Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 8, NWS Miami, FL

July 20, 2021Broward County, Florida

NWS Miami, FL issued this flash flood warning at Jul 20, 2021, 4:04 PM EDT for Broward County, Florida. It was in force for 99 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: Jul 20, 2021, 4:04 PM EDT (20:04 UTC)
Expired: Jul 20, 2021, 5:43 PM EDT
In force: 99 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Flood severity: None

County Broward County, FL

The radar

The Miami radar (KAMX), 72 km from the middle of the area, began a volume at 20:03 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, 8.1 hours before the alert went out and 47 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: 2142 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 757 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

940 
WGUS52 KMFL 202004
FFWMFL
FLC011-202300-
/O.NEW.KMFL.FF.W.0008.210720T2004Z-210720T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Miami FL
404 PM EDT Tue Jul 20 2021

The National Weather Service in Miami has issued a

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

* Until 700 PM EDT.

* At 404 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 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...
  Coral Springs, Davie, Plantation, Sunrise, Tamarac, Margate, 
  Lauderhill, Coconut Creek, North Lauderdale, Lauderdale Lakes, 
  Cooper City, Parkland, Broadview-Pompano Park, Sawgrass Mills 
  Mall, Pine Island Ridge, Godfrey Road, Sunshine Acres, Ramblewood 
  East, Markham Park and Hillsboro Pines.

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 2633 8020 2625 8020 2619 8020 2609 8023
      2605 8030 2614 8034 2620 8031 2633 8029
      2633 8025 2633 8023 2633 8022

FLASH FLOOD...RADAR INDICATED

$$

CWC

2 follow-up statements

503 
WGUS72 KMFL 202107
FFSMFL

Flash Flood Statement
National Weather Service Miami FL
507 PM EDT Tue Jul 20 2021

FLC011-202300-
/O.CON.KMFL.FF.W.0008.000000T0000Z-210720T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Broward FL-
507 PM EDT Tue Jul 20 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING 
FOR NORTHERN BROWARD COUNTY...

At 507 PM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen.

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...
  Coral Springs, Davie, Plantation, Sunrise, Tamarac, Margate, 
  Lauderhill, Coconut Creek, North Lauderdale, Lauderdale Lakes, 
  Cooper City, Parkland, Broadview-Pompano Park, Sawgrass Mills 
  Mall, Pine Island Ridge, Godfrey Road, Sunshine Acres, Ramblewood 
  East, Markham Park and Hillsboro Pines.

The heaviest rainfall has moved out of the area, This will continue 
to be monitored, however, if the heaviest rainfall continues to move 
away from the warning area, the warning may be cancelled.

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 2633 8020 2625 8020 2619 8020 2609 8023
      2605 8030 2614 8034 2620 8031 2633 8029
      2633 8025 2633 8023 2633 8022

FLASH FLOOD...RADAR INDICATED

$$

CWC

384 
WGUS72 KMFL 202143
FFSMFL

Flash Flood Statement
National Weather Service Miami FL
543 PM EDT Tue Jul 20 2021

FLC011-202153-
/O.CAN.KMFL.FF.W.0008.000000T0000Z-210720T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Broward FL-
543 PM EDT Tue Jul 20 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN BROWARD COUNTY...

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

LAT...LON 2633 8020 2625 8020 2619 8020 2609 8023
      2605 8030 2614 8034 2620 8031 2633 8029
      2633 8025 2633 8023 2633 8022

$$

CWC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 12:45 PM EDT	Areal Flood Advisory	MFL	Broward, Palm Beach	3 hr
Jul 20, 1:51 PM EDT	Special Weather Statement	MFL	Palm Beach	39 min
Jul 20, 2:20 PM EDT	Special Weather Statement	MFL	Miami-Dade	40 min
Jul 20, 3:03 PM EDT	Special Weather Statement	MFL	Hendry	42 min
Jul 20, 4:37 PM EDT	Areal Flood Advisory	MFL	Broward, Palm Beach	66 min
Jul 20, 4:45 PM EDT	Special Weather Statement	MFL	Broward	45 min

Nearby

Flash Flood Warnings in Florida, 2021 Every flash flood warning in 2021

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.