Alert archive / Massachusetts / Areal Flood Warnings in 2021
Areal Flood Warning 39, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this areal flood warning at Oct 31, 2021, 3:21 AM EDT for Bristol County, Plymouth County, Massachusetts. It was in force for 96 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Oct 31, 2021, 3:21 AM EDT (07:21 UTC)
- Expired
- Oct 31, 2021, 4:57 AM EDT
- In force
- 96 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bristol County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 37 km from the middle of the area, began a volume at 07:21 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, 7.4 hours before the alert went out and 183 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
- 854 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
814 WGUS41 KBOX 310721 FLWBOX BULLETIN - IMMEDIATE BROADCAST REQUESTED Flood Warning National Weather Service Boston/Norton MA 321 AM EDT Sun Oct 31 2021 MAC005-023-310915- /O.NEW.KBOX.FA.W.0039.211031T0721Z-211031T0915Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Bristol MA-Plymouth MA- 321 AM EDT Sun Oct 31 2021 The National Weather Service in Norton has issued a * Flood Warning for... Southeastern Bristol County in southeastern Massachusetts... Southern Plymouth County in southeastern Massachusetts... * Until 515 AM EDT. * At 321 AM EDT, Doppler radar indicated heavy rain due to thunderstorms. Flooding is ongoing or expected to begin shortly in the warned area. Between 1 and 2 inches of rain have fallen. * Some locations that will experience flooding include... New Bedford, Dartmouth, Fairhaven, Acushnet and Mattapoisett. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 4171 7101 4169 7081 4157 7083 4159 7103 $$ Chai
1 follow-up statement
679 WGUS81 KBOX 310857 FLSBOX Flood Statement National Weather Service Boston/Norton MA 457 AM EDT Sun Oct 31 2021 MAC005-023-310907- /O.CAN.KBOX.FA.W.0039.000000T0000Z-211031T0915Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Bristol MA-Plymouth MA- 457 AM EDT Sun Oct 31 2021 ...FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN BRISTOL AND SOUTHERN PLYMOUTH COUNTIES... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 4171 7101 4169 7081 4157 7083 4159 7103 $$ Chai
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 31, 2:01 AM EDT | Special Marine Warning | BOX | 59 min | |
| Oct 31, 2:13 AM EDT | Special Weather Statement | BOX | Dukes | 47 min |
| Oct 31, 2:26 AM EDT | Severe Thunderstorm Warning | BOX | Barnstable, Dukes, Plymouth | 31 min |
| Oct 31, 3:11 AM EDT | Special Weather Statement | BOX | Plymouth | 64 min |
| Oct 31, 3:34 AM EDT | Special Marine Warning | BOX | 56 min |
Nearby
Areal Flood Warnings in Massachusetts, 2021Every areal flood warning 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.