Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

June 14, 2021Nassau County, Florida

NWS Jacksonville, FL issued this special weather statement at Jun 14, 2021, 5:45 PM EDT for Nassau County, Florida. It was in force for 30 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 14, 2021, 5:45 PM EDT (21:45 UTC)
Expired: Jun 14, 2021, 6:15 PM EDT
In force: 30 min
Issued by: NWS Jacksonville, FL

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 30 km from the middle of the area, began a volume at 21:48 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

Jacksonville, FL (KJAX), launched 12:00Z, 9.8 hours before the alert went out and 29 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: 393 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 597 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 9 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

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jun 14, 3:32 PM EDT, 2 hours 13 minutes earlier.

Area forecast discussion, Jun 14, 3:32 PM EDT, 2 hours 13 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
332 PM EDT Mon Jun 14 2021

.Short Term.../through Wednesday/...

Dissipating frontal boundary stretched east to west across area near
the GA/FL line this afternoon. Areas along and south of this
boundary will experience the greatest chance for showers and storms
Today, due to better moisture. Storms will be possible across SE GA
this afternoon north of the boundary, but the best chance for
activity will be near the coast in SE GA due to convergence along
the east coast sea breeze. The storms are expected to be slow
movers, so in addition to the potential for a few strong storms,
heavy rainfall is also expected with localized flooding possible.
The activity will decrease in coverage toward midnight.

Another trough will move into the southeastern US Tonight into
Tuesday morning, and enter SE GA in the afternoon. With a prevailing
flow from the southwest the east coast sea breeze will be pinned
pretty close to the coast. Best chance for convection across NE FL
as west coast sea breeze moves inland, acting as a source of
convergence in the diurnally unstable airmass. Organized convection
could stretch up the east coast of SE GA as well. The convective
activity will dissipate Tuesday evening.

For Wednesday, trough will sink a little further to the south.
Closer to the FL/GA line. Drier air will move into SE GA behind the
boundary, helping to limit best chance for convection over NE FL and
coastal SE GA.

Lows will be near to a little above normal this period. Highs will
trend above normal across SE GA Tuesday and Wednesday, but near to a
little lower closer to central FL, due to cooling from cloud and
shower coverage.

&&

.Long Term.../Wednesday night through Monday/...

Boundary will linger over the area into Thursday as it dissipates.
High pressure will build to the east Friday into Saturday, with
troughing to the north. An area of low pressure will track to the
west then northwest of the area Sunday into Monday. Precipitation
chances will be more limited into Saturday, with chances increasing
late in the weekend into next week.

Lows will trend near normal this period. Highs will be above normal
over SE GA Thursday and Friday, and near to a little below over NE
FL. Over the weekend into early next week, highs will be near to a
little below normal.

&&

.Marine...

A dissipating frontal boundary will linger over the area into
Tonight. Another trough will move into region from the north
Tuesday, then stall over area Wednesday into Thursday. A weak ridge
will build to the east Friday into Saturday. Low pressure will track
to the west then northwest of the region Sunday into Monday.

Rip Currents: SE GA: Low through Tuesday
              NE FL: Low through Tuesday

&&

.PRELIMINARY POINT TEMPS/POPS...

AMG  72  95  70  92  68 /  10  20  20  20  10
SSI  74  92  75  89  74 /  20  30  30  20  20
JAX  72  94  73  91  71 /  30  60  30  40  20
SGJ  72  93  73  89  72 /  40  70  20  40  20
GNV  72  90  73  88  71 /  30  60  40  50  20
OCF  72  89  74  88  72 /  40  30  30  40  30

&&

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

In the hours before

Special weather statement, Jun 14, 4:18 PM EDT, 1 hour 27 minutes before

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Special weather statement, Jun 14, 4:36 PM EDT, 1 hour 9 minutes before

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Special weather statement, Jun 14, 5:08 PM EDT, 37 minutes before

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Special weather statement, Jun 14, 5:11 PM EDT, 34 minutes before

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Special weather statement, Jun 14, 5:19 PM EDT, 26 minutes before

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Special weather statement, Jun 14, 5:45 PM EDT, 0 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
Jun 14, 12:28 PM EDT	Special Weather Statement	JAX	Alachua	47 min
Jun 14, 1:28 PM EDT	Special Weather Statement	JAX	Duval	32 min
Jun 14, 1:33 PM EDT	Special Weather Statement	JAX	Putnam	42 min
Jun 14, 1:38 PM EDT	Special Weather Statement	JAX	Saint Johns	52 min
Jun 14, 1:42 PM EDT	Special Marine Warning	JAX		63 min
Jun 14, 1:48 PM EDT	Special Weather Statement	JAX	Bradford	42 min
Jun 14, 2:05 PM EDT	Special Weather Statement	JAX	Bradford	40 min
Jun 14, 2:08 PM EDT	Special Weather Statement	JAX	Flagler	37 min
Jun 14, 2:15 PM EDT	Special Weather Statement	JAX	Duval	45 min
Jun 14, 2:38 PM EDT	Areal Flood Warning	JAX	Clay, Duval, Saint Johns	63 min
Jun 14, 2:42 PM EDT	Special Weather Statement	JAX	Flagler	48 min
Jun 14, 3:07 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	38 min
Jun 14, 3:14 PM EDT	Special Marine Warning	JAX		91 min
Jun 14, 3:39 PM EDT	Areal Flood Warning	JAX	Flagler	2 hr
Jun 14, 3:47 PM EDT	Special Weather Statement	JAX	Clay	43 min
Jun 14, 4:02 PM EDT	Special Weather Statement	JAX	Alachua	43 min
Jun 14, 4:18 PM EDT	Special Weather Statement	JAX	Alachua	57 min
Jun 14, 4:36 PM EDT	Special Weather Statement	JAX	Nassau	39 min
Jun 14, 5:08 PM EDT	Special Weather Statement	JAX	Nassau	52 min
Jun 14, 5:11 PM EDT	Special Weather Statement	JAX	Nassau	34 min
Jun 14, 5:19 PM EDT	Special Weather Statement	JAX	Marion	41 min
Jun 14, 6:00 PM EDT	Special Weather Statement	JAX	Marion	45 min
Jun 14, 7:15 PM EDT	Special Weather Statement	JAX	Suwannee	45 min
Jun 14, 2:34 AM EDT	Special Weather Statement	JAX	Glynn	56 min
Jun 14, 6:25 PM EDT	Special Weather Statement	JAX	Brantley	50 min

Nearby

Special Weather Statements in Florida, 2021 Every special weather statement in 2021

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.