Alert archive / Vermont / Mesoscale Discussions in 2010

Mesoscale Discussion 721

May 26, 20104 states

The Storm Prediction Center issued this mesoscale discussion at May 26, 2010, 9:47 PM EDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 26, 2010, 9:47 PM EDT (01:47 UTC)
Expired: May 26, 2010, 11:15 PM EDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Berkshire County, MA, Franklin County, MA, Hampshire County, MA, Cheshire County, NH, Sullivan County, NH, Columbia County, NY, Essex County, NY, Rensselaer County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Albany radar (KENX), 85 km from the middle of the area, began a volume at 01:50 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 226May 26, 10:25 PM EDT

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 1.8 hours before the alert went out and 63 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: 2726 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1783 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

088 
ACUS11 KWNS 270148
SWOMCD
SPC MCD 270147
NHZ000-MAZ000-VTZ000-CTZ000-NYZ000-270315-

MESOSCALE DISCUSSION 0721
NWS STORM PREDICTION CENTER NORMAN OK
0847 PM CDT WED MAY 26 2010

AREAS AFFECTED...MID/UPPER HUDSON VALLEY AND WRN NEW ENGLAND

CONCERNING...SEVERE THUNDERSTORM WATCH 225...

VALID 270147Z - 270315Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 225
CONTINUES.

EVOLVING MCS OVER NWRN VT/NERN NY IS EXPECTED TO CONTINUE SWD WITH
SOME ACCELERATION TO 35-40 KT POSSIBLE.  EXTRAPOLATION OF CURRENT
MOTION PLACES SYSTEM AT SRN FRINGE OF WW AREA BETWEEN 0300-0330Z AND
AN ADDITIONAL WW MAY BE NECESSARY.

AS OF 0130Z...REGIONAL RADAR IMAGERY INDICATED THE BULK OF A GROWING
CONVECTIVE CLUSTER OF STORMS/SMALL MCS OVER ADDISON CO VT INTO ESSEX
CO NY.  MOVEMENT OF COMPLEX WAS SWD AT 30-35 KT.  MODIFICATION OF
00Z ALB FOR COOLING SURFACE TEMPERATURES STILL YIELDS MODERATE
INSTABILITY ABOVE A DEVELOPING...SHALLOW STABLE LAYER.  AS
SUCH...EXPECT TSTMS TO CONTINUE SWD...PERHAPS EVEN ACCELERATE...AS
35-40 KT OF DEEP NLY SHEAR AND A GROWING/INTENSIFYING COLD POOL
COMBINE TO MAINTAIN ROBUST UPDRAFT DEVELOPMENT ALONG LEADING EDGE OF
SYSTEM GUST FRONT.  HAIL AND DAMAGING WIND GUSTS REMAIN LIKELY ALONG
MCS TRACK.

..MEAD.. 05/27/2010

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

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

LAT...LON   43327376 44207384 44287343 44077260 43597199 42687212
            42227253 41967292 41847355 42077394 42627394 43327376

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 10:23 PM EDT	Severe Thunderstorm Watch	SPC	Berkshire, Bristol, Franklin, Hampden, Hampshire, Middlesex and 2 more	4 hr
May 27, 12:07 AM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin, Hampden, Hampshire, Middlesex, Worcester	53 min
May 27, 11:28 AM EDT	Mesoscale Discussion	SPC	Broome, Cayuga, Chemung, Chenango, Cortland, Delaware and 10 more	92 min
May 27, 1:23 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Broome, Chemung, Chenango, Cortland, Delaware and 15 more	8 hr
May 27, 4:13 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Cortland, Delaware, Greene and 7 more	62 min

Nearby

Mesoscale Discussions in Vermont, 2010 Mesoscale Discussions in New York, 2010 Mesoscale Discussions in Massachusetts, 2010 Every mesoscale discussion in 2010

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.