Alert archive / Missouri / Areal Flood Warnings in 2011

Areal Flood Warning 67, NWS St. Louis, MO

July 8, 2011Saint Louis County, Missouri; Monroe County, Illinois

NWS St. Louis, MO issued this areal flood warning at Jul 8, 2011, 12:03 AM CDT for Saint Louis County, Missouri; Monroe 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: Jul 8, 2011, 12:03 AM CDT (05:03 UTC)
Expired: Jul 8, 2011, 9:00 AM CDT
In force: 9 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Monroe County, IL, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 42 km from the middle of the area, began a volume at 05:06 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, 5.1 hours before the alert went out and 239 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: 143 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

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 Jul 7, 11:55 PM CDT, 8 minutes earlier.

Area forecast discussion, Jul 7, 11:55 PM CDT, 8 minutes before

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Hazardous weather outlook, Jul 7, 10:49 PM CDT, 1 hour 14 minutes before

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In the hours before

Local storm report, Jul 7, 8:04 PM CDT, 3 hours 59 minutes before

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Local storm report, Jul 7, 9:03 PM CDT, 3 hours before

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Local storm report, Jul 7, 10:21 PM CDT, 1 hour 42 minutes before

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Local storm report, Jul 7, 10:47 PM CDT, 1 hour 16 minutes before

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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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Local storm report, Jul 7, 11:31 PM CDT, 32 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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      <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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Local storm report, Jul 7, 11:34 PM CDT, 29 minutes before

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<body>
  <main class="wrap">
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      <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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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 7:07 PM CDT	Tornado Warning	LSX	Sainte Genevieve	23 min
Jul 7, 7:51 PM CDT	Flash Flood Warning	LSX	Sainte Genevieve	6 hr
Jul 8, 3:17 PM CDT	Heat Advisory	LSX	Audrain, Boone, Callaway, Cole, Crawford, Franklin and 23 more	4 days
Jul 7, 7:14 PM CDT	Flash Flood Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	6 hr
Jul 7, 7:48 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	42 min
Jul 7, 11:30 PM CDT	Areal Flood Warning	LSX	Fayette, Marion	10 hr
Jul 8, 10:19 AM CDT	River Flood Warning	LSX	Fayette	10 hr

Nearby

Areal Flood Warnings in Missouri, 2011 Areal Flood Warnings in Illinois, 2011 Every areal flood warning in 2011

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.