Alert archive / Maine / Frost Advisories in 2015

Frost Advisory 2, NWS Gray, ME

May 20, 20158 counties in Maine; 5 counties in New Hampshire

NWS Gray, ME issued this frost advisory at May 20, 2015, 2:25 PM EDT for 8 counties in Maine; 5 counties in New Hampshire. It took effect at May 21, 2015, 2:00 AM EDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
May 20, 2015, 2:25 PM EDT (18:25 UTC)
In effect from
May 21, 2015, 2:00 AM EDT
Expired
May 21, 2015, 6:48 AM EDT
In force
5 hr
Issued by
NWS Gray, ME

Counties Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Sagadahoc County, ME, Waldo County, ME, York County, ME, Belknap County, NH, Cheshire County, NH, Hillsborough County, NH, Merrimack County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 29 km from the middle of the area, began a volume at 18:27 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

Albany, NY (KALY), launched 12:00Z, 6.4 hours before the alert went out and 292 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, Albany, NY at 12:00Z on 2015-05-20Temperature 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, Albany, NY at 12:00Z on 2015-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.193958Sfc1 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
1202 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
-19 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 8:42 PM EDTSpecial Weather StatementGYXFranklin33 min
May 20, 3:14 AM EDTFreeze WatchGYXFranklin, Oxford, Somerset11 hr
May 20, 2:25 PM EDTFreeze WarningGYXFranklin, Oxford, Somerset16 hr

Nearby

Frost Advisories in Maine, 2015Frost Advisories in New Hampshire, 2015Every frost advisory in 2015

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.