Flood in Utah, May 13 to 19, 2017

Area Forecast Discussion
National Weather Service Salt Lake City UT
949 AM MDT Sat May 13 2017

.SYNOPSIS...A weak weather disturbance will push a second cold
front across northern and central Utah today. Another weak
weather disturbance on Monday will lead in a cold Pacific storm
system for the middle and latter portions of the upcoming week.

&&

.DISCUSSION...The dry cold front that swept south across northern
Utah last night has slowed its southeastward advance this
morning. The current position of the front extends from west-
central Utah through central Wyoming. Ahead of the front gusty
southwest winds and warm temps will exist today, while to the
north of the front significantly cooler temps will be the rule.

A second front currently positioned across far northwest Utah will
bring to advance east as the shortwave over north-central Nevada
lifts northeast across far northern Utah/eastern idaho this
afternoon. Light precip trailing the cold front this morning
should increase a bit in areal coverage as the shortwave
increases synoptic lift during the early and midafternoon hours.

Increasing southerly flow aloft on Sunday/Monday will bounce temps
back up around normal to start the week. The next weakening
shortwave arriving Monday night/early Tuesday will be followed by
a transition to unseasonably cold and wet conditions associated
with the cold core upper low settling across the Great Basin
midweek. Widespread precip is expected Wednesday through at least
early Friday, with the potential for heavy snows in the northern
mountains.

&&

.HYDROLOGY...Significantly cooler temperatures behind last nights
cold front will slow the snow melt runoff and allow river flows to
level off and then decrease this weekend. A modest increase in
temps Sunday night/Monday will be followed by substantially cooler
temps for the middle and latter portions of the upcoming week.
Along with the cooler temps there will be widespread
precipitation across the north beginning Wednesday and continuing
into Friday. Any increases in river flows will come from low
elevation rain. The higher elevations will add additional snow,
with the potential for heavy snow at the highest elevations
through the end of the week.

&&

.AVIATION...The stable northerly flow trialing last nights dry cold
front has brought VFR conditions and northwest winds to the
terminal this morning. A second front currently over far northwest
Utah will advance east across the terminal early this afternoon.
This front will bring lower clouds down to around 6-7 kft and will
boost northwest winds this afternoon. Light showers will exist
behind the front, but these showers are not expected to change the
prevailing VFR conditions.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Flood Watch until noon MDT today for UTZ001-007.

WY...None.
&&

CONGER

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

For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php

Hazardous Weather Outlook
National Weather Service Salt Lake City UT
1203 PM MDT Sat May 13 2017

UTZ001>016-019>021-517-518-WYZ021-141300-
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-
1203 PM MDT Sat May 13 2017

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

.DAY ONE...This Afternoon and Tonight

Area streams and rivers will remain high due to snowmelt through
tonight. Keep children and pets away from this hazard. See flood
statements for more information on any potential flooding.

Gusty southwest winds are forecast for the southeast portion of
Utah through this evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Area waterways will continue to run high and fast. Keep children
and pets away from this hazard.

Accumulating snow will be possible across the higher terrain by
midweek.

.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