Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 96, NWS Tallahassee, FL

June 28, 2018Leon County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jun 28, 2018, 6:38 PM EDT for Leon County, Florida. It was in force for 19 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: Jun 28, 2018, 6:38 PM EDT (22:38 UTC)
Expired: Jun 28, 2018, 6:57 PM EDT
In force: 19 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Leon County, FL

The radar

The Tallahassee radar (KTLH), 12 km from the middle of the area, began a volume at 22:42 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, 10.6 hours before the alert went out and 15 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: 1691 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

121 
WUUS52 KTAE 282238
SVRTAE
FLC073-282315-
/O.NEW.KTAE.SV.W.0096.180628T2238Z-180628T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
638 PM EDT THU JUN 28 2018

The National Weather Service in Tallahassee has issued a

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

* Until 715 PM EDT.

* At 638 PM EDT, a severe thunderstorm was located 9 miles south of
  Midway, moving east at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Tallahassee, Tallahassee Comm College, Lake Bradford, Brown House,
  Leon Sinks, Andrew, Tallahassee Regional A/P, Helen, Fort Braden
  and Eight Mile Pond.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3043 8457 3047 8443 3047 8441 3049 8434
      3030 8430 3030 8456
TIME...MOT...LOC 2238Z 263DEG 12KT 3036 8449 

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

15-HARRIGAN

1 follow-up statement

783 
WWUS52 KTAE 282257
SVSTAE

Severe Weather Statement
National Weather Service Tallahassee FL
657 PM EDT THU JUN 28 2018

FLC073-282307-
/O.CAN.KTAE.SV.W.0096.000000T0000Z-180628T2315Z/
Leon FL-
657 PM EDT THU JUN 28 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LEON 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.

LAT...LON 3043 8457 3047 8443 3047 8441 3049 8434
      3030 8430 3030 8456
TIME...MOT...LOC 2255Z 263DEG 12KT 3037 8442 

$$

15-HARRIGAN

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 Jun 28, 3:46 PM EDT, 2 hours 52 minutes earlier.

Area forecast discussion, Jun 28, 3:46 PM EDT, 2 hours 52 minutes before

Area Forecast Discussion
National Weather Service Tallahassee FL
346 PM EDT Thu Jun 28 2018

.NEAR TERM [Through Tonight]...

Large MCS has formed to the north stretching from east-central
Georgia into Middle Tennessee. The entire complex is dropping
southward and should reach the northern CWA border by mid to late
afternoon. Dewpoints in the lower to mid 70s and temperatures in the
lower to mid 90s are supporting MLCAPE values above 2500j/kg. Meso-
analysis indicates downdraft CAPE values over 1000 j/kg ahead of the
line as well. This supports a risk of damaging winds across the
forecast area through the evening. SPC has the region in a Slight
Risk area.

The MCS should push offshore by mid to late evening, with rain
chances diminishing after midnight.

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

The ribbon of upper level +PV helping fuel today's MCS will sink
into southern AL and GA by Friday morning and settle into place
over the tri-state area this weekend. This will enhance divergence
aloft and help keep chances for showers and thunderstorms
elevated through Saturday night. Instability will be slightly
lower Friday and Saturday, however, around 1500-2000 j/kg or so,
which will mean more typical chances for strong wind gusts like we
tend to see during the summer. Afternoon highs will be slightly
lower Friday and Saturday, staying in the low- mid 90s, and
morning lows will be in the low- mid 70s.

.LONG TERM [Sunday Through Thursday]...

The +PV anomaly aloft will begin to dissipate and shift westward by
mid-week as another anomaly moves westward towards the Atlantic
coastline of GA and SC. Chances for showers and thunderstorms remain
high through Monday, then settle back into our climatological
chances of around 40-50% each afternoon. Temperatures will peak in
the low 90s and lows will dip into the low-mid 70s.

&&

.AVIATION [Through 18Z Friday]...

Scattered convection may impact the terminals early in the
afternoon. However, a line of strong thunderstorms is expected to
cross the region from north to south during the late afternoon
and evening. Expect to see strong winds at all terminals
associated with these thunderstorms. Once the line passes,
conditions should improve the remainder of the overnight hours.

&&

.MARINE...

Winds will be around 15 knots or less and seas 2 feet or less
through the period outside of thunderstorms.

&&

.FIRE WEATHER...

Fire weather concerns will be low the next few days with above
normal chances for rain anticipated through the weekend.

&&

.HYDROLOGY...

Several rounds of soaking rainfall are expected to add up to around
1.5-2.5 inches of accumulations across the area through this
weekend. Our area rivers are at normal levels right now, so these
totals are unlikely to cause flooding issues. That said, areas that
receive heavier rainfall over shorter time periods may see localized
flooding.

&&

.SPOTTER INFORMATION STATEMENT...

Spotter activation is requested. Spotters should safely report
significant weather conditions and/or damage by calling the office or
tweeting us @NWSTallahassee.

&&

.PRELIMINARY POINT TEMPS/POPS...

Tallahassee   75  92  74  90  74 /  70  50  40  50  50
Panama City   79  91  76  90  75 /  60  60  40  50  50
Dothan        74  92  75  91  73 /  70  60  30  60  50
Albany        74  94  76  91  74 /  60  50  40  50  40
Valdosta      74  92  74  90  73 /  60  50  40  60  40
Cross City    76  91  74  89  74 /  40  50  40  60  40
Apalachicola  78  91  77  89  77 /  60  50  50  60  50

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AL...None.
GM...None.
&&

NEAR TERM...Camp
SHORT TERM...Nguyen
LONG TERM...Nguyen
AVIATION...Camp
MARINE...Nguyen
FIRE WEATHER...Dobbs
HYDROLOGY...Nguyen

In the hours before

Special weather statement, Jun 28, 5:32 PM EDT, 1 hour 6 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
532 PM EDT THU JUN 28 2018

FLZ029-034-282215-
Inland Dixie FL-Lafayette FL-
532 PM EDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LAFAYETTE AND
NORTHEASTERN DIXIE COUNTIES UNTIL 615 PM EDT...

At 532 PM EDT, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Cross City, moving southeast at 10 mph.

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

Locations impacted include...
Cross City, Shamrock, Cross City Airport, Old Town, Hatch Bend,
Eugene, Fletcher, Grady and Fanning Springs.

LAT...LON 2981 8293 2976 8295 2970 8294 2970 8296
      2961 8297 2958 8295 2959 8294 2954 8298
      2947 8299 2948 8305 2957 8318 2977 8315
      2986 8307 3009 8310 2999 8296 2996 8295
      2995 8292 2989 8292 2988 8288
TIME...MOT...LOC 2132Z 328DEG 10KT 2975 8305

15-HARRIGAN

Special weather statement, Jun 28, 5:35 PM EDT, 1 hour 3 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
535 PM EDT THU JUN 28 2018

GAZ146>148-282215-
Berrien GA-Colquitt GA-Cook GA-
535 PM EDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR COOK...SOUTH CENTRAL BERRIEN AND
SOUTHEASTERN COLQUITT COUNTIES UNTIL 615 PM EDT...

At 534 PM EDT, Doppler radar was tracking a strong thunderstorm near
Norman Park, or 10 miles east of Moultrie, moving southeast at 10
mph.

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

Locations impacted include...
Moultrie, Adel, Nashville, Sparks, Riverside, Berlin, Cecil,
Ellenton, Reed Bingham State Park, New Lois, Massee, Greggs, Flat
Ford, Wagon Wheel, South Moultrie, Moultrie Municipal A/P, Murphy,
Cottle, Cook Co A/P and Cool Spring.

LAT...LON 3103 8325 3103 8347 3104 8349 3105 8350
      3105 8355 3108 8357 3103 8357 3104 8378
      3103 8378 3103 8379 3104 8380 3104 8383
      3125 8382 3124 8326
TIME...MOT...LOC 2134Z 328DEG 10KT 3123 8361

15-HARRIGAN

Special weather statement, Jun 28, 5:37 PM EDT, 1 hour 1 minute before

Special Weather Statement
National Weather Service Tallahassee FL
437 PM CDT THU JUN 28 2018

ALZ066-067-282215-
Dale AL-Henry AL-
437 PM CDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN DALE AND HENRY
COUNTIES UNTIL 515 PM CDT...

At 437 PM CDT, Doppler radar was tracking a strong thunderstorm near
Abbeville, moving southeast at 10 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Abbeville, Headland, Newville, Bells Crossroads, Tumbleton, Kirkland
Crossroads, Hayes, Snells Crossroads, Graball, Headland Municipal
A/P, Dancey, Balkum, Echo, Hardwickburg, Blackwood, Capps, Barefield
Crossroads, Murphy Station, Clopton and Ward Bridge.

LAT...LON 3150 8506 3133 8537 3155 8555 3162 8543
      3162 8542 3163 8542 3170 8528 3170 8526
TIME...MOT...LOC 2137Z 314DEG 10KT 3156 8534

15-HARRIGAN

Special weather statement, Jun 28, 5:52 PM EDT, 46 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
552 PM EDT THU JUN 28 2018

FLZ015-026-027-115-127-282245-
Inland Franklin FL-Liberty FL-Coastal Wakulla FL-Coastal Franklin FL-
Inland Wakulla FL-
552 PM EDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR WAKULLA...SOUTHEASTERN LIBERTY
AND NORTHEASTERN FRANKLIN COUNTIES UNTIL 645 PM EDT...

At 552 PM EDT, Doppler radar was tracking a strong thunderstorm 10
miles southwest of Crawfordville, moving southeast at 10 mph.

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

Locations impacted include...
Carrabelle, St. Marks, Crawfordville, Sopchoppy, Shadeville, Wakulla
Springs, Panacea, Smith Creek, Medart, Buckhorn, Bethel, Liveoak
Island, Curtis Mill, Alligator Point, Saint Teresa, Turkey Point,
Bald Point, Hyde Park, Panacea-Wakulla Airport and Arran.

LAT...LON 3022 8468 3030 8446 3030 8436 3012 8412
      3001 8420 3001 8423 2995 8425 2987 8431
      2982 8465
TIME...MOT...LOC 2152Z 328DEG 10KT 3010 8449

15-HARRIGAN

Special weather statement, Jun 28, 6:31 PM EDT, 7 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
631 PM EDT THU JUN 28 2018

GAZ157-158-282315-
Grady GA-Thomas GA-
631 PM EDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GRADY AND SOUTHERN
THOMAS COUNTIES UNTIL 715 PM EDT...

At 631 PM EDT, Doppler radar was tracking a strong thunderstorm near
Thomasville, moving southeast at 10 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Thomasville, Cairo, Grady Co A/p, Dawesville, Pine Park, Newark,
Pasco and Eason.

LAT...LON 3088 8420 3094 8401 3077 8380 3068 8409
TIME...MOT...LOC 2231Z 323DEG 9KT 3085 8406

15-HARRIGAN

Local storm report, Jun 28, 6:36 PM EDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
636 PM EDT THU JUN 28 2018

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

0619 PM     TSTM WND DMG     2 W PANACEA-WAKULLA AIR 29.99N 84.42W
06/28/2018                   WAKULLA            FL   LAW ENFORCEMENT

            TREE DOWN ON SURF ROAD NEAR PELICAN WAY
            BLOCKING TRAFFIC.

&&

KGG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 2:09 AM EDT	Special Weather Statement	TAE	Madison	21 min
Jun 28, 5:00 PM EDT	Special Weather Statement	TAE	Calhoun	45 min
Jun 28, 5:32 PM EDT	Special Weather Statement	TAE	Gilchrist	43 min
Jun 28, 5:49 PM EDT	Special Marine Warning	TAE		86 min
Jun 28, 5:52 PM EDT	Special Weather Statement	TAE	Wakulla	53 min
Jun 28, 5:58 PM EDT	Severe Thunderstorm Warning	TAE	Franklin, Liberty, Wakulla	32 min
Jun 28, 7:06 PM EDT	Special Weather Statement	TAE	Gadsden, Madison	39 min
Jun 28, 7:17 PM EDT	Special Weather Statement	TAE	Holmes	43 min
Jun 28, 7:20 PM EDT	Severe Thunderstorm Warning	TAE	Gadsden, Jefferson, Leon	25 min
Jun 28, 7:38 PM EDT	Special Weather Statement	TAE	Gadsden, Jefferson, Leon, Madison	52 min
Jun 28, 7:41 PM EDT	Severe Thunderstorm Warning	TAE	Gadsden, Leon, Wakulla	37 min
Jun 28, 7:49 PM EDT	Special Weather Statement	TAE	Holmes, Walton, Washington	41 min
Jun 28, 7:54 PM EDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gadsden, Jackson, Liberty, Washington	51 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.