Alert archive / Maryland / Coastal Flood Warnings in 2018

Coastal Flood Warning 21, NWS Baltimore/Washington

December 21, 2018Anne Arundel County, Saint Mary's County, Maryland

NWS Baltimore/Washington issued this coastal flood warning at Dec 21, 2018, 2:17 AM EST for Anne Arundel County, Saint Mary's County, Maryland. It took effect at Dec 21, 2018, 9:00 AM EST. It was in force for 18 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 21, 2018, 2:17 AM EST (07:17 UTC)
In effect from: Dec 21, 2018, 9:00 AM EST
Expired: Dec 22, 2018, 3:03 AM EST
In force: 18 hr
Issued by: NWS Baltimore/Washington

Counties Anne Arundel County, MD, Saint Mary's County, MD

The radar

The Sterling radar (KLWX), 91 km from the middle of the area, began a volume at 07:18 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, 7.3 hours before the alert went out and 83 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: 519 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 429 m²/s²
0-3 km storm-relative helicity: 530 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 coastal flood 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 coastal flood warning went out at Dec 20, 9:54 PM EST, 4 hours 23 minutes earlier.

Area forecast discussion, Dec 20, 9:54 PM EST, 4 hours 23 minutes before

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Hazardous weather outlook, Dec 21, 12:31 AM EST, 1 hour 46 minutes before

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In the hours before

Local storm report, Dec 20, 8:31 PM EST, 5 hours 46 minutes before

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Local storm report, Dec 20, 11:11 PM EST, 3 hours 6 minutes before

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Local storm report, Dec 20, 11:50 PM EST, 2 hours 27 minutes before

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Local storm report, Dec 21, 12:03 AM EST, 2 hours 14 minutes before

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Local storm report, Dec 21, 12:59 AM EST, 1 hour 18 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
Dec 20, 8:27 PM EST	Areal Flood Warning	LWX	Albemarle, Augusta, Nelson, City of Charlottesville, City of Staunton, City of Waynesboro	13 hr
Dec 20, 11:58 PM EST	Areal Flood Warning	LWX	Culpeper, Greene, Madison, Orange, Page, Rappahannock and 2 more	12 hr
Dec 21, 4:07 AM EST	Wind Advisory	LWX	Albemarle, Amherst, Augusta, Greene, Highland, Madison and 9 more	30 hr
Dec 21, 4:09 AM EST	Winter Weather Advisory	LWX	Highland	29 hr
Dec 21, 4:32 AM EST	River Flood Watch	LWX	Warren	13 hr
Dec 21, 4:35 AM EST	River Flood Watch	LWX	Page	6 hr
Dec 21, 4:37 AM EST	River Flood Watch	LWX	Rockingham	6 hr
Dec 21, 11:33 AM EST	Areal Flood Warning	LWX	Augusta, Rockingham	7 hr
Dec 21, 2:38 PM EST	Gale Warning	LWX		19 hr
Dec 21, 3:16 PM EST	Special Marine Warning	LWX		119 min
Dec 21, 4:00 PM EST	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun, Prince William, City of Fairfax, City of Manassas, City of Manassas Park	45 min
Dec 21, 3:37 AM EST	Areal Flood Warning	LWX	Baltimore, Harford	5 hr
Dec 21, 1:48 PM EST	Coastal Flood Advisory	LWX	Anne Arundel, Saint Mary's	13 hr
Dec 21, 3:51 PM EST	Severe Thunderstorm Warning	LWX	Howard, Montgomery	24 min
Dec 21, 4:29 PM EST	Severe Thunderstorm Warning	LWX	Montgomery	46 min
Dec 21, 4:45 PM EST	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Harford	45 min
Dec 21, 5:01 PM EST	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Howard	29 min

Nearby

Coastal Flood Warnings in Maryland, 2018 Every coastal flood warning in 2018

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.