Alert archive / Massachusetts / Mesoscale Discussions in 2008

Mesoscale Discussion 2011

August 3, 20086 states

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2008, 10:27 AM EDT for 6 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 3, 2008, 10:27 AM EDT (14:27 UTC)
Expired: Aug 3, 2008, 1:00 PM EDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 45 counties

Barnstable County, MA, Berkshire County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Rensselaer County, NY, Suffolk County, NY, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI, Bennington County, VT, Essex County, VT, Orange County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Boston radar (KBOX), 77 km from the middle of the area, began a volume at 14:30 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, 2.5 hours before the alert went out and 130 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: 1224 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 555 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 031428
SWOMCD
SPC MCD 031427 
MEZ000-MAZ000-NHZ000-RIZ000-VTZ000-CTZ000-NYZ000-031700-

MESOSCALE DISCUSSION 2011
NWS STORM PREDICTION CENTER NORMAN OK
0927 AM CDT SUN AUG 03 2008

AREAS AFFECTED...NEW ENGLAND

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 031427Z - 031700Z

12Z UPR AIR ANALYSIS DEPICTS A LOW ALONG THE VT/UPSTATE NY BORDER
WITH AN ASSOCD POOL OF MINUS 12 TO MINUS 15 DEG C H5 TEMPERATURES
OVER MOST OF NEW ENGLAND.  AT THE SAME TIME...MID-MORNING SFC DEW
POINTS WERE IN THE LWR-MID 60S AND LATEST GOES SOUNDER PWAT VALUES
WERE HOVERING FROM 1.25-1.5 INCH.  RESULTANT THERMODYNAMIC PROFILE
CHARACTERIZED BY MODEST MID-TROPOSPHERIC LAPSE RATES AND SUFFICIENT
MOISTURE WILL SET THE STAGE FOR PULSE-SVR AND LOW-TOPPED MULTICELL
TSTMS THROUGH PEAK HEATING.

12Z RAOB AND CURRENT VSBL SATL LOOPS SUGGEST THE STRONGEST BUOYANCY
WILL LIKELY EXIST IN AN N-S AXIS CENTERED ACROSS CT...RI NWD INTO
PARTS OF NH.  THIS REGION WILL BE SITUATED BENEATH THE COLDEST
MID-LVL COLD POOL AND STRONGEST INSOLATION.  THE VERTICAL SHEAR WILL
REMAIN WEAK IN THE LOWEST 6KM...BUT MODESTLY LOW WBZ LEVELS WILL
FOSTER HAIL PRODUCTION.  GUSTY WINDS CAN ALSO BE EXPECTED.

SVR WEATHER POTENTIAL WILL PROBABLY BE LIMITED IN SPATIAL AND
TEMPORAL SCALES.  HOWEVER...UPCOMING 1630Z SWODY1 WILL INCLUDE AT
LEAST LOW SVR PROBABILITIES.  IF EARLY AFTN TSTMS SEEM TO BE
ORGANIZING MORE THAN EXPECTED...A SEVERE THUNDERSTORM WATCH MAY HAVE
TO BE CONSIDERED.

..RACY.. 08/03/2008

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...GYX...BOX...BTV...OKX...ALY...

43597309 45117138 45417077 45487031 45276984 44786946
44166922 43616900 42987005 42727003 42116956 41816942
41616944 41316949 41146944 40926976 40927005 40947058
40887114 40687192 40777259 40997284 41877344 42637369
42917362

Nearby

Mesoscale Discussions in Massachusetts, 2008 Mesoscale Discussions in New Hampshire, 2008 Mesoscale Discussions in Maine, 2008 Every mesoscale discussion in 2008

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.