Alert archive / Utah / Special Weather Statements in 2018

Special Weather Statement, NWS Salt Lake City, UT

October 3, 2018Wayne County, Utah

NWS Salt Lake City, UT issued this special weather statement at Oct 3, 2018, 9:44 PM MDT for Wayne County, Utah. It was in force for 46 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, 9:44 PM MDT (03:44 UTC)
Expired
Oct 3, 2018, 10:30 PM MDT
In force
46 min
Issued by
NWS Salt Lake City, UT

County Wayne County, UT

The radar

The Cedar City radar (KICX), 157 km from the middle of the area, began a volume at 03:46 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 3.7 hours before the alert went out and 321 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, Flgstf/Belemont, AZ at 00:00Z on 2018-10-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 257 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, Flgstf/Belemont, AZ at 00:00Z on 2018-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939587897117Sfc1 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
257 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1100 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

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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, 8:24 PM MDT, 1 hour 20 minutes earlier.

Area forecast discussion, Oct 3, 8:24 PM MDT, 1 hour 20 minutes before
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Hazardous weather outlook, Oct 3, 6:04 AM MDT, 15 hours 40 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, 6:10 PM MDT, 3 hours 34 minutes before
Special Weather Statement
National Weather Service Salt Lake City UT
610 PM MDT WED OCT 3 2018

UTZ016-019-020-518-040100-
Southern Utah Mountains UT-Southwest Utah UT-
Utah's Dixie and Zion National Park UT-South Central Utah UT-
610 PM MDT WED OCT 3 2018

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN WASHINGTON AND
SOUTHEASTERN IRON COUNTIES UNTIL 700 PM MDT...

At 609 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm 13 miles south of Hurricane, or 16 miles
southeast of St George...moving north at 45 mph.

Penny size hail and winds in excess of 40 mph will be possible.

Locations impacted include...
Washington, Hurricane, La Verkin, New Harmony, Toquerville, Leeds,
Virgin, Springdale, Rockville, Pintura and Kolob Canyon.

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 3700 11314 3701 11346 3749 11348 3747 11296
      3700 11307
TIME...MOT...LOC 0009Z 187DEG 50KT 3697 11332

NC
Special weather statement, Oct 3, 6:36 PM MDT, 3 hours 8 minutes before
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Special weather statement, Oct 3, 6:54 PM MDT, 2 hours 50 minutes before
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Special weather statement, Oct 3, 7:07 PM MDT, 2 hours 37 minutes before
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Special weather statement, Oct 3, 7:27 PM MDT, 2 hours 17 minutes before
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Special weather statement, Oct 3, 9:44 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 3, 6:03 PM MDTSpecial Weather StatementSLCEmery42 min
Oct 3, 6:10 PM MDTSpecial Weather StatementSLCWashington50 min
Oct 3, 6:22 PM MDTSevere Thunderstorm WarningSLCWashington23 min
Oct 3, 6:36 PM MDTSpecial Weather StatementSLCCarbon39 min
Oct 3, 6:54 PM MDTSpecial Weather StatementSLC51 min
Oct 3, 7:07 PM MDTSpecial Weather StatementSLC23 min
Oct 3, 7:27 PM MDTSpecial Weather StatementSLC33 min
Oct 4, 3:25 AM MDTSpecial Weather StatementSLCIron50 min
Oct 4, 4:22 AM MDTSpecial Weather StatementSLCEmery23 min
Oct 4, 4:38 AM MDTSpecial Weather StatementSLCUtah37 min
Oct 4, 4:56 AM MDTSpecial Weather StatementSLCKane34 min
Oct 4, 3:32 PM MDTSpecial Weather StatementSLCDavis, Weber43 min

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.