Alert archive / Maryland / Flash Flood Warnings in 2018

Flash Flood Warning 37, NWS Wakefield, VA

October 12, 2018Wicomico County, Worcester County, Maryland

NWS Wakefield, VA issued this flash flood warning at Oct 12, 2018, 12:39 AM EDT for Wicomico County, Worcester County, Maryland. It was in force for 9 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: Oct 12, 2018, 12:39 AM EDT (04:39 UTC)
Expired: Oct 12, 2018, 9:45 AM EDT
In force: 9 hr
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

Counties Wicomico County, MD, Worcester County, MD

The radar

The Dover AFB radar (KDOX), 59 km from the middle of the area, began a volume at 04:40 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.7 hours before the alert went out and 41 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: 959 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.3

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Wakefield, VA wrote its last area forecast discussion before this flash flood warning went out at Oct 11, 11:02 PM EDT, 1 hour 37 minutes earlier.

Area forecast discussion, Oct 11, 11:02 PM EDT, 1 hour 37 minutes before

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Hazardous weather outlook, Oct 11, 11:46 PM EDT, 53 minutes before

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In the hours before

Local storm report, Oct 11, 11:49 PM EDT, 50 minutes before

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Local storm report, Oct 11, 11:51 PM EDT, 48 minutes before

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Local storm report, Oct 12, 12:00 AM EDT, 39 minutes before

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Local storm report, Oct 12, 12:18 AM EDT, 21 minutes before

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Local storm report, Oct 12, 12:25 AM EDT, 14 minutes before

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Local storm report, Oct 12, 12:29 AM EDT, 10 minutes before

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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 11, 8:12 PM EDT	Flash Flood Warning	AKQ	Charles City, Essex, Gloucester, James City, King and Queen, King William and 9 more	6 hr
Oct 11, 8:21 PM EDT	Flash Flood Warning	AKQ	Chesterfield, Dinwiddie, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg	3 hr
Oct 11, 8:22 PM EDT	Flash Flood Warning	AKQ	Essex, Lancaster, Middlesex, Northumberland, Richmond, Westmoreland	6 hr
Oct 11, 9:49 PM EDT	Coastal Flood Advisory	AKQ	Northumberland, Westmoreland	110 min
Oct 11, 9:50 PM EDT	River Flood Warning	AKQ	Buckingham, Fluvanna	47 hr
Oct 11, 9:50 PM EDT	River Flood Warning	AKQ	Henrico, City of Richmond	66 hr
Oct 11, 9:50 PM EDT	River Flood Warning	AKQ	Chesterfield, Henrico, City of Richmond	67 hr
Oct 11, 9:50 PM EDT	River Flood Warning	AKQ	Fluvanna	31 hr
Oct 11, 9:52 PM EDT	Flash Flood Warning Emergency	AKQ	Essex, King and Queen, King William, Lancaster, Middlesex, Northumberland and 2 more	6 hr
Oct 11, 10:38 PM EDT	Areal Flood Warning	AKQ	Amelia, Cumberland, Goochland, Lunenburg, Mecklenburg, Nottoway and 2 more	12 hr
Oct 11, 11:09 PM EDT	Areal Flood Warning	AKQ	Cumberland, Fluvanna, Goochland, Hanover, Louisa	12 hr
Oct 11, 11:25 PM EDT	Areal Flood Warning	AKQ	Chesterfield, Dinwiddie, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg	6 hr
Oct 11, 11:39 PM EDT	Coastal Flood Warning	AKQ	Accomack, Gloucester, Lancaster, Mathews, Middlesex, Northampton and 2 more	5 hr
Oct 11, 11:39 PM EDT	Areal Flood Warning	AKQ	Amelia, Chesterfield, Dinwiddie, Henrico, City of Richmond	9 hr
Oct 12, 12:33 AM EDT	Areal Flood Warning	AKQ	Caroline, Hanover	9 hr
Oct 12, 1:46 AM EDT	Areal Flood Warning	AKQ	Charles City, Chesterfield, Essex, Gloucester, Hanover, Henrico and 13 more	9 hr
Oct 12, 4:02 AM EDT	Gale Warning	AKQ		6 hr
Oct 12, 6:58 AM EDT	Gale Watch	AKQ		12 min
Oct 12, 7:10 AM EDT	Small Craft Advisory	AKQ		3 hr
Oct 12, 9:40 AM EDT	River Flood Warning	AKQ	Greensville, Southampton, City of Emporia	3 days
Oct 12, 10:16 AM EDT	Small Craft Advisory	AKQ		12 hr
Oct 12, 12:14 PM EDT	Coastal Flood Advisory	AKQ	Gloucester, Mathews	3 hr
Oct 11, 10:57 PM EDT	Flash Flood Warning	AKQ	Dorchester, Somerset, Wicomico	6 hr
Oct 11, 11:39 PM EDT	Coastal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico	5 hr
Oct 12, 4:53 AM EDT	Areal Flood Warning	AKQ	Dorchester, Somerset, Wicomico	6 hr
Oct 12, 9:44 AM EDT	Areal Flood Warning	AKQ	Wicomico, Worcester	6 hr

Nearby

Flash Flood Warnings in Maryland, 2018 Every flash 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.