Alert archive / Ohio / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS Wilmington, OH

July 29, 20215 counties in Ohio

NWS Wilmington, OH issued this flash flood warning at Jul 29, 2021, 9:10 PM EDT for 5 counties in Ohio. It was in force for 4 hr. 1 report 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: Jul 29, 2021, 9:10 PM EDT (01:10 UTC)
Expired: Jul 30, 2021, 1:09 AM EDT
In force: 4 hr
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Adams County, OH, Highland County, OH, Pike County, OH, Ross County, OH, Scioto County, OH

The radar

The Cincinnati radar (KILN), 101 km from the middle of the area, began a volume at 01:13 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
Jul 29, 11:10 PM EDT	FLASH FLOOD	Idaho, OH	ROADS REMAIN CLOSED DUE TO FLASH FLOODING.

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

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.2 hours before the alert went out and 100 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: 2113 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

As transmitted.

767 
WGUS51 KILN 300110
FFWILN
OHC001-071-131-141-145-300515-
/O.NEW.KILN.FF.W.0024.210730T0110Z-210730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wilmington OH
910 PM EDT Thu Jul 29 2021

The National Weather Service in Wilmington has issued a

* Flash Flood Warning for...
  Northeastern Adams County in southwestern Ohio...
  Eastern Highland County in southwestern Ohio...
  Pike County in southwestern Ohio...
  Southwestern Ross County in southwestern Ohio...
  Scioto County in southwestern Ohio...

* Until 115 AM EDT.

* At 910 PM EDT, local law enforcement reported flash flooding in 
  Waverly.  Water rescues are ongoing.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Law enforcement reported.

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

* Some locations that may experience flash flooding include...
  Portsmouth, Hillsboro, Waverly, Wheelersburg, New Boston, Piketon, 
  Greenup, Marshall, Bainbridge, Pike Lake, Kincaid Springs, 
  Lucasville, Clarktown, Rosemount, Cynthiana, Sciotodale, Highland 
  Holiday, Rocky Fork Point, Franklin Furnace and Rarden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

To report flash flooding, go to our website at weather.gov/iln and 
submit your report via social media, when you can do so safely.

&&

LAT...LON 3921 8360 3933 8343 3918 8294 3894 8285
      3869 8270 3868 8271 3868 8276 3864 8277
      3860 8274 3857 8282 3859 8284 3866 8286
      3869 8288 3874 8287 3876 8289 3873 8298
      3873 8303 3869 8307

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Novak

2 follow-up statements

163 
WGUS71 KILN 300249
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
1049 PM EDT Thu Jul 29 2021

OHC001-071-131-141-145-300515-
/O.CON.KILN.FF.W.0024.000000T0000Z-210730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Adams OH-Highland OH-Pike OH-Ross OH-Scioto OH-
1049 PM EDT Thu Jul 29 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 AM EDT FRIDAY FOR 
NORTHEASTERN ADAMS, EASTERN HIGHLAND, PIKE, SOUTHWESTERN ROSS AND 
SCIOTO COUNTIES...

At 1049 PM EDT, local law enforcement reported flash flooding.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Law enforcement reported.

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

Some locations that may experience flash flooding include...
  Portsmouth, Hillsboro, Waverly, Wheelersburg, New Boston, Piketon, 
  Greenup, Marshall, Bainbridge, Pike Lake, Kincaid Springs, 
  Lucasville, Clarktown, Rosemount, Cynthiana, Sciotodale, Highland 
  Holiday, Rocky Fork Point, Franklin Furnace and Rarden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

To report flash flooding, go to our website at weather.gov/iln and 
submit your report via social media, when you can do so safely.

&&

LAT...LON 3921 8360 3933 8343 3918 8294 3894 8285
      3869 8270 3868 8271 3868 8276 3864 8277
      3860 8274 3857 8282 3859 8284 3866 8286
      3869 8288 3874 8287 3876 8289 3873 8298
      3873 8303 3869 8307

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Novak

746 
WGUS71 KILN 300509
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
109 AM EDT Fri Jul 30 2021

OHC001-071-131-141-145-300519-
/O.CAN.KILN.FF.W.0024.000000T0000Z-210730T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Adams OH-Highland OH-Pike OH-Ross OH-Scioto OH-
109 AM EDT Fri Jul 30 2021

...FLASH FLOOD WARNING FOR NORTHEASTERN ADAMS, EASTERN HIGHLAND, 
PIKE, SOUTHWESTERN ROSS AND SCIOTO COUNTIES HAS BEEN REPLACED WITH A 
FLOOD WARNING...

The heavy rain has ended. Please continue to heed remaining road 
closures.

LAT...LON 3921 8360 3933 8343 3918 8294 3894 8285
      3869 8270 3868 8271 3868 8276 3864 8277
      3860 8274 3857 8282 3859 8284 3866 8286
      3869 8288 3874 8287 3876 8289 3873 8298
      3873 8303 3869 8307

$$

Coniglio

The office that day

Everything else NWS Wilmington, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 8:04 PM EDT	Severe Thunderstorm Warning	ILN	Adams, Scioto	41 min
Jul 29, 8:11 PM EDT	Flash Flood Warning	ILN	Adams, Highland, Pike, Ross, Scioto	4 hr
Jul 29, 8:36 PM EDT	Severe Thunderstorm Warning	ILN	Adams, Scioto	28 min
Jul 29, 8:45 PM EDT	Areal Flood Advisory	ILN	Adams, Brown, Scioto	3 hr
Jul 29, 9:29 PM EDT	Flash Flood Warning	ILN	Adams, Brown, Scioto	4 hr
Jul 29, 9:47 PM EDT	Areal Flood Advisory	ILN	Brown, Clermont	3 hr
Jul 30, 1:09 AM EDT	Areal Flood Warning	ILN	Pike, Scioto	7 hr
Jul 30, 1:18 AM EDT	Areal Flood Warning	ILN	Adams, Brown, Scioto	7 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.