Alert archive / Pennsylvania / Mesoscale Discussions in 2016
Mesoscale Discussion 1545
The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2016, 4:55 PM EDT for 5 states. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 2016, 4:55 PM EDT (20:55 UTC)
- Expired
- Aug 16, 2016, 6:30 PM EDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 41 counties
New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Cecil County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Delaware County, PA, Lackawanna County, PA, Lancaster County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, Fairfax County, VA, Loudoun County, VA
The radar
The Dover AFB radar (KDOX), 134 km from the middle of the area, began a volume at 20:55 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.9 hours before the alert went out and 139 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
- 364 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 773 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 16, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | New Castle | 4 hr |
| Aug 16, 1:40 PM EDT | Mesoscale Discussion | SPC | Baltimore, Carroll, Frederick, Howard, Montgomery, Prince George's and 2 more | 2 hr |
| Aug 16, 6:40 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett | 2 hr |
| Aug 16, 2:57 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Crawford, Erie, Lawrence, Mercer and 2 more | 2 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2016Mesoscale Discussions in Maryland, 2016Mesoscale Discussions in New Jersey, 2016Every mesoscale discussion in 2016
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.