Alert archive / Florida / High Surf Advisories in 2017

High Surf Advisory 5, NWS Jacksonville, FL

September 23, 2017Duval County, Flagler County, Florida

NWS Jacksonville, FL issued this high surf advisory at Sep 23, 2017, 9:30 AM EDT for Duval County, Flagler County, Florida. It took effect at Sep 23, 2017, 11:00 PM EDT. It was in force for 45 hr.

The area

The counties it named.

The facts

Issued
Sep 23, 2017, 9:30 AM EDT (13:30 UTC)
In effect from
Sep 23, 2017, 11:00 PM EDT
Expired
Sep 25, 2017, 8:00 PM EDT
In force
45 hr
Issued by
NWS Jacksonville, FL

Counties Duval County, FL, Flagler County, FL

The radar

The Jacksonville radar (KJAX), 68 km from the middle of the area, began a volume at 13:30 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, 1.5 hours before the alert went out and 261 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 2017-09-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 873 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 2017-09-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 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
873 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
758 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
74 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 23, 3:51 AM EDT, 5 hours 39 minutes earlier.

Area forecast discussion, Sep 23, 3:51 AM EDT, 5 hours 39 minutes before
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Hazardous weather outlook, Sep 23, 4:11 AM EDT, 5 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Jacksonville FL
411 AM EDT Sat Sep 23 2017

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-240815-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to
60 NM-
Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-
Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM-
Hamilton-Suwannee-Columbia-Baker-Inland Nassau-Inland Duval-Union-
Bradford-Clay-St. Johns-Gilchrist-Alachua-Putnam-Flagler-Marion-
Coastal Nassau-Coastal Duval-Coffee-Jeff Davis-Bacon-Appling-
Wayne-Atkinson-Ware-Pierce-Brantley-Inland Glynn-Coastal Glynn-
Echols-Clinch-Charlton-Inland Camden-Coastal Camden-
411 AM EDT Sat Sep 23 2017

...HIGH RISK OF RIP CURRENTS THIS WEEKEND AND EARLY NEXT WEEK...

...SMALL CRAFT ADVISORY FOR THE COASTAL WATERS...

...MINOR TO MODERATE RIVER AND COASTAL FLOODING CONTINUES...

This Hazardous Weather Outlook is for Northeast Florida,
Southeast Georgia and the Adjacent Coastal Waters.

.DAY ONE...Today and Tonight...
Scattered thunderstorms are possible across southeast Georgia and
northeast Florida. Locally heavy rainfall will be the primary
hazard, though a few strong thunderstorms could produce gusty
winds, frequent lightning strikes, and small hail.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...
High surf will continue to impact area beaches this weekend
through early next week, with a high risk of rip currents at area
beaches. Small Craft Advisories will remain in effect for the
coastal waters through at least early next week. Minor coastal
flooding and beach erosion will be possible at area beaches during
times of high tide this weekend and early next week.

Minor to moderate river flooding will continue in multiple river
basins this weekend. A coastal flood advisory will remain in
effect through at least Saturday evening for minor to moderate
flooding along the St Johns River basin during times of high tide.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

For additional information, visit the National Weather Service in
Jacksonville website on the internet at weather.gov/jax.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 23, 2:49 AM EDTRip Current StatementJAXDuval, Flagler, Nassau65 hr
Sep 23, 11:45 AM EDTSpecial Weather StatementJAXSaint Johns30 min
Sep 23, 3:11 PM EDTSpecial Weather StatementJAXLafayette49 min
Sep 23, 4:00 PM EDTSpecial Weather StatementJAXCitrus15 min
Sep 23, 4:16 PM EDTSevere Thunderstorm WarningJAXMarion32 min
Sep 23, 5:08 PM EDTSpecial Weather StatementJAXHamilton37 min
Sep 23, 5:23 PM EDTSpecial Weather StatementJAXHamilton37 min

Nearby

High Surf Advisories in Florida, 2017Every 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.