Alert archive / Indiana / Flash Flood Watches in 2018

Flash Flood Watch 5, NWS Northern Indiana

September 7, 201812 counties in Indiana; 6 counties in Ohio

NWS Northern Indiana issued this flash flood watch at Sep 7, 2018, 3:36 AM EDT for 12 counties in Indiana; 6 counties in Ohio. It took effect at Sep 8, 2018, 8:00 AM EDT. It was in force for 22 hr.

The area

The counties it named.

The facts

Issued: Sep 7, 2018, 3:36 AM EDT (07:36 UTC)
In effect from: Sep 8, 2018, 8:00 AM EDT
Expired: Sep 9, 2018, 5:30 AM EDT
In force: 22 hr
Issued by: NWS Northern Indiana
Flood severity: None

Counties Adams County, IN, Allen County, IN, Blackford County, IN, Cass County, IN, Grant County, IN, Huntington County, IN, Jay County, IN, Miami County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Defiance County, OH, Henry County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH

The radar

The Northern Indiana radar (KIWX), 70 km from the middle of the area, began a volume at 07:39 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 00:00Z, 7.6 hours before the alert went out and 198 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: 134 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1353 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 7 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 Northern Indiana wrote its last area forecast discussion before this flash flood watch went out at Sep 7, 12:12 AM EDT, 3 hours 24 minutes earlier.

Area forecast discussion, Sep 7, 12:12 AM EDT, 3 hours 24 minutes before

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Hazardous weather outlook, Sep 6, 5:35 AM EDT, 22 hours 1 minute before

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The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 7, 11:26 AM EDT	Areal Flood Advisory	IWX	Blackford, Grant, Jay	6 hr
Sep 7, 2:00 PM EDT	River Flood Warning	IWX	Blackford, Huntington, Jay, Wabash, Wells	4 days
Sep 7, 2:00 PM EDT	River Flood Warning	IWX	Adams, Allen	25 hr
Sep 7, 3:36 PM EDT	Small Craft Advisory	IWX		70 hr
Sep 7, 2:00 PM EDT	River Flood Warning	IWX	Allen, Paulding, Putnam	5 days

Nearby

Flash Flood Watches in Indiana, 2018 Flash Flood Watches in Ohio, 2018 Every flash flood watch in 2018

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.