Alert archive / West Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 22, NWS Baltimore/Washington

July 7, 2021Pendleton County, West Virginia

NWS Baltimore/Washington issued this flash flood warning at Jul 7, 2021, 4:42 PM EDT for Pendleton County, West Virginia. It was in force for 88 min. 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 7, 2021, 4:42 PM EDT (20:42 UTC)
Expired: Jul 7, 2021, 6:10 PM EDT
In force: 88 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pendleton County, WV

The radar

The Sterling radar (KLWX), 171 km from the middle of the area, began a volume at 20:45 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 12:00Z, 8.7 hours before the alert went out and 179 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: 1114 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1273 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

244 
WGUS51 KLWX 072042
FFWLWX
WVC071-072345-
/O.NEW.KLWX.FF.W.0022.210707T2042Z-210707T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
442 PM EDT Wed Jul 7 2021

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Northwestern Pendleton County in eastern West Virginia...

* Until 745 PM EDT.

* At 442 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 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...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Onego...                           Seneca Rocks...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3895 7936 3888 7930 3876 7942 3876 7953
      3879 7951 3880 7951 3882 7953 3883 7952
      3884 7954 3887 7951 3889 7952 3889 7951
      3889 7948 3890 7945 3892 7946 3893 7945
      3892 7937

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

BKF

1 follow-up statement

224 
WGUS71 KLWX 072210
FFSLWX

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
610 PM EDT Wed Jul 7 2021

WVC071-072220-
/O.CAN.KLWX.FF.W.0022.000000T0000Z-210707T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pendleton WV-
610 PM EDT Wed Jul 7 2021

...FLASH FLOOD WARNING FOR NORTHWESTERN PENDLETON COUNTY HAS BEEN 
REPLACED WITH A FLOOD WARNING...

LAT...LON 3895 7936 3888 7930 3876 7942 3876 7953
      3879 7951 3880 7951 3882 7953 3883 7952
      3884 7954 3887 7951 3889 7952 3889 7951
      3889 7948 3890 7945 3892 7946 3893 7945
      3892 7937

$$

BKF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 4:09 PM EDT	Severe Thunderstorm Warning	LWX	Berkeley, Morgan	26 min
Jul 7, 4:13 PM EDT	Severe Thunderstorm Warning	LWX	Hardy	47 min
Jul 7, 5:24 PM EDT	Severe Thunderstorm Warning	LWX	Pendleton	29 min
Jul 7, 5:34 PM EDT	Severe Thunderstorm Warning	LWX	Hampshire, Hardy	28 min
Jul 7, 6:10 PM EDT	Areal Flood Warning	LWX	Pendleton	60 min
Jul 7, 7:27 PM EDT	Severe Thunderstorm Warning	LWX	Berkeley, Morgan	33 min

Nearby

Flash Flood Warnings in West Virginia, 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.