Alert archive / South Dakota / Flash Flood Warnings in 2018

Flash Flood Warning 8, NWS Rapid City, SD

July 17, 2018Custer County, Pennington County, South Dakota

NWS Rapid City, SD issued this flash flood warning at Jul 17, 2018, 3:43 PM MDT for Custer County, Pennington County, South Dakota. It was in force for 3 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 17, 2018, 3:43 PM MDT (21:43 UTC)
Expired: Jul 17, 2018, 6:45 PM MDT
In force: 3 hr
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Flood severity: None

Counties Custer County, SD, Pennington County, SD

The radar

The Rapid City radar (KUDX), 40 km from the middle of the area, began a volume at 21:47 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

Rapid City, SD (KRAP), launched 12:00Z, 9.7 hours before the alert went out and 33 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: 859 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1217 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 36 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Rapid City, SD wrote its last area forecast discussion before this flash flood warning went out at Jul 17, 1:52 PM MDT, 1 hour 51 minutes earlier.

Area forecast discussion, Jul 17, 1:52 PM MDT, 1 hour 51 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, Jul 17, 6:22 AM MDT, 9 hours 21 minutes before

Hazardous Weather Outlook
National Weather Service Rapid City SD
622 AM MDT Tue Jul 17 2018

SDZ012-024>031-041-042-072>074-WYZ054>058-071-181300-
Butte-Northern Black Hills-Northern Foot Hills-Rapid City-
Southern Foot Hills-Central Black Hills-Southern Black Hills-
Custer Co Plains-Pennington Co Plains-Fall River-Oglala Lakota-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Hermosa Foot Hills-Northern Campbell-Southern Campbell-
Western Crook-Wyoming Black Hills-Weston-Northeastern Crook-
622 AM MDT Tue Jul 17 2018

This Hazardous Weather Outlook is for portions of northwestern
South Dakota...southwestern South Dakota...the Black Hills of
South Dakota...northeast Wyoming...and the Black Hills of
Wyoming.

.DAY ONE...Today and Tonight

Scattered thunderstorms are possible late this afternoon through
tonight. Some severe storms are possible, with large hail and
damaging winds the primary threats. Locally heavy rainfall will
also be possible this afternoon and overnight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Showers and thunderstorms will persist through Wednesday. Severe
thunderstorms are not anticipated at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

SDZ001-002-013-014-032-043-044-046-047-049-181300-
Harding-Perkins-Northern Meade Co Plains-Ziebach-Haakon-Jackson-
Bennett-Mellette-Todd-Tripp-
622 AM MDT Tue Jul 17 2018 /722 AM CDT Tue Jul 17 2018/

This Hazardous Weather Outlook is for portions of western South
Dakota.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms are possible tonight. Severe
thunderstorms are not anticipated at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Showers and thunderstorms will persist on Wednesday. Strong to
severe thunderstorms will be possible across central portions of
South Dakota.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

In the hours before

Local storm report, Jul 17, 2:43 PM MDT, 1 hour 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>

Local storm report, Jul 17, 3:25 PM MDT, 18 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>

Local storm report, Jul 17, 3:27 PM MDT, 16 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>

Local storm report, Jul 17, 3:28 PM MDT, 15 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>

Local storm report, Jul 17, 3:34 PM MDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
334 PM MDT TUE JUL 17 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     HAIL             3 ESE HILL CITY         43.92N 103.51W
07/17/2018  E0.88 INCH       PENNINGTON         SD   NWS EMPLOYEE

            NICKEL SIZED HAIL FOR THE LAST 15 MINUTES

&&

KDS

Local storm report, Jul 17, 3:43 PM MDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
343 PM MDT TUE JUL 17 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0322 PM     HAIL             3 ENE HILL CITY         43.95N 103.52W
07/17/2018  M1.25 INCH       PENNINGTON         SD   PUBLIC

&&

KCLARK

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 16, 6:11 PM MDT	Special Weather Statement	UNR	Bennett	49 min
Jul 16, 6:44 PM MDT	Special Weather Statement	UNR	Todd	31 min
Jul 16, 7:08 PM MDT	Special Weather Statement	UNR	Todd	52 min
Jul 17, 3:02 AM MDT	Flash Flood Watch	UNR	Butte, Custer, Fall River, Lawrence, Meade, Oglala Lakota and 1 more	20 hr
Jul 17, 11:50 AM MDT	Special Weather Statement	UNR	Lawrence	25 min
Jul 17, 12:13 PM MDT	Special Weather Statement	UNR	Lawrence	47 min
Jul 17, 12:22 PM MDT	Special Weather Statement	UNR	Lawrence	23 min
Jul 17, 12:35 PM MDT	Special Weather Statement	UNR	Lawrence	25 min
Jul 17, 12:44 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	29 min
Jul 17, 2:16 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Pennington	59 min
Jul 17, 2:57 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	63 min
Jul 17, 3:21 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Pennington	54 min
Jul 17, 3:58 PM MDT	Special Weather Statement	UNR	Pennington	47 min
Jul 17, 4:14 PM MDT	Severe Thunderstorm Warning	UNR	Custer	61 min
Jul 17, 4:46 PM MDT	Special Weather Statement	UNR	Oglala Lakota	44 min
Jul 17, 4:58 PM MDT	Severe Thunderstorm Warning	UNR	Custer	62 min
Jul 17, 5:39 PM MDT	Severe Thunderstorm Warning	UNR	Oglala Lakota	66 min
Jul 17, 3:55 PM MDT	Special Weather Statement	UNR	Campbell	50 min
Jul 17, 4:04 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	56 min
Jul 17, 4:31 PM MDT	Special Weather Statement	UNR	Crook	44 min
Jul 17, 4:46 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	25 min
Jul 17, 4:59 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	61 min
Jul 17, 5:07 PM MDT	Severe Thunderstorm Warning	UNR	Crook	68 min
Jul 17, 5:18 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	42 min
Jul 17, 5:22 PM MDT	Severe Thunderstorm Warning	UNR	Crook	68 min
Jul 17, 5:29 PM MDT	Flash Flood Warning	UNR	Crook	3 hr
Jul 17, 5:59 PM MDT	Severe Thunderstorm Warning	UNR	Campbell, Weston	61 min

Nearby

Flash Flood Warnings in South Dakota, 2018 Every flash 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.