Subj : MESO: Nws Weather Prediction Center College Park Md
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Jul 17 2025 23:46:55

AWUS01 KWNH 172345
FFGMPD
AZZ000-UTZ000-NVZ000-CAZ000-180515-

Mesoscale Precipitation Discussion 0735
NWS Weather Prediction Center College Park MD
744 PM EDT Thu Jul 17 2025

Areas affected...Southwestern Utah through southern Nevada

Concerning...Heavy rainfall...Flash flooding possible

Valid 172343Z - 180515Z

Summary...Continued slow moving storms with max rainfall rates
exceeding 1"/hr should lead to additional flash flooding through
this evening in the slot canyon region of southern Utah down
through the greater Las Vegas metro.

Discussion...Regional radar depicts isolated clusters of
thunderstorms over southwest Utah (north of Zion NP where earlier
activity was, but now also to the east) and down through southern
Nevada (mainly terrain around Las Vegas). This activity is
downstream of an upper low apparent in water vapor imagery over
the north-central Baja. KESX and KICX both depict max hourly
rainfall around 1.5". These rates can be expected to continue as
SBCAPE remains 1000-1500 J/kg with PW of 1.0" in elevation of
southwest Utah to 1.5" in the Colorado River Basin south of Las
Vegas.

Southerly 850mb flow around 20kt will allow some fresh inflow
while light mean layer flow will keep storm motion slow.
Additional considerable flash flooding impacts are possible over
sensitive burn scars, dry washes, and slot canyons.

Jackson

....Please see https://urldefense.com/v3/__http://www.wpc.ncep.noaa.gov__;!!=
DZ3fjg!7hCoF16MbmkNAjf-6caSwmPdeXSdZ8W7ba5a-Ch-XF-OR_R8ls1MboUZzm3JWx4NSmKQ=
0SrBU25uVqaGkRx1dx4H2TA$  for graphic product...

ATTN...WFO...FGZ...LKN...SLC...VEF...

ATTN...RFC...RSA...STR...NWC...

LAT...LON   38831352 38341168 37041188 36431263 35511342=20
            34831438 35111574 37231608 38411538=20

=3D =3D =3D
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