Alert archive / Illinois / Flash Flood Watches in 2020

Flash Flood Watch 8, NWS Lincoln, IL

July 30, 20206 counties in Illinois

NWS Lincoln, IL issued this flash flood watch at Jul 30, 2020, 2:58 AM CDT for 6 counties in Illinois. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Jul 30, 2020, 2:58 AM CDT (07:58 UTC)
Expired: Jul 30, 2020, 8:25 PM CDT
In force: 17 hr
Issued by: NWS Lincoln, IL
Flood severity: None

Counties Clay County, IL, Crawford County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Richland County, IL

The radar

The Evansville,IN radar (KVWX), 77 km from the middle of the area, began a volume at 08:00 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 00:00Z, 8.0 hours before the alert went out and 147 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: 348 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1581 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 40 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 flash flood watch 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 flash flood watch went out at Jul 29, 11:52 PM CDT, 3 hours 6 minutes earlier.

Area forecast discussion, Jul 29, 11:52 PM CDT, 3 hours 6 minutes before

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Hazardous weather outlook, Jul 29, 3:07 PM CDT, 11 hours 51 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>
      <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.
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        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.

Issued	Product	Office	Counties	Lasted
Jul 30, 2:40 PM CDT	Areal Flood Warning	ILX	Christian, Coles, Cumberland, Moultrie, Shelby	6 hr
Jul 30, 6:53 PM CDT	Areal Flood Warning	ILX	Lawrence	3 hr

Nearby

Flash Flood Watches in Illinois, 2020 Every flash flood watch 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.