Alert archive / Florida / High Surf Advisories in 2021
High Surf Advisory 7, NWS Miami, FL
NWS Miami, FL issued this high surf advisory at Nov 20, 2021, 3:31 PM EST for Palm Beach County, Florida. It took effect at Nov 20, 2021, 7:00 PM EST. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Nov 20, 2021, 3:31 PM EST (20:31 UTC)
- In effect from
- Nov 20, 2021, 7:00 PM EST
- Expired
- Nov 21, 2021, 7:00 AM EST
- In force
- 12 hr
- Issued by
- NWS Miami, FL
County Palm Beach County, FL
The radar
The Miami radar (KAMX), 115 km from the middle of the area, began a volume at 20:35 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
Miami, FL (KMFL), launched 12:00Z, 8.5 hours before the alert went out and 93 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.
- Mixed-layer CAPE
- 56 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 799 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted.
645 WHUS42 KMFL 202031 CFWMFL Coastal Hazard Message National Weather Service Miami FL 331 PM EST Sat Nov 20 2021 FLZ168-210445- /O.NEW.KMFL.SU.Y.0007.211121T0000Z-211121T1800Z/ /O.CON.KMFL.RP.S.0037.000000T0000Z-211122T0000Z/ Coastal Palm Beach- 331 PM EST Sat Nov 20 2021 ...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY EVENING... ...HIGH SURF ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 1 PM EST SUNDAY... * WHAT...For the High Surf Advisory, large breaking waves of 5 to 7 feet expected in the surf zone. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Palm Beach County. * WHEN...For the High Surf Advisory, from 7 PM this evening to 1 PM EST Sunday. For the High Rip Current Risk, through Sunday evening. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help. && $$ FLZ172-173-210445- /O.CON.KMFL.RP.S.0037.000000T0000Z-211122T0000Z/ Coastal Broward-Coastal Miami-Dade- 331 PM EST Sat Nov 20 2021 ...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH SUNDAY EVENING... * WHAT...Dangerous rip currents. * WHERE...Coastal Broward and Coastal Miami-Dade Counties. * WHEN...Through Sunday evening. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water. PRECAUTIONARY/PREPAREDNESS ACTIONS... Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help. && $$
1 follow-up statement
052 WHUS42 KMFL 210718 CFWMFL Coastal Hazard Message National Weather Service Miami FL 218 AM EST Sun Nov 21 2021 FLZ168-220000- /O.EXT.KMFL.SU.Y.0007.000000T0000Z-211121T1200Z/ /O.CON.KMFL.RP.S.0037.000000T0000Z-211122T0000Z/ Coastal Palm Beach- 218 AM EST Sun Nov 21 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 7 AM EST THIS MORNING... ...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH THIS EVENING... * WHAT...For the High Surf Advisory, large breaking waves of 5 to 7 feet expected in the surf zone. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Palm Beach County. * WHEN...For the High Surf Advisory, until 7 AM EST this morning. For the High Rip Current Risk, through this evening. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help. && $$ FLZ172-173-220000- /O.CON.KMFL.RP.S.0037.000000T0000Z-211122T0000Z/ Coastal Broward-Coastal Miami-Dade- 218 AM EST Sun Nov 21 2021 ...HIGH RIP CURRENT RISK REMAINS IN EFFECT THROUGH THIS EVENING... * WHAT...Dangerous rip currents. * WHERE...Coastal Broward and Coastal Miami-Dade Counties. * WHEN...Through Sunday evening. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water. PRECAUTIONARY/PREPAREDNESS ACTIONS... Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help. && $$ Baxter
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 20, 9:44 AM EST | Wind Advisory | MFL | Broward, Miami-Dade, Palm Beach | 14 hr |
Nearby
High Surf Advisories in Florida, 2021Every high surf advisory in 2021
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.