Alert archive / New York / Mesoscale Discussions in 2017

Mesoscale Discussion 1549

August 22, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2017, 2:44 PM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 22, 2017, 2:44 PM EDT (18:44 UTC)
Expired
Aug 22, 2017, 4:45 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 44 counties

Grafton County, NH, Allegany County, NY, Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Clinton County, NY, Cortland County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Otsego County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Warren County, NY, Washington County, NY, Yates County, NY, Bradford County, PA, Potter County, PA, Tioga County, PA, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT

The radar

The Ft Drum radar (KTYX), 87 km from the middle of the area, began a volume at 18:44 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 6.7 hours before the alert went out and 123 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 2017-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 87 joules per kilogram.LCLLFCEL10008507005003002001001 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 2017-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 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
87 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
932 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 22, 3:55 PM EDTSevere Thunderstorm WatchSPCBelknap, Carroll, Cheshire, Coos, Grafton, Hillsborough and 4 more8 hr
Aug 22, 5:49 PM EDTMesoscale DiscussionSPCCheshire, Coos, Grafton, Sullivan116 min
Aug 22, 11:55 AM EDTMesoscale DiscussionSPCAllegany, Broome, Cattaraugus, Cayuga, Chemung, Chenango and 23 more3 hr
Aug 22, 12:23 PM EDTTornado WatchSPCAllegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 36 more9 hr
Aug 22, 3:08 PM EDTMesoscale DiscussionSPCDelaware, Dutchess, Orange, Putnam, Rockland, Sullivan and 1 more67 min
Aug 22, 4:19 PM EDTSevere Thunderstorm WatchSPCDelaware, Orange, Putnam, Rockland, Sullivan, Westchester8 hr
Aug 22, 4:48 PM EDTMesoscale DiscussionSPCBroome, Cayuga, Chemung, Chenango, Clinton, Cortland and 21 more87 min
Aug 22, 7:07 PM EDTMesoscale DiscussionSPCBronx, Columbia, Delaware, Dutchess, Greene, Kings and 8 more113 min
Aug 22, 11:54 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Butler, Clarion, Greene and 5 more66 min
Aug 22, 12:39 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 16 more8 hr
Aug 22, 2:44 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Blair, Butler, Cambria and 13 more91 min
Aug 22, 4:39 PM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Blair, Butler, Cambria and 13 more66 min

Nearby

Mesoscale Discussions in New York, 2017Mesoscale Discussions in Vermont, 2017Mesoscale Discussions in Pennsylvania, 2017Every mesoscale discussion 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.