Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 13, NWS Melbourne, FL

April 27, 2015Martin County, Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 27, 2015, 6:28 PM EDT for Martin County, Saint Lucie County, Florida. It was in force for 47 min. 14 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, 2015, 6:28 PM EDT (22:28 UTC)
Expired: Apr 27, 2015, 7:15 PM EDT
In force: 47 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Martin County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 107 km from the middle of the area, began a volume at 22:29 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, 6:29 PM EDT	HAIL 1	2 Wsw Palm City, FL	A STORM SPOTTER REPORTED QUARTER-SIZED HAIL FALLING NEAR THE INTERSECTION OF SW HIGH MEADOWS AVENUE AND SW MARTIN AVENUE JUST EAST OF THE FLORIDA TURNPIKE.
Apr 27, 6:29 PM EDT	HAIL 1.25	5 Wsw Jensen Beach, FL	A TRAINED SPOTTER REPORTED HALF-DOLLAR SIZED HAIL AT THEIR RESIDENCE JUST SOUTH OF BECKER ROAD ALONG THE C-23 CANAL.
Apr 27, 6:30 PM EDT	HAIL 1	6 Ssw Jensen Beach, FL	TRAINED SPOTTER REPORTED QUARTER-SIZED HAIL ABOUT 1 MILE NE OF EXIT 133...SW MARTIN HWY...ON THE FLORIDA TURNPIKE.
Apr 27, 6:33 PM EDT	HAIL 1.25	3 S Jensen Beach, FL	TRAINED SPOTTER JUST NORTH OF WITHAM FIELD AIRPORT IN STUART REPORTS HALF DOLLAR SIZED HAIL.
Apr 27, 6:35 PM EDT	HAIL 1	3 S Jensen Beach, FL	TRAINED SPOTTER REPORTED NICKEL TO QUARTER-SIZED HAIL NEAR WITHAM FIELD AIRPORT.
Apr 27, 6:35 PM EDT	HAIL 1.25	5 Sse Palm City, FL	HALF-DOLLAR SIZED HAIL REPORTED BY SPOTTER ABOUT 1 MILE EAST OF INTERSECTION OF I-95 AND SW KANNER HWY...EXIT 101.
Apr 27, 6:35 PM EDT	HAIL 1.75	4 Se Palm City, FL	TRAINED SPOTTER REPORTS GOLF BALL SIZED HAIL IN STUART NEAR THE INTERSECTION OF SE COVE ROAD AND SE FEDERAL HIGHWAY US-1.
Apr 27, 6:35 PM EDT	HAIL 1.75	5 Nw Hobe Sound, FL	TRAINED SPOTTER REPORTS GOLF BALL SIZED HAIL IN THE PINELAKE GARDENS AND ESTATES SUBDIVISION IN STUART.
Apr 27, 6:36 PM EDT	HAIL 1	4 Ese Palm City, FL	SPOTTER REPORT OF NICKEL TO QUARTER SIZED HAIL NEAR THE INTERSECTION OF SE DIXIE HIGHWAY AND SE ST. LUCIE BLVD.
Apr 27, 6:38 PM EDT	TSTM WND GST 51	5 Ese Palm City, FL	AN APRS MESONET SITE NEAR SE DIXIE HIGHWAY AND MANATEE POCKET RECORDED A 44 KNOT / 51 MPH WIND GUST OUT OF THE NORTH.
Apr 27, 6:39 PM EDT	TSTM WND DMG	5 S Jensen Beach, FL	REPORT OF A TREE UPROOTED AND FELL ONTO A VEHICLE NEAR THE INTERSECTION OF US-1 SE FEDERAL HIGHWAY AND SE INDIAN ST. IN STUART. PERSON WAS TEMPORARILY TRAPPED BUT WAS ABLE TO GET OUT.
Apr 27, 6:40 PM EDT	HAIL 1	3 Nnw Hobe Sound, FL	QUARTER-SIZED HAIL REPORTED NEAR THE INTERSECTION OF SE OSPREY ST. AND SE FEDERAL HWY US-1 IN HOBE SOUND.
Apr 27, 6:40 PM EDT	HAIL 1.25	3 Sse Palm City, FL	SPOTTER REPORTS HALF-DOLLAR SIZED HAIL NEAR THE INTERSECTION OF SW SALERNO ROAD AND KANNER HWY IN PALM CITY.
Apr 27, 6:40 PM EDT	HAIL 1.75	5 Se Palm City, FL	COCORAHS REPORT OF GOLF BALL SIZED HAIL NEAR THE INTERSECTION OF SE COVE ROAD AND US-1 SE FEDERAL HIGHWAY IN STUART. ALSO REPORTED...ESTIMATED WIND SPEEDS OF 60 MPH.

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

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.5 hours before the alert went out and 142 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: 1826 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: -0.5
Supercell composite: -3.2

Open this sounding in Storm Lab

The text

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

233 
WUUS52 KMLB 272228
SVRMLB
FLC085-111-272315-
/O.NEW.KMLB.SV.W.0013.150427T2228Z-150427T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
628 PM EDT MON APR 27 2015

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN ST. LUCIE COUNTY IN EAST CENTRAL FLORIDA...
  MARTIN COUNTY IN EAST CENTRAL FLORIDA...

* UNTIL 715 PM EDT

* AT 625 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN 
  EXCESS OF 60 MPH. THIS STORM WAS LOCATED 5 MILES NORTHWEST OF 
  INDIANTOWN...AND MOVING EAST AT 50 MPH. ANOTHER SEVERE STORM WAS 5 
  MILES WEST OF STUART AND ALSO MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PORT SAINT LUCIE...JENSEN BEACH...PORT SALERNO...PALM CITY...
  STUART... INDIANTOWN AND JUPITER ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

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

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF THESE
STORMS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE WEATHER...
INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE WINDS... 
AND POSSIBLY TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS AN 
INTERIOR ROOM.

&&

LAT...LON 2698 8055 2720 8059 2737 8029 2735 8026
      2739 8026 2734 8024 2733 8027 2722 8021
      2721 8026 2725 8032 2724 8032 2717 8026
      2720 8026 2719 8020 2721 8020 2716 8017
      2718 8016 2698 8008
TIME...MOT...LOC 2225Z 264DEG 45KT 2710 8047 

$$

15

2 follow-up statements

570 
WWUS52 KMLB 272255
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
655 PM EDT MON APR 27 2015

FLC111-272302-
/O.CAN.KMLB.SV.W.0013.000000T0000Z-150427T2315Z/
ST. LUCIE FL-
655 PM EDT MON APR 27 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. LUCIE COUNTY
IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 2699 8033 2704 8030 2713 8028 2719 8025
      2718 8019 2721 8020 2717 8018 2717 8020
      2716 8017 2718 8016 2712 8014 2712 8015
      2702 8010 2699 8008
TIME...MOT...LOC 2252Z 264DEG 45KT 2714 8008 

$$

FLC085-272315-
/O.CON.KMLB.SV.W.0013.000000T0000Z-150427T2315Z/
MARTIN FL-
655 PM EDT MON APR 27 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR EASTERN MARTIN COUNTY...

AT 652 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 
MPH. THIS STORM WAS LOCATED 10 MILES WEST OF JONATHAN DICKINSON 
STATE PARK MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE... JONATHAN DICKINSON STATE PARK...PORT 
SALERNO...HOBE SOUND AND PALM CITY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 2699 8033 2704 8030 2713 8028 2719 8025
      2718 8019 2721 8020 2717 8018 2717 8020
      2716 8017 2718 8016 2712 8014 2712 8015
      2702 8010 2699 8008
TIME...MOT...LOC 2252Z 264DEG 45KT 2714 8008 

$$

15

650 
WWUS52 KMLB 272309
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
709 PM EDT MON APR 27 2015

FLC085-272318-
/O.EXP.KMLB.SV.W.0013.000000T0000Z-150427T2315Z/
MARTIN FL-
709 PM EDT MON APR 27 2015

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MARTIN COUNTY WILL
EXPIRE AT 715 PM EDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA 
ACROSS THE ATLANTIC WATERS. THEREFORE THE WARNING WILL BE ALLOWED TO 
EXPIRE.

LAT...LON 2699 8033 2704 8030 2713 8028 2719 8025
      2718 8019 2721 8020 2717 8018 2717 8020
      2716 8017 2718 8016 2712 8014 2712 8015
      2702 8010 2699 8008
TIME...MOT...LOC 2307Z 264DEG 45KT 2714 8008 

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 5:27 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Okeechobee, Saint Lucie	63 min
Apr 27, 5:53 PM EDT	Special Marine Warning	MLB		82 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.