Alert archive / Maine / Mesoscale Discussions in 2011

Mesoscale Discussion 1707

July 23, 2011Aroostook County, Penobscot County, Piscataquis County, Maine

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2011, 2:26 PM EDT for Aroostook County, Penobscot County, Piscataquis County, Maine. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2011, 2:26 PM EDT (18:26 UTC)
Expired: Jul 23, 2011, 3:30 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

Counties Aroostook County, ME, Penobscot County, ME, Piscataquis County, ME

The radar

The Caribou radar (KCBW), 72 km from the middle of the area, began a volume at 18:29 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 watches that followed

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

Severe Thunderstorm Watch 678Jul 23, 3:15 PM EDT

The nearest sounding before it

Caribou, ME (KCAR), launched 12:00Z, 6.4 hours before the alert went out and 79 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: 252 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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.

Issued	Product	Office	Counties	Lasted
Jul 23, 3:18 PM EDT	Severe Thunderstorm Watch	SPC	Aroostook	4 hr
Jul 23, 4:46 PM EDT	Mesoscale Discussion	SPC	Aroostook, Penobscot, Piscataquis, Somerset	59 min

Nearby

Mesoscale Discussions in Maine, 2011 Every mesoscale discussion in 2011

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.