Alert archive / Florida / Flash Flood Warnings in 2017

Flash Flood Warning 7, NWS Tallahassee, FL

April 4, 2017Lafayette County, Madison County, Taylor County, Florida

NWS Tallahassee, FL issued this flash flood warning at Apr 4, 2017, 3:25 AM EDT for Lafayette County, Madison County, Taylor County, Florida. It was in force for 4 hr. 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: Apr 4, 2017, 3:25 AM EDT (07:25 UTC)
Expired: Apr 4, 2017, 7:30 AM EDT
In force: 4 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

Counties Lafayette County, FL, Madison County, FL, Taylor County, FL

The radar

The Tallahassee radar (KTLH), 79 km from the middle of the area, began a volume at 07:24 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
Apr 4, 7:00 AM EDT	FLASH FLOOD	Mayo Junction, FL	SEVERAL HOUSES FLOODED IN MAYO. SINKHOLE ON HWY 51 N ABOUT 50FT BY 75FT. SEVERAL ROADS WASHED OUT. RADAR ESTIMATIONS OF UP TO 12 INCHES RAIN 12 HRS ENDING 0900 EDT/13Z.

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

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 7.4 hours before the alert went out and 175 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: 1154 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

526 
WGUS52 KTAE 040725
FFWTAE
FLC067-079-123-041130-
/O.NEW.KTAE.FF.W.0007.170404T0725Z-170404T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tallahassee FL
325 AM EDT TUE APR 4 2017

The National Weather Service in Tallahassee has issued a

* Flash Flood Warning for...
  Northwestern Lafayette County in Big Bend of Florida...
  Northern Taylor County in Big Bend of Florida...
  Southern Madison County in Big Bend of Florida...

* Until 730 AM EDT

* At 323 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar estimates that between 6 
  and 9 inches of rain have fallen over the last several hours and 
  additional heavy rain is expected. Flash flooding is expected to 
  begin shortly.

* Some locations that will experience flooding include...
  Lee, Iddo, Moseley Hall, Ebb, Chancey, Secotan, Boyd, Hopewell,
  Eridu, Cabbage Grove, Mayo Junction, Lake Bird, Day, Sirmans and
  Shady Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3037 8319 3035 8319 3035 8321 3031 8321
      3025 8325 3018 8325 3016 8396 3019 8395
      3020 8393 3025 8392 3028 8384 3032 8379
      3038 8381 3039 8379 3038 8378 3040 8376
      3044 8322 3042 8322 3041 8319 3039 8317

$$

42-DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 8:15 PM EDT	Special Marine Warning	TAE		2 hr
Apr 3, 8:19 PM EDT	Special Weather Statement	TAE	Madison	26 min
Apr 3, 8:22 PM EDT	Special Weather Statement	TAE	Wakulla	38 min
Apr 3, 9:00 PM EDT	Special Weather Statement	TAE	Taylor	60 min
Apr 3, 9:46 PM EDT	Special Weather Statement	TAE	Lafayette	59 min
Apr 3, 10:13 PM EDT	Special Marine Warning	TAE		62 min
Apr 3, 10:42 PM EDT	Special Weather Statement	TAE	Lafayette	63 min
Apr 4, 12:36 AM EDT	Special Weather Statement	TAE	Lafayette	39 min
Apr 4, 12:55 AM EDT	Severe Thunderstorm Warning	TAE	Lafayette	22 min
Apr 4, 4:13 AM EDT	Dense Fog Advisory	TAE	Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more	6 hr
Apr 4, 4:43 AM EDT	Flash Flood Warning	TAE	Lafayette, Taylor	4 hr
Apr 4, 5:13 AM EDT	Special Marine Warning	TAE		92 min
Apr 4, 6:36 AM EDT	Special Marine Warning	TAE		114 min
Apr 4, 8:48 AM EDT	Flash Flood Warning	TAE	Lafayette, Taylor	117 min
Apr 4, 10:42 AM EDT	Rip Current Statement	TAE	Bay, Gulf, Walton	8 hr
Apr 4, 4:18 PM EDT	Special Marine Warning	TAE		117 min
Apr 4, 6:31 PM EDT	Special Marine Warning	TAE		119 min
Apr 4, 6:47 PM EDT	Special Weather Statement	TAE	Gulf	43 min
Apr 4, 7:13 PM EDT	Severe Thunderstorm Warning	TAE	Gulf	32 min
Apr 4, 7:27 PM EDT	Special Marine Warning	TAE		33 min
Apr 4, 7:30 PM EDT	Special Marine Warning	TAE		30 min
Apr 4, 7:38 PM EDT	Severe Thunderstorm Warning	TAE	Calhoun, Franklin, Gulf, Liberty	37 min
Apr 4, 7:55 PM EDT	Special Marine Warning	TAE		65 min
Apr 4, 7:58 PM EDT	Special Marine Warning	TAE		32 min

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.