Alert archive / Ohio / Winter Weather Advisories in 2021

Winter Weather Advisory 11, NWS Cleveland, OH

April 20, 202120 counties in Ohio; Erie County, Pennsylvania

NWS Cleveland, OH issued this winter weather advisory at Apr 20, 2021, 3:54 AM EDT for 20 counties in Ohio; Erie County, Pennsylvania. It took effect at Apr 20, 2021, 7:00 PM EDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Apr 20, 2021, 3:54 AM EDT (07:54 UTC)
In effect from: Apr 20, 2021, 7:00 PM EDT
Expired: Apr 21, 2021, 10:07 AM EDT
In force: 15 hr
Issued by: NWS Cleveland, OH

All 21 counties

Ashland County, OH, Ashtabula County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Hancock County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Wood County, OH, Wyandot County, OH, Erie County, PA

The radar

The Cleveland radar (KCLE), 52 km from the middle of the area, began a volume at 07:53 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

Detroit, MI (KDTX), launched 00:00Z, 7.9 hours before the alert went out and 182 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: 802 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 142 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 Cleveland, OH wrote its last area forecast discussion before this winter weather advisory went out at Apr 20, 1:35 AM EDT, 2 hours 19 minutes earlier.

Area forecast discussion, Apr 20, 1:35 AM EDT, 2 hours 19 minutes before

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Hazardous weather outlook, Apr 19, 4:18 PM EDT, 11 hours 36 minutes before

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The office that day

Everything else NWS Cleveland, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 3:47 AM EDT	Small Craft Advisory	CLE		43 hr
Apr 20, 3:57 AM EDT	Freeze Warning	CLE	Hancock, Lucas, Marion, Wood, Wyandot	30 hr
Apr 20, 3:53 PM EDT	Freeze Watch	CLE	Knox, Morrow	18 hr

Nearby

Winter Weather Advisories in Ohio, 2021 Winter Weather Advisories in Pennsylvania, 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.