Alert archive / Florida / Flash Flood Warnings in 2018

Flash Flood Warning 4, NWS Tallahassee, FL

May 28, 2018Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at May 28, 2018, 2:04 PM CDT for Walton County, Florida. It was in force for 3 hr. 2 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: May 28, 2018, 2:04 PM CDT (19:04 UTC)
Expired: May 28, 2018, 5:00 PM CDT
In force: 3 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 23 km from the middle of the area, began a volume at 19:04 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 28, 4:00 PM CDT	FLASH FLOOD	1 Wsw Port Washington, FL	FLOODING REPORTED NEAR THE INTERSECTION OF COUNTY HIGHWAY 395 AND EAST POINT WASHINGTON ROAD.
May 28, 4:00 PM CDT	FLASH FLOOD	Blue Mountain Beach, FL	FLOODING REPORTED ALONG FLOUNDER STREET AND DOLPHIN WAY.

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

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.1 hours before the alert went out and 178 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: 843 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

947 
WGUS52 KTAE 281904
FFWTAE
FLC131-282200-
/O.NEW.KTAE.FF.W.0004.180528T1904Z-180528T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
204 PM CDT MON MAY 28 2018

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Walton County in the Panhandle of Florida...

* Until 500 PM CDT.

* At 203 PM CDT, Doppler radar indicated showers associated with 
  Subtropical Storm Alberto producing heavy rain across Central and 
  Southern Walton County. Up to two inches of rain have already 
  fallen and an additional 2 to 3 inches of rain is expected. Flash 
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Santa Rosa Beach, De Funiak Springs, Eglin Air Force Base,
  Freeport, Oakwood Hills, Portland, Alpine Heights, Villa Tasso,
  Blue Mountain Beach, De Funiak Spring Airport, Seaside, Rock Hill,
  Pleasant Ridge, Gulf Pines, Knox Hill, Bunker, Grayton Beach,
  Argyle, Sandestin and Mossy Head.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3079 8639 3074 8604 3070 8603 3070 8585
      3063 8592 3047 8588 3040 8600 3029 8600
      3028 8598 3037 8639 3042 8631 3039 8626
      3040 8623 3041 8627 3039 8611 3047 8613
      3046 8619 3050 8620 3046 8639

$$

38-GODSEY

1 follow-up statement

380 
WGUS72 KTAE 282038
FFSTAE

Flash Flood Statement
National Weather Service Tallahassee FL
338 PM CDT MON MAY 28 2018

FLC131-282200-
/O.CON.KTAE.FF.W.0004.000000T0000Z-180528T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Walton FL-
338 PM CDT MON MAY 28 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
WALTON COUNTY...

At 336 PM CDT, Doppler radar indicated heavy rain across the warned 
area. Three to four inches of rain have already fallen. An 
additional two to three inches is possible. Flash flooding is likely 
to occur soon. 

Some locations that will experience flooding include...
Santa Rosa Beach, De Funiak Springs, Eglin Air Force Base, Freeport,
Oakwood Hills, Portland, Alpine Heights, Villa Tasso, Blue Mountain
Beach, De Funiak Spring Airport, Seaside, Rock Hill, Pleasant Ridge,
Gulf Pines, Knox Hill, Bunker, Grayton Beach, Argyle, Sandestin and
Mossy Head.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3079 8639 3074 8604 3070 8603 3070 8585
      3063 8592 3047 8588 3040 8600 3029 8600
      3028 8598 3037 8639 3042 8631 3039 8626
      3040 8623 3041 8627 3039 8611 3047 8613
      3046 8619 3050 8620 3046 8639

$$

38-GODSEY

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 9:32 PM CDT	River Flood Warning	TAE	Holmes, Washington	35 hr
May 27, 9:32 PM CDT	River Flood Warning	TAE	Walton, Washington	35 hr
May 28, 6:31 AM CDT	Tornado Warning	TAE	Gadsden, Liberty	29 min
May 28, 8:16 AM CDT	Special Marine Warning	TAE		44 min
May 28, 8:55 AM CDT	Special Marine Warning	TAE		35 min
May 28, 10:10 AM CDT	Coastal Flood Advisory	TAE	Bay, Walton	12 hr
May 28, 3:22 PM CDT	River Flood Warning	TAE	Walton	29 hr
May 28, 4:54 PM CDT	Flash Flood Warning	TAE	Walton	4 hr

Nearby

Flash Flood Warnings in Florida, 2018 Every flash flood warning in 2018

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.