Alert archive / Indiana / Flash Flood Warnings in 2020

Flash Flood Warning 9, NWS Indianapolis, IN

August 10, 20205 counties in Indiana

NWS Indianapolis, IN issued this flash flood warning at Aug 10, 2020, 8:16 PM EDT for 5 counties in Indiana. It was in force for 59 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 10, 2020, 8:16 PM EDT (00:16 UTC)
Expired: Aug 10, 2020, 9:15 PM EDT
In force: 59 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Flood severity: None

Counties Brown County, IN, Greene County, IN, Johnson County, IN, Monroe County, IN, Morgan County, IN

The radar

The Indianapolis radar (KIND), 60 km from the middle of the area, began a volume at 00:17 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

Lincoln, IL (KILX), launched 00:00Z, 0.3 hours before the alert went out and 208 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: 1523 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -307 m²/s²
0-3 km storm-relative helicity: -226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

374 
WGUS53 KIND 110016
FFWIND
INC013-055-081-105-109-110115-
/O.NEW.KIND.FF.W.0009.200811T0016Z-200811T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Indianapolis IN
816 PM EDT Mon Aug 10 2020

The National Weather Service in Indianapolis has issued a

* Flash Flood Warning for...
  Central Monroe County in south central Indiana...
  Southeastern Morgan County in central Indiana...
  Northern Brown County in south central Indiana...
  Johnson County in central Indiana...
  Eastern Greene County in southwestern Indiana...

* Until 915 PM EDT.

* At 815 PM EDT, Doppler radar indicated thunderstorms producing 
  torrential rain across the warned area. Localized flash flooding 
  is ongoing or expected to begin, especially on roads and low-lying 
  areas. 

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Bloomington, Franklin, Bloomfield, Ellettsville, Whiteland,
  Bargersville, Princes Lakes, Trafalgar, Morgantown, Mahalasville,
  Peoga, Indiana University, Helmsburg, Lake Lemon, Beanblossom,
  Yellowwood Lake, Spearsville, Solsberry, Unionville and Whitehall.

# This includes Interstate 65 between mile markers 84 and 95.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3903 8703 3917 8678 3917 8668 3922 8668
      3962 8596 3938 8596 3934 8602 3935 8608
      3931 8609 3890 8687 3890 8690

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

$$

TWF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 8:01 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Brown, Jackson, Jennings, Lawrence, Monroe	59 min
Aug 10, 8:26 PM EDT	Areal Flood Advisory	IND	Daviess, Greene, Knox, Sullivan	64 min
Aug 10, 8:58 PM EDT	Severe Thunderstorm Warning	IND	Jackson, Jennings	47 min
Aug 10, 9:04 PM EDT	Flash Flood Warning	IND	Jackson	56 min

Nearby

Flash Flood Warnings in Indiana, 2020 Every flash flood warning in 2020

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.