Alert archive / Massachusetts / Coastal Flood Advisories in 2021
Coastal Flood Advisory 6, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this coastal flood advisory at Apr 28, 2021, 2:50 PM EDT for 5 counties in Massachusetts. It took effect at Apr 28, 2021, 11:00 PM EDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Apr 28, 2021, 2:50 PM EDT (18:50 UTC)
- In effect from
- Apr 28, 2021, 11:00 PM EDT
- Expired
- Apr 29, 2021, 3:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Boston/Norton, MA
Counties Barnstable County, MA, Essex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 35 km from the middle of the area, began a volume at 18:55 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
Albany, NY (KALY), launched 12:00Z, 6.8 hours before the alert went out and 253 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
- 1596 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 291 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this coastal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boston/Norton, MA wrote its last area forecast discussion before this coastal flood advisory went out at Apr 28, 1:48 PM EDT, 1 hour 2 minutes earlier.
Area forecast discussion, Apr 28, 1:48 PM EDT, 1 hour 2 minutes before
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</html>The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 1:22 AM EDT | Special Weather Statement | BOX | Franklin, Hampden, Hampshire, Worcester | 38 min |
| Apr 28, 4:16 AM EDT | Coastal Flood Statement | BOX | Barnstable, Bristol, Dukes, Essex, Nantucket, Norfolk and 2 more | 23 hr |
| Apr 28, 2:19 AM EDT | Special Weather Statement | BOX | Bristol, Kent, Providence | 41 min |
Nearby
Coastal Flood Advisories in Massachusetts, 2021Every coastal flood 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.