Alert archive / Massachusetts / Flash Flood Warnings in 2017
Flash Flood Warning 10, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this flash flood warning at Jul 12, 2017, 5:42 PM EDT for Middlesex County, Massachusetts. It was in force for 2 hr. 6 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, 5:42 PM EDT (21:42 UTC)
- Expired
- Jul 12, 2017, 7:45 PM EDT
- In force
- 2 hr
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Flood severity
- None
County Middlesex County, MA
The radar
The Boston radar (KBOX), 66 km from the middle of the area, began a volume at 21:44 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, 6:03 PM EDT | FLOOD | Chelmsford, MA | IMPASSABLE DUE TO FLOODING ON BILLERICA ROAD TO TURNPIKE ROAD |
| Jul 12, 6:59 PM EDT | FLOOD | Groton, MA | 6 INCHES OF STANDING WATER BETWEEN ROUTE 40 AND MAIN STREET |
| Jul 12, 7:04 PM EDT | FLOOD | Lexington, MA | CARS DISABLED DUE TO FLOODING ON WALTHAM STREET AT ROUTE 2 |
| Jul 12, 7:05 PM EDT | FLOOD | Concord, MA | HAWTHORNE LANE FLOODED |
| Jul 12, 7:10 PM EDT | FLOOD | 1 Sw Idylwide, MA | ROUTE 128 CLOSED DUE TO FLOODING AT ROUTE 2 |
| Jul 12, 7:45 PM EDT | FLOOD | Countryside, MA | ROAD FLOODED AT 239 LOWELL STREET. IMPASSABLE. |
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, 9.7 hours before the alert went out and 146 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.
581
WGUS51 KBOX 122142
FFWBOX
MAC017-122345-
/O.NEW.KBOX.FF.W.0010.170712T2142Z-170712T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Taunton MA
542 PM EDT WED JUL 12 2017
The National Weather Service in Taunton has issued a
* Flash Flood Warning for...
Central Middlesex County in northeastern Massachusetts...
* Until 745 PM EDT
* At 541 PM EDT, Doppler radar indicated thunderstorms repeatedly
developing and moving across the warned area. As a result, flash
flooding is expected to begin shortly. Significant urban and poor
drainge flooding is expected. In addition, some area streams may
approach or exceed bankfull levels.
* Some locations that will experience flooding include...
Lowell, Waltham, Malden, Medford, Arlington, Everett, Billerica,
Woburn, Chelmsford, Andover, Lexington, Tewksbury, Melrose, Saugus,
Wakefield, Reading, Burlington, Wilmington, Westford and Acton.
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 4263 7118 4260 7117 4261 7116 4260 7113
4261 7106 4257 7103 4257 7106 4253 7107
4251 7104 4247 7105 4242 7103 4240 7159
4241 7156 4246 7154 4248 7156 4253 7153
4254 7154 4255 7162 4253 7165 4265 7167
$$
NMB1 follow-up statement
023
WGUS71 KBOX 122249
FFSBOX
Flash Flood Statement
National Weather Service Taunton MA
649 PM EDT WED JUL 12 2017
MAC017-122345-
/O.CON.KBOX.FF.W.0010.000000T0000Z-170712T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex MA-
649 PM EDT WED JUL 12 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR
CENTRAL MIDDLESEX COUNTY...
At 647 PM EDT, Doppler radar indicated thunderstorms continuing to
produce heavy rainfall across the warned area. In Bedford, nearly
2.5 inches of rain fell inside of 40 minutes. Flash flooding is
expected, especially in urban and poor drainage areas.
Some locations that will experience flooding include...
Lowell, Waltham, Malden, Medford, Arlington, Everett, Billerica,
Woburn, Chelmsford, Andover, Lexington, Tewksbury, Melrose, Saugus,
Wakefield, Reading, Burlington, Wilmington, Westford and Acton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Flash Flood Warning means that flooding will occur quickly, and
could be life threatening for those who try to drive through flooded
roads or underpasses. Find alternate routes. Those near small streams
need to get to higher ground immediately.
&&
LAT...LON 4263 7118 4260 7117 4261 7116 4260 7113
4261 7106 4257 7103 4257 7106 4253 7107
4251 7104 4247 7105 4242 7103 4240 7159
4241 7156 4246 7154 4248 7156 4253 7153
4254 7154 4255 7162 4253 7165 4265 7167
$$
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, 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, 6:29 PM EDT | Flash Flood Warning | BOX | Middlesex, Norfolk, Suffolk | 2 hr |
| 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.