Alert archive / Maryland / Flash Flood Warnings in 2021

Flash Flood Warning 32, NWS Wakefield, VA

July 9, 2021Dorchester County, Maryland

NWS Wakefield, VA issued this flash flood warning at Jul 9, 2021, 12:25 AM EDT for Dorchester 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 outline as issued.

The facts

Issued: Jul 9, 2021, 12:25 AM EDT (04:25 UTC)
Expired: Jul 9, 2021, 3:30 AM EDT
In force: 3 hr
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

County Dorchester County, MD

The radar

The Dover AFB radar (KDOX), 73 km from the middle of the area, began a volume at 04:28 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, 4.4 hours before the alert went out and 82 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: 440 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

631 
WGUS51 KAKQ 090425
FFWAKQ
MDC019-090730-
/O.NEW.KAKQ.FF.W.0032.210709T0425Z-210709T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
1225 AM EDT Fri Jul 9 2021

The National Weather Service in Wakefield has issued a

* Flash Flood Warning for...
  Dorchester County in southeastern Maryland...

* Until 330 AM EDT.

* At 1225 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 1.5 and 2.5 inches of rain have fallen. 
  Additional rainfall amounts of 1 to 2 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Cambridge, Hurlock, Sharptown, Secretary, Vienna, University Of 
  Maryland Center For Environmental Studies, East New Market, 
  Galestown, Church Creek, Brookview, Eldorado, Bucktown, Linkwood, 
  Andrews, Woolford, Elliott, Madison, Honga and Taylors Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding. Do not stay in areas subject to flooding when 
water begins rising.

&&

LAT...LON 3849 7634 3851 7621 3853 7628 3860 7614
      3857 7602 3870 7590 3864 7571 3855 7571
      3834 7596 3837 7601 3831 7599 3825 7607
      3830 7611 3827 7617 3823 7613 3823 7614
      3837 7628 3831 7624 3832 7626

FLASH FLOOD...RADAR INDICATED

$$

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 11:37 PM EDT	Areal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico	3 hr
Jul 8, 11:48 PM EDT	Tornado Warning	AKQ	Wicomico, Worcester	27 min
Jul 9, 12:02 AM EDT	Areal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico, Worcester	3 hr
Jul 9, 12:04 AM EDT	Tornado Warning	AKQ	Worcester	26 min
Jul 9, 12:05 AM EDT	Tornado Warning	AKQ	Wicomico	25 min
Jul 9, 6:25 PM EDT	Special Weather Statement	AKQ	Dorchester	50 min
Jul 9, 7:07 PM EDT	Special Weather Statement	AKQ	Dorchester	38 min

Nearby

Flash Flood Warnings in Maryland, 2021 Every flash flood warning in 2021

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.