Alert archive / Illinois / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 65, NWS Chicago, IL

June 21, 20145 counties in Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Jun 21, 2014, 2:42 PM CDT for 5 counties in Illinois. It was in force for 48 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 21, 2014, 2:42 PM CDT (19:42 UTC)
Expired: Jun 21, 2014, 3:30 PM CDT
In force: 48 min
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Livingston County, IL, Will County, IL

The radar

The Chicago radar (KLOT), 56 km from the middle of the area, began a volume at 19:44 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 21, 1:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.7 hours before the alert went out and 113 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: 47 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 1469 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 34 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 Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 2:34 PM CDT, 8 minutes earlier.

Area forecast discussion, Jun 21, 2:34 PM CDT, 8 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <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>
</html>

Hazardous weather outlook, Jun 21, 11:00 AM CDT, 3 hours 42 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <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>
</html>

In the hours before

Special weather statement, Jun 21, 12:39 PM CDT, 2 hours 3 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <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>
</html>

Local storm report, Jun 21, 1:08 PM CDT, 1 hour 34 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <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>
</html>

Special weather statement, Jun 21, 1:11 PM CDT, 1 hour 31 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <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>
</html>

Local storm report, Jun 21, 2:08 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
208 PM CDT SAT JUN 21 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0133 PM     HAIL             4 SE NEW LENOX          41.48N 87.93W
06/21/2014  E0.50 INCH       WILL               IL   COCORAHS

            SIZE - 1/4 TO 1/2 INCH.

0140 PM     HEAVY RAIN       4 SE NEW LENOX          41.48N 87.93W
06/21/2014  E0.59 INCH       WILL               IL   COCORAHS

            RAINFALL IN APPROX 13 MINUTES.

&&

BN

Local storm report, Jun 21, 2:10 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
210 PM CDT SAT JUN 21 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0130 PM     HAIL             5 ENE MANHATTAN         41.45N 87.90W
06/21/2014  E0.25 INCH       WILL               IL   COCORAHS

&&

BN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:22 PM CDT	Dense Fog Advisory	LOT	Lake	14 hr
Jun 20, 9:01 PM CDT	River Flood Advisory	LOT	LaSalle	48 hr
Jun 20, 9:01 PM CDT	River Flood Advisory	LOT	Bureau, LaSalle	58 hr
Jun 21, 12:39 PM CDT	Special Weather Statement	LOT	Kendall	36 min
Jun 21, 1:11 PM CDT	Special Weather Statement	LOT	Will	34 min
Jun 21, 1:16 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Grundy, Kankakee, Will	44 min
Jun 21, 3:28 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois, Kankakee, Livingston	62 min
Jun 21, 3:35 PM CDT	Special Weather Statement	LOT	Winnebago	40 min
Jun 21, 3:41 PM CDT	Areal Flood Advisory	LOT	Grundy, Iroquois, Kankakee, LaSalle, Livingston	6 hr
Jun 21, 4:01 PM CDT	Special Weather Statement	LOT	Lee	44 min
Jun 21, 4:09 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	49 min
Jun 21, 4:17 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Lake, McHenry	58 min
Jun 21, 4:23 PM CDT	Tornado Warning	LOT	Lake, McHenry	34 min
Jun 21, 4:40 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Lee	52 min
Jun 21, 4:41 PM CDT	Special Marine Warning	LOT		2 hr
Jun 21, 4:46 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois	47 min
Jun 21, 4:51 PM CDT	Tornado Warning	LOT	Iroquois	39 min
Jun 21, 5:07 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kane, Lake	53 min
Jun 21, 5:11 PM CDT	Areal Flood Advisory	LOT	Cook, DeKalb, DuPage, Kane, Lake, Lee and 2 more	6 hr
Jun 21, 5:36 PM CDT	Flash Flood Warning	LOT	Cook, DuPage	6 hr
Jun 21, 5:37 PM CDT	Special Marine Warning	LOT		83 min
Jun 21, 5:42 PM CDT	Areal Flood Advisory	LOT	Iroquois	6 hr
Jun 21, 5:44 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Grundy, Kane, Kendall, Will	61 min
Jun 21, 5:56 PM CDT	Areal Flood Advisory	LOT	DeKalb, Grundy, Kane, Kendall, Will	6 hr
Jun 21, 6:32 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	58 min
Jun 21, 6:36 PM CDT	Flash Flood Warning	LOT	Lake	6 hr

Nearby

Severe Thunderstorm Warnings in Illinois, 2014 Every severe thunderstorm warning in 2014

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.