Alert archive / Ohio / Flash Flood Warnings in 2021

Flash Flood Warning 19, NWS Wilmington, OH

July 1, 2021Delaware County, Ohio

NWS Wilmington, OH issued this flash flood warning at Jul 1, 2021, 3:42 AM EDT for Delaware County, Ohio. It was in force for 2 hr. 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 1, 2021, 3:42 AM EDT (07:42 UTC)
Expired: Jul 1, 2021, 5:52 AM EDT
In force: 2 hr
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Flood severity: None

County Delaware County, OH

The radar

The Cincinnati radar (KILN), 112 km from the middle of the area, began a volume at 07:42 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 7.7 hours before the alert went out and 110 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: 1557 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

890 
WGUS51 KILN 010742
FFWILN
OHC041-011045-
/O.NEW.KILN.FF.W.0019.210701T0742Z-210701T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wilmington OH
342 AM EDT Thu Jul 1 2021

The National Weather Service in Wilmington has issued a

* Flash Flood Warning for...
  Southeastern Delaware County in central Ohio...

* Until 645 AM EDT.

* At 342 AM EDT, radar indicated thunderstorms producing heavy rain 
  across the warned area. Between 2 and 4 inches of rain have 
  fallen. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that may experience flash flooding include...
  Polaris, Lewis Center and Center Village.

Additional rainfall amounts of 0.5 to 1 inch are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4014 8303 4021 8302 4019 8280 4013 8281
      4013 8283

FLASH FLOOD...RADAR INDICATED

$$

Franks

1 follow-up statement

503 
WGUS71 KILN 010952
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
552 AM EDT Thu Jul 1 2021

OHC041-011002-
/O.CAN.KILN.FF.W.0019.000000T0000Z-210701T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Delaware OH-
552 AM EDT Thu Jul 1 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN DELAWARE 
COUNTY...

The heavy rain and flash flooding has ended across the area, but 
lingering flooding issues may continue through the morning rush 
hour. Therefore the flash flood warning has been replaced by a flood 
advisory. Please refer to that bulletin for more information and 
heed all road closures.

LAT...LON 4014 8303 4021 8302 4019 8280 4013 8281
      4013 8283

$$

Franks

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:26 PM EDT	Flash Flood Warning	ILN	Hamilton	3 hr
Jun 30, 8:31 PM EDT	Special Weather Statement	ILN	Scioto	29 min
Jun 30, 9:30 PM EDT	Areal Flood Advisory	ILN	Butler	104 min
Jun 30, 10:13 PM EDT	River Flood Warning	ILN	Hamilton	4 hr
Jun 30, 10:17 PM EDT	Areal Flood Advisory	ILN	Hamilton	10 hr
Jun 30, 10:39 PM EDT	Flash Flood Warning	ILN	Hamilton	3 hr
Jun 30, 10:42 PM EDT	Areal Flood Advisory	ILN	Clermont	2 hr
Jun 30, 11:23 PM EDT	Areal Flood Advisory	ILN	Hamilton	9 hr
Jul 1, 1:02 AM EDT	Flash Flood Watch	ILN	Adams, Brown, Butler, Clermont, Clinton, Hamilton and 6 more	19 hr
Jul 1, 3:08 AM EDT	Areal Flood Advisory	ILN	Delaware, Franklin, Licking	5 hr
Jul 1, 3:23 AM EDT	Special Weather Statement	ILN	Franklin	37 min
Jul 1, 3:27 AM EDT	Flash Flood Warning	ILN	Brown, Clermont	3 hr
Jul 1, 3:56 AM EDT	Areal Flood Advisory	ILN	Adams, Brown	4 hr
Jul 1, 4:16 AM EDT	Areal Flood Advisory	ILN	Scioto	4 hr
Jul 1, 5:16 AM EDT	Areal Flood Advisory	ILN	Darke, Preble	3 hr
Jul 1, 6:20 AM EDT	Areal Flood Advisory	ILN	Brown, Clermont	115 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.