Alert archive / Massachusetts / Flash Flood Warnings in 2011

Flash Flood Warning 8, NWS Boston/Norton, MA

August 19, 2011Franklin County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 19, 2011, 2:36 PM EDT for Franklin 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: Aug 19, 2011, 2:36 PM EDT (18:36 UTC)
Expired: Aug 19, 2011, 6:30 PM EDT
In force: 4 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Franklin County, MA

The radar

The Albany radar (KENX), 102 km from the middle of the area, began a volume at 18:36 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, 6.6 hours before the alert went out and 83 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: 205 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 940 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 42 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.

773 
WGUS51 KBOX 191836
FFWBOX
MAC011-192030-
/O.NEW.KBOX.FF.W.0008.110819T1836Z-110819T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
236 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...

* UNTIL 430 PM EDT

* AT 235 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 4274 7293 4273 7256 4252 7256 4249 7272
      4253 7288 4254 7289 4254 7291 4256 7297

$$

SIPPRELL

3 follow-up statements

629 
WGUS51 KBOX 192027
FFWBOX
MAC011-192230-
/O.EXT.KBOX.FF.W.0008.000000T0000Z-110819T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
427 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...

* UNTIL 630 PM EDT

* AT 421 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM RECENT THUNDERSTORMS OVER THE WARNED AREA.     
  STRONG TO SEVERE THUNDERSTORMS PRODUCING HEAVY RAINFALL ARE        
  PRESENTLY OCCURRING OVER NORTHERN BERKSHIRE COUNTY IN              
  MASSACHUSETTS AND ARE LIKELY TO MIGRATE EASTWARD INTO WESTERN F    
  FRANKLIN COUNTY INCREASING TOTAL RAINFALL TOTALS PRESENTLY         
  ESTIMATED BETWEEN 3.0 AND 3.5 INCHES. 

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 4274 7293 4273 7256 4252 7256 4249 7272
      4253 7288 4254 7289 4254 7291 4256 7297

$$

SIPPRELL

256 
WGUS51 KBOX 192031 CCA
FFWBOX
MAC011-192230-
/O.COR.KBOX.FF.W.0008.000000T0000Z-110819T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE TAUNTON MA
427 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...

* UNTIL 630 PM EDT

* AT 421 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM RECENT THUNDERSTORMS OVER THE WARNED AREA.     
  STRONG TO SEVERE THUNDERSTORMS PRODUCING HEAVY RAINFALL ARE        
  PRESENTLY OCCURRING OVER NORTHERN BERKSHIRE COUNTY IN              
  MASSACHUSETTS. THESE STORMS ARE LIKELY TO MIGRATE EASTWARD         
  INTO WESTERN FRANKLIN COUNTY INCREASING RAINFALL TOTALS            
  PRESENTLY ESTIMATED BY RADAR BETWEEN 3.0 AND 3.5 INCHES. 

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 4274 7293 4273 7256 4252 7256 4249 7272
      4253 7288 4254 7289 4254 7291 4256 7297

$$

SIPPRELL

704 
WGUS71 KBOX 192229
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
629 PM EDT FRI AUG 19 2011

MAC011-192236-
/O.EXP.KBOX.FF.W.0008.000000T0000Z-110819T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRANKLIN MA-
629 PM EDT FRI AUG 19 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 630 PM EDT FOR NORTHWESTERN
FRANKLIN COUNTY...

LIGHT TO MODERATE RAIN WILL CONTINUE OVER THE NEXT HOUR...BUT THE 
HEAVIEST RAINS HAVE DIMINISHED ACROSS THE AREA. BASINS ACROSS THE 
PREVIOUSLY WARNED AREA HAVE BEGUN TO RECEDE.

LAT...LON 4274 7293 4273 7256 4252 7256 4249 7272
      4253 7288 4254 7289 4254 7291 4256 7297

$$

SIPPRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 12:51 PM EDT	Areal Flood Advisory	BOX	Franklin	3 hr
Aug 19, 1:56 PM EDT	Special Weather Statement	BOX	Franklin	34 min
Aug 19, 2:02 PM EDT	Special Weather Statement	BOX	Worcester	43 min
Aug 19, 2:14 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	46 min
Aug 19, 2:27 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	35 min
Aug 19, 2:33 PM EDT	Special Weather Statement	BOX	Worcester	42 min
Aug 19, 2:41 PM EDT	Special Weather Statement	BOX	Norfolk	34 min
Aug 19, 2:57 PM EDT	Special Weather Statement	BOX	Franklin	48 min
Aug 19, 2:57 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	25 min
Aug 19, 3:06 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Suffolk	54 min
Aug 19, 3:07 PM EDT	Special Weather Statement	BOX	Worcester	53 min
Aug 19, 3:14 PM EDT	Areal Flood Advisory	BOX	Worcester	75 min
Aug 19, 3:15 PM EDT	Special Marine Warning	BOX		45 min
Aug 19, 3:18 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	27 min
Aug 19, 3:18 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	27 min
Aug 19, 3:22 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	33 min
Aug 19, 3:29 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	36 min
Aug 19, 3:36 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Suffolk	72 min
Aug 19, 3:39 PM EDT	Special Weather Statement	BOX	Essex	66 min
Aug 19, 3:47 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	43 min
Aug 19, 3:53 PM EDT	Special Marine Warning	BOX		67 min
Aug 19, 3:57 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	23 min
Aug 19, 4:02 PM EDT	Areal Flood Advisory	BOX	Middlesex, Worcester	29 min
Aug 19, 4:22 PM EDT	Special Marine Warning	BOX		53 min
Aug 19, 4:36 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	39 min
Aug 19, 4:57 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	63 min
Aug 19, 5:02 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire	3 hr
Aug 19, 5:07 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	38 min
Aug 19, 5:34 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	26 min
Aug 19, 6:43 PM EDT	Special Weather Statement	BOX	Hampshire	62 min
Aug 19, 7:25 PM EDT	Special Weather Statement	BOX	Hampden	50 min
Aug 19, 7:30 PM EDT	Areal Flood Advisory	BOX	Hampden	64 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.