Alert archive / Massachusetts / High Surf Advisories in 2021
High Surf Advisory 1, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this high surf advisory at Aug 5, 2021, 3:14 AM EDT for Newport County, Washington County, Rhode Island; Bristol County, Dukes County, Nantucket County, Massachusetts. It took effect at Aug 5, 2021, 6:00 AM EDT. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Aug 5, 2021, 3:14 AM EDT (07:14 UTC)
- In effect from
- Aug 5, 2021, 6:00 AM EDT
- Expired
- Aug 5, 2021, 8:00 PM EDT
- In force
- 14 hr
- Issued by
- NWS Boston/Norton, MA
Counties Bristol County, MA, Dukes County, MA, Nantucket County, MA, Newport County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 57 km from the middle of the area, began a volume at 07:13 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
Brookhaven, NY (KOKX), launched 00:00Z, 7.2 hours before the alert went out and 174 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 591 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
177 WHUS41 KBOX 050714 CFWBOX Coastal Hazard Message National Weather Service Boston/Norton MA 314 AM EDT Thu Aug 5 2021 MAZ020-023-024-RIZ006>008-052015- /O.NEW.KBOX.SU.Y.0001.210805T1000Z-210806T0000Z/ Southern Bristol MA-Dukes MA-Nantucket MA-Washington RI- Newport RI-Block Island RI- 314 AM EDT Thu Aug 5 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Large breaking waves of 6 to 8 feet expected in the surf zone. * WHERE...In Massachusetts, Southern Bristol MA, Dukes MA and Nantucket MA Counties. In Rhode Island, Washington RI, Newport RI and Block Island RI Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Dangerous swimming and surfing conditions expected. 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. && $$
2 follow-up statements
742 WHUS41 KBOX 051848 CFWBOX Coastal Hazard Message National Weather Service Boston/Norton MA 248 PM EDT Thu Aug 5 2021 MAZ020-023-024-RIZ006>008-060000- /O.CON.KBOX.SU.Y.0001.000000T0000Z-210806T0000Z/ Southern Bristol MA-Dukes MA-Nantucket MA-Washington RI- Newport RI-Block Island RI- 248 PM EDT Thu Aug 5 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Large breaking waves of 6 to 8 feet expected in the surf zone. * WHERE...In Massachusetts, Southern Bristol MA, Dukes MA and Nantucket MA Counties. In Rhode Island, Washington RI, Newport RI and Block Island RI Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Dangerous swimming and surfing conditions expected. Rip currents can sweep even the best swimmers away from shore into deeper water. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && $$
865 WHUS41 KBOX 060003 CFWBOX Coastal Hazard Message National Weather Service Boston/Norton MA 803 PM EDT Thu Aug 5 2021 MAZ023-024-RIZ006>008-061315- /O.EXP.KBOX.SU.Y.0001.000000T0000Z-210806T0000Z/ /O.NEW.KBOX.RP.S.0005.210806T1200Z-210807T0000Z/ Dukes MA-Nantucket MA-Washington RI-Newport RI-Block Island RI- 803 PM EDT Thu Aug 5 2021 ...HIGH RIP CURRENT RISK IN EFFECT FROM 8 AM EDT FRIDAY THROUGH FRIDAY EVENING... ...HIGH SURF ADVISORY HAS EXPIRED... * WHAT...Dangerous rip currents expected. * WHERE...In Massachusetts, Dukes MA and Nantucket MA Counties. In Rhode Island, Washington RI, Newport RI and Block Island RI Counties. * WHEN...From 8 AM EDT Friday through Friday 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. && $$ MAZ020-060115- /O.EXP.KBOX.SU.Y.0001.000000T0000Z-210806T0000Z/ Southern Bristol MA- 803 PM EDT Thu Aug 5 2021 ...HIGH SURF ADVISORY HAS EXPIRED... High surf conditions have lessened so the advisory has been allowed to expire. $$
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 12:12 AM EDT | Special Weather Statement | BOX | Bristol, Newport | 48 min |
| Aug 5, 5:27 AM EDT | Areal Flood Warning | BOX | Bristol, Kent, Newport, Providence, Washington | 7 hr |
| Aug 5, 6:52 AM EDT | Areal Flood Warning | BOX | Providence | 6 hr |
Nearby
High Surf Advisories in Massachusetts, 2021High Surf Advisories in Rhode Island, 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.