Alert archive / Indiana / Flash Flood Watches in 2010

Flash Flood Watch 9, NWS Indianapolis, IN

July 20, 201010 counties in Indiana

NWS Indianapolis, IN issued this flash flood watch at Jul 20, 2010, 12:52 PM EDT for 10 counties in Indiana. It took effect at Jul 20, 2010, 2:00 PM EDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Jul 20, 2010, 12:52 PM EDT (16:52 UTC)
In effect from: Jul 20, 2010, 2:00 PM EDT
Expired: Jul 21, 2010, 7:40 AM EDT
In force: 18 hr
Issued by: NWS Indianapolis, IN
Flood severity: None

Counties Clay County, IN, Daviess County, IN, Greene County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Owen County, IN, Sullivan County, IN, Vigo County, IN

The radar

The Indianapolis radar (KIND), 97 km from the middle of the area, began a volume at 16:54 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, 4.9 hours before the alert went out and 279 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: 39 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Indianapolis, IN wrote its last area forecast discussion before this flash flood watch went out at Jul 20, 11:20 AM EDT, 1 hour 32 minutes earlier.

Area forecast discussion, Jul 20, 11:20 AM EDT, 1 hour 32 minutes before

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Hazardous weather outlook, Jul 20, 4:59 AM EDT, 7 hours 53 minutes before

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In the hours before

Local storm report, Jul 20, 9:58 AM EDT, 2 hours 54 minutes before

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Local storm report, Jul 20, 10:40 AM EDT, 2 hours 12 minutes before

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Local storm report, Jul 20, 10:53 AM EDT, 1 hour 59 minutes before

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Local storm report, Jul 20, 11:11 AM EDT, 1 hour 41 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 6:24 PM EDT	Areal Flood Advisory	IND	Hancock, Henry, Rush, Shelby	3 hr
Jul 20, 7:22 PM EDT	Tornado Warning	IND	Bartholomew, Johnson, Shelby	23 min
Jul 20, 7:44 PM EDT	Tornado Warning	IND	Shelby	31 min
Jul 20, 7:48 PM EDT	Tornado Warning	IND	Bartholomew, Jackson, Jennings	27 min

Nearby

Flash Flood Watches in Indiana, 2010 Every flash flood watch in 2010

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.