Alert archive / Massachusetts / Flash Flood Warnings in 2017

Flash Flood Warning 27, NWS Boston/Norton, MA

September 30, 2017Essex County, Suffolk County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Sep 30, 2017, 6:07 AM EDT for Essex County, Suffolk County, Massachusetts. It was in force for 113 min. 12 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: Sep 30, 2017, 6:07 AM EDT (10:07 UTC)
Expired: Sep 30, 2017, 8:00 AM EDT
In force: 113 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Essex County, MA, Suffolk County, MA

The radar

The Boston radar (KBOX), 59 km from the middle of the area, began a volume at 10:09 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.

What was reported inside it

Time	Report	Where	Remark
Sep 30, 6:15 AM EDT	FLOOD	Salem, MA	POPE STREET CLOSED DUE TO FLOODING
Sep 30, 6:24 AM EDT	FLOOD	Lynn, MA	MULTIPLE ROADS FLOODED
Sep 30, 6:31 AM EDT	FLOOD	Lynn, MA	BOSTON STREET AT STETSON STREET FLOODED AND IMPASSABLE
Sep 30, 6:32 AM EDT	FLOOD	Lynn, MA	CAR STUCK IN FLOOD WATERS ON BOSTON STREET AT BRIDGE STREET
Sep 30, 6:36 AM EDT	FLOOD	Lynn, MA	CAR STUCK IN FLOOD WATER IN LYNN COMMONS WITH PEOPLE RESCUED
Sep 30, 6:42 AM EDT	FLOOD	Lynn, MA	BOSTON STREET AT COTTAGE STREET MULTIPLE CARS STUCK NI FLOOD WATERS AND ROAD CLOSED
Sep 30, 6:43 AM EDT	FLOOD	Lynn, MA	CARS STUCK IN FLOOD WATERS ON BOTH WASHINGTON STREET AND JOHNSON STREET
Sep 30, 6:50 AM EDT	FLOOD	Lynn, MA	WESTERN AVENUE AND LIBERTY STREET CLOSED DUE TO FLOODING...NORTH COMMON STREET FLOODED AND IMPASSABLE
Sep 30, 6:55 AM EDT	FLOOD	Lynn, MA	ALLEY STREET FLOODED AND IMPASABLE
Sep 30, 6:58 AM EDT	FLOOD	Lynn, MA	CAR STUCK IN FLOODING ON COMMERCIAL STREET AT FENNICK STREET
Sep 30, 7:05 AM EDT	FLOOD	Lynn, MA	WYMAN STREET FLOODED WITH 6 TO 12 INCHES OF WATER
Sep 30, 7:49 AM EDT	FLOOD	Lynn, MA	CARS STUCK IN FLOOD WATERS ON MONROE...NEWPARK STREETS AND WESTERN AVENUE WITH FEDERAL STREET FLOODED AND 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 00:00Z, 10.1 hours before the alert went out and 117 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 999 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

269 
WGUS51 KBOX 301007
FFWBOX
MAC009-025-301200-
/O.NEW.KBOX.FF.W.0027.170930T1007Z-170930T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Taunton MA
607 AM EDT SAT SEP 30 2017

The National Weather Service in Taunton has issued a

* Flash Flood Warning for...
  Northeastern Suffolk County in eastern Massachusetts...
  South central Essex County in northeastern Massachusetts...

* Until 800 AM EDT

* At 606 AM EDT, Doppler radar indicated heavy rain across the warned
  area. Up to two inches of rain have already fallen. Flash flooding
  is expected to begin shortly.

* Some locations that will experience flooding include...
  Lynn, Revere, Peabody, Salem, Beverly, Saugus, Marblehead,
  Swampscott and Nahant.

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 4249 7082 4245 7088 4244 7091 4243 7091
      4242 7093 4242 7096 4241 7097 4248 7104
      4255 7089

$$

Frank

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 4:06 AM EDT	Small Craft Advisory	BOX		21 hr
Sep 30, 5:37 AM EDT	Special Weather Statement	BOX	Essex	38 min
Sep 30, 6:04 AM EDT	Areal Flood Warning	BOX	Essex, Suffolk	116 min
Sep 30, 6:24 AM EDT	Special Weather Statement	BOX	Suffolk	51 min
Sep 30, 6:28 AM EDT	Severe Thunderstorm Warning	BOX	Essex, Suffolk	47 min
Sep 30, 6:32 AM EDT	Special Marine Warning	BOX		43 min
Sep 30, 8:00 AM EDT	Areal Flood Advisory	BOX	Middlesex, Suffolk	2 hr
Sep 30, 9:00 AM EDT	Areal Flood Advisory	BOX	Norfolk, Plymouth, Suffolk	2 hr
Sep 30, 9:24 AM EDT	Special Weather Statement	BOX	Suffolk	66 min

Nearby

Flash Flood Warnings in Massachusetts, 2017 Every 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.