Alert archive / Massachusetts / Flash Flood Warnings in 2007

Flash Flood Warning 6, NWS Boston/Norton, MA

August 3, 2007Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 3, 2007, 8:26 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 counties it named.

The facts

Issued
Aug 3, 2007, 8:26 PM EDT (00:26 UTC)
Expired
Aug 3, 2007, 10:30 PM EDT
In force
2 hr
Issued by
NWS Boston/Norton, MA
Area
Whole counties

County Worcester County, MA

The radar

The Boston radar (KBOX), 77 km from the middle of the area, began a volume at 00:29 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 00:00Z, 0.4 hours before the alert went out and 162 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-pSkew-T log-p diagram, Albany, NY at 00:00Z on 2007-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2899 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2007-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2899 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1104 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.9

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KBOX 040027
FFWBOX
MAC027-040230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
826 PM EDT FRI AUG 3 2007

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...WORCESTER...LEOMINSTER...

* UNTIL 1030 PM EDT

* AT 825 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STERLING...
  PRINCETON...PETERSHAM...LANCASTER...HUBBARDSTON...CLINTON AND BARRE

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS 
ARE SUBJECT TO FLOODING.

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.

LAT...LON 4236 7223 4250 7225 4255 7171 4242 7162
      4218 7164 4216 7218
TIME...MOT...LOC 0026Z 180DEG 0KT 4239 7193

$$

NMB
1 follow-up statement
000 
WGUS71 KBOX 040108
FFSBOX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
906 PM EDT FRI AUG 3 2007

MAC027-040230-
WORCESTER MA-
906 PM EDT FRI AUG 3 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT FOR
CENTRAL WORCESTER COUNTY...

AT 906 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING OVER THE WARNED AREA.

RADAR INDICATED THAT THUNDERSTORMS WITH HEAVY DOWNPOURS WERE 
CROSSING THROUGH THE GREATER WORCESTER AREA.  IN ADDITION...A 
THUNDERSTORM WAS CROSSING OVER PETERSHAM...AND THIS STORM IS 
EXPECTED TO TRACK INTO GARDNER AND WESTMINSTER BY 930 PM. RAINFALL 
RATES IN EXCESS OF 3 INCHES PER HOUR ARE POSSIBLE WITH THESE STORMS. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STERLING...
PRINCETON...PETERSHAM...LEOMINSTER...LANCASTER...HUBBARDSTON...
CLINTON AND BARRE

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.

LAT...LON 4236 7223 4250 7225 4255 7171 4242 7162
      4218 7164 4216 7218
TIME...MOT...LOC 0102Z 180DEG 0KT 4239 7193

$$

NMB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 8:47 PM EDTSevere Thunderstorm WarningBOXFranklin58 min
Aug 3, 8:49 PM EDTSevere Thunderstorm WarningBOXHampshire56 min
Aug 3, 9:24 PM EDTSevere Thunderstorm WarningBOXWorcester66 min
Aug 3, 10:28 PM EDTSevere Thunderstorm WarningBOXWorcester40 min
Aug 4, 5:15 AM EDTSpecial Marine WarningBOX90 min
Aug 4, 6:51 AM EDTSpecial Marine WarningBOX54 min
Aug 4, 4:03 PM EDTSpecial Marine WarningBOX42 min

Nearby

Flash Flood Warnings in Massachusetts, 2007Every flash flood warning in 2007

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.