Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 246, NWS Tallahassee, FL

September 2, 2018Walton County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Sep 2, 2018, 6:53 PM CDT for Walton County, Florida. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 2, 2018, 6:53 PM CDT (23:53 UTC)
Expired: Sep 2, 2018, 7:09 PM CDT
In force: 16 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 39 km from the middle of the area, began a volume at 23:54 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 12:00Z, 11.9 hours before the alert went out and 193 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: 336 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

911 
WUUS52 KTAE 022353
SVRTAE
FLC131-030030-
/O.NEW.KTAE.SV.W.0246.180902T2353Z-180903T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
653 PM CDT SUN SEP 2 2018

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  West central Walton County in the Panhandle of Florida...

* Until 730 PM CDT.

* At 652 PM CDT, Doppler radar indicated a severe thunderstorm
  capable of producing damaging winds in excess of 60 mph. This storm
  was located near De Funiak Springs, and moving northwest at 25 mph.

* Locations impacted include...
  De Funiak Springs, Eglin Air Force Base, Pond Creek, Oakwood Hills,
  Pleasant Ridge, Alpine Heights, New Home, De Funiak Spring Airport,
  Rock Hill, Mossy Head and Fox Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe thunderstorms produce damaging winds, destructive hail, deadly
lightning and very heavy rain. For your protection, move to an
interior room on the lowest floor of your home or business. Heavy
rains flood roads quickly so do not drive into areas where water
covers the road.

&&

LAT...LON 3085 8639 3088 8637 3066 8605 3055 8610
      3063 8639
TIME...MOT...LOC 2352Z 118DEG 23KT 3065 8616 

$$

30-PULLIN

1 follow-up statement

109 
WWUS52 KTAE 030009
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
709 PM CDT SUN SEP 2 2018

FLC131-030019-
/O.CAN.KTAE.SV.W.0246.000000T0000Z-180903T0030Z/
Walton FL-
709 PM CDT SUN SEP 2 2018

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL WALTON COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 3085 8639 3088 8637 3066 8605 3055 8610
      3063 8639
TIME...MOT...LOC 0006Z 118DEG 23KT 3070 8628 

$$

30-PULLIN

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Sep 2, 2:02 PM CDT, 4 hours 51 minutes earlier.

Area forecast discussion, Sep 2, 2:02 PM CDT, 4 hours 51 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
302 PM EDT Sun Sep 2 2018

.NEAR TERM [Through Tonight]...

There is a broken line of showers and thunderstorms entering the CWA
from the east and these, in addition to the other scattered storms
will continue to push westward through the afternoon and evening. A
strong to severe storm is possible. Convection should diminish in
the 1-2z time frame with re-development over the water for the
second half of the night. With easterly flow persisting through
tonight, low clouds will be possible Monday morning. Lows tonight
will drop into the lower 70s.

.SHORT TERM [Monday Through Tuesday Night]...

Deep layer ridging will remain centered well to our northeast
keeping moist southeast flow in place. This will also help steer
the tropical wave to the west northwest which should be over or
near the Keys by daybreak Monday. NHC has now given the tropical
wave a 90% chance of developing at least into a tropical
depression before approaching the central gulf coast by the end of
this period. There remains some uncertainty concerning potential
local impacts on this developing system. However, latest thinking
is that in addition to heavy rainfall potential, the most
significant impacts will be increasing winds and seas for our
local waters along with an increased rip current threat. All
interests along the northeast gulf coast should monitor this
situation closely. As expected, PoPs the next few days will be
elevated (50-70%). Temps will be near to slightly above seasonal
levels.

.LONG TERM [Wednesday Through Sunday]...

The tropical system is expected to be inland over the Lower
Mississippi River Valley and pull further away from the region
Wednesday into Thursday while weakening. Deep tropical moisture
may linger at least over our western zones Wednesday before
a somewhat drier airmass with more seasonal PoPs return for the
remainder of the week into the next weekend. Temperatures are
forecast near seasonal levels.

&&

.AVIATION [Through 18Z Monday]...

Showers and thunderstorms will continue across the ECP area over
the next few hours but the bulk of convection will move in from
the FL east coast into the VLD area and push westward into TLH,
ABY, and even DHN late this afternoon/evening. While guidance is
hinting at low clouds tomorrow morning, have shown SCT in the
TAFs given observations from this morning.

&&

.MARINE...

Winds will be out of an easterly direction across the coastal waters
today through Thursday. Both winds and seas will peak Monday night
through Tuesday, when at least advisory level conditions are
expected, as a tropical system moves across the waters. Conditions
will gradually improve thereafter into Thursday, as the tropical
system moves out of the waters, and winds and seas subside.

&&

.FIRE WEATHER...

Red flag conditions will not occur over the next several days with
relative humidity remaining above critical levels across the area.

&&

.HYDROLOGY...

Heavy rain is possible each day with afternoon convection, however
the potential for heavy rain will increase for Monday and especially
Tuesday, as a tropical wave moves across the eastern Gulf of Mexico.
Widespread rainfall amounts of 1 to 3 inches are possible, with the
highest amounts closer to the coast. High rainfall rates and the wet
ground may allow for minor flooding, particularly across urbanized
or poor drainage areas. With this tropical wave still a few days
out, it's important to monitor the forecast this weekend.

&&

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not requested. However, spotters are always
encouraged to safely report significant weather conditions when they
occur by calling the office or tweeting us @NWSTallahassee.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   72  90  74  86  74 /  30  70  30  70  30
Panama City   72  88  75  84  76 /  40  70  50  80  50
Dothan        71  89  72  86  72 /  20  50  20  60  30
Albany        73  90  73  87  73 /  10  60  20  50  10
Valdosta      72  89  73  88  74 /  10  60  20  50  10
Cross City    73  89  74  88  74 /  20  70  30  70  20
Apalachicola  75  88  77  84  77 /  40  70  60  70  50

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...High Rip Current Risk until 11 PM EDT /10 PM CDT/ this evening
     for Coastal Bay-Coastal Franklin-South Walton.

GA...None.
AL...None.
GM...None.

&&

NEAR TERM...Fieux
SHORT TERM...Barry
LONG TERM...Barry
AVIATION...Fieux
MARINE...Barry
FIRE WEATHER...DVD
HYDROLOGY...LN

In the hours before

Local storm report, Sep 2, 5:44 PM CDT, 1 hour 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
644 PM EDT SUN SEP 2 2018

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

0640 PM     TSTM WND DMG     2 N SCOTTS FERRY        30.33N 85.13W
09/02/2018                   CALHOUN            FL   FIRE DEPT/RESCUE

            TREE DOWN ON A POWER LINE JUST SOUTH OF
            COUNTY ROAD 275.

&&

DVD

Local storm report, Sep 2, 5:45 PM CDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
645 PM EDT SUN SEP 2 2018

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

0642 PM     TSTM WND DMG     1 WSW SCOTTS FERRY      30.29N 85.14W
09/02/2018                   CALHOUN            FL   FIRE DEPT/RESCUE

            TWO TREES DOWN JUST NORTH OF THE SCOTTS
            FERRY FIRE DEPARTMENT.

&&

DVD

Local storm report, Sep 2, 5:48 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
648 PM EDT SUN SEP 2 2018

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

0620 PM     TSTM WND DMG     5 WNW HOSFORD           30.42N 84.88W
09/02/2018                   LIBERTY            FL   911 CALL CENTER

            VERY LARGE BRANCH DOWN ON HIGHWAY 20.

&&

DVD

Local storm report, Sep 2, 6:02 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
702 PM EDT SUN SEP 2 2018

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

0630 PM     TSTM WND DMG     3 SSW ESTIFFANULGA      30.27N 85.05W
09/02/2018                   LIBERTY            FL   FIRE DEPT/RESCUE

            TELEPHONE POLE LINE DOWN AT 25000 NW COUNTY
            ROAD 333.

&&

DVD

Special weather statement, Sep 2, 6:31 PM CDT, 22 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
631 PM CDT SUN SEP 2 2018

FLZ007-008-108-030015-
Central Walton FL-South Walton FL-North Walton FL-
631 PM CDT SUN SEP 2 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WALTON COUNTY UNTIL 715
PM CDT...

At 631 PM CDT, Doppler radar was tracking a strong thunderstorm 13
miles southeast of De Funiak Springs, moving west at 30 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
De Funiak Springs, Eglin Air Force Base, Freeport, Red Bay, Douglass
Crossroad, Portland, Villa Tasso, De Funiak Spring Airport, Rock
Hill, Bruce, Eucheeanna, Pleasant Ridge, New Home, Knox Hill, Argyle
and Mossy Head.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3075 8638 3072 8604 3070 8603 3070 8588
      3066 8588 3063 8592 3060 8591 3058 8589
      3046 8590 3046 8615 3048 8614 3046 8616
      3046 8619 3048 8620 3049 8619 3050 8620
      3048 8622 3049 8626 3046 8639
TIME...MOT...LOC 2331Z 091DEG 28KT 3057 8601

30-PULLIN

Special weather statement, Sep 2, 6:43 PM CDT, 10 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
743 PM EDT SUN SEP 2 2018

FLZ007>012-108-112-030045-
Coastal Bay FL-Central Walton FL-Holmes FL-Inland Bay FL-
South Walton FL-Jackson FL-North Walton FL-Washington FL-
743 PM EDT SUN SEP 2 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JACKSON...
NORTHWESTERN BAY...WALTON...HOLMES AND WASHINGTON COUNTIES UNTIL 845
PM EDT/745 PM CDT/...

At 742 PM EDT/642 PM CDT/, Doppler radar was tracking strong
thunderstorms along a line extending from near Graceville to near
Panama City. Movement was northwest at 30 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Panama City, Lynn Haven, Panama City Beach, Vernon, Santa Rosa Beach,
De Funiak Springs, Bonifay, Chipley, Graceville, Hiland Park, Eglin
Air Force Base, Tyndall Air Force Base, Bradford, Union, Liberty,
Live Oak, Freeport, Paxton, Ponce De Leon and Caryville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3038 8633 3042 8631 3040 8629 3040 8623
      3043 8626 3043 8625 3038 8616 3039 8611
      3044 8616 3047 8613 3046 8619 3050 8620
      3048 8622 3046 8639 3099 8638 3100 8538
      3010 8566 3038 8640
TIME...MOT...LOC 2342Z 116DEG 27KT 3100 8549 3015 8572

30-PULLIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 7:05 PM CDT	Special Weather Statement	TAE	Jackson	25 min
Sep 1, 7:18 PM CDT	Special Weather Statement	TAE	Washington	27 min
Sep 1, 7:27 PM CDT	Special Weather Statement	TAE	Washington	33 min
Sep 2, 10:03 AM CDT	Rip Current Statement	TAE	Bay, Franklin, Gulf, Walton	4 days
Sep 2, 2:19 PM CDT	Severe Thunderstorm Warning	TAE	Dixie	56 min
Sep 2, 2:26 PM CDT	Special Weather Statement	TAE	Madison	49 min
Sep 2, 2:47 PM CDT	Special Marine Warning	TAE		88 min
Sep 2, 2:57 PM CDT	Special Weather Statement	TAE	Taylor	48 min
Sep 2, 2:59 PM CDT	Special Marine Warning	TAE		91 min
Sep 2, 3:24 PM CDT	Special Weather Statement	TAE	Lafayette	51 min
Sep 2, 3:31 PM CDT	Special Marine Warning	TAE		89 min
Sep 2, 4:06 PM CDT	Tropical Storm Watch	TAE		12 hr
Sep 2, 4:09 PM CDT	Special Weather Statement	TAE	Wakulla	51 min
Sep 2, 4:23 PM CDT	Special Weather Statement	TAE	Franklin	52 min
Sep 2, 4:38 PM CDT	Special Weather Statement	TAE	Liberty	52 min
Sep 2, 4:48 PM CDT	Severe Thunderstorm Warning	TAE	Gadsden, Leon, Liberty, Wakulla	42 min
Sep 2, 5:03 PM CDT	Special Weather Statement	TAE	Gulf	57 min
Sep 2, 5:13 PM CDT	Severe Thunderstorm Warning	TAE	Calhoun, Jackson, Liberty	47 min
Sep 2, 5:49 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gulf, Jackson, Washington	56 min
Sep 2, 6:20 PM CDT	Special Marine Warning	TAE		55 min
Sep 2, 6:31 PM CDT	Special Weather Statement	TAE	Walton	44 min
Sep 2, 6:43 PM CDT	Special Weather Statement	TAE	Holmes, Walton, Washington	62 min

Nearby

Severe Thunderstorm Warnings in Florida, 2018 Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.