Alert archive / Pennsylvania / Mesoscale Discussions in 2014
Mesoscale Discussion 611
The Storm Prediction Center issued this mesoscale discussion at May 15, 2014, 5:33 PM EDT for 12 counties in Maryland; 25 counties in Pennsylvania. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- May 15, 2014, 5:33 PM EDT (21:33 UTC)
- Expired
- May 15, 2014, 7:30 PM EDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 37 counties
Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, City of Baltimore, MD, Harford County, MD, Kent County, MD, Prince George's County, MD, Queen Anne's County, MD, Talbot County, MD, Adams County, PA, Berks County, PA, Bradford County, PA, Centre County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, York County, PA
The radar
The Sterling radar (KLWX), 142 km from the middle of the area, began a volume at 21:35 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, 9.6 hours before the alert went out and 141 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
- 5 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 591 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 142 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 |
|---|---|---|---|---|
| May 15, 11:56 AM EDT | Severe Thunderstorm Watch | SPC | Frederick, Montgomery, Washington | 8 hr |
| May 15, 3:22 PM EDT | Mesoscale Discussion | SPC | Allegany, Frederick, Montgomery, Washington | 53 min |
| May 15, 6:24 PM EDT | Mesoscale Discussion | SPC | Frederick, Montgomery, Washington | 96 min |
| May 14, 9:33 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Butler, Clarion, Crawford, Erie and 6 more | 87 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2014Mesoscale Discussions in Maryland, 2014Every mesoscale discussion in 2014
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.