Alert archive / Massachusetts / Flash Flood Warnings in 2011

Flash Flood Warning 4, NWS Boston/Norton, MA

July 4, 2011Essex County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 4, 2011, 7:13 PM EDT for Essex County, Massachusetts. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 4, 2011, 7:13 PM EDT (23:13 UTC)
Expired: Jul 4, 2011, 8:12 PM EDT
In force: 59 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Essex County, MA

The radar

The Boston radar (KBOX), 91 km from the middle of the area, began a volume at 23:17 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.

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 11.2 hours before the alert went out and 136 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: 5 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 783 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

142 
WGUS51 KBOX 042313
FFWBOX
MAC009-050115-
/O.NEW.KBOX.FF.W.0004.110704T2313Z-110705T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
713 PM EDT MON JUL 4 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN ESSEX COUNTY IN EASTERN MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...NEWBURYPORT...GLOUCESTER...

* UNTIL 915 PM EDT

* AT 712 PM EDT...^NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

FLASH FLOODING OF SMALL STREAMS AND URBAN AREAS IS OCCURRING OR
IMMINENT. THOSE NEAR STREAMS AND CREEKS...OR IN AREAS PRONE TO
FLOODING SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. AVOID FLOODED
ROADS. THE WATER MAY BE TOO DEEP TO ALLOW VEHICLES TO CROSS SAFELY...
OR THE ROADWAY MAY BE UNDERMINED. TURN AROUND...DONT DROWN!

&&

LAT...LON 4287 7085 4287 7081 4270 7077 4266 7069
      4270 7063 4264 7057 4262 7059 4263 7061
      4257 7065 4259 7068 4257 7070 4279 7113
      4282 7109 4281 7107 4286 7103 4289 7093

$$

DOODY

1 follow-up statement

063 
WGUS71 KBOX 050012
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
812 PM EDT MON JUL 4 2011

MAC009-050023-
/O.CAN.KBOX.FF.W.0004.000000T0000Z-110705T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ESSEX MA-
812 PM EDT MON JUL 4 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN ESSEX
COUNTY...

LAT...LON 4287 7085 4287 7081 4270 7077 4266 7069
      4270 7063 4264 7057 4262 7059 4263 7061
      4257 7065 4259 7068 4257 7070 4279 7113
      4282 7109 4281 7107 4286 7103 4289 7093

$$

DOODY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 8:35 PM EDT	Special Marine Warning	BOX		55 min
Jul 4, 4:59 PM EDT	Special Weather Statement	BOX	Middlesex	61 min
Jul 4, 5:45 PM EDT	Special Weather Statement	BOX	Essex	60 min
Jul 4, 5:53 PM EDT	Special Marine Warning	BOX		67 min
Jul 4, 5:54 PM EDT	Severe Thunderstorm Warning	BOX	Essex	51 min
Jul 4, 6:28 PM EDT	Special Marine Warning	BOX		62 min
Jul 4, 6:40 PM EDT	Areal Flood Advisory	BOX	Essex	92 min
Jul 4, 6:42 PM EDT	Severe Thunderstorm Warning	BOX	Essex	44 min
Jul 4, 6:57 PM EDT	Areal Flood Advisory	BOX	Worcester	53 min
Jul 4, 7:08 PM EDT	Special Weather Statement	BOX	Essex	52 min
Jul 4, 7:45 PM EDT	Special Weather Statement	BOX	Worcester	60 min
Jul 4, 7:46 PM EDT	Special Marine Warning	BOX		31 min

Nearby

Flash Flood Warnings in Massachusetts, 2011 Every flash flood warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.