Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 210, NWS Jacksonville, FL

August 28, 2018Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 28, 2018, 5:24 PM EDT for Marion County, Florida. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 28, 2018, 5:24 PM EDT (21:24 UTC)
Expired
Aug 28, 2018, 6:15 PM EDT
In force
51 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 21:27 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.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 9.4 hours before the alert went out and 171 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-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2018-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1166 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2018-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1166 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
967 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 2:18 PM EDT, 3 hours 6 minutes earlier.

Area forecast discussion, Aug 28, 2:18 PM EDT, 3 hours 6 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
218 PM EDT Tue Aug 28 2018

.Near Term.../through Wednesday/...

High pressure will be centered to the Northeast this period.
Convection is expected to focus inland this afternoon, as that area
has been largely cloud free this morning, allowing destabilization.
In addition, with the cloud shield over the coast, a differential
heating boundary could enhance this activity as the boundary pushes
West in the flow. With loss of heating, convection will dissipate
inland Tonight, while activity initiates over the relatively warmer
Western Atlantic waters. These showers could provide for coastal
showers Overnight into Wednesday morning. The coastal showers will
push inland and strengthen into storms Wednesday. This activity
will then slowly move to the West through the afternoon and
evening on Wednesday.

Above normal temperatures Tonight, with near normal readings
expected for Wednesday.

&&

.Short Term.../Wednesday night through Saturday/...

High pressure will remain centered to the Northeast this period,
yielding a continued onshore flow pattern. In this pattern expect
shower activity focused near the coast in the morning hours, with
activity moving inland through the day and strengthening into
thunderstorms for the afternoon and evening hours. Much of the day
time convection which develops will dissipate at night with loss
of diurnal heating. A few coastal showers will be possible each
night.

High temperatures will trend near normal this period, with above
normal lows.

&&

.Long Term.../Saturday night through Tuesday/...

High pressure will remain centered to the Northeast this period.
This will continue the moist onshore flow pattern, with morning
coastal showers and afternoon and evening inland showers and storms.
The long term models depict a wave or possible low moving near or
over South Florida in the Monday into Tuesday timeframe. The
proximity of this system could lead to increased precipitation
chances late this period.

Highs will trend near normal this period, with lows generally above
normal.

&&

.Marine...

High pressure will be centered to the Northeast through the weekend,
yielding a prevailing onshore flow.

Rip Currents: Moderate risk through at least Thursday.

&&

.AVIATION...

Prevailing easterly flow increasing this afternoon with just light
stratiform rain impacting coastal terminals in the wake of
morning storms. Showers and thunderstorms were starting to pop
farther inland between the Highway 301 and I-75 corridors, with a
TEMPO group included for TS at GNV through early evening. Coastal
terminals will see improving conditions through the evening as
rain gradually tappers off, however, another batch of rainfall
offshore of the Cape could near SGJ between 00-06Z this evening,
and included VCSH for this terminal. After midnight, more coastal
shower and isolated t'storm development is expected which could
bring restrictions in rainfall through 12Z Wed to SSI, CRG and
SGJ. Farther inland, MVFR due to shallow ground fog is possible
near VQQ and GNV, but confidence low at this time so refrained
from inclusion in TAF.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  73  91  73  91 /  20  20  10  30
SSI  78  85  76  88 /  30  30  10  20
JAX  74  89  74  91 /  20  30  10  30
SGJ  76  87  74  88 /  20  30  10  20
GNV  74  90  73  91 /  20  50  10  40
OCF  72  90  73  91 /  40  60  10  50

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...None.
&&

In the hours before

Special weather statement, Aug 28, 2:52 PM EDT, 2 hours 32 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
252 PM EDT TUE AUG 28 2018

FLZ020-021-GAZ162-281930-
Hamilton FL-Suwannee FL-Echols GA-
252 PM EDT TUE AUG 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SUWANNEE...
NORTHWESTERN HAMILTON AND WESTERN ECHOLS COUNTIES UNTIL 330 PM EDT...

At 251 PM EDT, Doppler radar was tracking a strong thunderstorm near
Lake Park, moving northwest at 20 mph.

Excessive cloud-to-ground lightning and wind gusts of 40 to 50 mph
can be expected along with possible minor damage.

Locations impacted include...
Jennings, Suwannee River State Park, Blue Springs and Crossroads.

LAT...LON 3063 8314 3066 8313 3053 8297 3032 8318
      3035 8321 3035 8319 3038 8319 3039 8317
      3040 8318 3041 8318 3042 8322 3046 8322
      3047 8324 3052 8324 3055 8326 3059 8326
      3062 8327 3063 8331
TIME...MOT...LOC 1851Z 120DEG 15KT 3062 8321

PETERSON
Special weather statement, Aug 28, 4:06 PM EDT, 1 hour 18 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
406 PM EDT TUE AUG 28 2018

FLZ035-282045-
Gilchrist FL-
406 PM EDT TUE AUG 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL AND WESTERN GILCHRIST
COUNTY UNTIL 445 PM EDT...

At 405 PM EDT, Doppler radar was tracking a strong thunderstorm over
Bell, moving northwest at 25 mph.

Excessive cloud-to-ground lightning and wind gusts of 40 to 50 mph
can be expected along with possible minor damage.

Locations impacted include...
Bell.

LAT...LON 2970 8296 2970 8294 2972 8296 2972 8294
      2973 8295 2974 8294 2975 8294 2976 8295
      2977 8295 2980 8292 2980 8293 2981 8293
      2983 8292 2983 8289 2989 8288 2977 8275
      2963 8277 2967 8296
TIME...MOT...LOC 2005Z 114DEG 23KT 2972 8288

PETERSON
Special weather statement, Aug 28, 4:49 PM EDT, 35 minutes before
Special Weather Statement
National Weather Service Jacksonville FL
449 PM EDT TUE AUG 28 2018

FLZ040-282130-
Marion FL-
449 PM EDT TUE AUG 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MARION COUNTY UNTIL
530 PM EDT...

At 448 PM EDT, Doppler radar was tracking a strong thunderstorm over
Weirsdale, or near The Villages, moving northwest at 10 mph.

Excessive cloud-to-ground lightning and wind gusts of 40 to 50 mph
can be expected along with possible minor damage.

Locations impacted include...
Weirsdale, Ocklawaha, Moss Bluff, Silver Springs Shores, Lake Weir,
Belleview and Summerfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2905 8212 2917 8196 2902 8175 2896 8181
      2896 8200
TIME...MOT...LOC 2048Z 131DEG 8KT 2900 8189

PETERSON
Special weather statement, Aug 28, 5:16 PM EDT, 8 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 2:52 PM EDTSpecial Weather StatementJAXHamilton38 min
Aug 28, 4:06 PM EDTSpecial Weather StatementJAXGilchrist39 min
Aug 28, 4:45 PM EDTAreal Flood AdvisoryJAXGilchrist2 hr
Aug 28, 4:49 PM EDTSpecial Weather StatementJAXMarion41 min
Aug 28, 4:54 PM EDTSevere Thunderstorm WarningJAXSuwannee51 min
Aug 28, 5:16 PM EDTSpecial Weather StatementJAXMarion44 min
Aug 28, 5:27 PM EDTSpecial Weather StatementJAXGilchrist48 min
Aug 28, 6:05 PM EDTSpecial Weather StatementJAXGilchrist40 min
Aug 28, 6:21 PM EDTSpecial Weather StatementJAXAlachua39 min
Aug 28, 6:45 PM EDTSpecial Weather StatementJAXHamilton45 min
Aug 28, 9:49 AM EDTAreal Flood AdvisoryJAXGlynn116 min

Nearby

Severe Thunderstorm Warnings in Florida, 2018Every 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.