Alert archive / Ohio / Flash Flood Warnings in 2020

Flash Flood Warning 8, NWS Cleveland, OH

June 21, 2020Knox County, Ohio

NWS Cleveland, OH issued this flash flood warning at Jun 21, 2020, 7:31 PM EDT for Knox County, Ohio. It was in force for 4 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: Jun 21, 2020, 7:31 PM EDT (23:31 UTC)
Expired: Jun 21, 2020, 11:30 PM EDT
In force: 4 hr
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Flood severity: None

County Knox County, OH

The radar

The Cleveland radar (KCLE), 134 km from the middle of the area, began a volume at 23:33 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 12:00Z, 11.5 hours before the alert went out and 146 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: 26 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1659 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

692 
WGUS51 KCLE 212331
FFWCLE
OHC083-220330-
/O.NEW.KCLE.FF.W.0008.200621T2331Z-200622T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cleveland OH
731 PM EDT Sun Jun 21 2020

The National Weather Service in Cleveland has issued a

* Flash Flood Warning for...
  Knox County in north central Ohio...

* Until 1130 PM EDT.

* At 731 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have 
  already fallen with high rainfall rates. Flash flooding is 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  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 will experience flooding include...
  Mount Vernon, Fredericktown, Gambier, Utica, Centerburg, Waterford,
  Martinsburg and North Liberty.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4024 8248 4027 8248 4027 8274 4028 8275
      4035 8275 4034 8265 4036 8264 4055 8264
      4056 8223 4024 8236

FLASH FLOOD...RADAR INDICATED

$$

Jamison

1 follow-up statement

810 
WGUS71 KCLE 220321
FFSCLE

Flash Flood Statement
National Weather Service Cleveland OH
1121 PM EDT Sun Jun 21 2020

OHC083-220331-
/O.EXP.KCLE.FF.W.0008.000000T0000Z-200622T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox OH-
1121 PM EDT Sun Jun 21 2020

...THE FLASH FLOOD WARNING FOR KNOX COUNTY WILL EXPIRE AT 1130 PM
EDT...

Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 4024 8248 4027 8248 4027 8274 4028 8275
      4035 8275 4034 8265 4036 8264 4055 8264
      4056 8223 4024 8236

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 2:36 PM EDT	Special Weather Statement	CLE	Ashtabula	24 min
Jun 21, 3:23 PM EDT	Special Weather Statement	CLE	Erie	37 min
Jun 21, 3:57 PM EDT	Special Weather Statement	CLE	Trumbull	33 min
Jun 21, 5:08 PM EDT	Special Weather Statement	CLE	Trumbull	52 min
Jun 21, 5:17 PM EDT	Special Weather Statement	CLE	Knox, Marion, Morrow	58 min
Jun 21, 5:24 PM EDT	Special Weather Statement	CLE	Medina	36 min
Jun 21, 5:32 PM EDT	Severe Thunderstorm Warning	CLE	Marion	43 min
Jun 21, 5:36 PM EDT	Severe Thunderstorm Warning	CLE	Geauga, Portage	39 min
Jun 21, 5:39 PM EDT	Severe Thunderstorm Warning	CLE	Medina, Summit	38 min
Jun 21, 5:55 PM EDT	Special Weather Statement	CLE	Hancock, Wyandot	65 min
Jun 21, 6:02 PM EDT	Severe Thunderstorm Warning	CLE	Portage	43 min
Jun 21, 6:18 PM EDT	Special Weather Statement	CLE	Knox, Morrow, Richland	27 min
Jun 21, 6:27 PM EDT	Severe Thunderstorm Warning	CLE	Ashland, Richland	25 min
Jun 21, 6:54 PM EDT	Severe Thunderstorm Warning	CLE	Knox, Morrow, Richland	51 min
Jun 21, 7:01 PM EDT	Special Weather Statement	CLE	Ashland, Crawford, Richland, Sandusky, Seneca	59 min
Jun 21, 7:39 PM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron, Sandusky, Seneca	51 min

Nearby

Flash Flood Warnings in Ohio, 2020 Every flash flood warning in 2020

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.