Alert archive / Florida / Flash Flood Warnings in 2023

Flash Flood Warning 21, NWS Miami, FL

October 1, 2023Broward County, Florida

NWS Miami, FL issued this flash flood warning at Oct 1, 2023, 4:50 PM EDT for Broward County, Florida. It was in force for 85 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: Oct 1, 2023, 4:50 PM EDT (20:50 UTC)
Expired: Oct 1, 2023, 6:15 PM EDT
In force: 85 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Flood severity: None

County Broward County, FL

The radar

The Miami radar (KAMX), 54 km from the middle of the area, began a volume at 20:51 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 27 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: 1137 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 878 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

677 
WGUS52 KMFL 012050
FFWMFL
FLC011-012215-
/O.NEW.KMFL.FF.W.0021.231001T2050Z-231001T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Miami FL
450 PM EDT Sun Oct 1 2023

The National Weather Service in Miami has issued a

* Flash Flood Warning for...
  Southern Broward County in southeastern Florida...

* Until 615 PM EDT.

* At 450 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2.5 and 3.5 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.

  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...
  Fort Lauderdale, Pembroke Pines, Hollywood, Davie, Plantation, 
  Dania Beach, Cooper City, Oak Point, Chambers Estates, Estates Of 
  Fort Lauderdale, Ravenswood Estates, Broadview Park, Fort 
  Lauderdale - Hollywood International Airport, Chula Vista, Nova 
  Southeastern University, Royal Palm Ranches, Pine Island Ridge, 
  Intersection I-595 And I-95, Riverland Village and Downtown Davie.

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.

&&

LAT...LON 2602 8027 2610 8028 2610 8017 2608 8011
      2600 8011

FLASH FLOOD...RADAR INDICATED

$$

NC

1 follow-up statement

614 
WGUS72 KMFL 012205
FFSMFL

Flash Flood Statement
National Weather Service Miami FL
605 PM EDT Sun Oct 1 2023

FLC011-012215-
/O.EXP.KMFL.FF.W.0021.000000T0000Z-231001T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Broward FL-
605 PM EDT Sun Oct 1 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 615 PM EDT THIS EVENING FOR 
SOUTHERN BROWARD COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

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

LAT...LON 2602 8027 2610 8028 2610 8017 2608 8011
      2600 8011

$$

NC

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 1, 5:56 AM EDT	Flood Watch	MFL	Broward, Miami-Dade, Palm Beach	14 hr
Oct 1, 7:13 AM EDT	River Flood Warning	MFL	Glades	5 days
Oct 1, 8:23 AM EDT	Areal Flood Advisory	MFL	Broward	65 min
Oct 1, 8:46 AM EDT	Areal Flood Advisory	MFL	Broward	89 min
Oct 1, 9:38 AM EDT	Rip Current Statement	MFL	Broward, Miami-Dade	4 days
Oct 1, 9:41 AM EDT	Small Craft Advisory	MFL		3 days
Oct 1, 10:55 AM EDT	Areal Flood Advisory	MFL	Palm Beach	87 min
Oct 1, 3:45 PM EDT	Areal Flood Advisory	MFL	Broward, Palm Beach	73 min
Oct 1, 4:23 PM EDT	Areal Flood Advisory	MFL	Broward	27 min
Oct 1, 4:27 PM EDT	Special Weather Statement	MFL	Broward	33 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.