St. George, UT...Kingman, AZ...Cedar City, UT...Washington, UT...Hurricane, UT...
ZCZC SPCFWDDY1 ALL
FNUS21 KWNS 191637
Day 1 Fire Weather Outlook
NWS Storm Prediction Center Norman OK
1137 AM CDT Thu Sep 19 2019
Valid 191700Z - 201200Z
...CRITICAL FIRE WEATHER AREA FOR FAR SOUTHEAST NEVADA...NORTHWEST
ARIZONA...AND A LARGE PORTION OF UTAH...
No changes are needed to the ongoing forecast of critical fire
weather conditions across portions of southeastern Nevada,
northwestern Arizona, and Utah (see previous discussion below).
Strong insolation ahead of an approaching upper-level trough has
already resulted in some locations reporting RH values this morning
below 20% along with wind gusts approaching 30 mph. As boundary
layer mixing continues through the afternoon, widespread critical
fire weather conditions are expected across the region with the
potential for strong wind gusts (i.e., approaching 50 mph).
.PREV DISCUSSION... /ISSUED 1246 AM CDT Thu Sep 19 2019/
A strong mid-level jet will spread across the Great Basin today
ahead of a mid-level closed low. Some of these strong winds are
expected to transport toward the surface through deep vertical
mixing. Surface winds could be quite strong (30 to 35 mph) in
northwest Arizona and southwest Utah with some gusts approaching 50
mph. In addition, this pre-frontal airmass will feature dry surface
conditions and RH values around 10 to 20 percent. 20 to 30 mph
surface winds are expected farther northeast into most of Wyoming
where relative humidity will also be in the 15 to 20 percent range.
Isolated critical conditions will be possible in this region, but no
critical area was added here due to borderline relative humidity and
relatively sparse fuels.
...Please see www.spc.noaa.gov/fire for graphic product...
CLICK FOR DAY 1 FIREWX AREAL OUTLINE PRODUCT (KWNSPFWFD1)