Alert archive / Florida / Flash Flood Warnings in 2020

Flash Flood Warning 1, NWS Melbourne, FL

June 5, 2020Martin County, Florida

NWS Melbourne, FL issued this flash flood warning at Jun 5, 2020, 4:45 PM EDT for Martin County, Florida. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 5, 2020, 4:45 PM EDT (20:45 UTC)
Expired: Jun 5, 2020, 10:00 PM EDT
In force: 5 hr
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Flood severity: None

County Martin County, FL

The radar

The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 20:47 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

Miami, FL (KMFL), launched 12:00Z, 8.8 hours before the alert went out and 146 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: 2261 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 679 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

846 
WGUS52 KMLB 052045
FFWMLB
FLC085-060000-
/O.NEW.KMLB.FF.W.0001.200605T2045Z-200606T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Melbourne FL
445 PM EDT Fri Jun 5 2020

The National Weather Service in Melbourne has issued a

* Flash Flood Warning for...
  Eastern Martin County in east central Florida...

* Until 800 PM EDT.

* At 445 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain moving into eastern Martin county. Flash flooding is 
  ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Stuart, Jupiter Island, Port Salerno, Hobe Sound, Palm City, 
  Jensen Beach, Sewall's Point, Jonathan Dickinson State Park, North 
  River Shores, Ocean Breeze Park, Hobe Sound Wildlife Refuge, Rio.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 2721 8029 2722 8029 2724 8029 2726 8028
      2726 8023 2727 8021 2726 8021 2727 8019
      2710 8011 2697 8006 2697 8014 2696 8014
      2696 8022 2699 8024 2705 8029 2710 8031
      2715 8032

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-4 INCHES IN 2 HOURS 

$$

Kelly

2 follow-up statements

909 
WGUS52 KMLB 052355
FFWMLB
FLC085-060200-
/O.EXT.KMLB.FF.W.0001.000000T0000Z-200606T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Melbourne FL
755 PM EDT Fri Jun 5 2020

The National Weather Service in Melbourne has extended the

* Flash Flood Warning for...
  Eastern Martin County in east central Florida...

* Until 1000 PM EDT.

* At 755 PM EDT, Although heavy rains have ended across eastern 
  Martin county, light to occasionally moderate rain will come to an 
  end later this evening. Many roads are flooded after an additional 
  2 to 4 inches of rain fell between 430pm and 630pm. This is on top 
  of the 7 to 12 inches that fell earlier this week. As darkness 
  falls, motorists are urged to exercise extreme caution.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Stuart, Port Salerno, Hobe Sound, Palm City, Sewall's Point, North 
  River Shores, Ocean Breeze Park, Rio.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 2721 8029 2722 8029 2724 8029 2726 8028
      2726 8023 2727 8021 2726 8021 2727 8019
      2710 8011 2697 8006 2697 8014 2696 8014
      2696 8022 2699 8024 2705 8029 2710 8031
      2715 8032

FLASH FLOOD...RADAR INDICATED

$$

Kelly

476 
WGUS72 KMLB 060157
FFSMLB

Flash Flood Statement
National Weather Service Melbourne FL
957 PM EDT Fri Jun 5 2020

FLC085-060207-
/O.EXP.KMLB.FF.W.0001.000000T0000Z-200606T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Martin FL-
957 PM EDT Fri Jun 5 2020

...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM EDT THIS EVENING FOR 
EASTERN MARTIN COUNTY...

The heavy rain has ended. However, please continue to heed remaining 
road closures. High levels of standing water will remain across much 
of eastern Martin county, especially the Hobe Sound area.

A Flood Watch remains in effect until 800 PM EDT Sunday for a 
portion of east central Florida.

LAT...LON 2721 8029 2722 8029 2724 8029 2726 8028
      2726 8023 2727 8021 2726 8021 2727 8019
      2710 8011 2697 8006 2697 8014 2696 8014
      2696 8022 2699 8024 2705 8029 2710 8031
      2715 8032

$$

Kelly

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 2:05 PM EDT	Special Weather Statement	MLB	Indian River	25 min
Jun 5, 2:32 PM EDT	Special Weather Statement	MLB	Brevard	43 min
Jun 5, 3:24 PM EDT	Areal Flood Advisory	MLB	Martin	81 min
Jun 5, 3:32 PM EDT	Special Weather Statement	MLB	Okeechobee	28 min
Jun 5, 4:59 PM EDT	Special Weather Statement	MLB	Seminole	31 min
Jun 5, 5:14 PM EDT	Special Weather Statement	MLB	Indian River	31 min
Jun 5, 5:34 PM EDT	Special Weather Statement	MLB	Volusia	41 min
Jun 5, 5:42 PM EDT	Areal Flood Advisory	MLB	Brevard	63 min
Jun 5, 6:30 PM EDT	Special Weather Statement	MLB	Martin	30 min
Jun 5, 7:04 PM EDT	Special Weather Statement	MLB	Seminole	26 min

Nearby

Flash Flood Warnings in Florida, 2020 Every flash flood warning in 2020

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.