Alert archive / Illinois / Areal Flood Warnings in 2018

Areal Flood Warning 7, NWS St. Louis, MO

June 20, 2018Fayette County, Illinois

NWS St. Louis, MO issued this areal flood warning at Jun 20, 2018, 2:02 AM CDT for Fayette County, Illinois. It was in force for 9 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: Jun 20, 2018, 2:02 AM CDT (07:02 UTC)
Expired: Jun 20, 2018, 11:00 AM CDT
In force: 9 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Fayette County, IL

The radar

The Lincoln radar (KILX), 131 km from the middle of the area, began a volume at 07:03 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, 7.0 hours before the alert went out and 133 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: 1617 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -90 m²/s²
0-3 km storm-relative helicity: -97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this areal flood warning went out at Jun 20, 12:06 AM CDT, 1 hour 56 minutes earlier.

Area forecast discussion, Jun 20, 12:06 AM CDT, 1 hour 56 minutes before

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Hazardous weather outlook, Jun 19, 11:55 PM CDT, 2 hours 7 minutes before

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In the hours before

Local storm report, Jun 19, 9:50 PM CDT, 4 hours 12 minutes before

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Local storm report, Jun 19, 10:03 PM CDT, 3 hours 59 minutes before

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    <section class="card" role="status" aria-live="polite">
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      <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.
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        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 St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 7:12 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 min
Jun 20, 2:48 AM CDT	Areal Flood Advisory	LSX	Franklin, Gasconade, Montgomery, Saint Charles, Warren	7 hr
Jun 20, 4:05 PM CDT	Special Weather Statement	LSX	Lewis	40 min
Jun 20, 5:09 PM CDT	Special Weather Statement	LSX	Marion, Ralls	66 min
Jun 20, 5:21 PM CDT	Special Weather Statement	LSX	Audrain, Callaway	54 min
Jun 20, 6:44 PM CDT	Special Weather Statement	LSX	Pike	46 min
Jun 19, 7:21 PM CDT	Special Weather Statement	LSX	Fayette	24 min
Jun 19, 8:12 PM CDT	Flash Flood Warning	LSX	Fayette	6 hr
Jun 20, 6:16 PM CDT	Special Weather Statement	LSX	Adams, Brown, Pike	59 min

Nearby

Areal Flood Warnings in Illinois, 2018 Every areal flood warning in 2018

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.