Alert archive / Indiana / Flash Flood Warnings in 2021

Flash Flood Warning 31, NWS Wilmington, OH

August 27, 20214 counties in Indiana

NWS Wilmington, OH issued this flash flood warning at Aug 27, 2021, 5:13 PM EDT for 4 counties in Indiana. It was in force for 113 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 27, 2021, 5:13 PM EDT (21:13 UTC)
Expired: Aug 27, 2021, 7:06 PM EDT
In force: 113 min
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Flood severity: None

Counties Dearborn County, IN, Ohio County, IN, Ripley County, IN, Switzerland County, IN

The radar

The Louisville radar (KLVX), 124 km from the middle of the area, began a volume at 21:13 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 9.2 hours before the alert went out and 134 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: 167 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1311 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

661 
WGUS51 KILN 272113
FFWILN
INC029-115-137-155-280045-
/O.NEW.KILN.FF.W.0031.210827T2113Z-210828T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wilmington OH
513 PM EDT Fri Aug 27 2021

The National Weather Service in Wilmington has issued a

* Flash Flood Warning for...
  Southwestern Dearborn County in southeastern Indiana...
  Ohio County in southeastern Indiana...
  Southeastern Ripley County in southeastern Indiana...
  Northwestern Switzerland County in southeastern Indiana...

* Until 845 PM EDT.

* At 513 PM EDT, radar indicated thunderstorms producing heavy rain 
  across the warned area. Between 1 and 2 inches of rain have 
  fallen. The expected rainfall rate is 2 inches in 1 hour. 
  Additional rainfall amounts of 1 to 2 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that may experience flash flooding include...
  Pleasant, Fairview, Friendship, Cross Plains, Farmers Retreat, 
  Avonburg, Olean, Bear Branch and Benham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

To report flash flooding, go to our website at weather.gov/iln and 
submit your report via social media, when you can do so safely.

&&

LAT...LON 3891 8531 3897 8530 3902 8525 3903 8518
      3899 8499 3887 8505 3885 8520 3892 8520
      3891 8527 3891 8528 3891 8530

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2 INCHES IN 1 HOUR

$$

Hickman

2 follow-up statements

325 
WGUS71 KILN 272213
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
613 PM EDT Fri Aug 27 2021

INC029-115-137-155-280045-
/O.CON.KILN.FF.W.0031.000000T0000Z-210828T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dearborn IN-Ohio IN-Ripley IN-Switzerland IN-
613 PM EDT Fri Aug 27 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM EDT THIS 
EVENING FOR SOUTHWESTERN DEARBORN, OHIO, SOUTHEASTERN RIPLEY AND 
NORTHWESTERN SWITZERLAND COUNTIES...

At 613 PM EDT, radar and automated rain gauges indicated 
thunderstorms has produced heavy rain across the warned area. 
Between 2 and 3 inches of rain have fallen. Flash flooding is 
ongoing or expected.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that may experience flash flooding include...
  Pleasant, Fairview, Friendship, Cross Plains, Farmers Retreat, 
  Avonburg, Olean, Bear Branch and Benham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

To report flash flooding, go to our website at weather.gov/iln and 
submit your report via social media, when you can do so safely.

&&

LAT...LON 3891 8531 3897 8530 3902 8525 3903 8518
      3899 8499 3887 8505 3885 8520 3892 8520
      3891 8527 3891 8528 3891 8530

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Hickman

554 
WGUS71 KILN 272306
FFSILN

Flash Flood Statement
National Weather Service Wilmington OH
706 PM EDT Fri Aug 27 2021

INC029-115-137-155-272316-
/O.CAN.KILN.FF.W.0031.000000T0000Z-210828T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dearborn IN-Ohio IN-Ripley IN-Switzerland IN-
706 PM EDT Fri Aug 27 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN DEARBORN, OHIO, 
SOUTHEASTERN RIPLEY AND NORTHWESTERN SWITZERLAND COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3891 8531 3897 8530 3902 8525 3903 8518
      3899 8499 3887 8505 3885 8520 3892 8520
      3891 8527 3891 8528 3891 8530

$$

Hickman

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 4:34 PM EDT	Special Weather Statement	ILN	Switzerland	26 min
Aug 27, 5:01 PM EDT	Severe Thunderstorm Warning	ILN	Dearborn, Ripley, Switzerland	33 min
Aug 27, 5:03 PM EDT	Areal Flood Advisory	ILN	Dearborn, Ohio, Ripley, Switzerland	10 min
Aug 27, 5:08 PM EDT	Severe Thunderstorm Warning	ILN	Switzerland	37 min
Aug 27, 5:33 PM EDT	Areal Flood Advisory	ILN	Switzerland	3 hr
Aug 27, 7:10 PM EDT	Special Weather Statement	ILN	Union	35 min

Nearby

Flash Flood Warnings in Indiana, 2021 Every flash flood warning in 2021

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.