Alert archive / New York / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 187

May 1, 201721 counties in New York; Pike County, Wayne County, Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at May 1, 2017, 6:52 PM EDT for 21 counties in New York; Pike County, Wayne County, Pennsylvania. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2017, 6:52 PM EDT (22:52 UTC)
Expired
May 1, 2017, 10:50 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 23 counties

Albany County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Montgomery County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, St. Lawrence County, NY, Sullivan County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Pike County, PA, Wayne County, PA

The radar

The Albany radar (KENX), 75 km from the middle of the area, began a volume at 22:51 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
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 1, 7:21 PM EDTSevere Thunderstorm WarningALYHamilton, Herkimer54 min
May 1, 7:39 PM EDTSevere Thunderstorm WarningALYFulton, Hamilton, Herkimer, Montgomery51 min
May 1, 7:43 PM EDTSevere Thunderstorm WarningBTVClinton, Essex, Franklin, St. Lawrence62 min
May 1, 8:02 PM EDTSevere Thunderstorm WarningBGMBroome, Chenango, Delaware, Otsego58 min
May 1, 8:13 PM EDTSevere Thunderstorm WarningALYHamilton, Warren62 min
May 1, 8:17 PM EDTTornado WarningBGMChenango, Otsego26 min
May 1, 8:22 PM EDTSevere Thunderstorm WarningBTVClinton, Essex, Franklin53 min
May 1, 8:29 PM EDTSevere Thunderstorm WarningBGMDelaware, Sullivan61 min
May 1, 8:31 PM EDTSevere Thunderstorm WarningALYFulton, Hamilton, Herkimer, Montgomery, Saratoga, Warren44 min
May 1, 8:39 PM EDTSevere Thunderstorm WarningBGMDelaware, Otsego66 min
May 1, 8:49 PM EDTSevere Thunderstorm WarningALYSchoharie41 min
May 1, 9:06 PM EDTSevere Thunderstorm WarningALYFulton, Hamilton, Montgomery, Saratoga, Warren22 min
May 1, 9:17 PM EDTSevere Thunderstorm WarningALYGreene, Ulster28 min
May 1, 9:25 PM EDTSevere Thunderstorm WarningALYAlbany, Greene, Saratoga, Schenectady, Schoharie, Ulster39 min
May 1, 9:55 PM EDTSevere Thunderstorm WarningALYRensselaer, Washington29 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

Albany, NY (KALY), launched 12:00Z, 10.9 hours before the alert went out and 76 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, Albany, NY at 12:00Z on 2017-05-01Temperature 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, Albany, NY at 12:00Z on 2017-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 246 square meters per square second.193958Sfc1 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
581 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
246 m²/s²
0-3 km storm-relative helicity
201 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.

IssuedProductOfficeCountiesLasted
May 1, 1:41 PM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Genesee, Livingston, Ontario, Steuben and 2 more64 min
May 1, 2:12 PM EDTTornado WatchSPCAllegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 23 more8 hr
May 1, 4:36 PM EDTMesoscale DiscussionSPCBroome, Cayuga, Chemung, Chenango, Cortland, Madison and 11 more84 min
May 1, 6:29 PM EDTMesoscale DiscussionSPCAlbany, Chenango, Clinton, Columbia, Delaware, Dutchess and 20 more61 min
May 1, 7:16 PM EDTMesoscale DiscussionSPCNew York, Richmond, Rockland, Westchester2 hr
May 1, 11:59 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 8 more2 hr
May 1, 12:32 PM EDTTornado WatchSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 11 more4 hr
May 1, 5:54 PM EDTSevere Thunderstorm WatchSPCAdams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon and 3 more5 hr

Nearby

Severe Thunderstorm Watches in New York, 2017Severe Thunderstorm Watches in Pennsylvania, 2017Every severe thunderstorm watch 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.