Alert archive / New York / Mesoscale Discussions in 2017

Mesoscale Discussion 1548

August 22, 201729 counties in New York; 10 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2017, 11:55 AM EDT for 29 counties in New York; 10 counties in Pennsylvania. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Aug 22, 2017, 11:55 AM EDT (15:55 UTC)
Expired
Aug 22, 2017, 2:30 PM EDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 39 counties

Allegany County, NY, Broome County, NY, Cattaraugus County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Franklin County, NY, Fulton County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Otsego County, NY, Schuyler County, NY, Seneca County, NY, St. Lawrence County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Bradford County, PA, Cameron County, PA, Clinton County, PA, Lycoming County, PA, McKean County, PA, Potter County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Wyoming County, PA

The radar

The Binghamton radar (KBGM), 82 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.

The watches that followed

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 3.9 hours before the alert went out and 158 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, Buffalo Intl Airport, NY at 12:00Z on 2017-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 435 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, Buffalo Intl Airport, NY at 12:00Z on 2017-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.19395878Sfc1 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
435 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
1187 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

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, 12:23 PM EDTTornado WatchSPCAllegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 36 more9 hr
Aug 22, 2:44 PM EDTMesoscale DiscussionSPCAllegany, Broome, Cayuga, Chemung, Chenango, Clinton and 22 more2 hr
Aug 22, 3:08 PM EDTMesoscale DiscussionSPCDelaware, Dutchess, Orange, Putnam, Rockland, Sullivan and 1 more67 min
Aug 22, 3:55 PM EDTSevere Thunderstorm WatchSPCAlbany, Columbia, Dutchess, Greene, Rensselaer, Saratoga and 4 more8 hr
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, 5:49 PM EDTMesoscale DiscussionSPCAlbany, Columbia, Greene, Rensselaer, Washington116 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 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.