Alert archive / Florida / Flash Flood Warnings in 2023

Flash Flood Warning 2, NWS Melbourne, FL

September 30, 2023Volusia County, Florida

NWS Melbourne, FL issued this flash flood warning at Sep 30, 2023, 7:42 AM EDT for Volusia County, Florida. It was in force for 2 hr. 2 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: Sep 30, 2023, 7:42 AM EDT (11:42 UTC)
Expired: Sep 30, 2023, 9:45 AM EDT
In force: 2 hr
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Flood severity: None

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 140 km from the middle of the area, began a volume at 11:41 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
Sep 30, 9:30 AM EDT	FLOOD	2 Ne Ormond Beach Airpo, FL	Volusia County Fire Rescue reports multiple road closures near the Tomoka Estates region. US-1 at Wall Avenue is partially closed due to flooding. High Bridge Road across the Halifax near State Road A1A is also closed due to flooding.
Sep 30, 9:30 AM EDT	FLOOD	3 S Ormond Beach Airpor, FL	Volusia County Fire Rescue reports flooding of several areas in Ormond Beach due to excessive rainfall. Multiple homes are reported as having water damage along Cherokee Road, Seminole Drive, Sylvan Drive, and Tulip Tree Lane.

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 00:00Z, 11.7 hours before the alert went out and 112 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: 1244 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 726 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

215 
WGUS52 KMLB 301142
FFWMLB
FLC127-301345-
/O.NEW.KMLB.FF.W.0002.230930T1142Z-230930T1345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Melbourne FL
742 AM EDT Sat Sep 30 2023

The National Weather Service in Melbourne has issued a

* Flash Flood Warning for...
  North Central Volusia County in east central Florida...

* Until 945 AM EDT.

* At 742 AM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  4 and 6 inches of rain have fallen. Additional rainfall amounts of 
  1 to 2 inches are possible in the warned area. Flash flooding is 
  ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Daytona Beach, Ormond Beach, Holly Hill, Ormond-By-the-Sea and 
  Ormond Beach Airport.

This includes the following streams and drainages...
  Bulow Creek and Priest Branch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 2940 8107 2927 8101 2915 8127 2926 8127
      2926 8125 2926 8120 2927 8119 2927 8118
      2927 8117 2927 8115 2935 8115 2938 8115

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Weitlich

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 1:44 AM EDT	Rip Current Statement	MLB	Brevard, Indian River, Martin, Saint Lucie, Volusia	5 days
Sep 30, 4:25 AM EDT	Areal Flood Advisory	MLB	Volusia	3 hr
Sep 30, 5:10 AM EDT	Areal Flood Advisory	MLB	Volusia	2 hr
Sep 30, 5:34 AM EDT	Areal Flood Warning	MLB	Volusia	3 hr
Sep 30, 6:27 AM EDT	Areal Flood Warning	MLB	Volusia	3 hr
Sep 30, 6:43 AM EDT	Areal Flood Advisory	MLB	Volusia	40 min
Sep 30, 7:23 AM EDT	Areal Flood Warning	MLB	Volusia	2 hr
Sep 30, 7:30 AM EDT	Areal Flood Warning	MLB	Volusia	90 min
Sep 30, 7:46 AM EDT	Areal Flood Advisory	MLB	Volusia	119 min
Sep 30, 9:10 AM EDT	Areal Flood Advisory	MLB	Lake	95 min
Sep 30, 9:37 AM EDT	Areal Flood Advisory	MLB	Lake, Volusia	113 min
Sep 30, 9:43 AM EDT	Areal Flood Warning	MLB	Volusia	2 hr
Sep 30, 11:24 AM EDT	Areal Flood Advisory	MLB	Volusia	81 min
Sep 30, 11:50 AM EDT	Areal Flood Advisory	MLB	Volusia	3 hr
Sep 30, 12:40 PM EDT	Areal Flood Advisory	MLB	Martin, Saint Lucie	95 min
Sep 30, 2:13 PM EDT	Areal Flood Advisory	MLB	Indian River, Martin, Okeechobee, Saint Lucie	2 hr
Sep 30, 3:06 PM EDT	Flood Watch	MLB	Brevard, Indian River, Martin, Saint Lucie, Volusia	29 hr
Sep 30, 3:14 PM EDT	Coastal Flood Advisory	MLB	Brevard, Indian River, Martin, Saint Lucie, Volusia	36 hr
Sep 30, 3:51 PM EDT	Small Craft Advisory	MLB		5 days
Sep 30, 4:43 PM EDT	Areal Flood Warning	MLB	Indian River, Saint Lucie	3 hr

Nearby

Flash Flood Warnings in Florida, 2023 Every flash flood warning in 2023

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.