Alert archive / West Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Charleston, WV

May 4, 20215 counties in West Virginia; Washington County, Ohio

NWS Charleston, WV issued this flash flood warning at May 4, 2021, 11:01 AM EDT for 5 counties in West Virginia; Washington County, Ohio. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 4, 2021, 11:01 AM EDT (15:01 UTC)
Expired: May 4, 2021, 2:00 PM EDT
In force: 3 hr
Issued by: NWS Charleston, WV
Area: Storm-based polygon
Flood severity: None

Counties Washington County, OH, Pleasants County, WV, Ritchie County, WV, Tyler County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 139 km from the middle of the area, began a volume at 15:04 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.

What was reported inside it

Time	Report	Where	Remark
May 4, 12:00 PM EDT	FLASH FLOOD	Pennsboro, WV	FLOODING OBSERVED IN TOWN OF PENNSBORO, PARTICULARLY ALONG 74 SOUTH, WHERE MORE THAN A FOOT OF WATER IS COVERING THE ROADWAY
May 4, 12:34 PM EDT	HEAVY RAIN 1.41	Pennsboro, WV	PRIVATE WEATHER STATION MEASUREMENT IN PENNSBORO. 3 HOUR ACCUMULATION

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 3.0 hours before the alert went out and 139 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: 662 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

894 
WGUS51 KRLX 041501
FFWRLX
OHC167-WVC073-085-095-105-107-041800-
/O.NEW.KRLX.FF.W.0007.210504T1501Z-210504T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Charleston WV
1101 AM EDT Tue May 4 2021

The National Weather Service in Charleston has issued a

* Flash Flood Warning for...
  Washington County in southeastern Ohio...
  Tyler County in northern West Virginia...
  Pleasants County in northwestern West Virginia...
  Central Ritchie County in northwestern West Virginia...
  Northwestern Wirt County in northwestern West Virginia...
  Wood County in northwestern West Virginia...

* Until 200 PM EDT.

* At 1101 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  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...
  Parkersburg, Marietta, Belpre, Harrisville, St. Marys, Beverly, 
  Middlebourne, Vienna, Williamstown, Paden City, Sistersville, 
  Pennsboro, Belmont, Boaz, North Bend State Park, Mineralwells, 
  Lubeck, Washington, Newport and Matamoras.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

Please report Severe Weather to the National Weather Service by 
calling toll free, 800 401 9535, when you can do so safely. You may 
also report severe weather by posting your report to the Charleston 
West Virginia National Weather Service Facebook Page, or by using 
the Twitter Hashtag, NWSRLX.

&&

LAT...LON 3957 8165 3959 8162 3958 8147 3965 8147
      3959 8136 3961 8126 3958 8126 3957 8104
      3954 8104 3961 8095 3958 8089 3960 8085
      3955 8082 3955 8078 3945 8067 3934 8085
      3918 8102 3903 8160 3911 8174

FLASH FLOOD...RADAR INDICATED

$$

SL

1 follow-up statement

743 
WGUS71 KRLX 041612
FFSRLX

Flash Flood Statement
National Weather Service Charleston WV
1212 PM EDT Tue May 4 2021

OHC167-WVC073-085-095-105-107-041800-
/O.CON.KRLX.FF.W.0007.000000T0000Z-210504T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington OH-Pleasants WV-Ritchie WV-Tyler WV-Wirt WV-Wood WV-
1212 PM EDT Tue May 4 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 PM EDT THIS 
AFTERNOON FOR WASHINGTON, TYLER, PLEASANTS, CENTRAL RITCHIE, 
NORTHWESTERN WIRT AND WOOD COUNTIES...

At 1212 PM EDT, emergency management reported flooding from 
thunderstorms, particularly in the town of Pennsboro in Ritchie 
county. Flooding has also been reported in Dodridge county. Between 
1 and 1.5 inches of rain have fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management reported.

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...
  Parkersburg, Marietta, Belpre, Harrisville, St. Marys, Beverly, 
  Middlebourne, Vienna, Williamstown, Paden City, Sistersville, 
  Pennsboro, Belmont, Boaz, North Bend State Park, Mineralwells, 
  Lubeck, Washington, Newport and Matamoras.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

Please report Severe Weather to the National Weather Service by 
calling toll free, 800 401 9535, when you can do so safely. You may 
also report severe weather by posting your report to the Charleston 
West Virginia National Weather Service Facebook Page, or by using 
the Twitter Hashtag, NWSRLX.

&&

LAT...LON 3957 8165 3959 8162 3958 8147 3965 8147
      3959 8136 3961 8126 3958 8126 3957 8104
      3954 8104 3961 8095 3958 8089 3960 8085
      3955 8082 3955 8078 3945 8067 3934 8085
      3918 8102 3903 8160 3911 8174

FLASH FLOOD...OBSERVED

$$

SL

The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 4, 11:59 AM EDT	Flash Flood Warning	RLX	Doddridge, Harrison, Ritchie, Tyler	5 hr
May 4, 2:06 PM EDT	Areal Flood Warning	RLX	Ritchie, Tyler	3 hr
May 4, 2:35 PM EDT	Flash Flood Watch	RLX	Braxton, Calhoun, Clay, Doddridge, Gilmer, Harrison and 11 more	17 hr
May 4, 7:31 AM EDT	Special Weather Statement	RLX	Morgan	44 min

Nearby

Flash Flood Warnings in West Virginia, 2021 Flash Flood Warnings in Ohio, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.