Alert archive / Missouri / Areal Flood Warnings in 2018

Areal Flood Warning 1, NWS St. Louis, MO

February 24, 20188 counties in Missouri

NWS St. Louis, MO issued this areal flood warning at Feb 24, 2018, 9:50 PM CST for 8 counties in Missouri. It was in force for 12 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: Feb 24, 2018, 9:50 PM CST (03:50 UTC)
Expired: Feb 25, 2018, 9:45 AM CST
In force: 12 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Crawford County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 102 km from the middle of the area, began a volume at 03:47 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, 3.8 hours before the alert went out and 319 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: 594 m above ground
0-6 km bulk shear: 79 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 388 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 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 Feb 24, 5:40 PM CST, 4 hours 10 minutes earlier.

Area forecast discussion, Feb 24, 5:40 PM CST, 4 hours 10 minutes before

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Hazardous weather outlook, Feb 24, 7:42 PM CST, 2 hours 8 minutes before

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In the hours before

Local storm report, Feb 24, 5:25 PM CST, 4 hours 25 minutes before

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Local storm report, Feb 24, 6:52 PM CST, 2 hours 58 minutes before

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Local storm report, Feb 24, 8:55 PM CST, 55 minutes before

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Local storm report, Feb 24, 9:06 PM CST, 44 minutes before

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Local storm report, Feb 24, 9:08 PM CST, 42 minutes before

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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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Local storm report, Feb 24, 9:11 PM CST, 39 minutes before

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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.
      </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 St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 25, 8:09 AM CST	River Flood Warning	LSX	Franklin	3 days
Feb 25, 8:09 AM CST	River Flood Warning	LSX	Franklin, Jefferson	4 days
Feb 25, 8:09 AM CST	River Flood Warning	LSX	Jefferson, Saint Louis	4 days
Feb 25, 8:09 AM CST	River Flood Warning	LSX	Jefferson, Saint Louis	4 days
Feb 25, 8:28 AM CST	River Flood Warning	LSX	Osage	3 days
Feb 25, 9:48 AM CST	Areal Flood Warning	LSX	Crawford, Iron, Madison, Reynolds, Washington	9 hr

Nearby

Areal Flood Warnings in Missouri, 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.