Alert archive / Pennsylvania / Mesoscale Discussions in 2025

Mesoscale Discussion 151

March 5, 20254 states

The Storm Prediction Center issued this mesoscale discussion at Mar 5, 2025, 2:19 PM EST for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued
Mar 5, 2025, 2:19 PM EST (19:19 UTC)
Expired
Mar 5, 2025, 4:15 PM EST
In force
116 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch possible
Chance of a watch
40%
All 59 counties

Allegany County, MD, Garrett County, MD, Washington County, MD, Allegheny County, PA, Armstrong County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Clarion County, PA, Clearfield County, PA, Crawford County, PA, Elk County, PA, Fayette County, PA, Forest County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Somerset County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Augusta County, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, Madison County, VA, Page County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Barbour County, WV, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Harrison County, WV, Jefferson County, WV, Marion County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Pendleton County, WV, Preston County, WV, Randolph County, WV, Taylor County, WV, Tucker County, WV, Upshur County, WV

The radar

The Pittsburgh radar (KPBZ), 103 km from the middle of the area, began a volume at 19:22 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.3 hours before the alert went out and 196 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.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2025-03-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2025-03-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 369 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
675 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
369 m²/s²
0-3 km storm-relative helicity
421 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 5, 10:27 AM ESTSevere Thunderstorm WatchSPCAnne Arundel, Calvert, Charles, Dorchester, Prince George's, Saint Mary's and 3 more8 hr
Mar 5, 1:02 PM ESTMesoscale DiscussionSPCCharles, Dorchester, Saint Mary's, Somerset, Wicomico, Worcester88 min
Mar 5, 8:50 AM ESTMesoscale DiscussionSPCAmelia, Appomattox, Brunswick, Buckingham, Campbell, Charles City and 24 more115 min
Mar 5, 10:35 AM ESTMesoscale DiscussionSPCBrunswick, Greensville, Isle of Wight, Mecklenburg, Southampton, Sussex and 10 more85 min
Mar 5, 12:26 PM ESTTornado WatchSPCGreensville, Isle of Wight, James City, Southampton, Surry, Sussex and 12 more7 hr
Mar 5, 2:23 PM ESTMesoscale DiscussionSPCGreensville, Isle of Wight, Southampton, Surry, Sussex, York and 11 more97 min
Mar 5, 4:30 PM ESTMesoscale DiscussionSPCIsle of Wight, Surry, York, City of Chesapeake, City of Franklin, City of Hampton and 7 more90 min

Nearby

Mesoscale Discussions in Pennsylvania, 2025Mesoscale Discussions in West Virginia, 2025Mesoscale Discussions in Virginia, 2025Every mesoscale discussion in 2025

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.