Alert archive / Massachusetts / Flash Flood Warnings in 2014

Flash Flood Warning 33, NWS Boston/Norton, MA

August 1, 2014Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 1, 2014, 6:40 PM EDT for Middlesex County, Massachusetts. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2014, 6:40 PM EDT (22:40 UTC)
Expired: Aug 1, 2014, 8:45 PM EDT
In force: 2 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Middlesex County, MA

The radar

The Boston radar (KBOX), 53 km from the middle of the area, began a volume at 22:43 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

Chatham, MA (KCHH), launched 12:00Z, 10.7 hours before the alert went out and 138 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: 1 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 63 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.

051 
WGUS51 KBOX 012240
FFWBOX
MAC017-020045-
/O.NEW.KBOX.FF.W.0033.140801T2240Z-140802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
640 PM EDT FRI AUG 1 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS...

* UNTIL 845 PM EDT

* AT 639 PM EDT...DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS 
  PRODUCING HEAVY RAIN NEAR SUDBURY AND LINCOLN. RAINFALL OF UP TO 3 
  INCHES IN A SHORT TIME WILL CAUSE ADDITIONAL RAPID FLOODING OF 
  STREETS...UNDERPASSES AND OTHER LOW LYING AREAS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WALTHAM...LEXINGTON...BELMONT...CONCORD...SUDBURY...WAYLAND...
  WESTON AND LINCOLN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RAPID AND POTENTIALLY LIFE THREATENING FLOODING OF STREETS AND
UNDERPASSES IS IMMINENT. DO NOT DRIVE THROUGH FLOODED ROADS AND FIND
ALTERNATE ROUTES.

&&

LAT...LON 4247 7122 4239 7120 4235 7142 4242 7144

$$

JWD

2 follow-up statements

862 
WGUS71 KBOX 012309
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
709 PM EDT FRI AUG 1 2014

MAC017-020045-
/O.CON.KBOX.FF.W.0033.000000T0000Z-140802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX MA-
709 PM EDT FRI AUG 1 2014

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR
CENTRAL MIDDLESEX COUNTY...

AT 707 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
HEAVY RAIN NEAR CONCORD...LINCOLN AND LEXINGTON. RAINFALL RATES AS 
HIGH AS 3 INCHES PER HOUR WILL CAUSE RAPID FLOODING OF STREETS...
UNDERPASSES AND OTHER LOW LYING AREAS.

RAIN SHOULD BEGIN TO DIMINISH AFTER 8 PM...BUT MANY LOCATIONS WILL 
PICK UP ANOTHER INCH OR TWO OF RAIN IN A SHORT TIME.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

RAPID AND POTENTIALLY LIFE THREATENING FLOODING OF STREETS AND
UNDERPASSES IS IMMINENT. DO NOT DRIVE THROUGH FLOODED ROADS AND FIND
ALTERNATE ROUTES.

&&

LAT...LON 4240 7120 4237 7137 4243 7139 4247 7122

$$

JWD

429 
WGUS71 KBOX 020000
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
800 PM EDT FRI AUG 1 2014

MAC017-020010-
/O.CAN.KBOX.FF.W.0033.000000T0000Z-140802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MIDDLESEX MA-
800 PM EDT FRI AUG 1 2014

...THE FLASH FLOOD WARNING FOR CENTRAL MIDDLESEX COUNTY IS
CANCELLED...

FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A
THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD
CLOSURES.

LAT...LON 4240 7120 4237 7137 4243 7139 4247 7122

$$

AED

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 12:57 PM EDT	Special Weather Statement	BOX	Hampshire	48 min
Aug 1, 1:30 PM EDT	Special Weather Statement	BOX	Hampshire	45 min
Aug 1, 2:24 PM EDT	Areal Flood Advisory	BOX	Franklin, Worcester	2 hr
Aug 1, 3:46 PM EDT	Special Weather Statement	BOX	Middlesex	44 min
Aug 1, 3:55 PM EDT	Areal Flood Advisory	BOX	Middlesex	2 hr
Aug 1, 4:25 PM EDT	Flash Flood Warning	BOX	Middlesex, Worcester	2 hr
Aug 1, 4:29 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	29 min
Aug 1, 4:55 PM EDT	Special Weather Statement	BOX	Essex	65 min
Aug 1, 5:00 PM EDT	Special Marine Warning	BOX		2 hr
Aug 1, 5:08 PM EDT	Special Weather Statement	BOX	Hampden	52 min
Aug 1, 5:26 PM EDT	Special Weather Statement	BOX	Essex	64 min
Aug 1, 5:37 PM EDT	Areal Flood Advisory	BOX	Essex	53 min
Aug 1, 5:50 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	55 min
Aug 1, 5:51 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	54 min
Aug 1, 6:02 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	3 hr
Aug 1, 6:26 PM EDT	Special Weather Statement	BOX	Hampden	49 min

Nearby

Flash Flood Warnings in Massachusetts, 2014 Every flash flood warning in 2014

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.