Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 124, NWS Jacksonville, FL

August 11, 2019Clay County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 11, 2019, 6:27 PM EDT for Clay County, Florida. It was in force for 13 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 11, 2019, 6:27 PM EDT (22:27 UTC)
Expired: Aug 11, 2019, 6:40 PM EDT
In force: 13 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Clay County, FL

The radar

The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 22:28 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 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 11, 3:09 PM EDT, 3 hours 18 minutes earlier.

Area forecast discussion, Aug 11, 3:09 PM EDT, 3 hours 18 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
309 PM EDT Sun Aug 11 2019

.NEAR TERM /Through Tonight/...
Fairly similar environment this afternoon compared to yesterday,
so expecting good coverage of showers and storms, with isolated
strong/severe with strong wind gusts. Activity should move slowly
E or SE given weak W to NW steering flow aloft. Will continue heat
advisory this afternoon until 6pm, when heat index values drop as
temperatures start to drop.

Like last night, expect convective precipitation to last through
about Midnight, then partly cloudy skies with low temperatures in
the mid 70s inland, upper 70s coast.

.SHORT TERM /Monday through Tuesday night/...
Strong upper ridge aloft will be stationary over southern Plains
and Gulf Coast states during this period. Surface trough of low
pressure will remain along FL/GA border, while daily sea breezes
push well inland both days. These boundaries should support
scattered to numerous showers and thunderstorms during the
afternoon and evening hours, some with very heavy rainfall and
strong winds. Focusing highest POPs where these boundaries merge.

Latest guidance suggests slightly lower high temperatures each day
eastern counties, though still quite hot interior areas with
upper ridge over the area. Heat index values will approach heat
advisory criteria midday before potentially some slight mix-down
of dew points in the afternoon. Will hold off on advisory issuance
to let night shift look at latest guidance. Expect slightly above
normal temperatures this period, especially at night buoyed by
abnormally high dew points.

.LONG TERM /Wednesday through Sunday/...
As we've seen throughout the warm season, upper pattern reverts
back to western ridge/eastern trough during this period, though
by the weekend, upper trough shifts off east coast as upper ridge
expands eastward across central U.S. Generally near or slightly
above normal temperatures this period.

Looks fairly stormy this period with weak upper troughing over
our area, re-establishing surface trough of low pressure over
central GA, which along with sea breezes will promote scattered
to numerous afternoon showers/storms each day.

&&

.AVIATION...VFR conditions are expected through this evening,
except locally lower conditions with strong winds expected with
scattered to numerous showers/storms Monday afternoon. Similar
to early this morning, could see areas of MVFR/IFR CIGs develop,
particularly across ne FL.

&&

.MARINE...High pressure will remain well east of the waters, with
low pressure to the west, maintaining a daily southerly flow
across the waters, with more southeasterly flow each afternoon
nearshore with sea breeze. Winds and seas are expected to remain
below advisory criteria this forecast period.

Rip Currents: Moderate risk ne FL, Low risk se GA.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  76  93  74  95 /  30  40  20  20
SSI  78  90  78  90 /  20  30  10  20
JAX  76  92  76  92 /  40  50  20  40
SGJ  76  90  76  90 /  30  50  20  50
GNV  76  92  75  92 /  50  70  40  60
OCF  76  92  75  90 /  30  60  30  60

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Heat Advisory until 6 PM EDT this evening for Baker-Bradford-
     Central Marion-Clay-Coastal Duval-Coastal Flagler-Coastal
     Nassau-Coastal St. Johns-Eastern Alachua-Eastern Marion-
     Gilchrist-Hamilton-Inland Duval-Inland Flagler-Inland
     Nassau-Inland St. Johns-Northern Columbia-Putnam-Southern
     Columbia-Suwannee-Union-Western Alachua-Western Marion.

GA...Heat Advisory until 6 PM EDT this evening for Appling-Atkinson-
     Bacon-Brantley-Clinch-Coastal Camden-Coastal Glynn-Coffee-
     Echols-Inland Camden-Inland Glynn-Jeff Davis-Northeastern
     Charlton-Northern Ware-Pierce-Southern Ware-Wayne-Western
     Charlton.

AM...None.
&&

Wolf/Cordero/Bricker

In the hours before

Special weather statement, Aug 11, 5:08 PM EDT, 1 hour 19 minutes before

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Special weather statement, Aug 11, 5:28 PM EDT, 59 minutes before

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Special weather statement, Aug 11, 5:29 PM EDT, 58 minutes before

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Special weather statement, Aug 11, 6:00 PM EDT, 27 minutes before

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Special weather statement, Aug 11, 6:13 PM EDT, 14 minutes before

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Special weather statement, Aug 11, 6:24 PM EDT, 3 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 8:22 PM EDT	Areal Flood Advisory	JAX	Baker, Clay, Duval, Nassau	113 min
Aug 10, 8:49 PM EDT	Special Weather Statement	JAX	Nassau	41 min
Aug 10, 8:54 PM EDT	Areal Flood Advisory	JAX	Clay, Duval	96 min
Aug 10, 9:06 PM EDT	Special Marine Warning	JAX		89 min
Aug 10, 9:32 PM EDT	Special Weather Statement	JAX	Nassau	43 min
Aug 10, 9:33 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	27 min
Aug 10, 9:40 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	95 min
Aug 10, 9:44 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	46 min
Aug 11, 3:55 AM EDT	Heat Advisory	JAX	Alachua, Baker, Bradford, Duval, Flagler, Gilchrist and 4 more	14 hr
Aug 11, 5:29 PM EDT	Special Weather Statement	JAX	Saint Johns	31 min
Aug 11, 6:13 PM EDT	Special Weather Statement	JAX	Clay	47 min
Aug 11, 6:24 PM EDT	Special Weather Statement	JAX	Putnam	51 min
Aug 11, 6:30 PM EDT	Areal Flood Warning	JAX	Bradford, Clay	2 hr
Aug 11, 6:43 PM EDT	Special Weather Statement	JAX	Clay	47 min
Aug 11, 6:48 PM EDT	Special Weather Statement	JAX	Nassau	42 min
Aug 11, 7:04 PM EDT	Special Weather Statement	JAX	Duval	41 min
Aug 11, 7:29 PM EDT	Special Weather Statement	JAX	Duval	46 min
Aug 11, 7:33 PM EDT	Areal Flood Warning	JAX	Clay, Duval	117 min
Aug 11, 7:45 PM EDT	Special Weather Statement	JAX	Duval	45 min
Aug 11, 7:55 PM EDT	Areal Flood Warning	JAX	Duval, Nassau	2 hr
Aug 10, 8:06 PM EDT	Special Weather Statement	JAX	Atkinson	39 min
Aug 10, 8:16 PM EDT	Special Weather Statement	JAX	Brantley	44 min
Aug 10, 8:42 PM EDT	Special Weather Statement	JAX	Atkinson, Clinch, Echols, Ware	48 min
Aug 10, 8:59 PM EDT	Special Weather Statement	JAX	Camden	46 min
Aug 10, 9:28 PM EDT	Special Weather Statement	JAX	Brantley, Clinch, Ware	47 min
Aug 10, 9:30 PM EDT	Special Weather Statement	JAX	Camden	45 min
Aug 10, 9:51 PM EDT	Areal Flood Advisory	JAX	Camden, Charlton	84 min
Aug 10, 9:54 PM EDT	Areal Flood Advisory	JAX	Charlton, Clinch, Ware	96 min
Aug 10, 10:28 PM EDT	Special Weather Statement	JAX	Brantley, Charlton	32 min
Aug 11, 5:08 PM EDT	Special Weather Statement	JAX	Brantley	52 min
Aug 11, 5:28 PM EDT	Special Weather Statement	JAX	Wayne	47 min
Aug 11, 6:00 PM EDT	Special Weather Statement	JAX	Camden	45 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019 Every severe thunderstorm warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.