Alert archive / Illinois / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 12, NWS Chicago, IL

April 8, 20206 counties in Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Apr 8, 2020, 4:37 PM CDT for 6 counties in Illinois. It was in force for 23 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: Apr 8, 2020, 4:37 PM CDT (21:37 UTC)
Expired: Apr 8, 2020, 5:00 PM CDT
In force: 23 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL

The radar

The Chicago radar (KLOT), 50 km from the middle of the area, began a volume at 21:38 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.

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 Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 8, 3:11 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Apr 8, 3:11 PM CDT, 1 hour 26 minutes before

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Hazardous weather outlook, Apr 8, 3:38 PM CDT, 59 minutes before

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<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>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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In the hours before

Special weather statement, Apr 8, 4:02 PM CDT, 35 minutes before

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  <title>Service Notice</title>
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</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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Special weather statement, Apr 8, 4:20 PM CDT, 17 minutes before

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  <title>Service Notice</title>
  <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 7:01 PM CDT	Severe Thunderstorm Warning	LOT	Boone, Winnebago	59 min
Apr 7, 7:27 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, McHenry, Ogle	48 min
Apr 7, 8:17 PM CDT	Severe Thunderstorm Warning	LOT	Cook	28 min
Apr 7, 8:17 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage	45 min
Apr 7, 8:27 PM CDT	Special Weather Statement	LOT	DeKalb	18 min
Apr 7, 8:28 PM CDT	Special Marine Warning	LOT		47 min
Apr 7, 8:38 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane	25 min
Apr 7, 8:40 PM CDT	Severe Thunderstorm Warning	LOT	Cook	50 min
Apr 7, 9:13 PM CDT	Areal Flood Advisory	LOT	Cook	3 hr
Apr 7, 9:13 PM CDT	Special Weather Statement	LOT	DuPage	17 min
Apr 7, 9:27 PM CDT	Special Weather Statement	LOT	DuPage	18 min
Apr 8, 3:45 AM CDT	Gale Watch	LOT		18 hr
Apr 8, 3:45 AM CDT	Marine Dense Fog Advisory	LOT		6 hr
Apr 8, 3:45 AM CDT	Small Craft Advisory	LOT		27 hr
Apr 8, 4:16 AM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, Lee, McHenry, Ogle, Winnebago	5 hr
Apr 8, 9:37 AM CDT	Marine Dense Fog Advisory	LOT		9 hr
Apr 8, 4:02 PM CDT	Special Weather Statement	LOT	LaSalle	28 min
Apr 8, 4:20 PM CDT	Special Weather Statement	LOT	Kane	25 min
Apr 8, 4:54 PM CDT	Special Marine Warning	LOT		66 min
Apr 8, 4:59 PM CDT	Special Weather Statement	LOT	Cook, Lake	16 min
Apr 8, 5:08 PM CDT	Special Weather Statement	LOT	DeKalb	37 min
Apr 8, 5:38 PM CDT	Special Weather Statement	LOT	Kane, Kendall	22 min
Apr 7, 8:19 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	41 min
Apr 7, 8:55 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	65 min
Apr 7, 9:57 PM CDT	Special Weather Statement	LOT	Lake	33 min
Apr 8, 6:40 PM CDT	Special Weather Statement	LOT	Benton	20 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2020 Every severe thunderstorm 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; radar from the NEXRAD Level II archive.