977
FNUS75 KSLC 201114
FWSSLC

Spot Forecast for Last Chance RX...USFS
National Weather Service Salt Lake City UT
514 AM MDT Thu Jun 20 2024

Forecast is based on ignition time of 0600 MDT on June 20.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...While moisture will increase slightly by late this
afternoon, most of the higher moisture content air will remain off
to the south and east today. The burn site will be on the western
fringes of the potential for gusty outflow thunderstorm winds and
isolated dry lightning this afternoon as well, with most of this
activity remaining east of the area through this evening. However,
moisture will increase substantially late tonight and Friday
with scattered showers and thunderstorms expected Friday, especially
in the afternoon. This activity will be capable of producing heavy
rain, hail and strong outflow winds. As is the case with convection,
there is a wide range in possible precipitation amounts, ranging
from nothing on the low end to as much as 1.5" on the high end.
Regardless of whether it rains or not, significant humidity
recovery will be observed on Friday.

.TODAY...

Sky/weather.........Mostly sunny (5-15 percent cloud cover).
CWR.................0 percent.
Chance of pcpn......0 percent.
LAL.................1.
Max temperature.....Around 70.
Min humidity........16-18 percent.
Wind (20 ft)........Downslope/downvalley winds 3-8 mph becoming
                    south winds 6-16 mph between 0900-1000 then
                    becoming southwest 8-16 mph around 1300.
                    Gusts up to 30 mph in the afternoon.
Clearing index......1000+.
Haines Index........6.

.TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent cloud cover).
                    Slight chance of showers and thunderstorms
                    early in the evening. Slight chance of showers
                    and thunderstorms overnight.
CWR.................0 percent.
Chance of pcpn......20 percent.
LAL.................2 until 2100, then 1 until 2400, then 2 until
                    0300, then 1.
Min temperature.....46-48.
Max humidity........87-89 percent.
Wind (20 ft)........Southwest winds 8-15 mph with gusts to around
                    28 mph becoming south to southeast 6-13 mph
                    between 2100-2200. Gusty and erratic winds
                    expected near showers and thunderstorms.
Haines Index........6.

.FRIDAY...

Sky/weather.........Partly sunny (60-70 percent cloud cover) then
                    becoming mostly cloudy (80-90 percent cloud
                    cover). Chance of rain showers in the morning.
                    Chance of thunderstorms late in the morning,
                    then rain showers with thunderstorms likely in
                    the afternoon.
CWR.................65 percent.
Chance of pcpn......80 percent.
LAL.................1 until 0900, then 4 until 1200, then 5.
Max temperature.....62-64.
Min humidity........53-55 percent.
Wind (20 ft)........Southeast winds 8-13 mph becoming south around
                    0900 then becoming southwest 9-16 mph in the
                    afternoon with gusts around 28 mph. Gusty and
                    winds expected near showers and thunderstorms.
Clearing index......860.
Haines Index........3.

$$
Forecaster...ADeSmet
Requested by...Trevor Johnson
Type of request...PRESCRIBED
.TAG 2416423.0/SLC
.DELDT 06/20/24
.FormatterVersion 2.0.0
.EMAIL Trevor.johnson@usda.gov