Alert archive / Ohio / Flash Flood Warnings in 2021

Flash Flood Warning 91, NWS Charleston, WV

August 18, 2021Athens County, Morgan County, Perry County, Ohio

NWS Charleston, WV issued this flash flood warning at Aug 18, 2021, 6:30 AM EDT for Athens County, Morgan County, Perry County, Ohio. It was in force for 6 hr. 3 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: Aug 18, 2021, 6:30 AM EDT (10:30 UTC)
Expired: Aug 18, 2021, 12:30 PM EDT
In force: 6 hr
Issued by: NWS Charleston, WV
Area: Storm-based polygon
Flood severity: None

Counties Athens County, OH, Morgan County, OH, Perry County, OH

The radar

The Charleston,WV radar (KRLX), 138 km from the middle of the area, began a volume at 10:31 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
Aug 18, 7:22 AM EDT	FLASH FLOOD	4 W Chauncey, OH	FLOODING REPORTED ALONG STATE ROUTE 691.
Aug 18, 7:48 AM EDT	FLASH FLOOD	1 N The Plains, OH	FLOODING REPORTED ALONG STATE ROUTE 682 IN THE PLAINS.
Aug 18, 7:50 AM EDT	FLASH FLOOD	1 Nne Glouster, OH	FLOODING WAS REPORTED ALONG STATE ROUTE 13 NORTH OF GLOUSTER.

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 00:00Z, 10.5 hours before the alert went out and 200 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: 372 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

640 
WGUS51 KRLX 181030
FFWRLX
OHC009-115-127-181630-
/O.NEW.KRLX.FF.W.0091.210818T1030Z-210818T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Charleston WV
630 AM EDT Wed Aug 18 2021

The National Weather Service in Charleston has issued a

* Flash Flood Warning for...
  Northern Athens County in southeastern Ohio...
  Southwestern Morgan County in southeastern Ohio...
  Southeastern Perry County in southeastern Ohio...

* Until 1230 PM EDT.

* At 630 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 3 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by repetitive numerous showers.

  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...
  Nelsonville, Glouster, Chesterhill, Chauncey, Corning, Buchtel, 
  Jacksonville, Trimble, Hemlock, Amesville, Rendville, Burr Oak 
  State Park and The Plains.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3956 8222 3963 8216 3967 8208 3960 8189
      3940 8185 3933 8189 3940 8229 3947 8228
      3947 8225 3947 8224 3947 8217 3956 8216

FLASH FLOOD...RADAR INDICATED

$$

ARJ

1 follow-up statement

967 
WGUS71 KRLX 181633
FFSRLX

Flash Flood Statement
National Weather Service Charleston WV
1233 PM EDT Wed Aug 18 2021

OHC009-115-127-181643-
/O.EXP.KRLX.FF.W.0091.000000T0000Z-210818T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Athens OH-Morgan OH-Perry OH-
1233 PM EDT Wed Aug 18 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHERN ATHENS, SOUTHWESTERN 
MORGAN AND SOUTHEASTERN PERRY COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3956 8222 3963 8216 3967 8208 3960 8189
      3940 8185 3933 8189 3940 8229 3947 8228
      3947 8225 3947 8224 3947 8217 3956 8216

$$

MEK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 3:55 AM EDT	Flash Flood Warning	RLX	Gallia, Lawrence	6 hr
Aug 18, 4:48 AM EDT	Flash Flood Warning	RLX	Athens, Gallia, Jackson, Meigs, Vinton	6 hr
Aug 18, 8:02 AM EDT	Flash Flood Warning	RLX	Morgan, Perry	4 hr

Nearby

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.