Alert archive / New York / Mesoscale Discussions in 2015
Mesoscale Discussion 407
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2015, 7:31 PM EDT for 11 counties in New York; Lackawanna County, Susquehanna County, Wayne County, Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2015, 7:31 PM EDT (23:31 UTC)
- Expired
- Apr 20, 2015, 10:00 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Schuyler County, NY, Seneca County, NY, Tioga County, NY, Tompkins County, NY, Yates County, NY, Lackawanna County, PA, Susquehanna County, PA, Wayne County, PA
The radar
The Binghamton radar (KBGM), 9 km from the middle of the area, began a volume at 23:34 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, 11.5 hours before the alert went out and 237 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 982 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 429 m²/s²
- 0-3 km storm-relative helicity
- 437 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 3:23 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chemung, Cortland and 16 more | 2 hr |
| Apr 20, 7:56 PM EDT | Severe Thunderstorm Watch | SPC | Broome, Cayuga, Chemung, Cortland, Schuyler, Seneca and 4 more | 4 hr |
| Apr 20, 1:54 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Franklin, Fulton, Lancaster and 1 more | 3 hr |
| Apr 20, 3:08 PM EDT | Tornado Watch | SPC | Adams, Bedford, Berks, Blair, Bucks, Cambria and 32 more | 9 hr |
| Apr 20, 5:01 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Berks, Blair, Chester, Cumberland and 10 more | 119 min |
| Apr 20, 5:57 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Centre, Clinton, Columbia, Luzerne and 9 more | 2 hr |
Nearby
Mesoscale Discussions in New York, 2015Mesoscale Discussions in Pennsylvania, 2015Every mesoscale discussion 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.