Alert archive / Indiana / Flash Flood Warnings in 2020

Flash Flood Warning 7, NWS Indianapolis, IN

July 19, 2020Sullivan County, Indiana

NWS Indianapolis, IN issued this flash flood warning at Jul 19, 2020, 10:45 PM EDT for Sullivan County, Indiana. It was in force for 4 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: Jul 19, 2020, 10:45 PM EDT (02:45 UTC)
Expired: Jul 20, 2020, 2:45 AM EDT
In force: 4 hr
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Flood severity: None

County Sullivan County, IN

The radar

The Evansville,IN radar (KVWX), 84 km from the middle of the area, began a volume at 02:44 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 20, 12:30 AM EDT	FLASH FLOOD	1 Sw Paxton, IN	DISPATCH REPORTED THAT US 41 WAS CLOSED BETWEEN COUNTY ROAD 400S AND 600S DUE TO WATER FLOWING OVER THE ROADS. ROAD WAS CLOSED FOR SEVERAL HOURS.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 158 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: 1662 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

133 
WGUS53 KIND 200245
FFWIND
INC153-200645-
/O.NEW.KIND.FF.W.0007.200720T0245Z-200720T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Indianapolis IN
1045 PM EDT Sun Jul 19 2020

The National Weather Service in Indianapolis has issued a

* Flash Flood Warning for...
  Sullivan County in southwestern Indiana...

* Until 245 AM EDT.

* At 1044 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar indicates over 4 inches 
  of rain has fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  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...
  Sullivan, Dugger, Carlisle, Merom, Pleasantville, Turtle Creek
  Reservoir, Graysville and Paxton.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3913 8759 3916 8725 3890 8724 3890 8742
      3891 8753 3892 8753 3893 8752 3894 8752
      3896 8751 3897 8753 3899 8758 3899 8756
      3900 8758 3903 8757 3904 8758 3906 8757
      3907 8759

FLASH FLOOD...RADAR INDICATED

$$

Puma

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 10:10 PM EDT	Areal Flood Advisory	IND	Knox, Sullivan	3 hr
Jul 19, 11:35 PM EDT	Special Weather Statement	IND	Knox	25 min
Jul 20, 12:57 AM EDT	Areal Flood Warning	IND	Vermillion, Vigo	6 hr
Jul 20, 3:03 AM EDT	Areal Flood Warning	IND	Sullivan	6 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.