Alert archive / Florida / Rip Current Statements in 2017

Rip Current Statement 22, NWS Jacksonville, FL

December 28, 2017Duval County, Flagler County, Nassau County, Florida

NWS Jacksonville, FL issued this rip current statement at Dec 28, 2017, 4:42 AM EST for Duval County, Flagler County, Nassau County, Florida. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Dec 28, 2017, 4:42 AM EST (09:42 UTC)
Expired: Dec 28, 2017, 6:00 PM EST
In force: 13 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 09:42 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, 9.7 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-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: 3 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 437 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

640 
WHUS42 KJAX 280942
CFWJAX

Coastal Hazard Message
National Weather Service Jacksonville FL
442 AM EST Thu Dec 28 2017

FLZ033-038-124-125-282300-
/O.NEW.KJAX.RP.S.0022.171228T0942Z-171228T2300Z/
St. Johns-Flagler-Coastal Nassau-Coastal Duval-
442 AM EST Thu Dec 28 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 become 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.

&&

$$

1 follow-up statement

351 
WHUS42 KJAX 282302
CFWJAX

Coastal Hazard Message
National Weather Service Jacksonville FL
602 PM EST Thu Dec 28 2017


FLZ033-038-124-125-290015-
/O.EXP.KJAX.RP.S.0022.000000T0000Z-171228T2300Z/
St. Johns-Flagler-Coastal Nassau-Coastal Duval-
602 PM EST Thu Dec 28 2017

...HIGH RIP CURRENT RISK HAS EXPIRED...

$$

Nearby

Rip Current Statements in Florida, 2017 Every 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.