Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 225, NWS Tallahassee, FL

July 13, 2017Gadsden County, Leon County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jul 13, 2017, 6:34 PM EDT for Gadsden County, Leon County, Florida. It was in force for 26 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: Jul 13, 2017, 6:34 PM EDT (22:34 UTC)
Expired: Jul 13, 2017, 7:00 PM EDT
In force: 26 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Gadsden County, FL, Leon County, FL

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, 10.6 hours before the alert went out and 24 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: 1523 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 841 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS52 KTAE 132234
SVRTAE
FLC039-073-132300-
/O.NEW.KTAE.SV.W.0225.170713T2234Z-170713T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
634 PM EDT THU JUL 13 2017

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  South central Gadsden County in Big Bend of Florida...
  Southwestern Leon County in Big Bend of Florida...

* Until 700 PM EDT

* At 632 PM EDT, severe thunderstorms were located along a line
  extending from near Midway to 13 miles northwest of Crawfordville,
  moving southwest at 20 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Midway, Lake Talquin, Bloxham and Fort Braden. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Tallahassee.

&&

LAT...LON 3033 8466 3052 8460 3052 8444 3030 8447
      3030 8448
TIME...MOT...LOC 2232Z 023DEG 17KT 3045 8452 3031 8453 

HAIL...<.75IN
WIND...60MPH
 
$$

18-WOOL

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 Jul 13, 4:07 PM EDT, 2 hours 27 minutes earlier.

Area forecast discussion, Jul 13, 4:07 PM EDT, 2 hours 27 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
407 PM EDT Thu Jul 13 2017

.NEAR TERM [Through Tonight]...

The East coast sea breeze is more potent and has made it further
west earlier than normal this afternoon. Expect these storms to
continue to push west for the next few hours with coverage
decreasing after sunset. Overnight storms will favor the western
waters with PoPs 40-60% offshore. Lows tonight will be in the mid
70s.

.SHORT TERM [Friday Through Saturday Night]...

The western extent of the Bermuda Ridge will build across our
forecast area Friday, extending from the surface to the upper
levels. Mid-layer drying/subsidence associated with this feature
will limit the coverage of deep moist convection across our region,
with the greatest chance of rain across the FL Panhandle (30-40%
PoP) where there will still be adequate moisture. Elsewhere PoPs
will be 20% or less. An upper trough will begin to develop across
much of the eastern CONUS Saturday and Saturday night, and a
weakening surface cold front will stall across north-central GA
and AL. While we don't expect any synoptic scale forcing from the
trough, the prevailing wind field we be altered in such a way as
to increase deep-layer moisture somewhat across our region, and
shift the sea breeze circulation so that the rain chances will be
near average (30-40%) and fairly evenly distributed across the
area. It will be warm this weekend, with high temperatures in the
mid 90s and lows in the mid 70s.

.LONG TERM [Sunday Through Thursday]...

A mean deep-layer trough will be the main synoptic feature across
much of the Southeast, with moist southwest winds expected across
our forecast area. This is typically a favorable environment for the
development of scattered to numerous daytime thunderstorms as the
sea breeze fronts form and move inland. PoPs will be in the 30-50%
range (highest south) each afternoon, with slight rain chances
overnight. Temperatures will be near average with lows in the 70s
and highs in the lower to mid 90s.

&&

.AVIATION [Through 18Z Friday]...

VFR conditions are expected through much of the TAF cycle.
Thunderstorms this afternoon are likely to affect ECP through 21z,
with storms moving in from the east affecting VLD/TLH between
20-24z. Thereafter, storms are likely to diminish with clear skies
overnight. Brief MVFR/IFR vsby restrictions are possible at VLD
before sunrise on Friday. All sites VFR after 13z.

&&

.MARINE...

With a high pressure ridge near and north of the marine area, the
prevailing winds through Saturday will be east to southeast less
than 15 knots, with seas 3 feet or less. As the ridge becomes
centered over the coastal waters Sunday and Monday, winds will
become south to southwest 5 to 10 knots, with sea 2 feet or less.

&&

.FIRE WEATHER...

There are no fire weather concerns for the next several days.

&&

.HYDROLOGY...

A typical summertime pattern is expected, with locally heavy rains
possible, but organized heavy rain that would lead to river flooding
or flash flooding is unlikely.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   74  94  74  94  74 /  20  20  10  40  10
Panama City   77  90  77  90  77 /  30  40  10  30  10
Dothan        75  94  74  94  74 /  20  40  10  30  20
Albany        75  95  75  94  74 /  10  20  10  30  20
Valdosta      74  95  74  95  74 /  10  20  10  30  20
Cross City    74  94  74  94  74 /  10  20  10  20  10
Apalachicola  77  90  77  90  77 /  30  40  20  40  10

&&

.TAE WATCHES/WARNINGS/ADVISORIES...

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

&&

NEAR TERM...Weston
SHORT TERM...Fournier
LONG TERM...Fournier
AVIATION...Weston
MARINE...Fournier
FIRE WEATHER...Weston
HYDROLOGY...Fournier

In the hours before

Local storm report, Jul 13, 4:47 PM EDT, 1 hour 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
447 PM EDT THU JUL 13 2017

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

0447 PM     TSTM WND DMG     WSW BRIGGSTON           30.72N 83.31W
07/13/2017                   LOWNDES            GA   911 CALL CENTER

            REPORT OF A TREE DOWN ON MADISON HWY

&&

RH

Special weather statement, Jul 13, 4:50 PM EDT, 1 hour 44 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
450 PM EDT THU JUL 13 2017

GAZ147-148-161-132130-
Berrien GA-Lanier GA-Cook GA-
450 PM EDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR COOK...BERRIEN AND NORTHWESTERN
LANIER COUNTIES IN SOUTH CENTRAL GEORGIA UNTIL 530 PM EDT...

At 449 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorms along a line extending from near Willacoochee to
near Hahira. Movement was northwest at 25 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Nashville, Adel, Lakeland, Sparks, Enigma, Ray City, Lenox, Alapaha,
Meigs, Cecil, Reed Bingham State Park, New Lois, Gladys, Massee,
Greggs, Glory, Flat Ford, Wagon Wheel, Allenville and Weber.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms 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 3098 8313 3099 8318 3103 8318 3103 8343
      3105 8350 3105 8354 3108 8358 3118 8354
      3120 8351 3132 8351 3134 8344 3140 8337
      3146 8337 3148 8334 3147 8315 3140 8314
      3133 8306 3128 8304 3119 8305 3118 8298
TIME...MOT...LOC 2049Z 113DEG 21KT 3131 8298 3100 8330

38-GODSEY

Local storm report, Jul 13, 5:10 PM EDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
510 PM EDT THU JUL 13 2017

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

0509 PM     TSTM WND DMG     QUITMAN                 30.79N 83.56W
07/13/2017                   BROOKS             GA   911 CALL CENTER

            REPORT OF TREES DOWN IN BROOKS COUNTY

&&

RH

Special weather statement, Jul 13, 5:28 PM EDT, 1 hour 6 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
528 PM EDT THU JUL 13 2017

FLZ017-132230-
Leon FL-
528 PM EDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR LEON COUNTY IN THE FLORIDA
BIG BEND UNTIL 630 PM EDT...

At 527 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorms along a line extending from near Monticello to
10 miles east of Woodville. Movement was northwest at 20 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Tallahassee, Woodville, Florida State University, Florida A And M,
Tallahassee Comm College, Doak Campbell Stadium, Lake Bradford, Leon
Sinks, Gaither Community Center, Tallahassee Memorial Hosp,
Miccosukee, Iamonia, Eight Mile Pond, Tallahassee Mall, Tallahassee
Regional A/P, Governors Square Mall, Natural Bridge, Belair, Levy
Park and Indian Head Acres.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms 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 3052 8404 3046 8404 3044 8407 3027 8408
      3027 8424 3030 8425 3030 8442 3031 8446
      3060 8434 3060 8433 3064 8430 3067 8431
      3068 8430 3067 8401 3061 8401 3055 8398
      3052 8398
TIME...MOT...LOC 2127Z 129DEG 16KT 3059 8395 3024 8404

38-GODSEY

Local storm report, Jul 13, 5:32 PM EDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
532 PM EDT THU JUL 13 2017

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

0455 PM     TSTM WND DMG     NW BLUE SPRINGS         30.14N 83.77W
07/13/2017                   TAYLOR             FL   911 CALL CENTER

            REPORT OF A TREE DOWN ON A POWERLINE IN TAYLOR COUNTY

&&

RH

Local storm report, Jul 13, 5:59 PM EDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
559 PM EDT THU JUL 13 2017

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

0544 PM     TSTM WND DMG     5 WNW BOSTON            30.82N 83.86W
07/13/2017                   THOMAS             GA   911 CALL CENTER

            REPORTS OF POWERLINES AND TREES DOWN BETWEEN THOMASVILLE
            AND BOSTON...ONE REPORT OF A TREE DOWN ON A RESIDENCE

&&

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 2:29 PM EDT	Special Marine Warning	TAE		91 min
Jul 13, 3:33 PM EDT	Special Weather Statement	TAE	Madison	57 min
Jul 13, 3:53 PM EDT	Severe Thunderstorm Warning	TAE	Madison	67 min
Jul 13, 4:20 PM EDT	Special Weather Statement	TAE	Taylor	40 min
Jul 13, 4:32 PM EDT	Severe Thunderstorm Warning	TAE	Jefferson, Madison	43 min
Jul 13, 4:47 PM EDT	Severe Thunderstorm Warning	TAE	Madison, Taylor	43 min
Jul 13, 5:05 PM EDT	Severe Thunderstorm Warning	TAE	Jefferson	55 min
Jul 13, 5:28 PM EDT	Special Weather Statement	TAE	Leon	62 min

Nearby

Severe Thunderstorm Warnings in Florida, 2017 Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive.