Alert archive / Massachusetts / Flash Flood Warnings in 2005

Flash Flood Warning 8, NWS Boston/Norton, MA

August 14, 2005Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 14, 2005, 5:33 PM EDT for Plymouth County, Massachusetts. It was in force for 87 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 14, 2005, 5:33 PM EDT (21:33 UTC)
Expired: Aug 14, 2005, 7:00 PM EDT
In force: 87 min
Issued by: NWS Boston/Norton, MA
Area: Counties, with a storm outline in the text

County Plymouth County, MA

The radar

The Boston radar (KBOX), 24 km from the middle of the area, began a volume at 21:36 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

Chatham, MA (KCHH), launched 12:00Z, 9.6 hours before the alert went out and 86 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: 2172 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KBOX 142136
FFWBOX
MAC023-142300-
/0..000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
533 PM EDT SUN AUG 14 2005

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS
  THIS INCLUDES THE CITY OF BROCKTON

* UNTIL 700 PM EDT

* AT 528 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM WEST BRIDGEWATER TO
  DUXBURY...OR ALONG A LINE EXTENDING FROM 6 MILES SOUTH OF BROCKTON
  TO 7 MILES NORTH OF PLYMOUTH...MOVING EAST AT 30 MPH.

* THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL WILL BE NEAR...
  KINGSTON AND HALIFAX BY 550 PM EDT

CONTINUED THUNDERSTORM DEVELOPMENT WILL RESULT IN ADDITIONAL HEAVY 
RAINFALL ACROSS NORTHERN AND CENTRAL PLYMOUTH COUNTY. SOME AREAS IN 
NORTHERN PLYMOUTH COUNTY ALREADY EXPERIENCING FLOODING WILL CONTINUE 
TO DO SO. REMEMBER THAT FLOODING MAY PERSIST ALONG SOME SMALL 
STREAMS AND URBAN DRAINAGES FOR AN HOUR OR SO AFTER THE HEAVY RAIN 
HAS ENDED.

RAINFALL ACROSS SOUTHEAST NORFOLK COUNTY AND NORTHERN PLYMOUTH 
COUNTY HAS EXCEEDED 4 INCHES IN MANY LOCATIONS.  A HINGHAM NATIONAL 
WEATHER SERVICE STORM SPOTTER REPORTED 5.35 INCHES IN JUST THREE 
HOURS.

FLASH FLOODING OF POOR DRAINAGE AREAS IS LIKELY DUE TO THE TORRENTIAL
RAINFALL. CULVERTS ALONG ROADSIDES MAY BE WASHED OUT. STANDING WATER
ON ROADWAYS AND ESPECIALLY UNDERPASSES MAY RISE TO SEVERAL FEET IN
DEPTH SUBMERGING MOST VEHICLES.

LAT...LON 4207 7106 4195 7097 4197 7056 4216 7073

$$

THOMPSON

1 follow-up statement

000 
WGUS71 KBOX 142256
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
651 PM EDT SUN AUG 14 2005

MAC023-142300-
PLYMOUTH MA-
651 PM EDT SUN AUG 14 2005

...A FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE AT 700 PM EDT 
FOR NORTHERN PLYMOUTH COUNTY...

ALTHOUGH THE THUNDERSTORMS THAT PRODUCED THE FLASH FLOODING HAVE 
MOVED OFFSHORE...SMALL STREAMS AND VARIOUS URBAN DRAINAGES MAY STILL 
BE RUNNING HIGH WITH WATER. ALSO...THERE IS STILL A RISK OF 
ADDITIONAL SHOWERS AND THUNDERSTORMS MOVING THROUGH THE AREA LATER 
THIS EVENING. THUS...CONTINUE TO EXERCISE CAUTION AND AVOID DRIVING 
THROUGH ANY FLOODED ROADS.

THOMPSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 2:24 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	51 min
Aug 14, 2:29 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	23 min
Aug 14, 2:35 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	40 min
Aug 14, 2:49 PM EDT	Special Marine Warning	BOX		86 min
Aug 14, 3:14 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth	46 min
Aug 14, 3:22 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	53 min
Aug 14, 3:26 PM EDT	Flash Flood Warning	BOX	Norfolk, Plymouth	2 hr
Aug 14, 4:08 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	37 min
Aug 14, 4:17 PM EDT	Special Marine Warning	BOX		91 min
Aug 14, 4:22 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	53 min
Aug 14, 4:39 PM EDT	Severe Thunderstorm Warning	BOX	Plymouth	51 min
Aug 14, 5:05 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	55 min
Aug 14, 5:15 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	45 min
Aug 14, 5:55 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex	50 min
Aug 14, 6:19 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	26 min
Aug 14, 6:28 PM EDT	Special Marine Warning	BOX		92 min
Aug 14, 6:34 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Suffolk	41 min

Nearby

Flash Flood Warnings in Massachusetts, 2005 Every flash flood warning in 2005

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.