Alert archive / Massachusetts / Flash Flood Warnings in 2009

Flash Flood Warning 9, NWS Boston/Norton, MA

June 30, 2009Franklin County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jun 30, 2009, 7:52 PM EDT for Franklin County, Massachusetts. It was in force for 83 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: Jun 30, 2009, 7:52 PM EDT (23:52 UTC)
Expired: Jun 30, 2009, 9:15 PM EDT
In force: 83 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Franklin County, MA

The radar

The Albany radar (KENX), 129 km from the middle of the area, began a volume at 23:52 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, 11.9 hours before the alert went out and 110 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: 191 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1100 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 92 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.

000 
WGUS51 KBOX 302352
FFWBOX
MAC011-010115-
/O.NEW.KBOX.FF.W.0009.090630T2352Z-090701T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
752 PM EDT TUE JUN 30 2009

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

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

* UNTIL 915 PM EDT

* AT 747 PM EDT...RADAR INDICATED A BAND OF THUNDERSTORMS PRODUCING 
VERY HEAVY RAIN INTO THE GREENFIELD AND SURROUNDING AREAS...TRACKING 
TO THE NORTHEAST AT 15 MPH. THIS BAND IS EXPECTED TO PRODUCE 
RAINFALL OF 2 TO 4 INCHES IN AN HOUR. THIS WILL BE SUFFICIENT TO 
PRODUCE FLASH FLOODING. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY...INCLUDING UNDERPASSES. THE WATER MAY BE TOO DEEP TO ALLOW
VEHICLES TO CROSS SAFELY...OR THE ROADWAY MAY BE UNDERMINED.

LAT...LON 4273 7247 4272 7246 4272 7232 4250 7232
      4247 7262 4274 7275

$$

NMB

2 follow-up statements

000 
WGUS71 KBOX 010028
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
828 PM EDT TUE JUN 30 2009

MAC011-010115-
/O.CON.KBOX.FF.W.0009.000000T0000Z-090701T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRANKLIN MA-
828 PM EDT TUE JUN 30 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR
CENTRAL FRANKLIN COUNTY...

AT 827 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SMALL BAND OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN 
OVER THE WARNED AREA. THIS BAND HAS SLOWED DOWN SUBSTANTIALLY... 
MOVING TO THE EAST AT ONLY 5 MPH AS IT TRACKS THROUGH THE 
MONTAGUE...GILL...AND NORTHFIELD AREAS. RAINFALL OF 2 TO 4 INCHES IN 
AN HOUR IS EXPECTED AS THE BAND TRACKS VERY SLOWLY TO THE EAST.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WARWICK...
NORTHFIELD...LEYDEN...GILL...COLRAIN AND BERNARDSTON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4273 7247 4272 7246 4272 7232 4250 7232
      4247 7262 4274 7275

$$

NMB

000 
WGUS71 KBOX 010123
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
923 PM EDT TUE JUN 30 2009

MAC011-010127-
/O.EXP.KBOX.FF.W.0009.000000T0000Z-090701T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRANKLIN MA-
923 PM EDT TUE JUN 30 2009

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL FRANKLIN COUNTY...

LAT...LON 4273 7247 4272 7246 4272 7232 4250 7232
      4247 7262 4274 7275

THE BAND OF THUNDERSTORMS THAT LINGERED IN THE WARNING AREA IS NOW 
TRACKING EAST INTO WARWICK...ORANGE AND NEW SALEM.  EARLIER THIS 
EVENING FLOODING OCCURRED ALONG DAVIS STREET IN GREENFIELD.  
OTHERWISE...NO SIGNIFICANT FLOODING HAS BEEN REPORTED IN THE AREA.

A SECOND BAND OF THUNDERSTORMS TRACKING RAPIDLY TO THE NORTHEAST 
COULD PRODUCE AN ADDITIONAL QUARTER TO HALF INCH OF RAIN IN THE AREA 
DURING THE NEXT HOUR.  THIS WILL PRODUCE SOME MINOR POOR DRAINAGE 
FLOODING IN SOME AREAS. HOWEVER...FLASH FLOODING IS NOT 
ANTICIPATED.  THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

$$

NMB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 7:13 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire	3 hr
Jun 30, 7:24 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	36 min
Jun 30, 7:38 PM EDT	Areal Flood Advisory	BOX	Franklin, Worcester	3 hr

Nearby

Flash Flood Warnings in Massachusetts, 2009 Every flash flood warning in 2009

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.