Alert archive / Pennsylvania / Mesoscale Discussions in 2016
Mesoscale Discussion 454
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2016, 1:19 PM EDT for 6 states. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2016, 1:19 PM EDT (17:19 UTC)
- Expired
- Apr 26, 2016, 2:45 PM EDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 59 counties
New Castle County, DE, Allegany County, MD, Baltimore County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Washington County, MD, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Salem County, NJ, Somerset County, NJ, Union County, NJ, Warren County, NJ, Richmond County, NY, Adams County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Bucks County, PA, Cambria County, PA, Chester County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Indiana County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Mifflin County, PA, Montgomery County, PA, Northampton County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Westmoreland County, PA, York County, PA, Berkeley County, WV, Hampshire County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV
The radar
The State College radar (KCCX), 119 km from the middle of the area, began a volume at 17:22 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.3 hours before the alert went out and 113 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
- 25 J/kg
- Mixed-layer CIN
- -252 J/kg
- Mixed-layer LCL
- 1659 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 173 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 |
|---|---|---|---|---|
| Apr 26, 1:54 PM EDT | Severe Thunderstorm Watch | SPC | Kent, New Castle, Sussex | 6 hr |
| Apr 26, 6:46 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 59 min |
| Apr 26, 1:58 PM EDT | Mesoscale Discussion | SPC | Braxton, Cabell, Calhoun, Clay, Doddridge, Gilmer and 15 more | 3 hr |
| Apr 26, 6:05 PM EDT | Mesoscale Discussion | SPC | Boone, Braxton, Cabell, Calhoun, Clay, Doddridge and 19 more | 115 min |
| Apr 26, 6:45 PM EDT | Severe Thunderstorm Watch | SPC | Barbour, Boone, Braxton, Cabell, Calhoun, Clay and 33 more | 6 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2016Mesoscale Discussions in New Jersey, 2016Mesoscale Discussions in Maryland, 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.