Alert archive / Florida / Special Weather Statements in 2018

Special Weather Statement, NWS Jacksonville, FL

August 14, 2018Saint Johns County, Florida

NWS Jacksonville, FL issued this special weather statement at Aug 14, 2018, 2:21 PM EDT for Saint Johns County, Florida. It was in force for 39 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: Aug 14, 2018, 2:21 PM EDT (18:21 UTC)
Expired: Aug 14, 2018, 3:00 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 96 km from the middle of the area, began a volume at 18:24 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, 6.4 hours before the alert went out and 97 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: 960 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 849 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: -9 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 Aug 14, 10:27 AM EDT, 3 hours 54 minutes earlier.

Area forecast discussion, Aug 14, 10:27 AM EDT, 3 hours 54 minutes before

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In the hours before

Special weather statement, Aug 14, 2:21 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
Aug 14, 2:02 PM EDT	Special Marine Warning	JAX		58 min
Aug 14, 2:22 PM EDT	Special Marine Warning	JAX		53 min
Aug 14, 2:54 PM EDT	Special Marine Warning	JAX		66 min
Aug 14, 3:36 PM EDT	Special Marine Warning	JAX		54 min
Aug 14, 4:09 PM EDT	Areal Flood Advisory	JAX	Hamilton, Suwannee	2 hr
Aug 14, 4:35 PM EDT	Special Weather Statement	JAX	Nassau	40 min
Aug 14, 4:44 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	22 min
Aug 14, 4:47 PM EDT	Special Marine Warning	JAX		20 min
Aug 14, 5:35 PM EDT	Special Weather Statement	JAX	Clay	40 min
Aug 14, 4:30 PM EDT	Special Weather Statement	JAX	Glynn	45 min
Aug 14, 5:00 PM EDT	Areal Flood Advisory	JAX	Camden	2 hr
Aug 14, 6:03 PM EDT	Areal Flood Advisory	JAX	Wayne	117 min
Aug 14, 6:38 PM EDT	Areal Flood Advisory	JAX	Appling, Wayne	2 hr
Aug 14, 6:42 PM EDT	Special Weather Statement	JAX	Atkinson	48 min
Aug 14, 7:14 PM EDT	Special Weather Statement	JAX	Appling	46 min
Aug 14, 7:25 PM EDT	Areal Flood Advisory	JAX	Atkinson, Coffee	2 hr
Aug 14, 7:41 PM EDT	Areal Flood Advisory	JAX	Coffee, Jeff Davis	2 hr
Aug 14, 7:49 PM EDT	Special Weather Statement	JAX	Jeff Davis	41 min

Nearby

Special Weather Statements in Florida, 2018 Every special weather statement 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.