Alert archive / New Hampshire / Special Weather Statements in 2021

Special Weather Statement, NWS Gray, ME

January 20, 2021Belknap County, Merrimack County, Strafford County, New Hampshire

NWS Gray, ME issued this special weather statement at Jan 20, 2021, 5:23 PM EST for Belknap County, Merrimack County, Strafford County, New Hampshire. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jan 20, 2021, 5:23 PM EST (22:23 UTC)
Expired
Jan 20, 2021, 6:30 PM EST
In force
67 min
Issued by
NWS Gray, ME

Counties Belknap County, NH, Merrimack County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 109 km from the middle of the area, began a volume at 22:23 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

Gray, ME (KGYX), launched 12:00Z, 10.4 hours before the alert went out and 109 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 2021-01-20Temperature 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, Gray, ME at 12:00Z on 2021-01-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 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
827 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gray, ME wrote its last area forecast discussion before this special weather statement went out at Jan 20, 5:01 PM EST, 22 minutes earlier.

Area forecast discussion, Jan 20, 5:01 PM EST, 22 minutes before
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Hazardous weather outlook, Jan 20, 3:09 PM EST, 2 hours 14 minutes before
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In the hours before

Special weather statement, Jan 20, 12:05 PM EST, 5 hours 18 minutes before
Special Weather Statement
National Weather Service Gray ME
1205 PM EST Wed Jan 20 2021

NHZ002-003-201745-
Northern Grafton-Southern Coos-
1205 PM EST Wed Jan 20 2021

...An area of heavy snow will affect southwestern Coos and
northeastern Grafton Counties...

At 1203 PM EST...An area of heavy snow was over Gilman, or 7 miles
southwest of Lancaster...moving east AT 10 MPH.

Locations impacted include...
Berlin, Littleton, Lancaster, Bethlehem, Franconia, Carroll, Gorham,
Jefferson, Dalton, Whitefield, Northumberland, Randolph and Stark.

This includes Interstate 93 between mile markers 121 and 128, and
near mile marker 130.

This also includes...
  North Twin Mountain, AMC Zealand Falls Hut, and Mount Cabot.

  * Visibilities could drop quickly to less than a mile in this area
  of heavy snow.

  * Snowfall rates of 1 to 2 inches per hour are possible in this
  area of heavy snow.

Conditions can deteriorate rapidly in winter weather situations. Be
prepared for snow or ice covered roads. Slow down and allow extra
time when traveling.

LAT...LON 4436 7181 4438 7182 4440 7179 4441 7171
      4444 7166 4449 7163 4448 7163 4450 7158
      4452 7159 4453 7158 4456 7160 4457 7159
      4457 7156 4445 7123 4417 7149 4433 7188
TIME...MOT...LOC 1703Z 291DEG 10KT 4441 7168

Watson
Local storm report, Jan 20, 2:18 PM EST, 3 hours 5 minutes before
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Special weather statement, Jan 20, 5:23 PM EST, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jan 20, 11:10 AM ESTSpecial Weather StatementGYXGrafton50 min
Jan 20, 12:05 PM ESTSpecial Weather StatementGYXCoos40 min

Nearby

Special Weather Statements in New Hampshire, 2021Every special weather statement in 2021

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.