Alert archive / Florida / Tornado Warnings in 2015

Tornado Warning 2, NWS Melbourne, FL

April 28, 2015Martin County, Florida

NWS Melbourne, FL issued this tornado warning at Apr 28, 2015, 1:03 PM EDT for Martin County, Florida. It was in force for 42 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: Apr 28, 2015, 1:03 PM EDT (17:03 UTC)
Expired: Apr 28, 2015, 1:45 PM EDT
In force: 42 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Martin County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 5.1 hours before the alert went out and 136 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: 2315 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

100 
WFUS52 KMLB 281703
TORMLB
FLC085-281745-
/O.NEW.KMLB.TO.W.0002.150428T1703Z-150428T1745Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
103 PM EDT TUE APR 28 2015

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN MARTIN COUNTY IN EAST CENTRAL FLORIDA...

* UNTIL 145 PM EDT
    
* AT 103 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED 8
  MILES EAST OF INDIANTOWN...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TEQUESTA...JUPITER ISLAND...HOBE SOUND...PORT SALERNO AND PALM
  CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING ISSUED
FOR THE SAME AREA.

&&

LAT...LON 2712 8040 2713 8015 2712 8015 2711 8014
      2698 8009 2697 8009 2697 8014 2696 8014
      2696 8042
TIME...MOT...LOC 1703Z 278DEG 25KT 2702 8034 

$$

SHARP

2 follow-up statements

265 
WWUS52 KMLB 281727
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
127 PM EDT TUE APR 28 2015

FLC085-281745-
/O.CON.KMLB.TO.W.0002.000000T0000Z-150428T1745Z/
MARTIN FL-
127 PM EDT TUE APR 28 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM EDT FOR
SOUTHEASTERN MARTIN COUNTY...
    
AT 125 PM EDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS STILL 
CAPABLE OF PRODUCING TORNADOES. THESE DANGEROUS STORMS WERE LOCATED 
VERY NEAR JONATHAN DICKINSON STATE PARK...AND NEAR JUPITER 
ISLAND...MOVING EAST AT 30 MPH.

REMAIN COVERED INSIDE SAFE SHELTER!

LOCATIONS IMPACTED INCLUDE...
TEQUESTA...JUPITER ISLAND...HOBE SOUND...PORT SALERNO AND JONATHAN
DICKINSON STATE PARK.

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 IN A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. IF YOU
CANNOT SAFELY DRIVE AWAY FROM THE TORNADO...AS A LAST RESORT...EITHER
PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN
IN A LOW LYING AREA AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 2713 8015 2712 8015 2711 8014 2698 8009
      2697 8009 2697 8014 2696 8014 2696 8021
      2713 8025
TIME...MOT...LOC 1725Z 278DEG 25KT 2700 8016 

$$

DS

905 
WWUS52 KMLB 281742
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
142 PM EDT TUE APR 28 2015

FLC085-281748-
/O.EXP.KMLB.TO.W.0002.000000T0000Z-150428T1745Z/
MARTIN FL-
142 PM EDT TUE APR 28 2015

...THE TORNADO WARNING FOR SOUTHEASTERN MARTIN COUNTY WILL EXPIRE AT
145 PM EDT...
        
THE STORMS WHICH PROMPTED THE TORNADO WARNING AND PREVIOUS SEVERE 
THUNDERSTORM WARNING HAVE MOVED OFFSHORE OF MARTIN AND SAINT LUCIE 
COUNTIES. THEREFORE RELATED WARNINGS WILL BE ALLOWED TO EXPIRE. 

HOWEVER GUSTY WINDS ARE STILL POSSIBLE AND A SPECIAL MARINE WARNING 
REMAINS IN EFFECT FOR THE NEARSHORE COASTAL WATERS OF THESE TWO 
COUNTIES UNTIL 215 PM. 

LAT...LON 2713 8015 2712 8015 2711 8014 2698 8009
      2697 8009 2697 8014 2696 8014 2696 8021
      2713 8025
TIME...MOT...LOC 1735Z 278DEG 25KT 2700 8016 

$$

DS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 11:28 AM EDT	Special Weather Statement	MLB	Okeechobee	62 min
Apr 28, 12:08 PM EDT	Special Weather Statement	MLB	Saint Lucie	52 min
Apr 28, 12:28 PM EDT	Special Weather Statement	MLB	Martin	62 min
Apr 28, 12:43 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Saint Lucie	47 min
Apr 28, 12:49 PM EDT	Special Marine Warning	MLB		86 min

Nearby

Tornado Warnings in Florida, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.