Alert archive / Florida / Rip Current Statements in 2017

Rip Current Statement 23, NWS Jacksonville, FL

December 29, 2017Duval County, Flagler County, Nassau County, Florida

NWS Jacksonville, FL issued this rip current statement at Dec 29, 2017, 3:31 AM EST for Duval County, Flagler County, Nassau County, Florida. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued
Dec 29, 2017, 3:31 AM EST (08:31 UTC)
Expired
Dec 29, 2017, 6:00 PM EST
In force
14 hr
Issued by
NWS Jacksonville, FL

Counties Duval County, FL, Flagler County, FL, Nassau County, FL

The radar

The Jacksonville radar (KJAX), 40 km from the middle of the area, began a volume at 08:35 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 00:00Z, 8.5 hours before the alert went out and 42 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, Jacksonville, FL at 00:00Z on 2017-12-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, Jacksonville, FL at 00:00Z on 2017-12-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 273 square meters per square second.1939587897117Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
437 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
273 m²/s²
0-3 km storm-relative helicity
388 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

833 
WHUS42 KJAX 290831
CFWJAX

Coastal Hazard Message
National Weather Service Jacksonville FL
331 AM EST Fri Dec 29 2017

FLZ033-038-124-125-292300-
/O.NEW.KJAX.RP.S.0023.171229T0831Z-171229T2300Z/
St. Johns-Flagler-Coastal Nassau-Coastal Duval-
331 AM EST Fri Dec 29 2017

...HIGH RIP CURRENT RISK IN EFFECT THROUGH THIS AFTERNOON...

The National Weather Service in Jacksonville has issued a High
Rip Current Risk, which is in effect through this afternoon. 

* TIMING...Through Late Afternoon.

* IMPACTS...Rough surf and dangerous rip currents will be life 
  threatening to any swimmer entering the chilly surf waters 
  today. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

There is a High Risk of rip currents.

Rip currents will be life threatening.

Rip currents are powerful channels of water flowing quickly away
from shore, which occur most often at low spots or breaks in the
sandbar and in the vicinity of structures such as groins, jetties
and piers. Heed the advice of lifeguards and the beach patrol.
Pay attention to flags and posted signs.

Swim near a lifeguard. If caught in a rip current remain calm.
Don't fight the current. Swim in a direction following the
shoreline. If unable to escape, face the shore and call or wave
for help. If tired, float or tread water until out of the rip
current.

&&

$$

Nearby

Rip Current Statements in Florida, 2017Every rip current statement 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.