Alert archive / South Dakota / River Flood Warnings in 2018

River Flood Warning 63, NWS Sioux Falls, SD

April 19, 2018Clay County, South Dakota

NWS Sioux Falls, SD issued this river flood warning at Apr 19, 2018, 10:16 AM CDT for Clay County, South Dakota. It took effect at Apr 21, 2018, 11:30 PM CDT. It was in force for 35 hr.

The area

The counties it named.

The facts

Issued: Apr 19, 2018, 10:16 AM CDT (15:16 UTC)
In effect from: Apr 21, 2018, 11:30 PM CDT
Expired: Apr 23, 2018, 10:17 AM CDT
In force: 35 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: Minor

County Clay County, SD

The radar

The Sioux Falls radar (KFSD), 77 km from the middle of the area, began a volume at 15:20 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 river

Written for the forecast point Vermillion River near Wakonda (WKAS2).

Action stage: 13 ft
Minor stage: 14 ft
Moderate stage: 15.5 ft
Major stage: 17 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 06479000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

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

NWS Sioux Falls, SD wrote its last area forecast discussion before this river flood warning went out at Apr 19, 6:35 AM CDT, 3 hours 41 minutes earlier.

Area forecast discussion, Apr 19, 6:35 AM CDT, 3 hours 41 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, Apr 19, 4:10 AM CDT, 6 hours 6 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
410 AM CDT Thu Apr 19 2018

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-200915-
Lyon IA-Osceola-Dickinson-Sioux-O'Brien-Clay IA-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln MN-Lyon MN-Murray-Cottonwood-
Nobles-Jackson-Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-
Brookings-Gregory-Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-
Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-
Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union-
410 AM CDT Thu Apr 19 2018

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, southwest Minnesota, northeast Nebraska,
central South Dakota, east central South Dakota, south central
South Dakota, and southeast South Dakota.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 10:16 AM CDT	River Flood Warning	FSD	Yankton	4 days
Apr 19, 10:16 AM CDT	River Flood Warning	FSD	Turner	4 days
Apr 19, 10:16 AM CDT	River Flood Warning	FSD	Lyon	8 days

Nearby

River Flood Warnings in South Dakota, 2018 Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.