Alert archive / Massachusetts / Flash Flood Warnings in 2018
Flash Flood Warning 33, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Sep 18, 2018, 3:05 PM EDT for Barnstable County, Massachusetts. It was in force for 115 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
- Sep 18, 2018, 3:05 PM EDT (19:05 UTC)
- Expired
- Sep 18, 2018, 5:00 PM EDT
- In force
- 115 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
County Barnstable County, MA
The radar
The Boston radar (KBOX), 81 km from the middle of the area, began a volume at 19:09 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
Chatham, MA (KCHH), launched 12:00Z, 7.1 hours before the alert went out and 24 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
- 165 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 648 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
440
WGUS51 KBOX 181905
FFWBOX
MAC001-182100-
/O.NEW.KBOX.FF.W.0033.180918T1905Z-180918T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
305 PM EDT TUE SEP 18 2018
The National Weather Service in Boston/Norton has issued a
* Flash Flood Warning for...
Barnstable County in southeastern Massachusetts...
* Until 500 PM EDT.
* At 305 PM EDT Doppler radar indicated thunderstorms with heavy
rainfall moving into the the warned area. Urban and poor
drainage flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Plymouth, Barnstable, Falmouth, Brewster, Provincetown, Yarmouth,
Sandwich, Bourne, Dennis, Mashpee, Harwich, Chatham, Orleans,
Eastham, Wellfleet, Truro, Gosnold and Hyannis.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Flooding will occur quickly and could become life threatening for
those who try to drive through flooded roads or underpasses. Find
alternate routes and avoid flooded areas.
&&
LAT...LON 4153 7000 4165 6999 4166 7004 4151 7069
4165 7067 4179 7058 4181 7054 4173 7027
4180 7003 4188 7001 4191 7005 4188 7005
4200 7009 4204 7015 4202 7021 4209 7021
4210 7019 4206 7007 4198 6998 4164 6993
$$
NMB1 follow-up statement
996
WGUS71 KBOX 182058
FFSBOX
Flash Flood Statement
National Weather Service Boston/Norton MA
458 PM EDT TUE SEP 18 2018
MAC001-182103-
/O.EXP.KBOX.FF.W.0033.000000T0000Z-180918T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Barnstable MA-
458 PM EDT TUE SEP 18 2018
...THE FLASH FLOOD WARNING FOR BARNSTABLE COUNTY WILL EXPIRE AT 500
PM EDT...
Light to moderate rain will continue to fall over Cape Cod thru 6
pm. However the heavy rain associated with thunderstorms has moved
offshore. Minor poor drainage flooding may linger in some locales
during early this evening, but the more widespread flood threat has
come to an end. Therefore the Flash Flood Warning for Cape Cod has
been allowed to expire.
LAT...LON 4153 7000 4165 6999 4166 7004 4151 7069
4165 7067 4179 7058 4181 7054 4173 7027
4180 7003 4188 7001 4191 7005 4188 7005
4200 7009 4204 7015 4202 7021 4209 7021
4210 7019 4206 7007 4198 6998 4164 6993
$$
NMBThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 7:54 AM EDT | Special Weather Statement | BOX | Franklin, Hampshire | 81 min |
| Sep 18, 8:21 AM EDT | Special Weather Statement | BOX | Norfolk | 54 min |
| Sep 18, 8:52 AM EDT | Flash Flood Warning | BOX | Franklin, Hampshire, Middlesex, Worcester | 4 hr |
| Sep 18, 9:09 AM EDT | Special Weather Statement | BOX | Hampden, Worcester | 36 min |
| Sep 18, 9:32 AM EDT | Special Weather Statement | BOX | Essex, Middlesex | 88 min |
| Sep 18, 9:50 AM EDT | Special Weather Statement | BOX | Hampden, Worcester | 85 min |
| Sep 18, 10:12 AM EDT | Special Weather Statement | BOX | Essex | 48 min |
| Sep 18, 10:17 AM EDT | Flash Flood Warning | BOX | Essex, Middlesex, Norfolk, Suffolk, Worcester | 4 hr |
| Sep 18, 10:34 AM EDT | Special Weather Statement | BOX | Essex | 41 min |
| Sep 18, 10:45 AM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 30 min |
| Sep 18, 10:56 AM EDT | Special Marine Warning | BOX | 64 min | |
| Sep 18, 10:58 AM EDT | Flash Flood Warning | BOX | Hampden, Hampshire, Worcester | 4 hr |
| Sep 18, 11:00 AM EDT | Tornado Warning | BOX | Essex | 15 min |
| Sep 18, 11:07 AM EDT | River Flood Warning | BOX | Worcester | 9 hr |
| Sep 18, 11:09 AM EDT | Special Marine Warning | BOX | 66 min | |
| Sep 18, 11:23 AM EDT | Flash Flood Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 4 hr |
| Sep 18, 11:58 AM EDT | Special Marine Warning | BOX | 62 min | |
| Sep 18, 12:20 PM EDT | Special Marine Warning | BOX | 25 min | |
| Sep 18, 12:32 PM EDT | Areal Flood Warning | BOX | Franklin, Hampshire, Middlesex, Worcester | 4 hr |
| Sep 18, 12:49 PM EDT | Special Marine Warning | BOX | 86 min | |
| Sep 18, 12:58 PM EDT | Special Weather Statement | BOX | Plymouth | 62 min |
| Sep 18, 1:10 PM EDT | Special Marine Warning | BOX | 80 min | |
| Sep 18, 1:31 PM EDT | Flash Flood Warning | BOX | Bristol, Plymouth | 4 hr |
| Sep 18, 2:01 PM EDT | Areal Flood Warning | BOX | Essex, Middlesex, Norfolk, Suffolk, Worcester | 4 hr |
| Sep 18, 2:07 PM EDT | Special Weather Statement | BOX | Bristol, Plymouth | 38 min |
| Sep 18, 2:27 PM EDT | Severe Thunderstorm Warning | BOX | Barnstable, Plymouth | 33 min |
| Sep 18, 2:31 PM EDT | Special Marine Warning | BOX | 44 min | |
| Sep 18, 2:59 PM EDT | Special Marine Warning | BOX | 46 min | |
| Sep 18, 3:04 PM EDT | Severe Thunderstorm Warning | BOX | Barnstable | 41 min |
| Sep 18, 3:14 PM EDT | Areal Flood Warning | BOX | Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester | 3 hr |
| Sep 18, 3:22 PM EDT | Special Marine Warning | BOX | 53 min | |
| Sep 18, 3:59 PM EDT | Special Marine Warning | BOX | 46 min | |
| Sep 18, 4:01 PM EDT | Small Craft Advisory | BOX | 60 hr |
Nearby
Flash Flood Warnings in Massachusetts, 2018Every flash flood warning 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.