Alert archive / Florida / Flash Flood Warnings in 2017

Flash Flood Warning 5, NWS Miami, FL

August 25, 2017Collier County, Florida

NWS Miami, FL issued this flash flood warning at Aug 25, 2017, 7:48 AM EDT for Collier County, Florida. It was in force for 4 hr. 3 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: Aug 25, 2017, 7:48 AM EDT (11:48 UTC)
Expired: Aug 25, 2017, 11:45 AM EDT
In force: 4 hr
Issued by: NWS Miami, FL
Area: Storm-based polygon
Flood severity: None

County Collier County, FL

The radar

The Miami radar (KAMX), 152 km from the middle of the area, began a volume at 11:51 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.

What was reported inside it

Time	Report	Where	Remark
Aug 25, 8:20 AM EDT	FLOOD	2 N Naples, FL	NAPLES POLICE IS REPORTING FLOODING CONDITIONS ACROSS AREAS OF THE CITY. MULTIPLE ROADWAYS AND INTERSECTIONS ARE CLOSED. STANDING WATER ACROSS SEVERAL AREAS OF DOWNTOWN.
Aug 25, 9:00 AM EDT	FLASH FLOOD	3 Sse Pelican Bay, FL	COLLIER COUNTY EMERGENCY MANAGEMENT REPORTED A GUEST HOUSE ON TRAIL TERRACE DRIVE WAS BEING INUNDATED WITH WATER.
Aug 25, 9:45 AM EDT	FLOOD	1 Nne Naples, FL	COLLIER EMERGENCY MANAGEMENT REPORTS MULTIPLE STRANDED VEHICLES DUE TO FLOOD WATERS ON 10TH STREET SOUTH OF 5TH AVENUE.

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, 11.8 hours before the alert went out and 154 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: 1555 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 654 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

478 
WGUS52 KMFL 251148
FFWMFL
FLC021-251545-
/O.NEW.KMFL.FF.W.0005.170825T1148Z-170825T1545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Miami FL
748 AM EDT FRI AUG 25 2017

The National Weather Service in Miami has issued a

* Flash Flood Warning for...
  Northwestern Collier County in southwestern Florida...

* Until 1145 AM EDT

* At 745 AM EDT, local law enforcement reported thunderstorms
  producing heavy rain across the warned area. Up to three inches of
  rain have already fallen. Flash flooding is expected to begin 
  shortly. Some roadways are now impassable and water is entering 
  vehicles, leaving some vehicle stranded on the roadway. Additional 
  rainfall may cause some water to enter structures in localized 
  areas.

* Some locations that will experience flooding include...
  Naples, Golden Gate Estates, Naples Park, Naples Manor and East
  Naples.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 2633 8184 2633 8182 2632 8182 2632 8166
      2635 8166 2636 8162 2605 8162 2605 8184

$$

SI

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 5:54 AM EDT	Areal Flood Advisory	MFL	Collier	3 hr
Aug 25, 6:42 AM EDT	Special Marine Warning	MFL		48 min
Aug 25, 6:47 AM EDT	Special Weather Statement	MFL	Collier	43 min
Aug 25, 9:22 AM EDT	Special Marine Warning	MFL		83 min
Aug 25, 9:50 AM EDT	Special Weather Statement	MFL	Miami-Dade	40 min
Aug 25, 11:25 AM EDT	Special Marine Warning	MFL		50 min
Aug 25, 11:47 AM EDT	Areal Flood Warning	MFL	Collier	3 hr
Aug 25, 11:58 AM EDT	Coastal Flood Statement	MFL	Collier, Monroe	68 hr
Aug 25, 12:19 PM EDT	Special Weather Statement	MFL	Miami-Dade	41 min
Aug 25, 12:20 PM EDT	Special Marine Warning	MFL		40 min
Aug 25, 12:35 PM EDT	Areal Flood Advisory	MFL	Broward	3 hr

Nearby

Flash Flood Warnings in Florida, 2017 Every flash flood warning in 2017

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.