Alert archive / Indiana / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS Indianapolis, IN

July 8, 2021Decatur County, Indiana

NWS Indianapolis, IN issued this flash flood warning at Jul 8, 2021, 3:00 PM EDT for Decatur County, Indiana. 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: Jul 8, 2021, 3:00 PM EDT (19:00 UTC)
Expired: Jul 8, 2021, 6:00 PM EDT
In force: 3 hr
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Flood severity: None

County Decatur County, IN

The radar

The Indianapolis radar (KIND), 78 km from the middle of the area, began a volume at 19:03 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, 7.0 hours before the alert went out and 150 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: 187 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

929 
WGUS53 KIND 081900
FFWIND
INC031-082200-
/O.NEW.KIND.FF.W.0025.210708T1900Z-210708T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Indianapolis IN
300 PM EDT Thu Jul 8 2021

The National Weather Service in Indianapolis has issued a

* Flash Flood Warning for...
  Decatur County in central Indiana...

* Until 600 PM EDT.

* At 300 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across 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 will experience flash flooding include...
  Greensburg, Adams, Milford, Westport, Millhousen, Letts and Burney.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3939 8563 3939 8543 3927 8530 3926 8530
      3913 8557 3913 8569 3935 8568 3935 8563

FLASH FLOOD...RADAR INDICATED

$$

JS

The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 8, 5:18 AM EDT	Special Weather Statement	IND	Clinton, Tippecanoe	42 min
Jul 8, 5:26 AM EDT	Special Weather Statement	IND	Warren	49 min
Jul 8, 5:46 AM EDT	Areal Flood Advisory	IND	Tippecanoe, Warren	3 hr
Jul 8, 12:10 PM EDT	Special Weather Statement	IND	Hancock	35 min
Jul 8, 12:40 PM EDT	Special Weather Statement	IND	Rush	50 min
Jul 8, 12:54 PM EDT	Severe Thunderstorm Warning	IND	Rush	36 min
Jul 8, 1:28 PM EDT	Severe Thunderstorm Warning	IND	Decatur, Rush	32 min
Jul 8, 1:51 PM EDT	Special Weather Statement	IND	Putnam	54 min
Jul 8, 2:21 PM EDT	Areal Flood Advisory	IND	Decatur	3 hr
Jul 8, 2:30 PM EDT	Special Weather Statement	IND	Hendricks, Morgan	45 min
Jul 8, 2:58 PM EDT	Special Weather Statement	IND	Johnson, Marion	47 min
Jul 8, 3:42 PM EDT	Severe Thunderstorm Warning	IND	Jennings	48 min
Jul 8, 4:32 PM EDT	Special Weather Statement	IND	Brown, Monroe	28 min
Jul 8, 4:34 PM EDT	Special Weather Statement	IND	Jennings	26 min
Jul 8, 4:54 PM EDT	Severe Thunderstorm Warning	IND	Lawrence, Martin	21 min
Jul 8, 4:58 PM EDT	Special Weather Statement	IND	Jackson	32 min
Jul 8, 5:18 PM EDT	Special Weather Statement	IND	Henry	27 min
Jul 8, 5:22 PM EDT	Special Weather Statement	IND	Jackson	23 min
Jul 8, 5:49 PM EDT	Special Weather Statement	IND	Jackson	26 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.