Alert archive / Ohio / Flash Flood Warnings in 2018

Flash Flood Warning 12, NWS Cleveland, OH

September 3, 2018Mahoning County, Trumbull County, Ohio

NWS Cleveland, OH issued this flash flood warning at Sep 3, 2018, 5:39 PM EDT for Mahoning County, Trumbull County, Ohio. It was in force for 4 hr. 2 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: Sep 3, 2018, 5:39 PM EDT (21:39 UTC)
Expired: Sep 3, 2018, 9:45 PM EDT
In force: 4 hr
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Flood severity: None

Counties Mahoning County, OH, Trumbull County, OH

The radar

The Pittsburgh radar (KPBZ), 76 km from the middle of the area, began a volume at 21:39 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
Sep 3, 6:00 PM EDT	FLOOD	1 E Girard, OH	APPARTMENT BUILDING BASEMENT FLOODING. TIME APPROX.
Sep 3, 6:50 PM EDT	FLOOD	Girard, OH	ESTIMATED ONE FOOT OF WATER ON ROAD. ST CLAIR AND BROADWAY.

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

The nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 9.7 hours before the alert went out and 92 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: 1128 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1035 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

118 
WGUS51 KCLE 032139
FFWCLE
OHC099-155-040145-
/O.NEW.KCLE.FF.W.0012.180903T2139Z-180904T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Cleveland OH
539 PM EDT MON SEP 3 2018

The National Weather Service in Cleveland has issued a

* Flash Flood Warning for...
  Southeastern Trumbull County in northeastern Ohio...
  Northeastern Mahoning County in northeastern Ohio...

* Until 945 PM EDT.

* At 538 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Youngstown, Niles, Hubbard, Maplewood Park, Hilltop, Austintown,
  Girard, McDonald and Churchill.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

LAT...LON 4110 8074 4121 8074 4122 8052 4109 8052
      4109 8053

$$

King

1 follow-up statement

095 
WGUS71 KCLE 040142
FFSCLE

Flash Flood Statement
National Weather Service Cleveland OH
942 PM EDT MON SEP 3 2018

OHC099-155-040151-
/O.EXP.KCLE.FF.W.0012.000000T0000Z-180904T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Trumbull OH-Mahoning OH-
942 PM EDT MON SEP 3 2018

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN TRUMBULL AND NORTHEASTERN
MAHONING COUNTIES WILL EXPIRE AT 945 PM EDT...

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

LAT...LON 4110 8074 4121 8074 4122 8052 4109 8052
      4109 8053

$$

King

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 5:23 PM EDT	Severe Thunderstorm Warning	CLE	Mahoning, Trumbull	36 min
Sep 3, 5:54 PM EDT	Flash Flood Warning	CLE	Lucas	3 hr
Sep 3, 6:12 PM EDT	Areal Flood Advisory	CLE	Portage	2 hr
Sep 3, 6:19 PM EDT	Severe Thunderstorm Warning	CLE	Trumbull	41 min

Nearby

Flash Flood Warnings in Ohio, 2018 Every flash flood warning in 2018

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.