Alert archive / Maryland / Wind Advisories in 2020

Wind Advisory 12, NWS Baltimore/Washington

October 29, 2020Calvert County, Saint Mary's County, Maryland

NWS Baltimore/Washington issued this wind advisory at Oct 29, 2020, 8:50 AM EDT for Calvert County, Saint Mary's County, Maryland. It took effect at Oct 29, 2020, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Oct 29, 2020, 8:50 AM EDT (12:50 UTC)
In effect from
Oct 29, 2020, 12:00 PM EDT
Expired
Oct 29, 2020, 7:49 PM EDT
In force
8 hr
Issued by
NWS Baltimore/Washington

Counties Calvert County, MD, Saint Mary's County, MD

The radar

The Sterling radar (KLWX), 107 km from the middle of the area, began a volume at 12:52 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

Roanoke, VA (KRNK), launched 12:00Z, 0.8 hours before the alert went out and 292 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, Roanoke, VA at 12:00Z on 2020-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 171 joules per kilogram.LCLLFCEL10008507005003002001001 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, Roanoke, VA at 12:00Z on 2020-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 280 square meters per square second.1939587897Sfc1 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
171 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
507 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
280 m²/s²
0-3 km storm-relative helicity
452 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 29, 1:12 AM EDTSmall Craft AdvisoryLWX29 hr
Oct 29, 3:24 AM EDTFreeze WatchLWXLoudoun13 hr
Oct 29, 9:41 AM EDTAreal Flood WarningLWXFairfax, City of Fairfax11 hr
Oct 29, 11:30 AM EDTAreal Flood WarningLWXArlington, Fairfax, City of Alexandria, City of Falls Church6 hr
Oct 29, 1:00 PM EDTAreal Flood WarningLWXCulpeper, Fairfax, Fauquier, Madison, Orange, Prince William and 3 more8 hr
Oct 29, 3:22 PM EDTAreal Flood WarningLWXAlbemarle, Greene, Madison, Orange, City of Charlottesville6 hr
Oct 29, 4:14 PM EDTFreeze WarningLWXClarke, Culpeper, Fauquier, Greene, Loudoun, Madison and 7 more41 hr
Oct 29, 6:46 PM EDTGale WarningLWX18 hr
Oct 29, 6:46 PM EDTSmall Craft AdvisoryLWX41 hr
Oct 29, 3:16 PM EDTAreal Flood WarningLWXSaint Mary's12 hr
Oct 29, 4:37 PM EDTAreal Flood WarningLWXPrince George's27 hr
Oct 29, 7:03 PM EDTAreal Flood WarningLWXCharles, Prince George's31 hr

Nearby

Wind Advisories in Maryland, 2020Every wind advisory in 2020

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.