Alert archive / Ohio / Flash Flood Warnings in 2011

Flash Flood Warning 6, NWS Cleveland, OH

May 12, 2011Ashtabula County, Geauga County, Lake County, Ohio

NWS Cleveland, OH issued this flash flood warning at May 12, 2011, 3:44 PM EDT for Ashtabula County, Geauga County, Lake County, Ohio. It was in force for 3 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: May 12, 2011, 3:44 PM EDT (19:44 UTC)
Expired: May 12, 2011, 6:30 PM EDT
In force: 3 hr
Issued by: NWS Cleveland, OH
Area: Storm-based polygon
Flood severity: None

Counties Ashtabula County, OH, Geauga County, OH, Lake County, OH

The radar

The Cleveland radar (KCLE), 71 km from the middle of the area, began a volume at 19:45 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, 7.7 hours before the alert went out and 158 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1624 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 44 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.

016 
WGUS51 KCLE 121944
FFWCLE
OHC007-055-085-122230-
/O.NEW.KCLE.FF.W.0006.110512T1944Z-110512T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CLEVELAND OH
344 PM EDT THU MAY 12 2011

THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LAKE COUNTY IN NORTHEAST OHIO
  NORTHEASTERN GEAUGA COUNTY IN NORTHEAST OHIO
  WESTERN ASHTABULA COUNTY IN NORTHEAST OHIO

* UNTIL 630 PM EDT

* AT 341 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. RAINFALL RATES OF OVER 1 INCH AN HOUR ARE BEING OBSERVED 
  BY DOPPLER RADAR. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING FROM CHARDON TO 
  THE ASHTABULA COUNTY LINE. 
  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS...DRAINAGE DITCHES...AND STREAMS. FLOODING IS LIKELY ALONG LOW
LYING ROADS AND FARMLAND. NEVER DRIVE ACROSS A FLOODED ROAD. TURN
AROUND...DON'T DROWN!

&&

LAT...LON 4178 8094 4153 8091 4152 8112 4151 8124
      4169 8123

$$

SJ/KO

2 follow-up statements

928 
WGUS71 KCLE 122111
FFSCLE

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
511 PM EDT THU MAY 12 2011

OHC007-055-085-122230-
/O.CON.KCLE.FF.W.0006.000000T0000Z-110512T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GEAUGA OH-LAKE OH-ASHTABULA OH-
511 PM EDT THU MAY 12 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WESTERN ASHTABULA...
CENTRAL LAKE AND NORTHEASTERN GEAUGA COUNTIES UNTIL 630 PM EDT...

AT 503 PM EDT...DOPPLER RADAR HAD ESTIMATED AROUND TWO INCHES OF 
RAINFALL HAD FALLEN OVER THE WARNED AREA WITHIN AN HOUR AND A HALF.
THIS TORRENTIAL RAINFALL OVER STEEP TERRAIN WILL CONTINUE TO CAUSE A 
FLASH FLOOD THREAT DESPITE THE FACT THAT MOST OF THE RAIN HAS 
DISSIPATED. 

SEVERAL CREEKS INCLUDING THE ALYWORTH...PAINE...EAST...AND TAILCOTT 
CREEKS ARE VULNERABLE TO RAPID WATER RISES. THESE CREEKS WILL FLOW 
INTO THE GRAND RIVER...WHICH WILL EXPERIENCE A QUICK RISE THIS 
EVENING. AREAS EFFECTED INCLUDE CHARDON...PAINESVILLE...AND 
SURROUNDING AREAS. 


LAT...LON 4178 8094 4153 8091 4152 8112 4151 8124
      4169 8123

$$

SJ

393 
WGUS71 KCLE 122225
FFSCLE

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
625 PM EDT THU MAY 12 2011

OHC007-055-085-122230-
/O.CON.KCLE.FF.W.0006.000000T0000Z-110512T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GEAUGA OH-LAKE OH-ASHTABULA OH-
625 PM EDT THU MAY 12 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WESTERN ASHTABULA...
CENTRAL LAKE AND NORTHEASTERN GEAUGA COUNTIES UNTIL 630 PM EDT...

AREA CREEKS CONTINUE TO COME UP ACROSS THE WARNED AREA...INCLUDING 
THE BEAR CREEK IN SOUTHERN LAKE COUNTY. DOPPLER RADAR ESTIMATES 
AROUND 2 INCHES OF RAINFALL FELL FROM EARLIER STORMS. AN ADDITIONAL 
HALF TO AN INCH OF RAIN IS POSSIBLE WITH A SECOND ROUND OF STORMS. 
FLOODING CONDITIONS WILL LIKELY CONTINUE INTO THE EVENING HOURS. 
TOWNS IMPACTED INCLUDE CONCORD AND CHARDIN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATER IS USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.


LAT...LON 4178 8094 4153 8091 4152 8112 4151 8124
      4169 8123

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 5:11 AM EDT	Severe Thunderstorm Warning	CLE	Ashland, Richland	49 min
May 12, 6:03 AM EDT	Severe Thunderstorm Warning	CLE	Ashland, Holmes, Wayne	57 min
May 12, 7:02 AM EDT	Severe Thunderstorm Warning	CLE	Holmes	58 min
May 12, 8:23 AM EDT	Special Marine Warning	CLE		82 min
May 12, 2:50 PM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron, Lorain	40 min
May 12, 3:33 PM EDT	Severe Thunderstorm Warning	CLE	Ashtabula, Geauga, Lake	42 min
May 12, 3:34 PM EDT	Severe Thunderstorm Warning	CLE	Crawford, Huron, Richland, Seneca	56 min
May 12, 3:50 PM EDT	Severe Thunderstorm Warning	CLE	Ashland, Medina, Wayne	55 min
May 12, 3:54 PM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron	51 min
May 12, 3:56 PM EDT	Severe Thunderstorm Warning	CLE	Medina, Portage, Summit	64 min
May 12, 4:08 PM EDT	Severe Thunderstorm Warning	CLE	Cuyahoga, Medina, Summit	67 min
May 12, 4:11 PM EDT	Areal Flood Advisory	CLE	Ashland, Cuyahoga, Erie, Geauga, Huron, Lake and 5 more	10 hr
May 12, 4:14 PM EDT	Severe Thunderstorm Warning	CLE	Ashtabula, Geauga, Lake	46 min
May 12, 4:19 PM EDT	Severe Thunderstorm Warning	CLE	Trumbull	41 min
May 12, 4:26 PM EDT	Areal Flood Warning	CLE	Erie, Huron	3 hr
May 12, 4:39 PM EDT	Severe Thunderstorm Warning	CLE	Geauga, Portage, Trumbull	51 min
May 12, 4:45 PM EDT	Severe Thunderstorm Warning	CLE	Geauga	45 min
May 12, 4:58 PM EDT	Severe Thunderstorm Warning	CLE	Ashland, Medina, Wayne	47 min
May 12, 5:27 PM EDT	Areal Flood Advisory	CLE	Mahoning, Trumbull	9 hr
May 12, 5:29 PM EDT	River Flood Warning	CLE	Erie, Huron	7 hr
May 12, 5:43 PM EDT	Special Marine Warning	CLE		77 min
May 12, 5:58 PM EDT	Severe Thunderstorm Warning	CLE	Mahoning	47 min
May 12, 6:38 PM EDT	Areal Flood Advisory	CLE	Sandusky, Seneca	3 hr
May 12, 6:43 PM EDT	Areal Flood Warning	CLE	Geauga, Lake	4 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.