Alert archive / Indiana / Winter Weather Advisories in 2021

Winter Weather Advisory 10, NWS Northern Indiana

April 20, 202112 counties in Indiana; 8 counties in Ohio; Hillsdale County, Michigan

NWS Northern Indiana issued this winter weather advisory at Apr 20, 2021, 3:49 AM EDT for 12 counties in Indiana; 8 counties in Ohio; Hillsdale County, Michigan. It took effect at Apr 20, 2021, 7:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Apr 20, 2021, 3:49 AM EDT (07:49 UTC)
In effect from: Apr 20, 2021, 7:00 PM EDT
Expired: Apr 21, 2021, 3:15 AM EDT
In force: 8 hr
Issued by: NWS Northern Indiana

All 21 counties

Adams County, IN, Allen County, IN, Blackford County, IN, DeKalb County, IN, Grant County, IN, Huntington County, IN, Jay County, IN, Noble County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Hillsdale County, MI, Allen County, OH, Defiance County, OH, Fulton County, OH, Henry County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 74 km from the middle of the area, began a volume at 07:49 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, 7.8 hours before the alert went out and 206 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: 2301 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 124 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 winter weather advisory 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 winter weather advisory went out at Apr 20, 1:38 AM EDT, 2 hours 11 minutes earlier.

Area forecast discussion, Apr 20, 1:38 AM EDT, 2 hours 11 minutes before

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Hazardous weather outlook, Apr 19, 3:52 PM EDT, 11 hours 57 minutes before

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Nearby

Winter Weather Advisories in Indiana, 2021 Winter Weather Advisories in Ohio, 2021 Winter Weather Advisories in Michigan, 2021 Every winter weather advisory 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.