Alert archive / South Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 182, NWS Rapid City, SD

July 18, 2001Perkins County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 18, 2001, 10:25 PM MDT for Perkins County, South Dakota. It was in force for 65 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 18, 2001, 10:25 PM MDT (04:25 UTC)
Expired: Jul 18, 2001, 11:30 PM MDT
In force: 65 min
Issued by: NWS Rapid City, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Perkins County, SD

The radar

The Rapid City radar (KUDX), 154 km from the middle of the area, began a volume at 04:27 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.

What was reported inside it

Time	Report	Where	Remark
Jul 18, 10:49 PM MDT	Thunderstorm Wind 61 E	Lemmon, SD

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 18, 7:45 PM MDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 18, 7:45 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 4.4 hours before the alert went out and 161 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: 1170 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 2287 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 18, 2:30 PM MDT, 7 hours 55 minutes earlier.

Area forecast discussion, Jul 18, 2:30 PM MDT, 7 hours 55 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
230 PM MDT WED JUL 18 2001

LATEST SFC ANALYSIS SHOWS NRLY STNRY LOW OVER CENT SD. A TROF
EXTENDS ACROSS S-CENT SD FM THIS LOW. SATELLITE IMAGES REVEAL TCU
OVER BLK HLS HAS DISSIPATED WHILE ISOLD CU TRYING TO GET GOING OVER
NE WY. KUDX PPINE.

MODELS INITIALIZE WELL AND SHOW PRETTY GOOD AGREEMENT. ETA HAS BEEN
SHOWING BEST RUN TO RUN CONSISTENCY. CAA AND DRYING HAS SUPPRESSED
CONVECTIVE DEVLPMNT OVER WRN SD TDY. TWO S/WVS SEEN IN WV IMAGES ONE
OVER WA AND ANOTHER WEAK ONE OVER NV. MODELS BRING A WEAK WAVE
ACROSS NRN WY TONIGHT. THIS WILL BRING A GOOD PUSH OF THETA-E
ADVECTION ACROSS NE WY AND NW SD. FAIRLY STEEP LAPSE RATES...SO WE
MAY SEE SOME ELEVATED CONVECTION LATE EVE/OVERNIGHT IN WRN AND NRN
ZONES. THE STRONGER WA WAVE WILL PUSH THROUGH TOMORROW COINCIDENT
WITH AFTERNOON HEATING AND MIXING. THIS ENERGY WILL SKIRT WRN AND
NRN ZONES AND LIKELY FORM AN MCS OVER ND THUR EVE. SO WILL
ANTICIPATE SCT AFTERNOON TSTMS W AND N...WITH ISOLATED ACTIVITY
ELSEWHERE. HEADING INTO EXTENDED PERIODS...UPPER LEVEL RIDGE OVER S
CENT U.S. AND LOW OVER SW CANADA WILL KEEP THIS SAME PATTERN GOING.
LITTLE CHANGE IN TEMPS OTHER THAN THE REBOUND THE NEXT FEW DAYS FROM
TODAYS ROBUST CAA.

AVN GUIDANCE TOO COLD AND WET. PREFER THE WARMER AND DRIER NGM FOR
EARLY PERIODS. GUIDANCE COMES INTO BETTER AGREEMENT IN LATER PERIODS
AND LOOKS REASONABLE.

.UNR...NONE.

99

In the hours before

Local storm report, Jul 18, 9:44 PM MDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
944 PM MDT WED JUL 18 2001

TIME(MDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0850 PM    CAMP CROOK                SD   58 MPH TSTM GUST
07/18/01   HARDING

0855 PM    13 WSW LADNER             SD   80 MPH TSTM GUST
07/18/01   HARDING                        WINDOWS BLOWN OUT OF
                                          HOUSE

0900 PM    2 E LADNER                SD   60 MPH TSTM GUST
07/18/01   HARDING

0900 PM    2 E LADNER                SD   .75 INCH HAIL
07/18/01   HARDING

0907 PM    BUFFALO ARPT              SD   75 MPH TSTM GUST
07/18/01   HARDING

Local storm report, Jul 18, 9:58 PM MDT, 27 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 8:27 PM MDT	Severe Thunderstorm Warning	UNR	Harding	63 min
Jul 18, 9:25 PM MDT	Severe Thunderstorm Warning	UNR	Harding	50 min
Jul 18, 9:34 PM MDT	Severe Thunderstorm Warning	UNR	Perkins	56 min
Jul 19, 3:43 PM MDT	Severe Thunderstorm Warning	UNR		32 min
Jul 19, 4:11 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson	49 min
Jul 19, 4:16 PM MDT	Severe Thunderstorm Warning	UNR		44 min
Jul 19, 4:55 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	50 min
Jul 19, 5:13 PM MDT	Severe Thunderstorm Warning	UNR	Jackson	47 min
Jul 19, 5:27 PM MDT	Severe Thunderstorm Warning	UNR	Harding	48 min
Jul 19, 5:41 PM MDT	Severe Thunderstorm Warning	UNR	Haakon	64 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.