Alert archive / Massachusetts / Areal Flood Warnings in 2017

Areal Flood Warning 21, NWS Boston/Norton, MA

September 15, 2017Essex County, Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this areal flood warning at Sep 15, 2017, 5:34 PM EDT for Essex County, Middlesex County, Massachusetts. It was in force for 116 min. 2 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 15, 2017, 5:34 PM EDT (21:34 UTC)
Expired: Sep 15, 2017, 7:30 PM EDT
In force: 116 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Essex County, MA, Middlesex County, MA

The radar

The Boston radar (KBOX), 84 km from the middle of the area, began a volume at 21:35 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 15, 5:55 PM EDT	FLOOD	Lawrence, MA	CHICKERING ROAD AT ROUTE 114 FLOODED OUT. CAR STUCK IN FLOOD WATERS ON HALSEY STREET
Sep 15, 6:24 PM EDT	FLOOD	Lawrence, MA	GRAFTON STREET FLOODED AND IMPASSABLE. CAR DISABLED IN STREET FLOODING AT CULTER AVENUE AND CHICKERING ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 9.6 hours before the alert went out and 150 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: 354 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 467 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

106 
WGUS41 KBOX 152134
FLWBOX

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Taunton MA
534 PM EDT FRI SEP 15 2017

MAC009-017-152330-
/O.NEW.KBOX.FA.W.0021.170915T2134Z-170915T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Essex MA-Middlesex MA-
534 PM EDT FRI SEP 15 2017

The National Weather Service in Taunton has issued a

* Flood Warning for...
  West central Essex County in northeastern Massachusetts...
  Northeastern Middlesex County in northeastern Massachusetts...

* Until 730 PM EDT

* At 534 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain which will cause flooding. Up to one inch of rain has
  already fallen.

* Some locations that will experience flooding include...
  Lowell, Lawrence, Haverhill, Methuen, Andover, Dracut, Tewksbury,
  North Andover, Salem, Ipswich, Georgetown, Boxford, Groveland,
  Topsfield, Rowley and Pelham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Warning means that flooding is imminent or occurring. Do not
drive through roads or underpasses that are flooded. 
Avoid flooded
areas near small streams and move to higher ground immediately.
&&

LAT...LON 4273 7098 4266 7093 4262 7132 4270 7132
      4270 7129 4273 7127 4274 7124 4275 7122
      4274 7119 4275 7118

$$

Frank

1 follow-up statement

829 
WGUS81 KBOX 152250
FLSBOX

FLOOD STATEMENT
NATIONAL WEATHER SERVICE Taunton MA
650 PM EDT FRI SEP 15 2017

MAC009-017-152300-
/O.CAN.KBOX.FA.W.0021.000000T0000Z-170915T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Essex MA-Middlesex MA-
650 PM EDT FRI SEP 15 2017

...THE FLOOD WARNING HAS BEEN CANCELLED FOR west central Essex and
northeastern Middlesex Counties...

THE HEAVY RAIN HAS ENDED...AND ADDITIONAL FLOODING IS NO LONGER 
EXPECTED TO POSE A THREAT.

LAT...LON 4273 7098 4266 7093 4262 7132 4270 7132
      4270 7129 4273 7127 4274 7124 4275 7122
      4274 7119 4275 7118

$$

Frank

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 9:58 AM EDT	Special Marine Warning	BOX		62 min
Sep 15, 12:05 PM EDT	Special Marine Warning	BOX		85 min
Sep 15, 1:28 PM EDT	Special Marine Warning	BOX		62 min
Sep 15, 3:38 PM EDT	Special Weather Statement	BOX	Essex	22 min
Sep 15, 4:00 PM EDT	Special Weather Statement	BOX	Middlesex	30 min
Sep 15, 4:21 PM EDT	Special Weather Statement	BOX	Essex	54 min
Sep 15, 4:58 PM EDT	Special Weather Statement	BOX	Middlesex	32 min
Sep 15, 5:02 PM EDT	Areal Flood Advisory	BOX	Essex	58 min
Sep 15, 5:18 PM EDT	Areal Flood Warning	BOX	Essex	117 min
Sep 15, 6:39 PM EDT	Areal Flood Advisory	BOX	Suffolk	66 min

Nearby

Areal Flood Warnings in Massachusetts, 2017 Every areal 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.