Alert archive / Ohio / Flash Flood Warnings in 2012

Flash Flood Warning 16, NWS Wilmington, OH

May 21, 2012Highland County, Ohio

NWS Wilmington, OH issued this flash flood warning at May 21, 2012, 6:45 PM EDT for Highland County, Ohio. It was in force for 3 hr. 1 report 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: May 21, 2012, 6:45 PM EDT (22:45 UTC)
Expired: May 21, 2012, 9:45 PM EDT
In force: 3 hr
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Flood severity: None

County Highland County, OH

The radar

The Cincinnati radar (KILN), 23 km from the middle of the area, began a volume at 22:47 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
May 21, 8:15 PM EDT	FLASH FLOOD	4 W Hillsboro, OH	NUMEROUS REPORTS OF RAPIDLY RISING WATER ACROSS CENTRAL AND NORTHWESTERN PART OF COUNTY. US ROUTE 50 NEAR MAD RIVER ROAD...N HIGH STREET NEAR HOBART DRIVE...AND CAREY ROAD NEAR FALLSVILLE WILDERNESS AREA WERE ALL CLOSED. BALLPARK IN HILLSBORO WAS SUBMERGED.

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 12:00Z, 10.8 hours before the alert went out and 23 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: 1563 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 20 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.

493 
WGUS51 KILN 212245
FFWILN
OHC071-220145-
/O.NEW.KILN.FF.W.0016.120521T2245Z-120522T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
645 PM EDT MON MAY 21 2012

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN HIGHLAND COUNTY IN SOUTHWEST OHIO...

* UNTIL 945 PM EDT.

* AT 630 PM EDT...RADAR INDICATED THAT THUNDERSTORMS HAD PRODUCED   
HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATED TWO TO THREE 
INCHES HAVE FALLEN IN THE WARNED AREA.

* HEAVY RAIN CONTINUES TO FALL ACROSS THE WARNED AREA WITH ANOTHER   
ONE TO ONE AND A HALF INCHES POSSIBLE THROUGH 9 PM EDT. RUNOFF FROM 
THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
HILLSBORO...LEESBURG...LYNCHBURG...
SAMANTHA...PAINT CREEK STATE PARK...
AND ALONG US ROUTE 62 BETWEEN HILLSBORO AND LYNCHBURG.

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.

&&

LAT...LON 3918 8380 3924 8380 3926 8378 3938 8360
      3938 8342 3928 8343 3918 8352

$$

HATZOS

1 follow-up statement

691 
WGUS71 KILN 220013
FFSILN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
813 PM EDT MON MAY 21 2012

OHC071-220145-
/O.CON.KILN.FF.W.0016.000000T0000Z-120522T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HIGHLAND OH-
813 PM EDT MON MAY 21 2012

...FLASH FLOOD WARNING CONTINUES FOR NORTHERN HIGHLAND COUNTY UNTIL
945 PM EDT...

AT 810 PM EDT...HEAVY RAINFALL HAD ENDED ACROSS NORTHERN HIGHLAND 
COUNTY. DOPPLER RADAR HAS INDICATED THAT 2 TO 4 INCHES OF RAIN FELL 
IN NORTHERN HIGHLAND COUNTY...WITH THE HIGHEST TOTALS NEAR SAMANTHA 
AND LEESBURG. LOCAL LAW ENFORCEMENT IS REPORTING THAT FLOODING IS 
OCCURRING ON OHIO ROUTE 72 AND US ROUTE 62.

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 3918 8380 3924 8380 3926 8378 3938 8360
      3938 8342 3928 8343 3918 8352

$$

HATZOS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 3:47 PM EDT	Special Weather Statement	ILN	Clermont	28 min
May 21, 4:25 PM EDT	Special Weather Statement	ILN	Highland	20 min
May 21, 4:34 PM EDT	Special Weather Statement	ILN	Adams	26 min
May 21, 4:46 PM EDT	Special Weather Statement	ILN	Adams	29 min
May 21, 4:49 PM EDT	Severe Thunderstorm Warning	ILN	Adams, Brown	20 min
May 21, 5:04 PM EDT	Areal Flood Advisory	ILN	Adams, Brown	2 hr
May 21, 5:17 PM EDT	Areal Flood Advisory	ILN	Highland	2 hr
May 21, 5:19 PM EDT	Special Weather Statement	ILN	Highland	56 min
May 21, 5:41 PM EDT	Flash Flood Warning	ILN	Adams, Brown	3 hr
May 21, 6:02 PM EDT	Areal Flood Advisory	ILN	Highland	2 hr
May 21, 6:38 PM EDT	Special Weather Statement	ILN	Highland	37 min
May 21, 6:48 PM EDT	Areal Flood Advisory	ILN	Brown	3 hr

Nearby

Flash Flood Warnings in Ohio, 2012 Every flash flood warning in 2012

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.