Alert archive / Ohio / Flash Flood Warnings in 2011

Flash Flood Warning 40, NWS Cleveland, OH

September 10, 2011Mahoning County, Ohio

NWS Cleveland, OH issued this flash flood warning at Sep 10, 2011, 12:13 PM EDT for Mahoning County, Ohio. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 10, 2011, 12:13 PM EDT (16:13 UTC)
Expired: Sep 10, 2011, 1:04 PM EDT
In force: 51 min
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Flood severity: None

County Mahoning County, OH

The radar

The Pittsburgh radar (KPBZ), 65 km from the middle of the area, began a volume at 16:16 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

Pittsburgh, PA (KPIT), launched 12:00Z, 4.2 hours before the alert went out and 82 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: 102 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

626 
WGUS51 KCLE 101613
FFWCLE
OHC099-102000-
/O.NEW.KCLE.FF.W.0040.110910T1613Z-110910T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CLEVELAND OH
1213 PM EDT SAT SEP 10 2011

THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MAHONING COUNTY IN NORTHEAST OHIO...

* UNTIL 400 PM EDT.

* AT 1210 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
  WARNED AREA. RADAR ESTIMATES THAT BETWEEN 2 AND 3 INCHES OF RAIN
  HAVE FALLEN OVER THE EAST SIDE OF THE YOUNGSTOWN AREA FROM 11AM
  UNTIL NOON WITH ADDITIONAL HEAVY RAIN IN THE AREA.

* LOCATIONS IMPACTED INCLUDE...
  YOUNGSTOWN...
  CAMPBELL...
  BOARDMAN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4098 8051 4097 8052 4098 8070 4111 8070
      4114 8070 4113 8052 4108 8051

$$

TK

1 follow-up statement

971 
WGUS71 KCLE 101704
FFSCLE

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
104 PM EDT SAT SEP 10 2011

OHC099-101717-
/O.CAN.KCLE.FF.W.0040.000000T0000Z-110910T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAHONING OH-
104 PM EDT SAT SEP 10 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN
MAHONING COUNTY IS CANCELLED...

THE STATIONARY THUNDERSTORM OVER THE AREA HAS DISSIPATED AND THE 
EXCESS RUNOFF FROM THE HEAVY RAIN HAS ENDED OVER THE WARNED 
AREA....ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN 
OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4098 8051 4097 8052 4098 8070 4111 8070
      4114 8070 4113 8052 4108 8051

$$

KING

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 8:57 AM EDT	Areal Flood Advisory	CLE	Cuyahoga, Geauga, Portage, Summit, Trumbull	3 hr
Sep 10, 9:22 AM EDT	Flood Watch	CLE	Ashtabula, Cuyahoga, Geauga, Lake, Portage, Summit and 1 more	6 hr
Sep 10, 9:53 AM EDT	Areal Flood Warning	CLE	Geauga, Portage	4 hr
Sep 10, 4:37 PM EDT	Areal Flood Advisory	CLE	Holmes, Wayne	3 hr
Sep 10, 4:53 PM EDT	Areal Flood Advisory	CLE	Crawford, Seneca, Wyandot	3 hr
Sep 10, 5:05 PM EDT	River Flood Warning	CLE	Trumbull	33 hr
Sep 10, 5:28 PM EDT	Areal Flood Warning	CLE	Crawford, Seneca, Wyandot	4 hr
Sep 10, 7:08 PM EDT	Areal Flood Advisory	CLE	Stark, Summit	3 hr

Nearby

Flash Flood Warnings in Ohio, 2011 Every flash flood warning in 2011

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.