC 2112Z 351DEG 9KT 2722 8062

$$


KELLY

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 4:04 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee, Saint Lucie	56 min
May 25, 4:58 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Saint Lucie	62 min
May 25, 5:12 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	21 min
May 25, 6:07 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Seminole	45 min
May 25, 6:25 PM EDT	Areal Flood Advisory	MLB	Orange, Seminole	110 min
May 25, 7:49 PM EDT	Areal Flood Advisory	MLB	Osceola	56 min

Nearby

Tornado Warnings in Florida, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.