Alert archive / New York / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 233

May 28, 20157 states

The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2015, 11:54 AM EDT for 7 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2015, 11:54 AM EDT (15:54 UTC)
Expired: May 28, 2015, 7:00 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 55 kt

All 73 counties

Capitol Planning Region, CT, Greater Bridgeport Planning Region, CT, Lower Connecticut River Valley Planning Region, CT, Naugatuck Valley Planning Region, CT, Northeastern Connecticut Planning Region, CT, Northwest Hills Planning Region, CT, Southeastern Connecticut Planning Region, CT, Berkshire County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Androscoggin County, ME, Aroostook County, ME, Cumberland County, ME, Franklin County, ME, Hancock County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, Washington County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Morris County, NJ, Passaic County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Bronx County, NY, Columbia County, NY, Dutchess County, NY, Greene County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Rensselaer County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Ulster County, NY, Washington County, NY, Westchester County, NY, Bennington County, VT, Orange County, VT, Rutland County, VT, Windham County, VT, Windsor County, VT

The radar

The Portland,ME radar (KGYX), 60 km from the middle of the area, began a volume at 15:57 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 28, 12:25 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook, Penobscot, Piscataquis	35 min
May 28, 12:31 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Franklin, Kennebec, Oxford, Somerset	44 min
May 28, 12:44 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook	61 min
May 28, 1:07 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook, Penobscot	38 min
May 28, 1:15 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Kennebec, Somerset, Waldo	45 min
May 28, 1:27 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook, Penobscot, Piscataquis	63 min
May 28, 1:43 PM EDT	Severe Thunderstorm Warning	CAR	Penobscot, Piscataquis	62 min
May 28, 1:45 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	45 min
May 28, 2:26 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Cumberland, Kennebec, Sagadahoc	49 min
May 28, 2:30 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook, Penobscot, Washington	43 min
May 28, 2:31 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	44 min
May 28, 2:36 PM EDT	Severe Thunderstorm Warning	ALY	Windham	24 min
May 28, 2:40 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire	50 min
May 28, 3:15 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	45 min
May 28, 3:22 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Oxford, Somerset	38 min
May 28, 3:29 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough	32 min
May 28, 3:36 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region, Naugatuck Valley Planning Region	29 min
May 28, 3:40 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Kennebec, Somerset, Waldo	50 min
May 28, 3:44 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Middlesex, Worcester	46 min
May 28, 3:49 PM EDT	Severe Thunderstorm Warning	GYX	Hillsborough, Rockingham	41 min
May 28, 3:55 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Merrimack, Rockingham, Strafford	34 min
May 28, 3:59 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	46 min
May 28, 4:03 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	27 min
May 28, 4:07 PM EDT	Flash Flood Warning	OKX	Greater Bridgeport Planning Region	3 hr
May 28, 4:10 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	50 min
May 28, 4:14 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, York	46 min
May 28, 4:24 PM EDT	Severe Thunderstorm Warning	CAR	Hancock, Penobscot, Washington	66 min
May 28, 4:27 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, York	48 min
May 28, 4:37 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Kennebec, Somerset, Waldo	53 min
May 28, 4:38 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	37 min
May 28, 4:41 PM EDT	Severe Thunderstorm Warning	GYX	Hillsborough, Rockingham	22 min
May 28, 4:45 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	45 min
May 28, 4:48 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Middlesex, Worcester	57 min
May 28, 5:20 PM EDT	Severe Thunderstorm Warning	OKX	Greater Bridgeport Planning Region	40 min
May 28, 5:40 PM EDT	Severe Thunderstorm Warning	BOX	Essex	35 min
May 28, 5:52 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Kennebec, Sagadahoc	23 min
May 28, 5:56 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	49 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 3.9 hours before the alert went out and 60 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: 60 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1028 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Lasted
May 28, 11:16 AM EDT	Mesoscale Discussion	SPC	89 min
May 28, 11:30 AM EDT	Mesoscale Discussion	SPC	60 min
May 28, 3:08 PM EDT	Mesoscale Discussion	SPC	97 min
May 28, 4:26 PM EDT	Mesoscale Discussion	SPC	64 min

Nearby

Severe Thunderstorm Watches in New York, 2015 Severe Thunderstorm Watches in Maine, 2015 Severe Thunderstorm Watches in New Hampshire, 2015 Every severe thunderstorm watch 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.