Alert archive / New Hampshire / Tornado Warnings in 2017

Tornado Warning 3, NWS Gray, ME

July 1, 2017Grafton County, New Hampshire

NWS Gray, ME issued this tornado warning at Jul 1, 2017, 3:23 PM EDT for Grafton County, New Hampshire. It was in force for 14 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: Jul 1, 2017, 3:23 PM EDT (19:23 UTC)
Expired: Jul 1, 2017, 3:37 PM EDT
In force: 14 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Grafton County, NH

The radar

The Portland,ME radar (KGYX), 99 km from the middle of the area, began a volume at 19:25 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 1, 1:19 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 7.4 hours before the alert went out and 99 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: 115 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

406 
WFUS51 KGYX 011923
TORGYX
NHC009-012000-
/O.NEW.KGYX.TO.W.0003.170701T1923Z-170701T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Gray ME
323 PM EDT SAT JUL 1 2017

The National Weather Service in Gray Maine has issued a

* Tornado Warning for...
  East central Grafton County in northern New Hampshire...

* Until 400 PM EDT
    
* At 323 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Woodstock, or 9 miles southeast of Lincoln, moving
  northeast at 25 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Lincoln around 400 PM EDT. 

Other locations impacted by this tornadic thunderstorm include
Livermore, Waterville Valley and Thornton.

This also includes...
  Mount Whiteface, Mount Osceola, Mount Tecumseh, Welch Mountain, and
Dickey Mountain.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4409 7141 4403 7138 4394 7137 4390 7152
      4390 7155 4388 7156 4387 7161 4394 7164
TIME...MOT...LOC 1923Z 229DEG 23KT 4392 7159 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$
EKSTER

3 follow-up statements

251 
WWUS51 KGYX 011928
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
328 PM EDT SAT JUL 1 2017

NHC009-012000-
/O.CON.KGYX.TO.W.0003.000000T0000Z-170701T2000Z/
Grafton NH-
328 PM EDT SAT JUL 1 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM EDT FOR EAST
CENTRAL GRAFTON COUNTY...
    
At 327 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Woodstock, or 7 miles southeast of Lincoln, moving
northeast at 20 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This tornadic thunderstorm will remain over mainly rural areas of
east central Grafton County, including the following locations:
Livermore, Waterville Valley and Thornton.

This also includes...
  Mount Osceola, Mount Tecumseh, Welch Mountain, Dickey Mountain, and
Greeley Ponds.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4391 7156 4394 7164 4407 7143 4406 7139
      4404 7139
TIME...MOT...LOC 1927Z 211DEG 18KT 4396 7157 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$
MLE

534 
WWUS51 KGYX 011933
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
333 PM EDT SAT JUL 1 2017

NHC009-012000-
/O.CON.KGYX.TO.W.0003.000000T0000Z-170701T2000Z/
Grafton NH-
333 PM EDT SAT JUL 1 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM EDT FOR EAST
CENTRAL GRAFTON COUNTY...
    
At 333 PM EDT, a severe thunderstorm capable of producing a tornado
was located 7 miles east of Woodstock, or 7 miles southeast of
Lincoln, moving northeast at 20 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations impacted include...
Livermore and Waterville Valley. 

This also includes...
  Mount Osceola, Mount Tecumseh, and Greeley Ponds.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4394 7156 4397 7160 4403 7149 4402 7147
      4400 7148
TIME...MOT...LOC 1933Z 224DEG 18KT 4398 7154 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$
mle

240 
WWUS51 KGYX 011937
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
337 PM EDT SAT JUL 1 2017

NHC009-011947-
/O.CAN.KGYX.TO.W.0003.000000T0000Z-170701T2000Z/
Grafton NH-
337 PM EDT SAT JUL 1 2017

...THE TORNADO WARNING FOR EAST CENTRAL GRAFTON COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 900 PM EDT for
northern New Hampshire.

LAT...LON 4394 7156 4397 7160 4403 7149 4402 7147
      4400 7148
TIME...MOT...LOC 1936Z 229DEG 23KT 4400 7151 

$$
MLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 10:32 AM EDT	Special Weather Statement	GYX	Merrimack	28 min
Jul 1, 11:01 AM EDT	Special Weather Statement	GYX	Sullivan	29 min
Jul 1, 12:14 PM EDT	Special Weather Statement	GYX	Grafton	61 min
Jul 1, 1:13 PM EDT	Special Weather Statement	GYX	Grafton	62 min
Jul 1, 1:34 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Grafton	41 min
Jul 1, 1:46 PM EDT	Tornado Warning	GYX	Carroll, Grafton	26 min
Jul 1, 3:18 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	57 min
Jul 1, 3:45 PM EDT	Beach Hazards Statement	GYX	Rockingham	29 hr
Jul 1, 3:46 PM EDT	Special Weather Statement	GYX	Carroll	29 min
Jul 1, 3:51 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	39 min
Jul 1, 4:02 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	58 min
Jul 1, 4:08 PM EDT	Areal Flood Advisory	GYX	Coos, Grafton	2 hr
Jul 1, 4:13 PM EDT	Tornado Warning	GYX	Carroll	47 min
Jul 1, 4:19 PM EDT	Flash Flood Warning	GYX	Coos, Grafton	116 min
Jul 1, 4:40 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Coos, Grafton	65 min
Jul 1, 5:01 PM EDT	Tornado Warning	GYX	Carroll	21 min
Jul 1, 5:04 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Sullivan	56 min
Jul 1, 5:10 PM EDT	Flash Flood Warning	GYX	Carroll, Coos, Grafton	2 hr
Jul 1, 5:39 PM EDT	Flash Flood Warning	GYX	Belknap, Grafton, Merrimack, Sullivan	2 hr
Jul 1, 5:48 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	42 min
Jul 1, 5:50 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton, Merrimack	55 min
Jul 1, 6:19 PM EDT	Areal Flood Warning	GYX	Coos, Grafton	116 min
Jul 1, 6:36 PM EDT	River Flood Warning	GYX	Grafton	17 hr
Jul 1, 6:58 PM EDT	Flash Flood Warning	GYX	Carroll	3 hr
Jul 1, 7:16 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Grafton, Hillsborough, Merrimack, Sullivan	59 min
Jul 1, 7:58 PM EDT	Flash Flood Warning	GYX	Grafton, Sullivan	2 hr

Nearby

Tornado Warnings in New Hampshire, 2017 Every tornado warning in 2017 Tornadoes 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.