Flash Flood Warning 29, NWS Boston/Norton, MA

Issued

Sep 1, 2021, 10:01 PM EDT (02:01 UTC)

Expired

Sep 2, 2021, 6:00 AM EDT

In force

8 hr

Issued by

NWS Boston/Norton, MA

Area

Storm-based polygon

Flood severity

None

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

The Boston radar (KBOX), 37 km from the middle of the area, began a volume at 02:03 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.

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

704 
WGUS51 KBOX 020201
FFWBOX
MAC009-017-021-025-021000-
/O.NEW.KBOX.FF.W.0029.210902T0201Z-210902T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
1001 PM EDT Wed Sep 1 2021

The National Weather Service in Norton has issued a

* Flash Flood Warning for...
  Northern Norfolk County in eastern Massachusetts...
  Suffolk County in eastern Massachusetts...
  Southeastern Essex County in northeastern Massachusetts...
  Southeastern Middlesex County in northeastern Massachusetts...

* Until 600 AM EDT Thursday.

* At 1001 PM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 0.5 and 1.5 inches of rain have fallen. 
  Additional rainfall amounts of 2 to 4 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Boston, Cambridge, Quincy, Lynn, Newton, Somerville, Framingham, 
  Waltham, Malden, Brookline, Medford, Weymouth, Revere, Peabody, 
  Arlington, Everett, Salem, Billerica, Beverly and Marlborough.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 4232 7156 4241 7158 4279 7051 4228 7071
      4226 7081 4231 7092 4230 7092 4227 7086
      4226 7087 4226 7086 4226 7083 4224 7086
      4227 7088 4225 7087 4211 7150 4217 7148
      4219 7154 4227 7155 4226 7151 4233 7149

FLASH FLOOD...RADAR INDICATED

$$

Frank

553 
WGUS71 KBOX 020828
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
428 AM EDT Thu Sep 2 2021

MAC009-017-021-025-021000-
/O.CON.KBOX.FF.W.0029.000000T0000Z-210902T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Essex MA-Middlesex MA-Norfolk MA-Suffolk MA-
428 AM EDT Thu Sep 2 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 AM EDT EARLY THIS 
MORNING FOR NORTHERN NORFOLK, SUFFOLK, SOUTHEASTERN ESSEX AND 
SOUTHEASTERN MIDDLESEX COUNTIES...

At 428 AM EDT, Doppler radar indicated heavy rain across the warned 
area. Between 2 and 4 inches of rain have fallen. Additional 
rainfall amounts of 1 to 1.5 inches are possible in the warned area. 
Flash flooding is already occurring.

HAZARD...Flash flooding caused by heavy rain.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Boston, Cambridge, Quincy, Lynn, Newton, Somerville, Framingham, 
  Waltham, Malden, Brookline, Medford, Weymouth, Revere, Peabody, 
  Arlington, Everett, Salem, Billerica, Beverly and Marlborough.

There are reports of significant urban flooding across the Boston 
Metropolitan area early this morning. While the heavy rain should 
exit the region by 7 am, the morning commute may be quite difficult 
with some roads flooded and impassable.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4232 7156 4241 7158 4279 7051 4228 7071
      4226 7081 4231 7092 4230 7092 4227 7086
      4226 7087 4226 7086 4226 7083 4224 7086
      4227 7088 4225 7087 4211 7150 4217 7148
      4219 7154 4227 7155 4226 7151 4233 7149

FLASH FLOOD...RADAR INDICATED

$$

Frank

Flash Flood Warnings in Massachusetts, 2021Every flash flood warning in 2021

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.