Alert archive / Florida / Flash Flood Warnings in 2020

Flash Flood Warning 2, NWS Miami, FL

May 15, 2020Broward County, Florida

NWS Miami, FL issued this flash flood warning at May 15, 2020, 8:21 PM EDT for Broward County, Florida. It was in force for 53 min. 1 report 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: May 15, 2020, 8:21 PM EDT (00:21 UTC)
Expired: May 15, 2020, 9:14 PM EDT
In force: 53 min
Issued by: NWS Miami, FL
Area: Storm-based polygon
Flood severity: None

County Broward County, FL

The radar

The Miami radar (KAMX), 68 km from the middle of the area, began a volume at 00:24 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
May 15, 8:50 PM EDT	FLASH FLOOD	Lauderhill, FL	AN OFF-DUTY NWS METEOROLOGIST REPORTED SIGNIFICANT STEET FLOODING SEVERAL INCHES DEEP AT THE INTERSECTION OF NW 47TH AVE AND NW 21ST ST AND VICINITY IN LAUDERHILL, FL. FLOOD WATERS ACCUMULATED WITH HEAVY RAINS EXTENDING THROUGH THE 8PM HOUR. THEREAFTER, FLOODI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 0.4 hours before the alert went out and 43 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: 355 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

702 
WGUS52 KMFL 160021
FFWMFL
FLC011-160415-
/O.NEW.KMFL.FF.W.0002.200516T0021Z-200516T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Miami FL
821 PM EDT Fri May 15 2020

The National Weather Service in Miami has issued a

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

* Until 1215 AM EDT.

* At 818 PM EDT, Doppler radar and automated gauges indicated 
  showers producing heavy rain across the warned area. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by heavy showers.

  SOURCE...Radar and rain gauges.

  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 flooding include...
  Fort Lauderdale, Pompano Beach, Davie, Plantation and Sunrise. 

Additional rainfall amounts of one to three inches are possible in 
the warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

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.

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.

&&

LAT...LON 2626 8011 2625 8019 2621 8028 2618 8033
      2615 8035 2609 8032 2615 8010 2622 8009

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

Cohen/Weinman/Caracozza

1 follow-up statement

266 
WGUS72 KMFL 160114
FFSMFL

Flash Flood Statement
National Weather Service Miami FL
914 PM EDT Fri May 15 2020

FLC011-160122-
/O.CAN.KMFL.FF.W.0002.000000T0000Z-200516T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Broward FL-
914 PM EDT Fri May 15 2020

...THE FLASH FLOOD WARNING FOR CENTRAL BROWARD COUNTY IS CANCELLED...

The heavy rain has ended. However, light rain continues, and waters 
may be slow to recede in areas where flooding previously occurred. A 
Flood Advisory remains in effect.

LAT...LON 2626 8011 2625 8019 2621 8028 2618 8033
      2615 8035 2609 8032 2615 8010 2622 8009

$$

Cohen

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 8:09 PM EDT	Areal Flood Advisory	MFL	Miami-Dade	4 hr
May 15, 8:34 PM EDT	Flash Flood Warning	MFL	Miami-Dade	3 hr
May 15, 9:29 PM EDT	Special Marine Warning	MFL		111 min
May 15, 10:24 PM EDT	Special Marine Warning	MFL		111 min
May 15, 11:59 PM EDT	Special Marine Warning	MFL		2 hr
May 16, 1:09 AM EDT	Areal Flood Advisory	MFL	Broward	3 hr
May 16, 1:52 AM EDT	Flash Flood Warning	MFL	Broward	3 hr
May 16, 3:18 AM EDT	Small Craft Advisory	MFL		7 hr
May 16, 4:14 PM EDT	Special Weather Statement	MFL	Palm Beach	46 min
May 16, 5:51 PM EDT	Special Weather Statement	MFL	Hendry	39 min
May 16, 6:31 PM EDT	Special Weather Statement	MFL	Broward	44 min
May 16, 6:58 PM EDT	Special Marine Warning	MFL		2 hr
May 16, 7:05 PM EDT	Special Weather Statement	MFL	Broward	55 min
May 16, 7:17 PM EDT	Areal Flood Advisory	MFL	Broward	3 hr
May 16, 7:25 PM EDT	Severe Thunderstorm Warning	MFL	Broward	51 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.