Alert archive / Massachusetts / Flash Flood Warnings in 2018

Flash Flood Warning 8, NWS Boston/Norton, MA

July 17, 20186 counties in Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 17, 2018, 1:08 PM EDT for 6 counties in Massachusetts. It was in force for 112 min. 11 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 17, 2018, 1:08 PM EDT (17:08 UTC)
Expired: Jul 17, 2018, 3:00 PM EDT
In force: 112 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Essex County, MA, Middlesex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 73 km from the middle of the area, began a volume at 17:11 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 17, 1:44 PM EDT	FLOOD	Lowell, MA	FLOODING ON ROUTE 38 AT PARKVIEW STREET
Jul 17, 1:44 PM EDT	FLASH FLOOD	Lowell, MA	FLOODING ON ROUTE 38 AT PARKVIEW STREET
Jul 17, 2:28 PM EDT	FLOOD	Saugus, MA	STREET FLOODING IN CLIFTONDALE SQUARE
Jul 17, 2:28 PM EDT	FLASH FLOOD	Saugus, MA	STREET FLOODING IN CLIFTONDALE SQUARE
Jul 17, 2:40 PM EDT	FLOOD	Gloucester, MA	SECTION OF ESSEX AVE IS FLOODED
Jul 17, 2:40 PM EDT	FLASH FLOOD	Gloucester, MA	SECTION OF ESSEX AVE IS FLOODED
Jul 17, 2:53 PM EDT	FLOOD	Boston, MA	DEVON STREET AT COLUMBIA ROAD IS FLOODED
Jul 17, 2:53 PM EDT	FLASH FLOOD	Boston, MA	DEVON STREET AT COLUMBIA ROAD IS FLOODED
Jul 17, 2:57 PM EDT	FLOOD	Wellesley, MA	EASTBOUND SIDE OF WALNUT STREET IS FLOODED OUT
Jul 17, 2:57 PM EDT	FLASH FLOOD	Wellesley, MA	EASTBOUND SIDE OF WALNUT STREET IS FLOODED OUT
Jul 17, 3:08 PM EDT	FLOOD	Winthrop, MA	WASHINGTON AVE AT DELBYS CORNER FLOODED OUT

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, 5.1 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 159 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

523 
WGUS51 KBOX 171708
FFWBOX
MAC009-017-021-023-025-027-171900-
/O.NEW.KBOX.FF.W.0008.180717T1708Z-180717T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
108 PM EDT TUE JUL 17 2018

The National Weather Service in Boston/Norton has issued a

* Flash Flood Warning for...
  Southeastern Worcester County in central Massachusetts...
  Central Norfolk County in eastern Massachusetts...
  Suffolk County in eastern Massachusetts...
  Essex County in northeastern Massachusetts...
  Middlesex County in northeastern Massachusetts...
  Northern Plymouth County in southeastern Massachusetts...

* Until 300 PM EDT.

* At 104 PM EDT Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. These storms have produced 2 to 
  3 inches of rainfall per hour. Flash flooding is expected to begin 
  shortly.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

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 4287 7082 4281 7087 4280 7078 4269 7074
      4270 7062 4266 7057 4257 7065 4255 7076
      4244 7091 4241 7090 4242 7096 4235 7094
      4232 7085 4213 7101 4211 7212 4269 7152
      4270 7129 4274 7118 4280 7118 4289 7089

$$

AED

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 16, 8:50 PM EDT	Special Weather Statement	BOX	Franklin	40 min
Jul 16, 8:53 PM EDT	Special Weather Statement	BOX	Franklin	37 min
Jul 16, 9:17 PM EDT	Areal Flood Advisory	BOX	Franklin, Worcester	77 min
Jul 17, 3:58 AM EDT	Heat Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Worcester	12 hr
Jul 17, 4:15 AM EDT	Flash Flood Watch	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 3 more	15 hr
Jul 17, 10:46 AM EDT	Special Weather Statement	BOX	Franklin	44 min
Jul 17, 11:04 AM EDT	Flash Flood Warning	BOX	Franklin, Hampshire	3 hr
Jul 17, 11:28 AM EDT	Special Weather Statement	BOX	Franklin	47 min
Jul 17, 11:36 AM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	54 min
Jul 17, 11:39 AM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	51 min
Jul 17, 11:46 AM EDT	Flash Flood Warning	BOX	Franklin, Hampden, Hampshire	3 hr
Jul 17, 12:23 PM EDT	Special Weather Statement	BOX	Middlesex	37 min
Jul 17, 12:30 PM EDT	Flash Flood Warning	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	2 hr
Jul 17, 12:33 PM EDT	Special Weather Statement	BOX	Worcester	42 min
Jul 17, 12:45 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	45 min
Jul 17, 12:57 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	48 min
Jul 17, 1:15 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	60 min
Jul 17, 1:18 PM EDT	Special Marine Warning	BOX		57 min
Jul 17, 1:33 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	45 min
Jul 17, 1:41 PM EDT	Special Marine Warning	BOX		64 min
Jul 17, 1:59 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	46 min
Jul 17, 2:22 PM EDT	Areal Flood Warning	BOX	Franklin, Hampden, Hampshire, Worcester	3 hr
Jul 17, 3:03 PM EDT	Areal Flood Warning	BOX	Essex, Middlesex, Norfolk, Suffolk, Worcester	3 hr
Jul 17, 3:10 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire, Worcester	2 hr
Jul 17, 3:27 PM EDT	Flash Flood Warning	BOX	Worcester	2 hr
Jul 17, 3:27 PM EDT	Special Weather Statement	BOX	Worcester	48 min
Jul 17, 3:43 PM EDT	Special Weather Statement	BOX	Middlesex	47 min
Jul 17, 4:09 PM EDT	Areal Flood Warning	BOX	Norfolk, Worcester	2 hr
Jul 17, 4:23 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	52 min
Jul 17, 4:32 PM EDT	Special Weather Statement	BOX	Middlesex	58 min
Jul 17, 5:06 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Worcester	39 min
Jul 17, 5:08 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	52 min
Jul 17, 5:20 PM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk, Suffolk	60 min
Jul 17, 5:47 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	43 min
Jul 17, 5:51 PM EDT	Special Marine Warning	BOX		54 min
Jul 17, 5:58 PM EDT	Special Marine Warning	BOX		92 min
Jul 17, 6:35 PM EDT	Special Marine Warning	BOX		40 min
Jul 17, 6:41 PM EDT	Special Marine Warning	BOX		64 min
Jul 17, 6:58 PM EDT	Special Marine Warning	BOX		27 min
Jul 17, 7:12 PM EDT	Special Marine Warning	BOX		48 min
Jul 17, 7:23 PM EDT	Special Marine Warning	BOX		67 min
Jul 17, 7:41 PM EDT	Special Marine Warning	BOX		49 min

Nearby

Flash Flood Warnings in Massachusetts, 2018 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.