Alert archive / Utah / Special Weather Statements in 2018

Special Weather Statement, NWS Salt Lake City, UT

October 3, 2018Emery County, Utah

NWS Salt Lake City, UT issued this special weather statement at Oct 3, 2018, 2:18 PM MDT for Emery County, Utah. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Oct 3, 2018, 2:18 PM MDT (20:18 UTC)
Expired
Oct 3, 2018, 2:45 PM MDT
In force
27 min
Issued by
NWS Salt Lake City, UT

County Emery County, UT

The radar

The Grand Junction radar (KGJX), 165 km from the middle of the area, began a volume at 20:20 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 nearest sounding before it

Elko, NV (KLKN), launched 12:00Z, 8.3 hours before the alert went out and 406 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-pSkew-T log-p diagram, Elko, NV at 12:00Z on 2018-10-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Elko, NV at 12:00Z on 2018-10-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
2 J/kg
Mixed-layer CIN
-274 J/kg
Mixed-layer LCL
1270 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

What forecasters said that day

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

NWS Salt Lake City, UT wrote its last area forecast discussion before this special weather statement went out at Oct 3, 10:34 AM MDT, 3 hours 44 minutes earlier.

Area forecast discussion, Oct 3, 10:34 AM MDT, 3 hours 44 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, Oct 3, 6:04 AM MDT, 8 hours 14 minutes before
Hazardous Weather Outlook
National Weather Service Salt Lake City UT
604 AM MDT Wed Oct 3 2018

UTZ001>016-019>021-517-518-WYZ021-041300-
Cache Valley/Utah Portion-Northern Wasatch Front-
Salt Lake and Tooele Valleys-Southern Wasatch Front-
Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys-
Wasatch Mountains I-80 North-Wasatch Mountains South of I-80-
Western Uinta Mountains-Wasatch Plateau/Book Cliffs-
Western Uinta Basin-Castle Country-San Rafael Swell-
Sanpete/Sevier Valleys-West Central Utah-Southwest Utah-
Utahs Dixie and Zion National Park-South Central Utah-
Glen Canyon Recreation Area/Lake Powell-Central Mountains-
Southern Mountains-Southwest Wyoming-
604 AM MDT Wed Oct 3 2018

This Hazardous Weather Outlook is for the western two thirds of
Utah and southwest Wyoming.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms are expected today, then rain
will become more widespread tonight. Locally heavy rain is
expected with some of the stronger showers and thunderstorms.
There remains a potential for flash flooding particularly in prone
areas such as slot canyons, burn scars, normally dry washes,
small streams in steep terrain, and urban areas with poor
drainage.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Another storm system will push a cold front into the area late
Thursday, bringing colder temperatures to the area along with the
potential for accumulating snow across the northern mountains.

Cool and wet weather will then continue for the weekend.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

For more information from NOAA/s National Weather Service visit...
http://weather.gov/saltlakecity

For information on potential road travel impacts visit...
http://www.udottraffic.utah.gov/roadweatherforecast.aspx

In the hours before

Special weather statement, Oct 3, 2:18 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Salt Lake City UT
218 PM MDT WED OCT 3 2018

UTZ010-013-032045-
San Rafael Swell UT-Wasatch Plateau/Book Cliffs UT-
218 PM MDT WED OCT 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL EMERY COUNTY UNTIL
245 PM MDT...

At 217 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm over Green River  near I-70...moving east at 20
mph.

Half inch hail and winds in excess of 40 mph will be possible.

Locations impacted include...
Green River and Elgin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If threatening weather approaches, take shelter in a sturdy building.

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3895 11004 3899 11011 3897 11015 3893 11014
      3890 11023 3906 11031 3912 11012 3900 11015
      3900 11010 3899 11009 3899 11005 3895 11000
TIME...MOT...LOC 2017Z 254DEG 18KT 3900 11019

NC

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 2, 7:25 PM MDTSpecial Weather StatementSLCDavis, Tooele65 min
Oct 2, 7:32 PM MDTSevere Thunderstorm WarningSLCBox Elder28 min
Oct 2, 8:26 PM MDTSpecial Weather StatementSLCCache, Davis, Salt Lake, Weber49 min
Oct 2, 9:17 PM MDTSpecial Weather StatementSLCMorgan, Rich28 min
Oct 2, 9:23 PM MDTAreal Flood AdvisorySLCSalt Lake112 min
Oct 2, 9:42 PM MDTSpecial Weather StatementSLCSalt Lake63 min
Oct 2, 9:56 PM MDTSpecial Weather StatementSLCSummit64 min
Oct 2, 10:01 PM MDTAreal Flood AdvisorySLCUtah119 min
Oct 2, 10:15 PM MDTSpecial Weather StatementSLCUtah, Wasatch60 min
Oct 3, 3:59 AM MDTFlash Flood WatchSLC26 hr

Nearby

Special Weather Statements in Utah, 2018Every special weather statement 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.