Alert archive / Massachusetts / Flash Flood Warnings in 2017
Flash Flood Warning 11, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Jul 12, 2017, 6:29 PM EDT for Middlesex County, Norfolk County, Suffolk County, Massachusetts. It was in force for 2 hr. 17 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 12, 2017, 6:29 PM EDT (22:29 UTC)
- Expired
- Jul 12, 2017, 8:30 PM EDT
- In force
- 2 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Middlesex County, MA, Norfolk County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 47 km from the middle of the area, began a volume at 22:33 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 6:52 PM EDT | FLOOD | Waltham, MA | CARS STUCK IN FLOOD WATERS |
| Jul 12, 6:53 PM EDT | FLOOD | Bemis, MA | FLOODING ON ACTON STREET WITH MANHOLE COVERS BEING LIFTED. |
| Jul 12, 7:03 PM EDT | FLOOD | Waltham, MA | STREET FLOODING ON SUTTON AVE |
| Jul 12, 7:04 PM EDT | FLOOD | Lexington, MA | CARS DISABLED DUE TO FLOODING ON WALTHAM STREET AT ROUTE 2 |
| Jul 12, 7:04 PM EDT | FLOOD | Newton, MA | TREE AND WIRES DOWN ON FORDHAM ROAD |
| Jul 12, 7:04 PM EDT | FLOOD | Waltham, MA | SECOND AVE IMPASSABLE DUE TO FLOODING |
| Jul 12, 7:10 PM EDT | FLOOD | 1 Sw Idylwide, MA | ROUTE 128 CLOSED DUE TO FLOODING AT ROUTE 2 |
| Jul 12, 7:10 PM EDT | FLOOD | Watertown, MA | MANHOLE COVER POPPED OFF DUE TO FLOODING ON ACTON ROAD |
| Jul 12, 7:20 PM EDT | FLOOD | East Arlington, MA | SEVERAL INCHES OF STANDING WATER AND MULTIPLE CARS STRANDED |
| Jul 12, 7:32 PM EDT | FLOOD | Watertown, MA | CAR STUCK DUE TO FLOODING AT WASHINGTON AND WARREN ROAD |
| Jul 12, 7:45 PM EDT | FLOOD | Countryside, MA | ROAD FLOODED AT 239 LOWELL STREET. IMPASSABLE. |
| Jul 12, 7:47 PM EDT | FLOOD | 1 Ssw East Somerville, MA | MEDFORD STREET AT TARGET... FLOODED AND IMPASSABLE AT THE UNDERPASS BENEATH THE RAILROAD TRACKS. |
| Jul 12, 7:47 PM EDT | FLOOD | West Somerville, MA | ALONG GORHAM STREET... FLOODED AND IMPASSABLE. |
| Jul 12, 7:51 PM EDT | FLOOD | West Somerville, MA | SIMPSON AVENUE... FLOODED AND IMPASSABLE. |
| Jul 12, 8:09 PM EDT | FLOOD | East Somerville, MA | BENEATH THE ROUTE 28 OVERPASS ON WASHINGTON STREET... FLOODED AND IMPASSABLE. |
| Jul 12, 8:15 PM EDT | FLOOD | West Somerville, MA | AT HOLLAND AND WALLACE STREETS... CAR STUCK IN FLOOD WATERS. |
| Jul 12, 8:19 PM EDT | FLOOD | North Cambridge, MA | HALF A FOOT OF WATER ON ELMWOOD STREET |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Chatham, MA (KCHH), launched 12:00Z, 10.5 hours before the alert went out and 132 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
- 358 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1158 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted.
788
WGUS51 KBOX 122229
FFWBOX
MAC017-021-025-130030-
/O.NEW.KBOX.FF.W.0011.170712T2229Z-170713T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Taunton MA
629 PM EDT WED JUL 12 2017
The National Weather Service in Taunton has issued a
* Flash Flood Warning for...
North central Norfolk County in eastern Massachusetts...
Suffolk County in eastern Massachusetts...
East central Middlesex County in northeastern Massachusetts...
* Until 830 PM EDT
* At 629 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is expected to
begin shortly.
* Some locations that will experience flooding include...
Boston, Cambridge, Newton, Somerville, Waltham, Brookline, Medford,
Arlington, Everett, Woburn, Natick, Watertown, Lexington, Needham,
Wellesley, Belmont, Dedham, Burlington, Winchester and Concord.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flash Flood Warning means that flooding will occur quickly, and
could be life threatening for those who try to drive through flooded
roads or underpasses. Find alternate routes. Those near small streams
need to get to higher ground immediately.
&&
LAT...LON 4242 7141 4251 7119 4234 7101 4222 7118
4232 7138
$$
NMB1 follow-up statement
296
WGUS71 KBOX 122252
FFSBOX
Flash Flood Statement
National Weather Service Taunton MA
652 PM EDT WED JUL 12 2017
MAC017-021-025-130030-
/O.CON.KBOX.FF.W.0011.000000T0000Z-170713T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Norfolk MA-Suffolk MA-Middlesex MA-
652 PM EDT WED JUL 12 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM EDT FOR
NORTH CENTRAL NORFOLK...SUFFOLK AND EAST CENTRAL MIDDLESEX
COUNTIES...
At 650 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. As the thunderstorms passed thru
Bedford, nearly 2.5 inches of rain fell within 40 minutes. Flash
flooding is expected, especially in urban and poor drainage areas.
Some locations that will experience flooding include...
Boston, Cambridge, Newton, Somerville, Waltham, Brookline, Medford,
Arlington, Everett, Woburn, Natick, Watertown, Lexington, Needham,
Wellesley, Belmont, Dedham, Burlington, Winchester and Concord.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Flooding will occur quickly and could become life threatening for
those who try to drive through flooded roads or underpasses. Find
alternate routes and avoid flooded areas.
A Flash Flood Warning means that flooding will occur quickly, and
could be life threatening for those who try to drive through flooded
roads or underpasses. Find alternate routes. Those near small streams
need to get to higher ground immediately.
&&
LAT...LON 4242 7141 4251 7119 4234 7101 4222 7118
4232 7138
$$
NMBThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 10:15 AM EDT | Flash Flood Watch | BOX | Bristol, Essex, Hampden, Middlesex, Norfolk, Plymouth and 2 more | 11 hr |
| Jul 12, 11:01 AM EDT | Special Weather Statement | BOX | Suffolk | 29 min |
| Jul 12, 12:01 PM EDT | Special Weather Statement | BOX | Franklin | 44 min |
| Jul 12, 12:05 PM EDT | Special Weather Statement | BOX | Worcester | 40 min |
| Jul 12, 12:24 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Worcester | 51 min |
| Jul 12, 12:25 PM EDT | Areal Flood Advisory | BOX | Franklin | 65 min |
| Jul 12, 12:36 PM EDT | Special Weather Statement | BOX | Hampden | 39 min |
| Jul 12, 12:44 PM EDT | Areal Flood Advisory | BOX | Middlesex, Norfolk, Worcester | 61 min |
| Jul 12, 12:46 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk | 44 min |
| Jul 12, 12:50 PM EDT | Special Weather Statement | BOX | Middlesex | 40 min |
| Jul 12, 12:53 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 67 min |
| Jul 12, 1:19 PM EDT | Areal Flood Advisory | BOX | Hampden | 56 min |
| Jul 12, 1:22 PM EDT | Severe Thunderstorm Warning | BOX | Hampden | 38 min |
| Jul 12, 1:39 PM EDT | Special Weather Statement | BOX | Worcester | 51 min |
| Jul 12, 1:39 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk, Plymouth | 51 min |
| Jul 12, 1:41 PM EDT | Special Weather Statement | BOX | Middlesex | 49 min |
| Jul 12, 1:47 PM EDT | Special Weather Statement | BOX | Hampden | 43 min |
| Jul 12, 1:52 PM EDT | Areal Flood Advisory | BOX | Bristol, Norfolk, Plymouth | 53 min |
| Jul 12, 2:35 PM EDT | Areal Flood Advisory | BOX | Bristol, Plymouth | 55 min |
| Jul 12, 2:53 PM EDT | Flash Flood Warning | BOX | Bristol, Norfolk | 112 min |
| Jul 12, 3:04 PM EDT | Areal Flood Advisory | BOX | Middlesex, Norfolk, Worcester | 56 min |
| Jul 12, 3:10 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 50 min |
| Jul 12, 3:26 PM EDT | Flash Flood Warning | BOX | Bristol | 2 hr |
| Jul 12, 3:36 PM EDT | Special Weather Statement | BOX | Hampshire | 39 min |
| Jul 12, 3:44 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 35 min |
| Jul 12, 3:53 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Plymouth | 34 min |
| Jul 12, 4:01 PM EDT | Special Weather Statement | BOX | Hampden | 44 min |
| Jul 12, 4:06 PM EDT | Areal Flood Advisory | BOX | Bristol, Plymouth | 114 min |
| Jul 12, 4:16 PM EDT | Special Weather Statement | BOX | Plymouth | 44 min |
| Jul 12, 4:18 PM EDT | Areal Flood Advisory | BOX | Norfolk, Plymouth, Suffolk | 57 min |
| Jul 12, 4:24 PM EDT | Special Marine Warning | BOX | 66 min | |
| Jul 12, 4:32 PM EDT | Special Marine Warning | BOX | 58 min | |
| Jul 12, 4:36 PM EDT | Areal Flood Advisory | BOX | Franklin, Hampden, Hampshire | 114 min |
| Jul 12, 4:39 PM EDT | Special Marine Warning | BOX | 66 min | |
| Jul 12, 4:48 PM EDT | Special Weather Statement | BOX | Middlesex | 42 min |
| Jul 12, 4:53 PM EDT | Flash Flood Warning | BOX | Hampden, Hampshire | 112 min |
| Jul 12, 5:00 PM EDT | Areal Flood Advisory | BOX | Essex, Middlesex | 60 min |
| Jul 12, 5:19 PM EDT | Areal Flood Advisory | BOX | Hampden, Worcester | 56 min |
| Jul 12, 5:21 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 35 min |
| Jul 12, 5:36 PM EDT | Flash Flood Warning | BOX | Worcester | 114 min |
| Jul 12, 5:36 PM EDT | Special Weather Statement | BOX | Middlesex | 39 min |
| Jul 12, 5:42 PM EDT | Flash Flood Warning | BOX | Middlesex | 2 hr |
| Jul 12, 6:10 PM EDT | Special Weather Statement | BOX | Middlesex | 35 min |
| Jul 12, 6:20 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Norfolk, Suffolk | 25 min |
| Jul 12, 6:39 PM EDT | Special Weather Statement | BOX | Norfolk | 36 min |
| Jul 12, 7:05 PM EDT | Special Weather Statement | BOX | Suffolk | 25 min |
| Jul 12, 7:35 PM EDT | Areal Flood Warning | BOX | Middlesex | 115 min |
Nearby
Flash Flood Warnings in Massachusetts, 2017Every flash flood warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.