Alert archive / Florida / Flash Flood Warnings in 2023

Flash Flood Warning 2, NWS Miami, FL

April 11, 2023Miami-Dade County, Florida

NWS Miami, FL issued this flash flood warning at Apr 11, 2023, 2:21 PM EDT for Miami-Dade County, Florida. It was in force for 2 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: Apr 11, 2023, 2:21 PM EDT (18:21 UTC)
Expired: Apr 11, 2023, 2:23 PM EDT
In force: 2 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Flood severity: None

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 13 km from the middle of the area, began a volume at 18:22 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, 6.4 hours before the alert went out and 15 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: 503 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

652 
WGUS52 KMFL 111821
FFWMFL
FLC086-112030-
/O.NEW.KMFL.FF.W.0002.230411T1821Z-230411T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Miami FL
221 PM EDT Tue Apr 11 2023

The National Weather Service in Miami has issued a

* Flash Flood Warning for...
  Central Miami-Dade County in southeastern Florida...

* Until 430 PM EDT.

* At 221 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 3 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 heavy rain.

  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...
  Miami, Coral Gables, South Miami, Kendall, The Redland, Pinecrest, 
  West Miami, Richmond Heights, Sunset, The Crossings, West Kendall, 
  Palmetto Bay, Glenvar Heights, Zoo Miami, West Perrine, Olympia 
  Heights, Kendale Lakes, University Of Miami, University Park and 
  Westchester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 2576 8036 2574 8022 2573 8023 2570 8025
      2568 8026 2567 8027 2557 8032 2557 8046
      2572 8042

FLASH FLOOD...RADAR INDICATED

$$

WR

1 follow-up statement

787 
WGUS72 KMFL 111823
FFSMFL

Flash Flood Statement
National Weather Service Miami FL
223 PM EDT Tue Apr 11 2023

FLC086-111833-
/O.CAN.KMFL.FF.W.0002.000000T0000Z-230411T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Miami-Dade FL-
223 PM EDT Tue Apr 11 2023

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL MIAMI-DADE COUNTY...

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 Wednesday for a 
portion of South Florida.

LAT...LON 2576 8036 2574 8022 2573 8023 2569 8025
      2569 8026 2568 8026 2567 8027 2557 8032
      2557 8046 2572 8042

$$

MFL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 9:39 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	2 hr
Apr 10, 9:56 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	2 hr
Apr 10, 11:07 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	102 min
Apr 10, 11:54 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	2 hr
Apr 11, 3:20 AM EDT	Areal Flood Advisory	MFL	Miami-Dade	115 min
Apr 11, 9:11 AM EDT	Wind Advisory	MFL	Broward, Miami-Dade, Palm Beach	11 hr
Apr 11, 10:22 AM EDT	Special Marine Warning	MFL		38 min
Apr 11, 10:57 AM EDT	Flood Watch	MFL	Broward, Miami-Dade	59 hr
Apr 11, 10:59 AM EDT	Special Marine Warning	MFL		32 min
Apr 11, 12:09 PM EDT	Special Marine Warning	MFL		36 min
Apr 11, 12:17 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	118 min
Apr 11, 1:00 PM EDT	Special Marine Warning	MFL		60 min
Apr 11, 2:21 PM EDT	Special Marine Warning	MFL		54 min
Apr 11, 2:26 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	3 hr
Apr 11, 3:17 PM EDT	Special Marine Warning	MFL		88 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.