Alert archive / Massachusetts / Mesoscale Discussions in 2016

Mesoscale Discussion 1380

July 23, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2016, 6:36 PM EDT for 4 states. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Jul 23, 2016, 6:36 PM EDT (22:36 UTC)
Expired
Jul 23, 2016, 7:30 PM EDT
In force
54 min
Issued by
the Storm Prediction Center

Counties Berkshire County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, York County, ME, Cheshire County, NH, Hillsborough County, NH, Rockingham County, NH, Strafford County, NH, Windham County, VT

The radar

The Boston radar (KBOX), 98 km from the middle of the area, began a volume at 22:39 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

Gray, ME (KGYX), launched 12:00Z, 10.6 hours before the alert went out and 159 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, Gray, ME at 12:00Z on 2016-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 12:00Z on 2016-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1588 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 23, 11:46 AM EDTMesoscale DiscussionSPCOxford119 min
Jul 23, 3:10 PM EDTSevere Thunderstorm WatchSPCYork4 hr
Jul 23, 4:43 PM EDTMesoscale DiscussionSPCCumberland, York92 min
Jul 23, 6:04 PM EDTSevere Thunderstorm WatchSPCEssex, Franklin, Hampden, Hampshire, Middlesex, Norfolk and 2 more2 hr

Nearby

Mesoscale Discussions in Massachusetts, 2016Mesoscale Discussions in New Hampshire, 2016Mesoscale Discussions in Maine, 2016Every mesoscale discussion in 2016

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.