Alert archive / Florida / Flash Flood Warnings in 2015

Flash Flood Warning 20, NWS Tallahassee, FL

September 28, 2015Walton County, Florida

NWS Tallahassee, FL issued this flash flood warning at Sep 28, 2015, 9:08 PM CDT for Walton County, Florida. It was in force for 2 hr. 7 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: Sep 28, 2015, 9:08 PM CDT (02:08 UTC)
Expired: Sep 28, 2015, 11:30 PM CDT
In force: 2 hr
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Flood severity: None

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 16 km from the middle of the area, began a volume at 02:12 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
Sep 28, 9:12 PM CDT	FLASH FLOOD	4 Wsw De Funiak Springs, FL	ALL BRIDGES ON BOB SIKES ROAD CLOSED FROM HIGHWAY 285 TO THE 4005 ADDRESS.
Sep 28, 10:20 PM CDT	FLASH FLOOD	2 W Eucheeanna, FL	INDIAN CREEK RANCH ROAD WAS CLOSED DUE TO FLOODING
Sep 28, 10:20 PM CDT	FLASH FLOOD	2 W Pleasant Ridge, FL	WATER RISING UP TO NEAR THE BRIDGE ON CORBIN GANEY ROAD
Sep 28, 10:20 PM CDT	FLASH FLOOD	3 S Pleasant Ridge, FL	COSSON ROAD WAS CLOSED AT THE BRIDGE DUE TO FLOODING.
Sep 28, 10:45 PM CDT	FLASH FLOOD	2 E Douglass Crossroad, FL	WATER COVERING PORTIONS OF STATE HIGHWAY 81 JUST SOUTH OF THE HOLMES COUNTY LINE
Sep 28, 11:00 PM CDT	HEAVY RAIN 9.7	De Funiak Spring Airpor, FL	DAILY TOTAL OF 9.70 INCHES AT THE DE FUNIAK SPRING AIRPORT
Sep 28, 11:30 PM CDT	HEAVY RAIN 11.5	De Funiak Springs, FL	24 HOUR RAINFALL TOTAL OF 11.50 INCHES FROM DE FUNIAK SPRINGS

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 5 storm reports to this flash flood warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.1 hours before the alert went out and 166 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: 538 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 810 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

702 
WGUS52 KTAE 290208
FFWTAE
FLC131-290430-
/O.NEW.KTAE.FF.W.0020.150929T0208Z-150929T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
908 PM CDT MON SEP 28 2015

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN WALTON COUNTY IN THE PANHANDLE OF FLORIDA...

* UNTIL 1130 PM CDT
    
* AT 906 PM CDT...DOPPLER RADAR INDICATED VERY HEAVY RAINFALL MOVING 
  NORTHWARD INTO PORTIONS OF NORTHERN WALTON COUNTY. FLASH FLOODING 
  IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  DE FUNIAK SPRINGS...EGLIN AIR FORCE BASE...UNION...LIBERTY...
  PAXTON...PLEASANT HILL...PINEY GROVE...KNOX HILL...LAKEWOOD...
  DOUGLASS CROSSROAD...GASKIN...OAKWOOD HILLS...PLEASANT RIDGE...
  CENTER RIDGE...FOX HILL...GLENDALE...CLUSTER SPRINGS...ARGYLE...
  GORDON AND FLOWERSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 3099 8635 3099 8604 3071 8604 3070 8603
      3070 8585 3068 8587 3066 8587 3066 8589
      3063 8592 3060 8591 3058 8589 3056 8589
      3056 8588 3053 8588 3060 8600 3061 8637

$$

42-DVD

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this flash flood warning went out at Sep 28, 7:27 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, Sep 28, 7:27 PM CDT, 1 hour 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
827 PM EDT MON SEP 28 2015

.Near Term [Through Tonight]...
Meso-low has developed along the coast of Walton County this
evening, which has dramatically enhanced the low-level convergence
in the area with very heavy rainfall ongoing. A few areas in
Walton County have received 4 to 6 inches of rain since late this
afternoon, with another 1 to 2 inches possible. The axis of
heaviest rain has begun to slide eastward over the last hour or
so, with increasing rain rates expected to reach Panama City by
mid-evening. Have increased PoPs and heavy rain wording for these
areas. Otherwise, the forecast for the remainder of the area is
largely unchanged, with showers and isolated thunderstorms
expected through the overnight hours.

&&

.Aviation...
[Through 00Z Wednesday] Showers and possibly a few thunderstorms
will impact all area terminals through the overnight hours.
Heaviest rain to impact KECP. Cigs will likely reach IFR levels
across the region by morning, before slowly lifting through the
day on Tuesday. Rain will decrease from southwest to northeast
during the day.

&&

.Prev Discussion [414 PM EDT]...

.Short Term [Tuesday Through Wednesday Night]...
A lot of uncertainty in the precip evolution through Tuesday as
the weak low over the east central Gulf lifts north towards the
Florida Big Bend. CAM guidance has had trouble picking up the
areas of heaviest precip (with today's round setting up over the
western Panhandle). Deep tropical moisture and difluent flow aloft
continue to argue for elevated PoPs through Tuesday, which is
supported by most of the guidance. While widespread heavy rain is
not anticipated, given the tropical nature of the convection, any
convective bands which setup and remain stationary could drop
several inches of rain in a very short amount of time. During the
day on Tuesday, expect best focus for rain to gradually lift
north, with best rain chances across the northwestern half of the
forecast area.

Rain chances will be on the decline for Wednesday. However, still
expect scattered showers and storms to develop with the upper
trough axis still west of the forecast area.

.Long Term [Thursday Through Monday]...
Expect to see decreasein PoPs during the latter half of the week
as the upper trough axis slides just east of the forecast area and
north to northwest upper level flow develops. Expect to see the
drier conditions continue throught he weekend with a cooler
airmass working in as well. Expect to see temperatures near or
just below normal for most of the area this weekend.

.Marine...
Winds over the coastal waters will increase overnight as weak low
pressure lifts north from the east central Gulf. Expect to see a
period of Small Craft Advisory conditions over the offshore
waters, with Exercise Caution over the nearshore legs. Winds and
seas will begin to diminish on Tuesday and remain below headline
levels through the end of the work week.

.Fire Weather...
Hazardous fire weather conditions are not expected over the next
several days. Rain chances will start to decrease by mid-week.

.Hydrology...
Over the past 24 hours, the rainfall amounts have generally been
confined to around 1.5 inches or less with some higher amounts
across the far western counties. With additional rainfall through
tomorrow night, total rainfall amounts through 8 AM Wednesday are
expected around 1 to 3 inches across SE Alabama and SW Georgia
with 2 to 5 inches expected across the Florida portion of the
CWA. However, isolated amounts up to 8 inches are possible.

With plenty of tropical mositure in place and the potential for
training of heavy rain leading to isolated higher rainfall totals,
flash flooding will be possible mainly in low lying and urban
areas. Given this, will continue with the Flash Flood Watch that
is in effect through tonight.

With the heaviest amounts predicted nearer to the coast, area
rivers will be able to handle this event without reaching flood
stage given the recent dry conditions. With current streamflows,
we'd need several inches of rain to get into the upper portions of
many of the larger rivers and streams to produce river flooding,
which still do not anticipate during this particular event.

&&

.Preliminary Point Temps/PoPs...

Tallahassee   73  87  74  87  71 /  80  60  20  40  20
Panama City   74  84  74  84  71 / 100  50  20  40  20
Dothan        70  84  70  84  67 / 100  60  30  50  20
Albany        71  84  72  85  68 /  80  70  30  50  30
Valdosta      71  86  73  86  70 /  80  70  30  50  20
Cross City    73  86  74  86  72 /  70  60  20  40  20
Apalachicola  74  85  75  84  72 /  90  50  20  40  20

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...FLASH FLOOD WATCH until 8 AM EDT /7 AM CDT/ Tuesday FOR Calhoun-
     Central Walton-Coastal Bay-Coastal Dixie-Coastal Franklin-
     Coastal Gulf-Coastal Jefferson-Coastal Taylor-Coastal
     Wakulla-Gadsden-Holmes-Inland Bay-Inland Dixie-Inland
     Franklin-Inland Gulf-Inland Jefferson-Inland Taylor-Inland
     Wakulla-Jackson-Lafayette-Leon-Liberty-Madison-North Walton-
     South Walton-Washington.

     HIGH RIP CURRENT RISK until 8 AM EDT /7 AM CDT/ Tuesday FOR
     Coastal Bay-Coastal Franklin-Coastal Gulf-South Walton.

GA...FLASH FLOOD WATCH until 8 AM EDT Tuesday FOR Brooks-Decatur-
     Grady-Lowndes-Seminole-Thomas.

AL...FLASH FLOOD WATCH until 7 AM CDT Tuesday FOR Geneva-Houston.

GM...SMALL CRAFT ADVISORY until 8 AM EDT Tuesday FOR Waters from
     Suwannee River to Apalachicola FL from 20 to 60 NM-Waters
     from Apalachicola to Destin FL from 20 to 60 NM.

&&

NEAR TERM...CAMP
SHORT TERM...CAMP
LONG TERM...CAMP
AVIATION...CAMP
MARINE...CAMP
FIRE WEATHER...HARRIGAN
HYDROLOGY...FIEUX

In the hours before

Local storm report, Sep 28, 6:12 PM CDT, 2 hours 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
712 PM EDT MON SEP 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0554 PM     FLOOD            3 SSW SANTA ROSA BEACH  30.35N 86.25W
09/28/2015                   WALTON             FL   TRAINED SPOTTER

            REPORT FROM SPOTTER OF 6-12 INCHES OF WATER OVERPORTIONS
            OF COUNTY ROAD 30A.

&&

CAMP

Local storm report, Sep 28, 7:21 PM CDT, 1 hour 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
821 PM EDT MON SEP 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 PM     FLASH FLOOD      3 SSW SANTA ROSA BEACH  30.35N 86.25W
09/28/2015                   WALTON             FL   911 CALL CENTER

            COUNTY ROAD 30A CLOSED DUE TO 1 TO 2 FEET OF WATER.

&&

CAMP

Local storm report, Sep 28, 8:29 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
929 PM EDT MON SEP 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0925 PM     FLASH FLOOD      ROCK HILL               30.60N 86.11W
09/28/2015                   WALTON             FL   BROADCAST MEDIA

            HIGHWAY 331 CLOSED FROM I-10 SOUTH TO ROCK HILL DUE TO
            FLASH FLOODING.

&&

DVD

Local storm report, Sep 28, 8:30 PM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
930 PM EDT MON SEP 28 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0925 PM     FLASH FLOOD      1 ESE SEAGROVE BEACH    30.32N 86.12W
09/28/2015                   WALTON             FL   BROADCAST MEDIA

            WATER KNEE DEEP ON MONTGOMERY STREET

&&

DVD

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 28, 7:55 PM CDT	Special Marine Warning	TAE		65 min
Sep 28, 8:14 PM CDT	Flash Flood Warning	TAE	Bay, Walton, Washington	3 hr
Sep 28, 8:54 PM CDT	Special Marine Warning	TAE		2 hr
Sep 28, 10:14 PM CDT	Flash Flood Warning	TAE	Holmes	3 hr
Sep 28, 11:42 PM CDT	Flash Flood Warning	TAE	Holmes, Washington	93 min
Sep 29, 12:45 AM CDT	Flash Flood Warning	TAE	Jackson	90 min
Sep 29, 2:12 AM CDT	Flash Flood Warning	TAE	Jackson	93 min
Sep 29, 5:28 AM CDT	River Flood Warning	TAE	Walton	30 hr
Sep 29, 9:09 AM CDT	Areal Flood Warning	TAE	Walton	12 hr
Sep 29, 10:54 AM CDT	Areal Flood Warning	TAE	Walton	12 hr

Nearby

Flash Flood Warnings in Florida, 2015 Every flash flood warning in 2015

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.