Alert archive / Massachusetts / Flash Flood Warnings in 2012

Flash Flood Warning 7, NWS Boston/Norton, MA

July 28, 2012Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 28, 2012, 1:35 PM EDT for Hampden County, Hampshire County, Massachusetts. It was in force for 3 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: Jul 28, 2012, 1:35 PM EDT (17:35 UTC)
Expired: Jul 28, 2012, 4:30 PM EDT
In force: 3 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

Counties Hampden County, MA, Hampshire County, MA

The radar

The Boston radar (KBOX), 125 km from the middle of the area, began a volume at 17:34 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
Jul 28, 4:10 PM EDT	FLOOD	Belchertown, MA	ROUTE 202 NEAR GRANBY LINE HAS 6 TO 8 INCHES OF WATER IN ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.6 hours before the alert went out and 111 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: 285 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 590 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

601 
WGUS51 KBOX 281735
FFWBOX
MAC013-015-282030-
/O.NEW.KBOX.FF.W.0007.120728T1735Z-120728T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
135 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
  CENTRAL HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF NORTHAMPTON...

* UNTIL 430 PM EDT

* AT 126 PM EDT...DOPPLER RADAR CONTINUED TO SHOW HEAVY SHOWERS AND
  THUNDERSTORMS MOVING OVER THE SAME AREAS OF HAMPSHIRE AND HAMPDEN
  COUNTIES... ESPECIALLY FROM EASTHAMPTON TO SOUTH HADLEY. 
  1 TO 2 INCHES HAS ALREADY FALLEN AND AN ADDITIONAL 2 INCHES IS
  LIKELY IN THESE AREAS THROUGH MID AFTERNOON. 

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 4237 7272 4236 7238 4223 7233 4223 7271

$$
FIELD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 3:54 AM EDT	Flash Flood Watch	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	24 hr
Jul 28, 11:50 AM EDT	Special Weather Statement	BOX	Hampden	55 min
Jul 28, 12:50 PM EDT	Special Weather Statement	BOX	Worcester	25 min
Jul 28, 12:59 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Worcester	6 hr
Jul 28, 2:28 PM EDT	Areal Flood Advisory	BOX	Hampden, Hampshire, Worcester	3 hr
Jul 28, 3:18 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	3 hr
Jul 28, 3:33 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire, Worcester	3 hr
Jul 28, 3:41 PM EDT	Special Weather Statement	BOX	Worcester	49 min
Jul 28, 4:01 PM EDT	Flash Flood Warning	BOX	Hampden, Worcester	2 hr
Jul 28, 4:13 PM EDT	Special Weather Statement	BOX	Norfolk	62 min
Jul 28, 4:47 PM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more	3 hr
Jul 28, 6:42 PM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	3 hr
Jul 28, 7:25 PM EDT	Areal Flood Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	3 hr
Jul 28, 7:31 PM EDT	Flash Flood Warning	BOX	Bristol	59 min

Nearby

Flash Flood Warnings in Massachusetts, 2012 Every flash flood warning in 2012

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.