Alert archive / Virginia / Winter Storm Warnings in 2017
Winter Storm Warning 4, NWS Baltimore/Washington
NWS Baltimore/Washington issued this winter storm warning at Dec 8, 2017, 2:52 PM EST for 4 counties in Virginia; Calvert County, Charles County, Saint Mary's County, Maryland. It took effect at Dec 8, 2017, 7:00 PM EST. It was in force for 21 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
- Dec 8, 2017, 2:52 PM EST (19:52 UTC)
- In effect from
- Dec 8, 2017, 7:00 PM EST
- Expired
- Dec 9, 2017, 4:08 PM EST
- In force
- 21 hr
- Issued by
- NWS Baltimore/Washington
Counties Calvert County, MD, Charles County, MD, Saint Mary's County, MD, City of Fredericksburg, VA, King George County, VA, Spotsylvania County, VA, Stafford County, VA
The radar
The Sterling radar (KLWX), 77 km from the middle of the area, began a volume at 19:49 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, 7.9 hours before the alert went out and 72 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1723 m above ground
- 0-6 km bulk shear
- 96 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Dec 8, 10:07 AM EST, 4 hours 45 minutes earlier.
Area forecast discussion, Dec 8, 10:07 AM EST, 4 hours 45 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 7, 8:24 PM EST | Small Craft Advisory | LWX | 7 hr | |
| Dec 8, 5:50 AM EST | Winter Weather Advisory | LWX | Albemarle, Amherst, Arlington, Augusta, Culpeper, Fairfax and 23 more | 51 hr |
| Dec 8, 11:10 AM EST | Small Craft Advisory | LWX | 67 hr | |
| Dec 8, 11:10 AM EST | Small Craft Advisory | LWX | 53 hr |
Nearby
Winter Storm Warnings in Virginia, 2017Winter Storm Warnings in Maryland, 2017Every winter storm warning in 2017
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.