Alert archive / Massachusetts / Flash Flood Warnings in 2018

Flash Flood Warning 14, NWS Boston/Norton, MA

August 3, 2018Franklin County, Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 3, 2018, 5:59 PM EDT for Franklin County, Hampshire County, Worcester County, Massachusetts. It was in force for 71 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: Aug 3, 2018, 5:59 PM EDT (21:59 UTC)
Expired: Aug 3, 2018, 7:10 PM EDT
In force: 71 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Franklin County, MA, Hampshire County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 129 km from the middle of the area, began a volume at 22:02 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 12:00Z, 10.0 hours before the alert went out and 115 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: 98 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 716 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

610 
WGUS51 KBOX 032159
FFWBOX
MAC011-015-027-040000-
/O.NEW.KBOX.FF.W.0014.180803T2159Z-180804T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boston/Norton MA
559 PM EDT FRI AUG 3 2018

The National Weather Service in Boston/Norton has issued a

* Flash Flood Warning for...
  Northwestern Worcester County in central Massachusetts...
  Northeastern Hampshire County in western Massachusetts...
  Northeastern Franklin County in western Massachusetts...

* Until 800 PM EDT.

* At 559 PM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two inches of rain have 
  been estimated by radar to have fallen over the warned area. Flash 
  flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Amherst, Orange, Deerfield, Montague, Hadley, Sunderland, Hatfield,
  Northfield, Leverett, Erving, Shutesbury, Gill, Whately, Royalston,
  Wendell and Warwick.

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 7240 4272 7223 4243 7244 4238 7266
      4273 7241

$$

Sipprell

1 follow-up statement

204 
WGUS71 KBOX 032310
FFSBOX

Flash Flood Statement
National Weather Service Boston/Norton MA
710 PM EDT FRI AUG 3 2018

MAC011-015-027-032319-
/O.CAN.KBOX.FF.W.0014.000000T0000Z-180804T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Worcester MA-Hampshire MA-Franklin MA-
710 PM EDT FRI AUG 3 2018

...THE FLASH FLOOD WARNING FOR NORTHWESTERN WORCESTER...NORTHEASTERN
HAMPSHIRE AND NORTHEASTERN FRANKLIN COUNTIES IS CANCELLED...

The heavy rain has ended. Flood waters have receded. Please continue 
to heed any remaining road closures.

LAT...LON 4272 7240 4272 7223 4243 7244 4238 7266
      4273 7241

$$

Frank

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 3:30 AM EDT	Heat Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	15 hr
Aug 3, 12:56 PM EDT	Special Weather Statement	BOX	Worcester	34 min
Aug 3, 1:02 PM EDT	Special Weather Statement	BOX	Worcester	28 min
Aug 3, 1:07 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	23 min
Aug 3, 1:11 PM EDT	Special Weather Statement	BOX	Norfolk	34 min
Aug 3, 1:43 PM EDT	Areal Flood Advisory	BOX	Suffolk	62 min
Aug 3, 1:47 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	43 min
Aug 3, 1:53 PM EDT	Special Marine Warning	BOX		42 min
Aug 3, 2:41 PM EDT	Flash Flood Watch	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 3 more	25 hr
Aug 3, 2:58 PM EDT	Special Weather Statement	BOX	Franklin	47 min
Aug 3, 3:05 PM EDT	Special Marine Warning	BOX		25 min
Aug 3, 3:35 PM EDT	Small Craft Advisory	BOX		32 hr
Aug 3, 3:59 PM EDT	Special Weather Statement	BOX	Franklin	46 min
Aug 3, 5:08 PM EDT	Flash Flood Warning	BOX	Franklin, Hampden, Hampshire	112 min
Aug 3, 5:14 PM EDT	Special Weather Statement	BOX	Franklin	31 min
Aug 3, 5:16 PM EDT	Special Weather Statement	BOX	Franklin	29 min
Aug 3, 5:19 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	27 min
Aug 3, 5:20 PM EDT	Tornado Warning	BOX	Franklin, Worcester	25 min
Aug 3, 5:34 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	13 min
Aug 3, 5:50 PM EDT	Special Weather Statement	BOX	Hampden, Hampshire	55 min
Aug 3, 6:03 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	27 min
Aug 3, 6:04 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	41 min
Aug 3, 6:27 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	48 min
Aug 3, 7:08 PM EDT	Areal Flood Advisory	BOX	Worcester	21 min

Nearby

Flash Flood Warnings in Massachusetts, 2018 Every flash flood warning in 2018

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.