Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 53, NWS Gray, ME

July 17, 2017Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 17, 2017, 5:07 PM EDT for Grafton County, New Hampshire. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 17, 2017, 5:07 PM EDT (21:07 UTC)
Expired: Jul 17, 2017, 6:00 PM EDT
In force: 53 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Grafton County, NH

The radar

The Burlington radar (KCXX), 125 km from the middle of the area, began a volume at 21:07 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, 9.1 hours before the alert went out and 125 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: 478 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 17, 2:43 PM EDT, 2 hours 24 minutes earlier.

Area forecast discussion, Jul 17, 2:43 PM EDT, 2 hours 24 minutes before

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Hazardous weather outlook, Jul 17, 2:50 PM EDT, 2 hours 17 minutes before

Hazardous Weather Outlook
National Weather Service Gray ME
250 PM EDT Mon Jul 17 2017

MEZ007>009-012-NHZ001>013-015-181900-
Northern Oxford-Northern Franklin-Central Somerset-Southern Oxford-
Northern Coos-Southern Coos-Northern Grafton-Northern Carroll-
Southern Grafton-Southern Carroll-Sullivan-Merrimack-Belknap-
Strafford-Cheshire-Eastern Hillsborough-Interior Rockingham-
Western And Central Hillsborough-
250 PM EDT Mon Jul 17 2017

This Hazardous Weather Outlook is for west central Maine, western
Maine, New Hampshire, central New Hampshire, northern New Hampshire
and southern New Hampshire.

.DAY ONE...This Afternoon and Tonight.

Scattered thunderstorms this afternoon and early this evening could
produce gusty winds, small hail and locally heavy rainfall.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MEZ013-014-018>028-NHZ014-181900-
Southern Franklin-Southern Somerset-Interior York-
Interior Cumberland-Androscoggin-Kennebec-Interior Waldo-
Coastal York-Coastal Cumberland-Sagadahoc-Lincoln-Knox-Coastal Waldo-
Coastal Rockingham-
250 PM EDT Mon Jul 17 2017

This Hazardous Weather Outlook is for Maine, south central Maine,
southwest Maine, western Maine and southern New Hampshire.

.DAY ONE...This Afternoon and Tonight.

Some thunderstorms are possible this evening. Though they will be
weakening as they move east, some storms may contain locally heavy
rainfall.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ150>154-181900-
Coastal Waters from Stonington, ME to Port Clyde, ME out 25 NM-
Penobscot Bay-
Coastal Waters from Port Clyde, ME to Cape Elizabeth, ME out 25 NM-
Casco Bay-
Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out
25 NM-
250 PM EDT Mon Jul 17 2017

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jul 17, 3:49 PM EDT, 1 hour 18 minutes before

Special Weather Statement
National Weather Service Gray ME
349 PM EDT MON JUL 17 2017

NHZ001-172015-
Northern Coos-
349 PM EDT MON JUL 17 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN COOS COUNTY...

At 349 PM EDT, a strong thunderstorm was located near Pittsburg, or
16 miles northeast of Colebrook, moving northeast at 20 mph.

Winds in excess of 40 mph and dime size hail are possible with this
storm.

Locations impacted include...
Pittsburg, Clarksville, Parmachenee and Bowmantown.

This also includes...
  First Connecticut Lake, Lake Francis State Park, Second Connecticut
Lake, and Third Connecticut Lake.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4515 7107 4501 7136 4507 7149 4512 7143
      4514 7144 4520 7140 4524 7144 4524 7140
      4523 7138 4525 7136 4527 7136 4530 7130
      4529 7127 4525 7123 4525 7120 4524 7118
      4525 7116 4524 7115 4531 7108
TIME...MOT...LOC 1949Z 210DEG 15KT 4511 7134

Legro

Special weather statement, Jul 17, 3:58 PM EDT, 1 hour 9 minutes before

Special Weather Statement
National Weather Service Gray ME
358 PM EDT MON JUL 17 2017

NHZ003-172030-
Northern Grafton-
358 PM EDT MON JUL 17 2017

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTH CENTRAL GRAFTON
COUNTY...

At 358 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Lower Waterford to Haverhill.
Movement was east at 25 mph.

Winds in excess of 30 mph and pea size hail are possible with these
storms.

Locations impacted include...
Littleton, Bethlehem, Lincoln, Haverhill, Franconia, Piermont,
Woodstock, Lisbon, Bath, Benton, Easton, Monroe, Landaff, Lyman and
Sugar Hill.

This includes Interstate 93 between mile markers 100 and 131.

This also includes...
  Franconia Notch, Mount Moosilauke, Cannon Mountain, Franconia
Ridge, and Mount Lafayette.

Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4401 7211 4408 7203 4409 7205 4410 7203
      4411 7206 4413 7203 4419 7206 4424 7205
      4428 7206 4430 7203 4432 7203 4435 7182
      4439 7180 4440 7176 4433 7170 4431 7159
      4428 7158 4399 7169 4395 7210 4399 7212
TIME...MOT...LOC 1958Z 253DEG 20KT 4444 7188 4404 7204

Legro

Special weather statement, Jul 17, 4:00 PM EDT, 1 hour 7 minutes before

Special Weather Statement
National Weather Service Gray ME
400 PM EDT MON JUL 17 2017

MEZ007-012-NHZ002-004-172030-
Northern Oxford-Southern Oxford-Southern Coos-Northern Carroll-
400 PM EDT MON JUL 17 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL OXFORD COUNTY...

At 359 PM EDT, a strong thunderstorm was located near Bethel, moving
northeast at 25 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Bethel, Rumford, Andover, Greenwood, Chatham, Hanover, Gilead, West
Paris, Woodstock, Mason, Batchelders Grant, Milton, Newry, Paris,
Albany, Stoneham, Norway, Riley, Roxbury and Shelburne.

This also includes...
  Speckled Mountain, Evans Notch, Caribou Mountain, West Royce
Mountain, and East Royce Mountain.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4426 7104 4438 7105 4463 7063 4425 7046
TIME...MOT...LOC 1959Z 231DEG 22KT 4436 7083

Legro

Special weather statement, Jul 17, 4:28 PM EDT, 39 minutes before

Special Weather Statement
National Weather Service Gray ME
428 PM EDT MON JUL 17 2017

MEZ007-012-013-172100-
Northern Oxford-Southern Oxford-Southern Franklin-
428 PM EDT MON JUL 17 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL OXFORD COUNTY...

At 427 PM EDT, a strong thunderstorm was located over Bethel, moving
northeast at 20 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Bethel, Rumford, Andover, Mexico, Greenwood, Hanover, Gilead, Mason,
Milton, Newry, Roxbury, Peru, Woodstock, Riley and Albany.

This also includes...
  Mount Zircon.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4432 7090 4446 7091 4468 7062 4447 7038
TIME...MOT...LOC 2027Z 231DEG 16KT 4444 7076

Legro

Special weather statement, Jul 17, 4:31 PM EDT, 36 minutes before

Special Weather Statement
National Weather Service Gray ME
431 PM EDT MON JUL 17 2017

MEZ007-008-172100-
Northern Oxford-Northern Franklin-
431 PM EDT MON JUL 17 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN OXFORD AND WEST
CENTRAL FRANKLIN COUNTIES...

At 431 PM EDT, a strong thunderstorm was located 14 miles northwest
of Rangeley, moving northeast at 15 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Coburn Gore, Upper Cupsuptic, Stetsontown, Massachusetts Gore, Seven
Ponds, Davis, Oxbow, Alder Stream, Lower Cupsuptic, Lynchtown, Chain
Of Ponds, Jim Pond, Tim Pond, Parkertown and Parmachenee.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4527 7052 4501 7087 4507 7102 4528 7092
      4524 7089 4523 7086 4524 7084 4524 7085
      4526 7085 4529 7083 4530 7081 4532 7080
      4534 7082 4537 7080
TIME...MOT...LOC 2031Z 207DEG 13KT 4510 7087

Legro

Special weather statement, Jul 17, 4:46 PM EDT, 21 minutes before

Special Weather Statement
National Weather Service Gray ME
446 PM EDT MON JUL 17 2017

NHZ003-005-172115-
Northern Grafton-Southern Grafton-
446 PM EDT MON JUL 17 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL GRAFTON COUNTY...

At 446 PM EDT, a strong thunderstorm was located 10 miles southeast
of Piermont, or 14 miles southwest of Lincoln, moving east at 20 mph.

Winds in excess of 40 mph and dime size hail are possible with this
storm.

Locations impacted include...
Lincoln, Plymouth, Haverhill, Holderness, Franconia, Groton,
Woodstock, Piermont, Lyme, Benton, Dorchester, Easton, Ellsworth,
Wentworth, Rumney, Campton, Thornton, Orford and Livermore.

This includes Interstate 93 between mile markers 81 and 108.

This also includes...
  Mount Moosilauke, Rumney Rocks, Franconia Ridge, Carr Mountain, and
Stinson Mountain.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4402 7209 4403 7208 4417 7158 4377 7164
      4379 7210
TIME...MOT...LOC 2046Z 255DEG 18KT 4391 7189

Legro

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 9:10 PM EDT	Special Weather Statement	GYX	Kennebec	35 min
Jul 17, 1:09 PM EDT	Special Weather Statement	GYX	Somerset	36 min
Jul 17, 1:52 PM EDT	Special Weather Statement	GYX	Somerset	23 min
Jul 17, 2:16 PM EDT	Special Weather Statement	GYX	Somerset	29 min
Jul 17, 2:41 PM EDT	Special Weather Statement	GYX	Somerset	34 min
Jul 17, 2:55 PM EDT	Special Weather Statement	GYX	Oxford	35 min
Jul 17, 3:32 PM EDT	Special Weather Statement	GYX	Oxford	28 min
Jul 17, 3:49 PM EDT	Special Weather Statement	GYX		26 min
Jul 17, 4:00 PM EDT	Special Weather Statement	GYX	Oxford	30 min
Jul 17, 4:28 PM EDT	Special Weather Statement	GYX	Oxford	32 min
Jul 17, 4:31 PM EDT	Special Weather Statement	GYX	Franklin	29 min
Jul 17, 5:18 PM EDT	Areal Flood Advisory	GYX	Oxford	3 hr
Jul 17, 5:42 PM EDT	Severe Thunderstorm Warning	GYX	Somerset	63 min
Jul 17, 6:14 PM EDT	Areal Flood Advisory	GYX	Somerset	3 hr
Jul 17, 6:27 PM EDT	Flash Flood Warning	GYX	Somerset	4 hr
Jul 17, 3:58 PM EDT	Special Weather Statement	GYX	Grafton	32 min
Jul 17, 4:29 PM EDT	Areal Flood Advisory	GYX	Coos	3 hr
Jul 17, 4:46 PM EDT	Special Weather Statement	GYX	Grafton	29 min
Jul 17, 7:06 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	54 min
Jul 17, 7:10 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Coos, Grafton	65 min
Jul 17, 7:58 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	62 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2017 Every severe thunderstorm warning in 2017

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.