Alert archive / Maryland / Flash Flood Warnings in 2020

Flash Flood Warning 34, NWS Wakefield, VA

August 8, 2020Somerset County, Wicomico County, Worcester County, Maryland

NWS Wakefield, VA issued this flash flood warning at Aug 8, 2020, 12:49 AM EDT for Somerset County, Wicomico County, Worcester County, Maryland. It was in force for 3 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: Aug 8, 2020, 12:49 AM EDT (04:49 UTC)
Expired: Aug 8, 2020, 4:00 AM EDT
In force: 3 hr
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

Counties Somerset County, MD, Wicomico County, MD, Worcester County, MD

The radar

The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 04:50 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, 4.8 hours before the alert went out and 37 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: 609 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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 Aug 7, 10:03 PM EDT, 2 hours 46 minutes earlier.

Area forecast discussion, Aug 7, 10:03 PM EDT, 2 hours 46 minutes before

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Hazardous weather outlook, Aug 7, 9:58 PM EDT, 2 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Wakefield VA
958 PM EDT Fri Aug 7 2020

MDZ021>025-NCZ012>017-030>032-102-VAZ048-060>062-064>069-075>090-092-
093-095>100-509>525-090200-
Dorchester-Wicomico-Somerset-Inland Worcester-Maryland Beaches-
Northampton-Hertford-Gates-Pasquotank-Camden-Western Currituck-
Bertie-Chowan-Perquimans-Eastern Currituck-Fluvanna-Prince Edward-
Cumberland-Goochland-Caroline-Mecklenburg-Lunenburg-Nottoway-Amelia-
Powhatan-Westmoreland-Richmond-Northumberland-Lancaster-Brunswick-
Dinwiddie-Prince George-Charles City-New Kent-Gloucester-Middlesex-
Mathews-Greensville-Sussex-Surry-James City-Southampton-
Isle of Wight-Norfolk/Portsmouth-Suffolk-Chesapeake-Virginia Beach-
Accomack-Western Louisa-Eastern Louisa-Western Hanover-
Eastern Hanover-Western Chesterfield-
Eastern Chesterfield (Including Col. Heights)-
Western Henrico (Including the City of Richmond)-Eastern Henrico-
Western King William-Eastern King William-Western King and Queen-
Eastern King and Queen-Western Essex-Eastern Essex-York-Newport News-
Hampton/Poquoson-
958 PM EDT Fri Aug 7 2020

This Hazardous Weather Outlook is for southeast Maryland, northeast
North Carolina, central Virginia, east central Virginia, eastern
Virginia, north central Virginia, south central Virginia and
southeast Virginia.

.DAY ONE...Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Additional showers and thunderstorms are expected Saturday into
Saturday night with localized heavy rainfall possible. There will
remain a threat for flooding of urban and poor drainage areas.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 7, 7:48 PM EDT, 5 hours 1 minute before

Special Weather Statement
National Weather Service Wakefield VA
748 PM EDT Fri Aug 7 2020

VAZ079-080030-
Brunswick-
748 PM EDT Fri Aug 7 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN BRUNSWICK COUNTY...

At 747 PM EDT, a strong thunderstorm was located near Lawrenceville,
moving northwest at 5 mph.

Wind gusts in excess of 30 mph are possible with this storm.

Rainfall amounts of up to 1 inch are possible with this storm.

Locations impacted include...
Lawrenceville, Alberta, Cochran, Callaville, Edgerton, Dolphin,
Warfield and Prices Mill.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 3689 7798 3694 7773 3692 7771 3692 7772
      3691 7771 3692 7770 3690 7768 3689 7766
      3675 7766 3669 7783
TIME...MOT...LOC 2347Z 151DEG 6KT 3679 7778

Poche

Special weather statement, Aug 7, 10:27 PM EDT, 2 hours 22 minutes before

Special Weather Statement
National Weather Service Wakefield VA
1027 PM EDT Fri Aug 7 2020

MDZ021-022-080315-
Dorchester-Wicomico-
1027 PM EDT Fri Aug 7 2020

...A THUNDERSTORM WITH HEAVY RAIN WILL AFFECT NORTHWESTERN WICOMICO
AND DORCHESTER COUNTIES...

At 1027 PM EDT, a thunderstorm with heavy rain was located near
Vienna, or 10 miles southeast of Cambridge, moving northeast at 10
mph.

Rainfall amounts of 1 to 2 inches are possible with this storm.

Locations impacted include...
Cambridge, Hurlock, Sharptown, Secretary, Vienna, East New Market,
Mardela Springs, Galestown, Church Creek, Brookview, Eldorado,
Woolford, Bucktown, Linkwood and Madison.

Motorists should use extra caution in the vicinity of this storm. Be
prepared for rapid changes in weather and road conditions. Heavy rain
could cause ponding of water on roads, and possible minor flooding of
ditches and poor drainage areas.

LAT...LON 3868 7580 3869 7576 3864 7571 3846 7569
      3846 7564 3837 7599 3837 7601 3836 7602
      3835 7606 3849 7628 3851 7621 3852 7621
      3858 7606 3857 7603 3859 7599 3862 7598
      3869 7580
TIME...MOT...LOC 0227Z 236DEG 11KT 3846 7593

JM

Special weather statement, Aug 7, 11:01 PM EDT, 1 hour 48 minutes before

Special Weather Statement
National Weather Service Wakefield VA
1101 PM EDT Fri Aug 7 2020

MDZ022-024-080345-
Wicomico-Inland Worcester-
1101 PM EDT Fri Aug 7 2020

...A LINE OF THUNDERSTORMS WITH HEAVY RAIN WILL AFFECT WICOMICO AND
NORTH CENTRAL WORCESTER COUNTIES...

At 1101 PM EDT, thunderstorms with heavy rain were located along a
line extending from near Delmar to 9 miles south of Vienna. Movement
was east at 20 mph.

Wind gusts in excess of 30 mph are possible with these storms.

Rainfall amounts of 1 to 2 inches are possible with these storms.

Locations impacted include...
Salisbury, Fruitland, Salisbury University, Delmar, Hebron,
Parsonsburg, Pittsville, Willards, Green Hill, Catchpenny, Wetipquin,
Salisbury-Wicomico, Royal Oak, Lakewood, Chesapeake Heights,
Powellville, Whaleyville, Melson, Shad Point and Allen.

Motorists should use extra caution in the vicinity of these storms.
Be prepared for rapid changes in weather and road conditions. Heavy
rain could cause ponding of water on roads, and possible minor
flooding of ditches and poor drainage areas.

LAT...LON 3829 7538 3828 7561 3830 7566 3829 7569
      3832 7589 3836 7586 3838 7587 3839 7584
      3840 7585 3846 7568 3845 7520
TIME...MOT...LOC 0301Z 280DEG 19KT 3844 7563 3836 7589

JM

Special weather statement, Aug 7, 11:46 PM EDT, 1 hour 3 minutes before

Special Weather Statement
National Weather Service Wakefield VA
1146 PM EDT Fri Aug 7 2020

MDZ022>025-VAZ099-080430-
Wicomico-Maryland Beaches-Somerset-Inland Worcester-Accomack-
1146 PM EDT Fri Aug 7 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOMERSET...WICOMICO...
WORCESTER AND NORTHERN ACCOMACK COUNTIES...

At 1146 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Gumboro to near Tylerton. Movement
was east at 30 to 35 mph.

Wind gusts in excess of 30 mph are possible with these storms.

Rainfall amounts of 1 to 2 inches are possible with these storms.

Locations impacted include...
Salisbury, Fruitland, Pocomoke City, Princess Anne, University Of
Maryland Eastern Shore, Salisbury University, Berlin, Delmar,
Selbyville, Snow Hill, Hebron, Westover, Parsonsburg, Marion Station,
Newark, Tylerton, Lawsonia, Cape Isle Of Wight, Ocean Pines and Deal
Island.

Motorists should use extra caution in the vicinity of these storms.
Be prepared for rapid changes in weather and road conditions. Heavy
rain could cause ponding of water on roads, and possible minor
flooding of ditches and poor drainage areas.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike more than 10 miles away from a thunderstorm.
Seek a safe shelter inside a building or vehicle.

LAT...LON 3810 7514 3784 7533 3783 7583 3785 7577
      3790 7581 3783 7586 3784 7604 3803 7605
      3799 7589 3807 7578 3808 7578 3806 7587
      3814 7579 3815 7593 3807 7602 3851 7570
      3846 7568 3846 7505
TIME...MOT...LOC 0346Z 270DEG 32KT 3848 7544 3795 7596

44

Special weather statement, Aug 8, 12:28 AM EDT, 21 minutes before

Special Weather Statement
National Weather Service Wakefield VA
1228 AM EDT Sat Aug 8 2020

MDZ022-024-025-080500-
Wicomico-Maryland Beaches-Inland Worcester-
1228 AM EDT Sat Aug 8 2020

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN WICOMICO
AND WORCESTER COUNTIES...

At 1228 AM EDT, strong thunderstorms were clustered near Snow Hill,
or 12 miles southeast of Salisbury University, moving east at 35 mph.

Wind gusts in excess of 30 mph are possible with this storm.

Rainfall amounts of up to 1 inch are possible with this storm.

Locations impacted include...
Ocean City, Berlin, Snow Hill, Cape Isle Of Wight, Ocean Pines,
Parsonsburg, Newark, Pittsville, Willards, Bishop, Ocean City
Municipality, Goodwill, Cedartown, Longridge, Powellville, Mount
Wesley, Showell, Whiton, Boxiron and Salisbury-Wicomico.

If you see lightning or hear thunder, you are at risk! Take shelter
indoors immediately. If you cannot find shelter in a building a
vehicle provides safety from lightning.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike more than 10 miles away from a thunderstorm.
Seek a safe shelter inside a building or vehicle.

LAT...LON 3845 7505 3830 7505 3819 7511 3808 7515
      3799 7522 3799 7527 3800 7526 3801 7527
      3799 7529 3800 7539 3801 7538 3802 7538
      3801 7547 3801 7552 3845 7552
TIME...MOT...LOC 0428Z 269DEG 26KT 3825 7540

44

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 1:33 AM EDT	Special Marine Warning	AKQ		72 min
Aug 8, 1:44 AM EDT	Special Marine Warning	AKQ		46 min
Aug 8, 2:07 AM EDT	Special Weather Statement	AKQ	Lancaster, Middlesex, Northumberland	38 min
Aug 8, 2:16 AM EDT	Special Weather Statement	AKQ	Accomack	44 min
Aug 8, 2:31 AM EDT	Areal Flood Advisory	AKQ	Essex, King and Queen, Lancaster, Middlesex, Northumberland, Richmond and 1 more	3 hr
Aug 8, 3:01 AM EDT	Special Marine Warning	AKQ		47 min
Aug 8, 3:13 AM EDT	Special Weather Statement	AKQ	Accomack	32 min
Aug 8, 3:31 AM EDT	Areal Flood Advisory	AKQ	Accomack, Northampton	3 hr
Aug 8, 1:41 PM EDT	Special Weather Statement	AKQ	City of Chesapeake	49 min
Aug 8, 3:03 PM EDT	Special Marine Warning	AKQ		52 min
Aug 8, 4:13 PM EDT	Special Weather Statement	AKQ	Isle of Wight	47 min
Aug 8, 4:21 PM EDT	Special Weather Statement	AKQ	City of Franklin, City of Suffolk	39 min
Aug 8, 4:43 PM EDT	Areal Flood Advisory	AKQ	Isle of Wight, Southampton, Surry, Sussex	3 hr
Aug 8, 4:55 PM EDT	Special Weather Statement	AKQ	City of Franklin	35 min
Aug 8, 5:24 PM EDT	Special Weather Statement	AKQ	Prince George	36 min
Aug 8, 5:35 PM EDT	Special Weather Statement	AKQ	Brunswick, City of Petersburg	40 min
Aug 8, 5:43 PM EDT	Areal Flood Advisory	AKQ	City of Petersburg	2 hr
Aug 8, 5:56 PM EDT	Special Weather Statement	AKQ	Prince George	34 min
Aug 8, 6:11 PM EDT	Areal Flood Advisory	AKQ	Brunswick, Dinwiddie, Greensville, Sussex	3 hr
Aug 8, 6:18 PM EDT	Special Weather Statement	AKQ	Mecklenburg	27 min
Aug 8, 6:22 PM EDT	Special Weather Statement	AKQ	City of Petersburg	38 min
Aug 8, 6:41 PM EDT	Areal Flood Advisory	AKQ	Prince George, City of Hopewell, City of Petersburg	3 hr
Aug 8, 7:19 PM EDT	Special Weather Statement	AKQ	Mecklenburg	41 min
Aug 8, 7:49 PM EDT	Areal Flood Advisory	AKQ	Mecklenburg	3 hr
Aug 8, 2:30 PM EDT	Special Weather Statement	AKQ	Currituck	45 min
Aug 8, 2:32 PM EDT	Special Weather Statement	AKQ	Camden, Currituck	43 min
Aug 8, 3:26 PM EDT	Special Weather Statement	AKQ	Camden, Currituck, Gates, Hertford, Pasquotank	49 min
Aug 8, 4:59 PM EDT	Areal Flood Advisory	AKQ	Chowan, Perquimans	3 hr
Aug 8, 5:30 PM EDT	Special Weather Statement	AKQ	Hertford	30 min
Aug 8, 6:01 PM EDT	Special Weather Statement	AKQ	Hertford	29 min
Aug 7, 10:27 PM EDT	Special Weather Statement	AKQ	Dorchester	48 min
Aug 7, 11:01 PM EDT	Special Weather Statement	AKQ	Wicomico	44 min
Aug 7, 11:22 PM EDT	Areal Flood Advisory	AKQ	Dorchester, Wicomico	3 hr
Aug 7, 11:46 PM EDT	Special Weather Statement	AKQ	Somerset, Wicomico, Worcester	44 min
Aug 8, 12:07 AM EDT	Areal Flood Advisory	AKQ	Wicomico	3 hr
Aug 8, 12:20 AM EDT	Areal Flood Advisory	AKQ	Somerset, Wicomico, Worcester	3 hr
Aug 8, 12:28 AM EDT	Special Weather Statement	AKQ	Worcester	32 min
Aug 8, 1:24 AM EDT	Special Weather Statement	AKQ	Somerset	51 min
Aug 8, 2:24 AM EDT	Flash Flood Warning	AKQ	Somerset	3 hr

Nearby

Flash Flood Warnings in Maryland, 2020 Every flash flood warning 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.