Alert archive / Ohio / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS Wilmington, OH

August 26, 2021Greene County, Montgomery County, Ohio

NWS Wilmington, OH issued this flash flood warning at Aug 26, 2021, 2:59 PM EDT for Greene County, Montgomery County, Ohio. It was in force for 2 hr. 5 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 26, 2021, 2:59 PM EDT (18:59 UTC)
Expired: Aug 26, 2021, 5:01 PM EDT
In force: 2 hr
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Flood severity: None

Counties Greene County, OH, Montgomery County, OH

The radar

The Cincinnati radar (KILN), 51 km from the middle of the area, began a volume at 19:01 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 26, 3:24 PM EDT	FLOOD	Moraine, OH	WATER COVERING NEIGHBORHOOD STREETS
Aug 26, 3:45 PM EDT	HEAVY RAIN 1.18	Farmersville, OH	RAINFALL IN THE PAST HOUR
Aug 26, 3:59 PM EDT	FLOOD	2 Ne Downtown Dayton, OH	15 INCHES OF STANDING WATER ON ROADWAY
Aug 26, 4:15 PM EDT	FLASH FLOOD	Downtown Dayton, OH	SEVERAL MOTORISTS STRANDED IN HIGH WATER REPORTED.
Aug 26, 4:57 PM EDT	HEAVY RAIN 2.4	Moraine, OH

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 12:00Z, 7.0 hours before the alert went out and 51 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: 1291 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: -4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

055 
WGUS51 KILN 261859
FFWILN
OHC057-113-262145-
/O.NEW.KILN.FF.W.0028.210826T1859Z-210826T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wilmington OH
259 PM EDT Thu Aug 26 2021

The National Weather Service in Wilmington has issued a

* Flash Flood Warning for...
  Northwestern Greene County in west central Ohio...
  Montgomery County in west central Ohio...

* Until 545 PM EDT.

* At 259 PM EDT, radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 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 thunderstorms.

  SOURCE...Radar and automated gauges.

  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 may experience flash flooding include...
  Dayton, Kettering, Beavercreek, Huber Heights, Fairborn, Trotwood, 
  Miamisburg, Springboro, Vandalia, Englewood, Franklin, Bellbrook, 
  Moraine, Carlisle, Oakwood, Wright-Patterson Afb, West Carrollton, 
  Riverside, Clayton and Germantown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

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 3974 8448 3986 8430 3988 8405 3985 8405
      3984 8396 3983 8393 3958 8410 3959 8448

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Hickman

3 follow-up statements

382 
WGUS51 KILN 261925
FFWILN
OHC057-113-262200-
/O.EXT.KILN.FF.W.0028.000000T0000Z-210826T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wilmington OH
325 PM EDT Thu Aug 26 2021

The National Weather Service in Wilmington has extended the

* Flash Flood Warning for...
  Northwestern Greene County in west central Ohio...
  Montgomery County in west central Ohio...

* Until 600 PM EDT.

* At 325 PM EDT, radar and automated rain gauges indicated 
  thunderstorms producing heavy rain in Especially along the I75 
  corridor from Dayton to Moraine to West Carrollton. 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 through 430PM. Flash 
  flooding is ongoing or expected to begin shortly.

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

  SOURCE...Radar and automated gauges.

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

* Some locations that may experience flash flooding include...
  Dayton, Kettering, Beavercreek, Huber Heights, Fairborn, Trotwood, 
  Miamisburg, Springboro, Vandalia, Englewood, Franklin, Bellbrook, 
  Moraine, Carlisle, Oakwood, Wright-Patterson Afb, West Carrollton, 
  Riverside, Clayton and Germantown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

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 3974 8448 3986 8430 3988 8405 3985 8405
      3984 8396 3983 8393 3958 8410 3959 8448

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...2 INCHES IN 1 HOUR

$$

JDR

540 
WGUS71 KILN 262033
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
433 PM EDT Thu Aug 26 2021

OHC057-262043-
/O.CAN.KILN.FF.W.0028.000000T0000Z-210826T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Greene OH-
433 PM EDT Thu Aug 26 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN GREENE COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 3974 8448 3986 8430 3988 8405 3984 8406
      3984 8409 3958 8411 3959 8448

$$

OHC113-262200-
/O.CON.KILN.FF.W.0028.000000T0000Z-210826T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery OH-
433 PM EDT Thu Aug 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM EDT THIS EVENING 
FOR MONTGOMERY COUNTY...

At 433 PM EDT, local law enforcement reported flash flooding through 
Dayton, Moraine and Oakwood.

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...
  Dayton, Kettering, Beavercreek, Huber Heights, Trotwood, 
  Miamisburg, Springboro, Vandalia, Englewood, Franklin, Bellbrook, 
  Moraine, Carlisle, Oakwood, West Carrollton, Riverside, Clayton, 
  Germantown and New Lebanon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

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 3974 8448 3986 8430 3988 8405 3984 8406
      3984 8409 3958 8411 3959 8448

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...2 INCHES IN 1 HOUR

$$

JDR

753 
WGUS71 KILN 262101
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
501 PM EDT Thu Aug 26 2021

OHC113-262111-
/O.CAN.KILN.FF.W.0028.000000T0000Z-210826T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Montgomery OH-
501 PM EDT Thu Aug 26 2021

...FLASH FLOOD WARNING IS CANCELLED FOR MONTGOMERY COUNTY...

Fire dispatchers reported that most flood waters have receded. The 
heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3974 8448 3986 8430 3988 8405 3984 8406
      3984 8409 3958 8411 3959 8448

$$

JDR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 9:36 AM EDT	Heat Advisory	ILN	Butler, Clermont, Hamilton, Warren	9 hr
Aug 26, 2:26 PM EDT	Special Weather Statement	ILN	Greene	34 min
Aug 26, 2:30 PM EDT	Special Weather Statement	ILN	Clark	30 min
Aug 26, 2:39 PM EDT	Areal Flood Advisory	ILN	Greene, Montgomery	20 min
Aug 26, 2:41 PM EDT	Special Weather Statement	ILN	Montgomery	34 min
Aug 26, 2:51 PM EDT	Special Weather Statement	ILN	Clark	24 min
Aug 26, 2:59 PM EDT	Special Weather Statement	ILN	Montgomery	31 min
Aug 26, 3:10 PM EDT	Severe Thunderstorm Warning	ILN	Montgomery	17 min
Aug 26, 3:13 PM EDT	Areal Flood Advisory	ILN	Butler	18 min
Aug 26, 3:15 PM EDT	Special Weather Statement	ILN	Butler	30 min
Aug 26, 3:23 PM EDT	Special Weather Statement	ILN	Miami	37 min
Aug 26, 3:23 PM EDT	Special Weather Statement	ILN	Butler	37 min
Aug 26, 3:31 PM EDT	Flash Flood Warning	ILN	Butler	65 min
Aug 26, 3:33 PM EDT	Special Weather Statement	ILN	Preble	27 min
Aug 26, 3:36 PM EDT	Areal Flood Advisory	ILN	Clark	62 min
Aug 26, 3:39 PM EDT	Areal Flood Advisory	ILN	Butler, Preble	2 hr
Aug 26, 3:50 PM EDT	Special Weather Statement	ILN	Miami	25 min
Aug 26, 4:11 PM EDT	Special Weather Statement	ILN	Madison	34 min
Aug 26, 4:17 PM EDT	Special Weather Statement	ILN	Preble	28 min
Aug 26, 4:23 PM EDT	Special Weather Statement	ILN	Miami	37 min
Aug 26, 4:27 PM EDT	Areal Flood Advisory	ILN	Darke, Miami, Montgomery, Preble	51 min
Aug 26, 4:32 PM EDT	Special Weather Statement	ILN	Warren	28 min
Aug 26, 4:34 PM EDT	Special Weather Statement	ILN	Union	26 min
Aug 26, 4:41 PM EDT	Special Weather Statement	ILN	Darke	34 min
Aug 26, 4:51 PM EDT	Areal Flood Advisory	ILN	Warren	75 min
Aug 26, 4:54 PM EDT	Special Weather Statement	ILN	Champaign	36 min
Aug 26, 5:21 PM EDT	Special Weather Statement	ILN	Mercer	24 min
Aug 26, 5:50 PM EDT	Special Weather Statement	ILN	Highland	25 min
Aug 26, 5:54 PM EDT	Areal Flood Advisory	ILN	Clermont	40 min
Aug 26, 5:54 PM EDT	Special Weather Statement	ILN	Ross	36 min
Aug 26, 6:00 PM EDT	Special Weather Statement	ILN	Adams, Brown	30 min
Aug 26, 6:31 PM EDT	Areal Flood Advisory	ILN	Adams	21 min
Aug 26, 6:31 PM EDT	Special Weather Statement	ILN	Adams	29 min
Aug 26, 6:52 PM EDT	Flash Flood Warning	ILN	Adams	98 min

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.