Alert archive / Ohio / Flash Flood Warnings in 2011

Flash Flood Warning 38, NWS Cleveland, OH

August 19, 2011Geauga County, Ohio

NWS Cleveland, OH issued this flash flood warning at Aug 19, 2011, 4:43 AM EDT for Geauga County, Ohio. It was in force for 107 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
Aug 19, 2011, 4:43 AM EDT (08:43 UTC)
Expired
Aug 19, 2011, 6:30 AM EDT
In force
107 min
Issued by
NWS Cleveland, OH
Area
Storm-based polygon
Flood severity
None

County Geauga County, OH

The radar

The Cleveland radar (KCLE), 50 km from the middle of the area, began a volume at 08:42 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

Pittsburgh, PA (KPIT), launched 00:00Z, 8.7 hours before the alert went out and 148 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-pSkew-T log-p diagram, Pittsburgh, PA at 00:00Z on 2011-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 201 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 00:00Z on 2011-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
201 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
1889 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
29 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.

041 
WGUS51 KCLE 190843
FFWCLE
OHC055-191200-
/O.NEW.KCLE.FF.W.0038.110819T0843Z-110819T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CLEVELAND OH
443 AM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN GEAUGA COUNTY IN NORTHEAST OHIO...

* UNTIL 800 AM EDT.

* AT 438 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. TWO TO THREE INCHES OF RAIN HAVE FALLEN IN THE LAST 
  HOUR.

* LOCATIONS IMPACTED INCLUDE...
  SOUTH RUSSELL...
  MIDDLEFIELD...
  BURTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4135 8100 4135 8127 4135 8139 4142 8139
      4143 8138 4144 8138 4145 8139 4149 8139
      4151 8101

$$

GARNET
1 follow-up statement
019 
WGUS71 KCLE 191030
FFSCLE

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CLEVELAND OH
630 AM EDT FRI AUG 19 2011

OHC055-191045-
/O.CAN.KCLE.FF.W.0038.000000T0000Z-110819T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GEAUGA OH-
630 AM EDT FRI AUG 19 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN GEAUGA
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CLEVELAND.

LAT...LON 4135 8100 4135 8127 4135 8139 4142 8139
      4143 8138 4144 8138 4145 8139 4149 8139
      4151 8101

$$

GARNET

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:06 PM EDTSpecial Marine WarningCLE114 min
Aug 18, 8:53 PM EDTSevere Thunderstorm WarningCLECuyahoga, Geauga67 min
Aug 18, 9:10 PM EDTSevere Thunderstorm WarningCLEAshtabula, Geauga, Lake65 min
Aug 19, 3:58 AM EDTSevere Thunderstorm WarningCLEGeauga, Portage, Summit62 min
Aug 19, 5:00 AM EDTSevere Thunderstorm WarningCLEAshtabula, Geauga, Portage, Trumbull60 min
Aug 19, 5:57 AM EDTSevere Thunderstorm WarningCLEMahoning, Portage, Trumbull63 min
Aug 19, 2:30 PM EDTFlash Flood WarningCLEKnox87 min

Nearby

Flash Flood Warnings in Ohio, 2011Every 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.