Alert archive / Maine / Mesoscale Discussions in 2018

Mesoscale Discussion 1173

July 27, 20184 counties in Maine

The Storm Prediction Center issued this mesoscale discussion at Jul 27, 2018, 2:06 PM EDT for 4 counties in Maine. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jul 27, 2018, 2:06 PM EDT (18:06 UTC)
Expired
Jul 27, 2018, 4:00 PM EDT
In force
114 min
Issued by
the Storm Prediction Center
Chance of a watch
40%

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

The radar

The Caribou radar (KCBW), 88 km from the middle of the area, began a volume at 18:08 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

Caribou, ME (KCAR), launched 12:00Z, 6.1 hours before the alert went out and 124 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, Caribou, ME at 12:00Z on 2018-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 105 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, Caribou, ME at 12:00Z on 2018-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 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
105 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
789 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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 27, 1:31 PM EDTSevere Thunderstorm WatchSPCAndroscoggin, Cumberland, Franklin, Oxford, York8 hr
Jul 27, 4:50 PM EDTMesoscale DiscussionSPCAndroscoggin, Cumberland, Franklin, Kennebec, Oxford, Somerset and 1 more55 min
Jul 27, 7:06 PM EDTMesoscale DiscussionSPCCumberland, York54 min

Nearby

Mesoscale Discussions in Maine, 2018Every mesoscale discussion in 2018

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.