Alert archive / Virginia / Winter Storm Warnings in 2015

Winter Storm Warning 9, NWS Baltimore/Washington

March 4, 201533 counties in Virginia; 14 counties in Maryland; 8 counties in West Virginia

NWS Baltimore/Washington issued this winter storm warning at Mar 4, 2015, 4:51 AM EST for 33 counties in Virginia; 14 counties in Maryland; 8 counties in West Virginia. It took effect at Mar 4, 2015, 7:00 PM EST. It was in force for 25 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 4, 2015, 4:51 AM EST (09:51 UTC)
In effect from: Mar 4, 2015, 7:00 PM EST
Expired: Mar 5, 2015, 7:47 PM EST
In force: 25 hr
Issued by: NWS Baltimore/Washington

All 55 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Albemarle County, VA, Amherst County, VA, Arlington County, VA, Augusta County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Rappahannock County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 47 km from the middle of the area, began a volume at 09:53 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 00:00Z, 9.9 hours before the alert went out and 53 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 909 m above ground
0-6 km bulk shear: 89 kt
0-1 km storm-relative helicity: 904 m²/s²
0-3 km storm-relative helicity: 1059 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this winter storm warning went out at Mar 4, 4:01 AM EST, 50 minutes earlier.

Area forecast discussion, Mar 4, 4:01 AM EST, 50 minutes before

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Hazardous weather outlook, Mar 4, 2:11 AM EST, 2 hours 40 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 4, 12:28 AM EST	Small Craft Advisory	LWX		6 hr
Mar 4, 6:44 PM EST	Dense Fog Advisory	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	2 hr
Mar 4, 1:57 AM EST	Freezing Rain Advisory	LWX	Baltimore, Harford	3 hr

Nearby

Winter Storm Warnings in Virginia, 2015 Winter Storm Warnings in Maryland, 2015 Winter Storm Warnings in West Virginia, 2015 Every winter storm warning in 2015

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.