Alert archive / Ohio / Flash Flood Warnings in 2011

Flash Flood Warning 41, NWS Wilmington, OH

July 23, 2011Delaware County, Franklin County, Licking County, Ohio

NWS Wilmington, OH issued this flash flood warning at Jul 23, 2011, 11:57 PM EDT for Delaware County, Franklin County, Licking County, Ohio. It was in force for 6 hr. 3 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: Jul 23, 2011, 11:57 PM EDT (03:57 UTC)
Expired: Jul 24, 2011, 5:32 AM EDT
In force: 6 hr
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Flood severity: None

Counties Delaware County, OH, Franklin County, OH, Licking County, OH

The radar

The Cincinnati radar (KILN), 127 km from the middle of the area, began a volume at 03:58 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
Jul 24, 12:25 AM EDT	HEAVY RAIN 1.5	Gahanna, OH	FELL OVER THE PAST HOUR
Jul 24, 1:05 AM EDT	FLASH FLOOD	Westerville, OH	COUNTY LINE RD CLOSED BETWEEN SPRING RD AND HEMPSTEAD RD. ONE CAR STRANDED IN THE HIGH WATER.
Jul 24, 4:00 AM EDT	FLASH FLOOD	Center Village, OH	ROADS CLOSED DUE TO HIGH WATER AND SOME DRIVEWAYS WASHED OUT

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

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 4.0 hours before the alert went out and 125 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: 2855 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 994 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

090 
WGUS51 KILN 240357
FFWILN
OHC041-049-089-240700-
/O.NEW.KILN.FF.W.0041.110724T0357Z-110724T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
1157 PM EDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DELAWARE COUNTY IN CENTRAL OHIO...
  NORTHERN FRANKLIN COUNTY IN CENTRAL OHIO...
  WESTERN LICKING COUNTY IN CENTRAL OHIO...

* UNTIL 300 AM EDT.

* AT 1153 PM EDT...RADAR INDICATED THAT THUNDERSTORMS HAD PRODUCED   
HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATED 2 TO 3 INCHES 
OF RAIN HAD FALLEN.

* HEAVY RAIN CONTINUES TO FALL ACROSS THE WARNED AREA WITH ANOTHER   
1 TO 2 INCHES POSSIBLE THROUGH 130 AM EDT. RUNOFF FROM THIS   
EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BEXLEY...
COLUMBUS...DELAWARE...DUBLIN...GAHANNA...GRANVILLE...HEATH...
HILLIARD...NEWARK...REYNOLDSBURG...UPPER ARLINGTON AND WESTERVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ACT QUICKLY TO PROTECT YOUR LIFE IF YOU ARE IN A LOW LYING AREA...
ALONG A CREEK...STREAM OR IN AN AREA EXPERIENCING FLOODING. MOVE TO
HIGHER GROUND IMMEDIATELY.

NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. ONLY A FEW INCHES
OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. FIND AN
ALTERNATE ROUTE OR WAIT UNTIL THE WATER RECEDES. FLOOD DANGERS ARE 
HARDER TO RECOGNIZE AT NIGHT. BE ESPECIALLY
CAUTIOUS.

&&

LAT...LON 3992 8242 3994 8282 3992 8293 4005 8317
      4039 8316 4043 8301 4042 8293 4036 8292
      4035 8275 4028 8274 4027 8252 4027 8248
      4025 8247 4024 8236

$$

HATZOS

3 follow-up statements

116 
WGUS71 KILN 240525
FFSILN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
125 AM EDT SUN JUL 24 2011

OHC041-049-089-240700-
/O.CON.KILN.FF.W.0041.000000T0000Z-110724T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE OH-FRANKLIN OH-LICKING OH-
125 AM EDT SUN JUL 24 2011

...FLASH FLOOD WARNING CONTINUES FOR WESTERN LICKING...NORTHERN
FRANKLIN AND DELAWARE COUNTIES IN CENTRAL OHIO UNTIL 300 AM EDT...

AT 118 AM EDT...RADAR INDICATED THAT THUNDERSTORMS HAD PRODUCED HEAVY
RAINFALL ACROSS THE WARNED AREA. SIGNIFICANT RAINFALL HAS AFFECTED 
AN AREA ROUGHLY BETWEEN DELAWARE AND PATASKALA. THE HEAVIEST RAIN 
FELL ALONG THE DELAWARE-FRANKLIN COUNTY LINE...NEAR WESTERVILLE AND 
NEW ALBANY...WITH UP TO 3-4 INCHES OF RAINFALL.

ADDITIONAL SHOWERS AND THUNDERSTORMS WILL DEVELOP THROUGH THE NIGHT. 
AN ADDITIONAL HALF INCH TO INCH OF RAIN WILL BE POSSIBLE THROUGH 3 
AM.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING 
INCLUDE...BEXLEY...COLUMBUS...DELAWARE...NEW ALBANY...
DUBLIN...GAHANNA...GRANVILLE...HEATH...HILLIARD...
JOHNSTOWN...GALENA...WORTHINGTON...
NEWARK...REYNOLDSBURG...UPPER ARLINGTON AND WESTERVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. ONLY A FEW INCHES
OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. FIND AN
ALTERNATE ROUTE OR WAIT UNTIL THE WATER RECEDES.

FLOOD DANGERS ARE HARDER TO RECOGNIZE AT NIGHT. BE ESPECIALLY
CAUTIOUS.

&&

LAT...LON 3992 8242 3994 8282 3992 8293 4005 8317
      4039 8316 4043 8301 4042 8293 4036 8292
      4035 8275 4028 8274 4027 8252 4027 8248
      4025 8247 4024 8236

$$

HATZOS

405 
WGUS51 KILN 240647
FFWILN
OHC041-049-089-241000-
/O.EXT.KILN.FF.W.0041.000000T0000Z-110724T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
247 AM EDT SUN JUL 24 2011

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  DELAWARE COUNTY IN CENTRAL OHIO...
  NORTHERN FRANKLIN COUNTY IN CENTRAL OHIO...
  WESTERN LICKING COUNTY IN CENTRAL OHIO...

* UNTIL 600 AM EDT.

* AT 244 AM EDT...RADAR INDICATED THAT SCATTERED THUNDERSTORMS 
CONTINUE ACROSS THE WARNED AREA.

* SIGNIFICANT RAINFALL AFFECTED AN AREA ROUGHLY BETWEEN DELAWARE AND 
PATASKALA. THE HEAVIEST RAIN FELL ALONG THE DELAWARE-FRANKLIN COUNTY 
LINE...NEAR WESTERVILLE AND NEW ALBANY...WITH UP TO 3-4 INCHES OF 
RAINFALL. AN ADDITIONAL ONE TO TWO INCHES OF RAIN WILL BE POSSIBLE 
THROUGH 6 AM.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BEXLEY...
COLUMBUS...DELAWARE...DUBLIN...GAHANNA...GRANVILLE...HEATH...
HILLIARD...NEWARK...REYNOLDSBURG...UPPER ARLINGTON AND WESTERVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. ONLY A FEW INCHES
OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. FIND AN
ALTERNATE ROUTE OR WAIT UNTIL THE WATER RECEDES.

FLOOD DANGERS ARE HARDER TO RECOGNIZE AT NIGHT. BE ESPECIALLY
CAUTIOUS.

&&

LAT...LON 3992 8242 3994 8282 3992 8293 4005 8317
      4039 8316 4043 8301 4042 8293 4036 8292
      4035 8275 4028 8274 4027 8252 4027 8248
      4025 8247 4024 8236

$$

HATZOS

131 
WGUS71 KILN 240932
FFSILN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
532 AM EDT SUN JUL 24 2011

OHC041-049-089-240940-
/O.CAN.KILN.FF.W.0041.000000T0000Z-110724T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE OH-FRANKLIN OH-LICKING OH-
532 AM EDT SUN JUL 24 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR WESTERN LICKING...
NORTHERN FRANKLIN AND DELAWARE COUNTIES IN CENTRAL OHIO HAS BEEN
CANCELLED...

WHILE A FEW SHOWERS AND THUNDERSTORMS MAY MOVE THROUGH THE REGION AT 
TIMES THIS MORNING...SIGNIFICANT ADDITIONAL RAINFALL IS NO LONGER 
EXPECTED. LAW ENFORCEMENT HAS REPORTED NO ONGOING FLOODING 
PROBLEMS...AND HIGH WATER IS EXPECTED TO RECEDE...ENDING THE FLOOD 
THREAT. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR 
LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3992 8242 3994 8282 3992 8293 4005 8317
      4039 8316 4043 8301 4042 8293 4036 8292
      4035 8275 4028 8274 4027 8252 4027 8248
      4025 8247 4024 8236

$$

HATZOS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:09 PM EDT	Special Weather Statement	ILN	Hardin, Logan	36 min
Jul 23, 10:25 PM EDT	Areal Flood Advisory	ILN	Delaware, Union	114 min
Jul 23, 11:21 PM EDT	Areal Flood Advisory	ILN	Delaware, Franklin, Licking	59 min
Jul 23, 11:28 PM EDT	Special Weather Statement	ILN	Franklin	32 min
Jul 24, 3:53 AM EDT	Areal Flood Advisory	ILN	Clark, Fayette, Greene, Madison, Pickaway	3 hr
Jul 24, 4:39 AM EDT	Areal Flood Advisory	ILN	Fayette, Greene, Pickaway	2 hr
Jul 24, 3:08 PM EDT	Special Weather Statement	ILN	Greene	22 min
Jul 24, 3:11 PM EDT	Areal Flood Advisory	ILN	Greene, Montgomery	2 hr
Jul 24, 3:20 PM EDT	Severe Thunderstorm Warning	ILN	Greene, Montgomery, Warren	22 min
Jul 24, 3:37 PM EDT	Special Weather Statement	ILN	Butler	23 min
Jul 24, 3:44 PM EDT	Special Weather Statement	ILN	Darke	61 min
Jul 24, 3:44 PM EDT	Severe Thunderstorm Warning	ILN	Clark, Miami, Montgomery	17 min
Jul 24, 4:11 PM EDT	Areal Flood Advisory	ILN	Butler, Montgomery, Preble, Warren	2 hr
Jul 24, 4:17 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Logan, Shelby	43 min
Jul 24, 4:21 PM EDT	Areal Flood Advisory	ILN	Auglaize, Logan, Mercer, Shelby	2 hr
Jul 24, 4:47 PM EDT	Areal Flood Advisory	ILN	Clermont, Hamilton	118 min
Jul 24, 4:50 PM EDT	Areal Flood Advisory	ILN	Auglaize, Champaign, Hardin, Logan, Union	3 hr
Jul 24, 5:19 PM EDT	Flash Flood Warning	ILN	Champaign, Logan, Shelby	116 min
Jul 24, 5:42 PM EDT	Areal Flood Advisory	ILN	Delaware, Fairfield, Franklin, Madison, Pickaway, Union	3 hr
Jul 24, 5:47 PM EDT	Special Weather Statement	ILN	Franklin	43 min
Jul 24, 5:57 PM EDT	Severe Thunderstorm Warning	ILN	Delaware, Fairfield, Franklin, Licking, Madison, Pickaway and 1 more	48 min
Jul 24, 6:22 PM EDT	Flash Flood Warning	ILN	Franklin	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.