Alert archive / Massachusetts / Flash Flood Warnings in 2013

Flash Flood Warning 50, NWS Boston/Norton, MA

September 1, 2013Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Sep 1, 2013, 1:45 PM EDT for Worcester County, Massachusetts. It was in force for 2 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: Sep 1, 2013, 1:45 PM EDT (17:45 UTC)
Expired: Sep 1, 2013, 3:45 PM EDT
In force: 2 hr
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Flood severity: None

County Worcester County, MA

The radar

The Boston radar (KBOX), 80 km from the middle of the area, began a volume at 17:49 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, 5.8 hours before the alert went out and 156 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 0 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 83 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.

912 
WGUS51 KBOX 011745
FFWBOX
MAC027-011945-
/O.NEW.KBOX.FF.W.0050.130901T1745Z-130901T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
145 PM EDT SUN SEP 1 2013

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...

* UNTIL 345 PM EDT

* AT 144 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA WITH ESTIMATED ONE-HOUR RAINFALL 
  AMOUNTS UP TO TWO AND A HALF INCHES. WITH THE EXPECTATION OF AN 
  ADDITIONAL INCH OF RAIN IN A SHORT AMOUNT OF TIME...FLASH FLOODING 
  IS EXPECTED TO BEGIN SHORTLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN VEHICLES. TURN AROUND...DONT DROWN.

A FLASH FLOOD WARNING IS ISSUED FOR RAPID AND POTENTIALLY LIFE
THREATENING FLOODING. IN URBAN AREAS AVOID FLOODED ROADS AND OBEY
ROAD CLOSURES. THOSE NEAR SMALL STREAMS MUST HEAD FOR HIGHER GROUND
IMMEDIATELY.

&&

LAT...LON 4223 7209 4229 7182 4214 7193 4212 7213
      4216 7213 4216 7215

$$

SIPPRELL

1 follow-up statement

420 
WGUS71 KBOX 011846
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
246 PM EDT SUN SEP 1 2013

MAC027-011855-
/O.CAN.KBOX.FF.W.0050.000000T0000Z-130901T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WORCESTER MA-
246 PM EDT SUN SEP 1 2013

...THE FLASH FLOOD WARNING FOR CENTRAL WORCESTER COUNTY IS
CANCELLED...

THE HEAVY RAIN HAS ENDED...AND LOCAL LAW ENFORCEMENT HAVE REPORTED 
NO FLOODING IMPACTS. FLOODING IS NO LONGER EXPECTED TO POSE A THREAT.

LAT...LON 4223 7209 4229 7182 4214 7193 4212 7213
      4216 7213 4216 7215

$$

SIPPRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 9:00 PM EDT	Special Weather Statement	BOX	Worcester	45 min
Aug 31, 11:25 PM EDT	Special Weather Statement	BOX	Middlesex	35 min
Sep 1, 1:27 AM EDT	Areal Flood Advisory	BOX	Hampden	2 hr
Sep 1, 2:57 AM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire, Worcester	63 min
Sep 1, 4:06 AM EDT	Special Marine Warning	BOX		24 min
Sep 1, 4:17 AM EDT	Special Weather Statement	BOX	Bristol	43 min
Sep 1, 5:30 AM EDT	Special Marine Warning	BOX		30 min
Sep 1, 5:30 AM EDT	Special Weather Statement	BOX	Barnstable	30 min
Sep 1, 8:35 AM EDT	Special Weather Statement	BOX	Suffolk	40 min
Sep 1, 8:44 AM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	61 min
Sep 1, 8:57 AM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk, Suffolk	5 hr
Sep 1, 9:19 AM EDT	Special Weather Statement	BOX	Norfolk	41 min
Sep 1, 10:03 AM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth	117 min
Sep 1, 12:48 PM EDT	Areal Flood Advisory	BOX	Middlesex, Suffolk	117 min
Sep 1, 1:11 PM EDT	Areal Flood Advisory	BOX	Hampden, Worcester	97 min
Sep 1, 1:41 PM EDT	Areal Flood Advisory	BOX	Worcester	2 hr
Sep 1, 1:57 PM EDT	Areal Flood Warning	BOX	Middlesex, Norfolk, Suffolk	3 hr
Sep 1, 2:36 PM EDT	Flash Flood Warning	BOX	Hampshire	3 hr

Nearby

Flash Flood Warnings in Massachusetts, 2013 Every flash flood warning in 2013

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.