Alert archive / Pennsylvania / Mesoscale Discussions in 2017
Mesoscale Discussion 1480
The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2017, 5:17 PM EDT for 6 states. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2017, 5:17 PM EDT (21:17 UTC)
- Expired
- Aug 12, 2017, 6:45 PM EDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 63 counties
New Castle County, DE, Baltimore County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Washington County, MD, Sussex County, NJ, Warren County, NJ, Albany County, NY, Broome County, NY, Chenango County, NY, Cortland County, NY, Delaware County, NY, Fulton County, NY, Greene County, NY, Herkimer County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Otsego County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Tioga County, NY, Ulster County, NY, Adams County, PA, Berks County, PA, Bradford County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Juniata County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA, Berkeley County, WV, Jefferson County, WV
The radar
The Binghamton radar (KBGM), 44 km from the middle of the area, began a volume at 21:18 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 nearest sounding before it
Albany, NY (KALY), launched 12:00Z, 9.3 hours before the alert went out and 198 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
- 609 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 4:11 PM EDT | Severe Thunderstorm Watch | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 7 more | 7 hr |
| Aug 12, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | Hunterdon, Warren | 5 hr |
| Aug 12, 1:41 PM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cayuga, Chemung, Chenango, Cortland and 12 more | 2 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2017Mesoscale Discussions in New York, 2017Mesoscale Discussions in Maryland, 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.