Alert archive / Illinois / Frost Advisories in 2023

Frost Advisory 4, NWS Lincoln, IL

April 23, 2023Clay County, Lawrence County, Richland County, Illinois

NWS Lincoln, IL issued this frost advisory at Apr 23, 2023, 2:46 AM CDT for Clay County, Lawrence County, Richland County, Illinois. It took effect at Apr 24, 2023, 1:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued
Apr 23, 2023, 2:46 AM CDT (07:46 UTC)
In effect from
Apr 24, 2023, 1:00 AM CDT
Expired
Apr 23, 2023, 1:58 PM CDT
In force
Issued by
NWS Lincoln, IL

Counties Clay County, IL, Lawrence County, IL, Richland County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 7.8 hours before the alert went out and 164 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2023-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2023-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1457 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
86 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 frost advisory 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 frost advisory went out at Apr 22, 6:53 PM CDT, 7 hours 53 minutes earlier.

Area forecast discussion, Apr 22, 6:53 PM CDT, 7 hours 53 minutes before
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Hazardous weather outlook, Apr 22, 2:44 PM CDT, 12 hours 2 minutes before
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 23, 2:46 AM CDTFreeze WarningILXCass, Champaign, Christian, Clark, Clay, Coles and 29 more29 hr

Nearby

Frost Advisories in Illinois, 2023Every frost advisory 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.