Alert archive / Illinois / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 171, NWS Lincoln, IL

June 30, 2023Schuyler County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 30, 2023, 10:23 AM CDT for Schuyler County, Illinois. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 2023, 10:23 AM CDT (15:23 UTC)
Expired: Jun 30, 2023, 11:00 AM CDT
In force: 37 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Schuyler County, IL

The radar

The Lincoln radar (KILX), 109 km from the middle of the area, began a volume at 15:27 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

Lincoln, IL (KILX), launched 12:00Z, 3.4 hours before the alert went out and 171 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: 80 J/kg
Mixed-layer CIN: -484 J/kg
Mixed-layer LCL: 1055 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 78 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 30, 5:50 AM CDT, 4 hours 33 minutes earlier.

Area forecast discussion, Jun 30, 5:50 AM CDT, 4 hours 33 minutes before

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Hazardous weather outlook, Jun 30, 6:12 AM CDT, 4 hours 11 minutes before

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In the hours before

Local storm report, Jun 30, 6:56 AM CDT, 3 hours 27 minutes before

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Local storm report, Jun 30, 7:39 AM CDT, 2 hours 44 minutes before

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Local storm report, Jun 30, 8:31 AM CDT, 1 hour 52 minutes before

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Local storm report, Jun 30, 9:09 AM CDT, 1 hour 14 minutes before

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Local storm report, Jun 30, 9:38 AM CDT, 45 minutes before

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Local storm report, Jun 30, 10:20 AM CDT, 3 minutes before

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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 3:39 AM CDT	Dense Fog Advisory	ILX	Cass, Champaign, Christian, DeWitt, Fulton, Knox and 16 more	5 hr
Jun 30, 10:28 AM CDT	Special Weather Statement	ILX	Fulton	17 min
Jun 30, 10:55 AM CDT	Special Weather Statement	ILX	Fulton, Schuyler	35 min
Jun 30, 11:14 AM CDT	Special Weather Statement	ILX	Mason, Tazewell	16 min
Jun 30, 1:35 PM CDT	Special Weather Statement	ILX	Vermilion	25 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2023 Every severe thunderstorm warning in 2023

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.