Alert archive / Illinois / Freeze Warnings in 2020

Freeze Warning 1, NWS Lincoln, IL

April 9, 202015 counties in Illinois

NWS Lincoln, IL issued this freeze warning at Apr 9, 2020, 2:33 PM CDT for 15 counties in Illinois. It took effect at Apr 10, 2020, 2:00 AM CDT. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 9, 2020, 2:33 PM CDT (19:33 UTC)
In effect from: Apr 10, 2020, 2:00 AM CDT
Expired: Apr 10, 2020, 9:00 AM CDT
In force: 7 hr
Issued by: NWS Lincoln, IL

Counties Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Macon County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 73 km from the middle of the area, began a volume at 19:36 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, 7.6 hours before the alert went out and 51 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: 1855 m above ground
0-6 km bulk shear: 98 kt
0-1 km storm-relative helicity: -64 m²/s²
0-3 km storm-relative helicity: -36 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 freeze 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 freeze warning went out at Apr 9, 12:10 PM CDT, 2 hours 23 minutes earlier.

Area forecast discussion, Apr 9, 12:10 PM CDT, 2 hours 23 minutes before

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Hazardous weather outlook, Apr 9, 11:37 AM CDT, 2 hours 56 minutes before

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In the hours before

Local storm report, Apr 9, 8:43 AM CDT, 5 hours 50 minutes before

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Local storm report, Apr 9, 10:54 AM CDT, 3 hours 39 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
Apr 8, 7:13 PM CDT	Severe Thunderstorm Warning	ILX	Clark, Clay, Crawford, Effingham, Jasper, Lawrence and 1 more	47 min
Apr 8, 7:57 PM CDT	Severe Thunderstorm Warning	ILX	Clay, Lawrence, Richland	33 min
Apr 9, 3:28 AM CDT	Wind Advisory	ILX	Cass, Champaign, Christian, Coles, DeWitt, Douglas and 21 more	16 hr

Nearby

Freeze Warnings in Illinois, 2020 Every freeze warning in 2020

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.