Blowing Dust Advisory 7, NWS Tucson, AZ

394 
WWUS75 KTWC 110425
NPWTWC

URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
925 PM MST Sat Jul 10 2021

AZZ504>506-110530-
/O.CAN.KTWC.DU.Y.0007.000000T0000Z-210711T0600Z/
Tucson Metro Area-South Central Pinal County-
Southeast Pinal County-
925 PM MST Sat Jul 10 2021

...BLOWING DUST ADVISORY IS CANCELLED...

The concern for blowing dust had ended with the recent rainfall in
the past few hours. Thus, the advisory has been cancelled. 

$$

AZZ501-502-110600-
/O.CON.KTWC.DU.Y.0007.000000T0000Z-210711T0600Z/
Western Pima County-Tohono O'odham Nation-
Including the cities of Ajo and Organ Pipe Cactus N.M.
925 PM MST Sat Jul 10 2021

...BLOWING DUST ADVISORY REMAINS IN EFFECT UNTIL 11 PM MST THIS
EVENING...

* WHAT...Visibility between one quarter mile and one mile in 
  blowing dust expected.

* WHERE...Western Pima County, Tohono O'odham Nation, Tucson 
  Metro Area, South Central Pinal County and Southeast Pinal 
  County.

* WHEN...From 5 PM this afternoon to 11 PM MST this evening.

* IMPACTS...Hazardous driving conditions due to reduced 
  visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not drive into an area of blowing dust.
Remember, Pull Aside, Stay Alive.

&&

$$

Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson

Area Forecast Discussion
National Weather Service Tucson AZ
155 PM MST Sat Jul 10 2021

.SYNOPSIS...

&&

.DISCUSSION...

Lots of sunshine has allowed energy to build across Southern Arizona
today, with Marana and Tucson already at 105 degrees each.

High resolution models have continued to point to an active late
afternoon start to isolated thunderstorm activity initiating off of
the Mogollon Rim. Some convection has already started in Northern
Greenlee County, moving swiftly southwestward. With PW values at
or above 1.5 inches, heavy localized rainfall will be one of the
main impacts to watch for the rest of today. Even with fast moving
storms, the flash flooding potential does remain, especially over
dry areas and existing burn scars. Additionally, due to the
potential for stronger updrafts and accompanying outflow, blowing
dust will be an issue for parts of Pinal and Pima County through
the evening hours. Therefore, in coordination with WFO Phoenix,
we've issued a Blowing Dust Advisory for those areas valid from
00-06 UTC.

Another interesting wrinkle is the HREF is highlighting areas near
the US/MX border with some interesting updraft helicity
probabilities. If storms do fire in those areas, close attention
will need to be paid to their structure.

Sunday brings another chance for isolated thunderstorm activity,
which will continue well into the middle of next week.

&&

.AVIATION...Valid through 12/00Z.
ISOLD-SCT SHRA/TSRA over the White Mountains this afternoon will
propagate to the southwest through late this evening. Best timing
for thunderstorms affecting KTUS is between 11/01z and 11/07z, and
KOLS between 02-06z. Wind gusts to 50 kts possible near the
strongest TSRA. Otherwise, surface winds less than 12 kts. Aviation
discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Isolated to scattered thunderstorms are again
possible today, forming off the Mogollon Rim this afternoon and
moving to the SW during the evening and overnight hours. Gusty
outflow winds will be the primary concern with these storms. Min RH
values will generally be in the 15-25 percent range for lower
elevations through Monday with very good overnight recoveries before
increasing Tuesday onward. Surface winds will be light and follow
normal daily trends when not influenced by storms.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
Blowing Dust Advisory from 5 PM this afternoon to 11 PM MST this
evening for AZZ501-502-504>506.

&&

Public...Singer
Aviation...Dang
Fire Weather....Dang

Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson