Alert archive / Florida / High Surf Advisories in 2017

High Surf Advisory 7, NWS Jacksonville, FL

September 30, 2017Duval County, Flagler County, Nassau County, Florida; Camden County, Glynn County, Georgia

NWS Jacksonville, FL issued this high surf advisory at Sep 30, 2017, 7:13 PM EDT for Duval County, Flagler County, Nassau County, Florida; Camden County, Glynn County, Georgia. It took effect at Sep 30, 2017, 8:00 PM EDT. It was in force for 31 hr.

The area

The counties it named.

The facts

Issued: Sep 30, 2017, 7:13 PM EDT (23:13 UTC)
In effect from: Sep 30, 2017, 8:00 PM EDT
Expired: Oct 2, 2017, 3:19 AM EDT
In force: 31 hr
Issued by: NWS Jacksonville, FL

Counties Duval County, FL, Flagler County, FL, Nassau County, FL, Camden County, GA, Glynn County, GA

The radar

The Jacksonville radar (KJAX), 13 km from the middle of the area, began a volume at 23:13 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, 11.2 hours before the alert went out and 13 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: 1376 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 7 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 high surf advisory 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 high surf advisory went out at Sep 30, 3:15 PM EDT, 3 hours 58 minutes earlier.

Area forecast discussion, Sep 30, 3:15 PM EDT, 3 hours 58 minutes before

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Hazardous weather outlook, Sep 30, 3:00 PM EDT, 4 hours 13 minutes before

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In the hours before

Special weather statement, Sep 30, 1:49 PM EDT, 5 hours 24 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
149 PM EDT SAT SEP 30 2017

FLZ124-125-GAZ166-301815-
Coastal Duval FL-Coastal Nassau FL-Coastal Camden GA-
149 PM EDT SAT SEP 30 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL NASSAU AND
NORTHEASTERN DUVAL COUNTIES UNTIL 215 PM EDT...

At 147 PM EDT, Doppler radar was tracking showers and a thunderstorm
over Fernandina Beach, moving southwest at 10 to 15 mph.

Wind gusts of 35 to 45 mph can be expected along with possible minor
damage. Loose outdoor objects may become wind blown projectiles.
Heavy rainfall will produce ponding of water on roadways and minor
flooding of low lying areas. Please remain indoors and stay away
from windows if you are in the path of this rain band.

Locations impacted include...
Fernandina Beach and Yulee.

LAT...LON 3048 8144 3060 8163 3075 8145 3072 8141
      3054 8139
TIME...MOT...LOC 1747Z 040DEG 9KT 3065 8145

SHASHY

Local storm report, Sep 30, 5:05 PM EDT, 2 hours 8 minutes before

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Local storm report, Sep 30, 5:58 PM EDT, 1 hour 15 minutes before

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Local storm report, Sep 30, 6:36 PM EDT, 37 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
Sep 30, 2:39 AM EDT	Rip Current Statement	JAX	Duval, Flagler, Nassau	6 days
Sep 30, 12:16 PM EDT	Coastal Flood Advisory	JAX	Duval, Flagler	20 hr
Sep 30, 12:42 PM EDT	Gale Warning	JAX		39 hr
Sep 30, 1:05 PM EDT	Areal Flood Advisory	JAX	Nassau	55 min
Sep 30, 1:49 PM EDT	Special Weather Statement	JAX	Nassau	26 min
Sep 30, 2:00 PM EDT	Areal Flood Advisory	JAX	Nassau	90 min
Sep 30, 2:05 PM EDT	Areal Flood Advisory	JAX	Saint Johns	55 min
Sep 30, 2:09 PM EDT	Special Marine Warning	JAX		96 min
Sep 30, 2:14 PM EDT	Wind Advisory	JAX	Duval, Flagler, Nassau	30 hr
Sep 30, 3:22 PM EDT	Areal Flood Advisory	JAX	Saint Johns	113 min
Sep 30, 3:45 PM EDT	Special Marine Warning	JAX		90 min
Sep 30, 4:53 PM EDT	Areal Flood Warning	JAX	Saint Johns	3 hr
Sep 30, 7:37 PM EDT	Small Craft Advisory	JAX		5 days

Nearby

High Surf Advisories in Florida, 2017 High Surf Advisories in Georgia, 2017 Every high surf advisory in 2017

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.