Alert archive / Florida / Rip Current Statements in 2018

Rip Current Statement 26, NWS Jacksonville, FL

September 23, 2018Duval County, Flagler County, Nassau County, Florida

NWS Jacksonville, FL issued this rip current statement at Sep 23, 2018, 10:50 AM EDT for Duval County, Flagler County, Nassau County, Florida. It took effect at Sep 23, 2018, 11:00 AM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Sep 23, 2018, 10:50 AM EDT (14:50 UTC)
In effect from: Sep 23, 2018, 11:00 AM EDT
Expired: Sep 23, 2018, 8:00 PM EDT
In force: 9 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 14:50 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, 2.8 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: 541 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 829 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: -21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

361 
WHUS42 KJAX 231450
CFWJAX

Coastal Hazard Message
National Weather Service Jacksonville FL
1050 AM EDT Sun Sep 23 2018

FLZ124-125-133-138-240000-
/O.NEW.KJAX.RP.S.0026.180923T1500Z-180924T0000Z/
Coastal Nassau-Coastal Duval-Coastal St. Johns-Coastal Flagler-
1050 AM EDT Sun Sep 23 2018

...HIGH RIP CURRENT RISK IN EFFECT UNTIL 8 PM EDT THIS EVENING...

The National Weather Service in Jacksonville has issued a High
Rip Current Risk, which is in effect until 8 PM EDT this evening.

* SURF AND RIP CURRENT RISK...Surf of around 3 feet and a high
  risk of rip currents today. The surf may be hazardous at times 
  for weaker swimmers and rip currents will be life threatening.

* TIMING...Until This Evening. Rip currents may be worse around
  the 11 AM to 4 PM time frame.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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, 2018 Every rip current 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.