Alert archive / Florida / Flash Flood Warnings in 2015

Flash Flood Warning 1, NWS Melbourne, FL

February 28, 2015Martin County, Saint Lucie County, Florida

NWS Melbourne, FL issued this flash flood warning at Feb 28, 2015, 10:15 AM EST for Martin County, Saint Lucie County, Florida. It was in force for 90 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: Feb 28, 2015, 10:15 AM EST (15:15 UTC)
Expired: Feb 28, 2015, 11:45 AM EST
In force: 90 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Flood severity: None

Counties Martin County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 109 km from the middle of the area, began a volume at 15:15 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
Feb 28, 10:30 AM EST	FLOOD	6 Ssw Jensen Beach, FL	MARTIN COUNTY EM REPORTED TWO HOMES IN PALM CITY NEIGHBORHOOD FLOODED. ONE HOME ON 36TH TERRACE WITH TWO INCHES OF WATER IN HOME AND ANOTHER HOME ON 34TH TERRACE WITH WATER IN POOL HOUSE. SURROUNDING ROADS ALSO FLOODED.
Feb 28, 11:00 AM EST	FLOOD	Palm City, FL	MARTIN CO EMERGENCY REPORTED MORE THAN 100 CARS DISABLED DUE TO LATE MORNING FLOODING.
Feb 28, 11:15 AM EST	HEAVY RAIN 7.21	Port Saint Lucie, FL	FLORESTA NEAR PRIMA VISTA IN PORT ST LUCIE.

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, 3.3 hours before the alert went out and 144 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: 27 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 180 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.

226 
WGUS52 KMLB 281515
FFWMLB
FLC085-111-281645-
/O.NEW.KMLB.FF.W.0001.150228T1515Z-150228T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
1015 AM EST SAT FEB 28 2015

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN ST. LUCIE COUNTY IN EAST CENTRAL FLORIDA...
  NORTHEASTERN MARTIN COUNTY IN EAST CENTRAL FLORIDA...

* UNTIL 1145 AM EST
    
* AT 1015 AM EST...DOPPLER RADAR INDICATED PERSISTENT HEAVY RAINFALL 
  CONTINUES. EMERGENCY MANAGEMENT OFFICIALS REPORTED FLOODING IS  
  OCCURRING IN THE PALM CITY AREA NORTH TO PORT ST LUCIE WITH MANY 
  CARS BECOMING STRANDED ON ROADS AND WATER STARTING TO ENTER HOMES.
  
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... PORT SAINT 
  LUCIE...STUART AND PALM CITY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE ON FLOODED ROADS. MOVE TO HIGHER GROUND NOW. MOST FLOOD 
DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS 
WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER 
THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH 
TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE 
THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 2711 8018 2706 8031 2719 8036 2731 8039
      2733 8031 2721 8024 2722 8026 2720 8025
      2720 8023

$$

GLITTO

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 7:34 AM EST	Areal Flood Advisory	MLB	Martin, Saint Lucie	116 min
Feb 28, 8:44 AM EST	Areal Flood Warning	MLB	Martin, Saint Lucie	91 min
Feb 28, 9:57 AM EST	Areal Flood Warning	MLB	Martin, Saint Lucie	78 min
Feb 28, 11:17 AM EST	Areal Flood Warning	MLB	Martin	118 min
Feb 28, 11:47 AM EST	Areal Flood Warning	MLB	Saint Lucie	88 min
Feb 28, 12:17 PM EST	Special Weather Statement	MLB	Martin	43 min
Feb 28, 1:16 PM EST	Areal Flood Warning	MLB	Martin, Saint Lucie	119 min
Feb 28, 6:20 PM EST	Special Weather Statement	MLB	Okeechobee	85 min
Feb 28, 6:34 PM EST	Severe Thunderstorm Warning	MLB	Okeechobee	32 min

Nearby

Flash Flood Warnings in Florida, 2015 Every flash flood 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.