Alert archive / Vermont / Mesoscale Discussions in 2012

Mesoscale Discussion 1555

July 23, 2012Coos County, New Hampshire; Essex County, Orleans County, Vermont

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2012, 6:43 PM EDT for Coos County, New Hampshire; Essex County, Orleans County, Vermont. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jul 23, 2012, 6:43 PM EDT (22:43 UTC)
Expired
Jul 23, 2012, 8:15 PM EDT
In force
92 min
Issued by
the Storm Prediction Center

Counties Coos County, NH, Essex County, VT, Orleans County, VT

The watches that followed

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

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 10.7 hours before the alert went out and 188 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 2012-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 392 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
392 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
1253 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
50 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 23, 7:16 PM EDTSevere Thunderstorm WatchSPCBelknap, Carroll, Coos, Grafton7 hr
Jul 23, 12:32 PM EDTMesoscale DiscussionSPCAddison, Bennington, Chittenden, Franklin, Grand Isle, Lamoille and 5 more88 min
Jul 23, 1:24 PM EDTSevere Thunderstorm WatchSPCAddison, Bennington, Caledonia, Chittenden, Essex, Franklin and 8 more10 hr
Jul 23, 4:01 PM EDTMesoscale DiscussionSPCAddison, Bennington, Caledonia, Chittenden, Essex, Franklin and 8 more119 min

Nearby

Mesoscale Discussions in Vermont, 2012Mesoscale Discussions in New Hampshire, 2012Every mesoscale discussion in 2012

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.