Alert archive / Massachusetts / Flash Flood Warnings in 2022

Flash Flood Warning 7, NWS Boston/Norton, MA

September 5, 2022Essex County, Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Sep 5, 2022, 5:10 AM EDT for Essex County, Middlesex County, Massachusetts. It was in force for 2 hr. 1 report 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 5, 2022, 5:10 AM EDT (09:10 UTC)
Expired: Sep 5, 2022, 7:31 AM EDT
In force: 2 hr
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), 58 km from the middle of the area, began a volume at 09:14 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 5, 5:12 AM EDT	FLOOD	Woburn, MA	OLYMPIA AVENUE AT WHEELING AVENUE FLOODED AND IMPASSABLE. PARKING LOT NEAR THE INTERSECTION ALSO FLOODED AND CLOSED OFF PER LAW ENFORCEMENT. REPORTED BY AMATEUR RADIO.

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 00:00Z, 9.2 hours before the alert went out and 173 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: 970 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

750 
WGUS51 KBOX 050910
FFWBOX
MAC009-017-051215-
/O.NEW.KBOX.FF.W.0007.220905T0910Z-220905T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
510 AM EDT Mon Sep 5 2022

The National Weather Service in Norton has issued a

* Flash Flood Warning for...
  Southwestern Essex County in northeastern Massachusetts...
  East Central Middlesex County in northeastern Massachusetts...

* Until 815 AM EDT.

* At 510 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  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...
  Cambridge, Lynn, Newton, Somerville, Waltham, Malden, Medford, 
  Revere, Peabody, Arlington, Everett, Billerica, Woburn, Andover, 
  Watertown, Lexington, Tewksbury, North Andover, Melrose and Saugus.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4261 7118 4264 7108 4257 7104 4249 7099
      4245 7102 4245 7103 4244 7102 4241 7105
      4233 7126 4233 7127 4233 7128 4252 7142

FLASH FLOOD...RADAR INDICATED

$$

FN

1 follow-up statement

174 
WGUS71 KBOX 051131
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
731 AM EDT Mon Sep 5 2022

MAC009-017-051141-
/O.CAN.KBOX.FF.W.0007.000000T0000Z-220905T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Essex MA-Middlesex MA-
731 AM EDT Mon Sep 5 2022

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN ESSEX AND EAST 
CENTRAL MIDDLESEX COUNTIES...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flood Watch remains in effect until 500 PM EDT Tuesday for 
portions of northern Connecticut, Massachusetts and Rhode Island.

LAT...LON 4261 7118 4264 7108 4257 7104 4249 7099
      4245 7102 4245 7103 4244 7102 4241 7105
      4233 7126 4233 7127 4233 7128 4252 7142

$$

FN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 2:45 AM EDT	Special Weather Statement	BOX	Essex, Middlesex	60 min
Sep 5, 3:08 AM EDT	Flood Watch	BOX	Bristol, Essex, Hampden, Middlesex, Norfolk, Plymouth and 2 more	34 hr
Sep 5, 3:20 AM EDT	Flash Flood Warning	BOX	Essex, Middlesex	3 hr
Sep 5, 4:52 AM EDT	Special Weather Statement	BOX	Essex, Middlesex	53 min
Sep 5, 9:20 AM EDT	Special Weather Statement	BOX	Worcester	55 min
Sep 5, 10:45 AM EDT	Flash Flood Warning	BOX	Worcester	111 min
Sep 5, 1:38 PM EDT	Areal Flood Warning	BOX	Bristol	82 min
Sep 5, 2:39 PM EDT	Flash Flood Warning	BOX	Bristol	5 hr

Nearby

Flash Flood Warnings in Massachusetts, 2022 Every flash flood warning in 2022

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.