ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 221650
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1150 AM CDT Sun Jul 22 2018
Valid 221700Z - 231200Z
12Z soundings from Elko NV and Salt Lake City UT show precipitable
water values of 0.95 and 1.16 inch, respectively. Visible satellite
imagery also shows considerable cloudiness from northeastern
NV/northern UT into western WY, which is likely related to prior
convection and a weak shortwave trough rotating northeastward around
an upper ridge centered over the southern High Plains and Southwest.
The combination of unfavorable precipitable water values, widespread
cloudiness limiting boundary layer warming/drying this afternoon,
and modest mid-level winds suggests that isolated dry thunderstorms
will be unlikely today. Have therefore removed the isolated dry
thunderstorm delineation for this region.
A separate isolated dry thunderstorm area remains generally
unchanged for parts of northern CA into southern OR and far
northwestern NV. No changes have been made to the elevated area
across parts of the Snake River Valley in southern/eastern ID. See
the previous discussion below for more information.
.PREV DISCUSSION... /ISSUED 0138 AM CDT Sun Jul 22 2018/
A weak ridge will be present across much of the western CONUS on
Sunday with relatively weak mid-level winds across much of the area.
Monsoon moisture is present across much of the Great Basin,
Southwest, and central Rockies, with much drier air into the Pacific
Northwest. RH values will drop into the 10 to 15 percent range
across much of eastern Oregon and southern Idaho. RH values may drop
into the single digits in portions of southern Idaho. Afternoon
sustained surface winds are expected to increase to around 15 mph in
the Snake River Valley during the afternoon hours. Therefore, an
elevated area is highlighted.
In addition, dry thunderstorms are possible from northern California
into southern Oregon and northwest Nevada as well as northeast
Nevada across northern Utah and into southwest Wyoming. Have kept a
space between these two areas as there appears to be a convective
lull between the two locations. Slow storm motions and PWAT values
approaching one inch in some areas will likely lead to some of the
storms being wet, but very dry fuels are in place, and some drier
storms are expected.
...Please see www.spc.noaa.gov/fire for graphic product...
CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)