Alert archive / Massachusetts / Flash Flood Warnings in 2017

Flash Flood Warning 29, NWS Boston/Norton, MA

October 24, 2017Franklin County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Oct 24, 2017, 9:58 PM EDT for Franklin County, Hampshire County, Massachusetts. It was in force for 4 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: Oct 24, 2017, 9:58 PM EDT (01:58 UTC)
Expired: Oct 25, 2017, 2:00 AM EDT
In force: 4 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Franklin County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 123 km from the middle of the area, began a volume at 01:59 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

Albany, NY (KALY), launched 00:00Z, 2.0 hours before the alert went out and 104 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: 40 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 872 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

261 
WGUS51 KBOX 250158
FFWBOX
MAC011-015-250600-
/O.NEW.KBOX.FF.W.0029.171025T0158Z-171025T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Taunton MA
958 PM EDT TUE OCT 24 2017

The National Weather Service in Taunton has issued a

* Flash Flood Warning for...
  Central Hampshire County in western Massachusetts...
  Franklin County in western Massachusetts...

* Until 200 AM EDT

* At 957 PM EDT, Doppler radar indicated heavy rain across the warned
  area. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Amherst, Greenfield, Deerfield, Montague, Hadley, Sunderland,
  Hatfield, Northfield, Williamsburg, Bernardston, Buckland, Conway,
  Shelburne, Leverett, Erving, Shutesbury, Ashfield, Colrain, Gill
  and Whately.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding will occur quickly, and
could be life threatening for those who try to drive through flooded
roads or underpasses. Find alternate routes. Those near small streams
need to get to higher ground immediately.

&&

LAT...LON 4272 7236 4236 7242 4242 7288 4274 7278

$$

Frank

1 follow-up statement

966 
WGUS71 KBOX 250556
FFSBOX

Flash Flood Statement
National Weather Service Taunton MA
156 AM EDT WED OCT 25 2017

MAC011-015-250606-
/O.EXP.KBOX.FF.W.0029.000000T0000Z-171025T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hampshire MA-Franklin MA-
156 AM EDT WED OCT 25 2017

...THE FLASH FLOOD WARNING FOR CENTRAL HAMPSHIRE AND FRANKLIN
COUNTIES WILL EXPIRE AT 200 AM EDT...

Rainfall rates will continue to taper off this morning.  However 
enough rainfall has warranted a flood advisory to cover the 
remaining minor flood risk. Please continue to heed any remaining 
road closures.

LAT...LON 4272 7236 4236 7242 4242 7288 4274 7278

$$

md

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 24, 8:47 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	3 hr
Oct 24, 9:06 PM EDT	Special Weather Statement	BOX	Franklin	39 min
Oct 24, 9:31 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	4 hr
Oct 24, 9:48 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	42 min
Oct 24, 10:27 PM EDT	Special Weather Statement	BOX	Franklin, Hampden, Hampshire	93 min
Oct 24, 10:54 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Worcester	3 hr
Oct 24, 11:19 PM EDT	Special Weather Statement	BOX	Worcester	56 min
Oct 25, 12:55 AM EDT	Special Weather Statement	BOX	Worcester	35 min
Oct 25, 1:23 AM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	3 hr
Oct 25, 1:52 AM EDT	Special Weather Statement	BOX	Worcester	38 min
Oct 25, 1:55 AM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Worcester	3 hr
Oct 25, 3:19 AM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	116 min
Oct 25, 3:48 AM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Suffolk	117 min
Oct 25, 5:14 AM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Norfolk, Plymouth, Suffolk	2 hr
Oct 25, 5:26 AM EDT	Small Craft Advisory	BOX		70 hr
Oct 25, 7:05 AM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth, Suffolk	115 min
Oct 25, 7:31 AM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk	119 min
Oct 25, 12:16 PM EDT	Areal Flood Advisory	BOX	Barnstable, Dukes, Nantucket, Plymouth	3 hr
Oct 25, 12:58 PM EDT	Areal Flood Warning	BOX	Barnstable, Dukes	6 hr
Oct 25, 1:48 PM EDT	Special Marine Warning	BOX		57 min
Oct 25, 4:00 PM EDT	Gale Watch	BOX		11 hr

Nearby

Flash Flood Warnings in Massachusetts, 2017 Every flash 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.