Alert archive / Maine / High Wind Watches in 2020

High Wind Watch 4, NWS Gray, ME

December 22, 20208 counties in Maine; Hillsborough County, Rockingham County, Strafford County, New Hampshire

NWS Gray, ME issued this high wind watch at Dec 22, 2020, 3:37 PM EST for 8 counties in Maine; Hillsborough County, Rockingham County, Strafford County, New Hampshire. It took effect at Dec 24, 2020, 10:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 22, 2020, 3:37 PM EST (20:37 UTC)
In effect from
Dec 24, 2020, 10:00 PM EST
Expired
Dec 24, 2020, 3:39 PM EST
In force
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, Hillsborough County, NH, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 14 km from the middle of the area, began a volume at 20:40 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

Chatham, MA (KCHH), launched 12:00Z, 8.6 hours before the alert went out and 234 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, Chatham, MA at 12:00Z on 2020-12-22Temperature 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, Chatham, MA at 12:00Z on 2020-12-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
1220 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
26 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
Dec 22, 2:47 AM ESTSmall Craft AdvisoryGYX13 hr
Dec 22, 3:32 PM ESTStorm WatchGYX42 hr

Nearby

High Wind Watches in Maine, 2020High Wind Watches in New Hampshire, 2020Every high wind watch in 2020

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.