Special Weather Statement, NWS Tucson, AZ

Area Forecast Discussion
National Weather Service Tucson AZ
215 PM MST Wed Aug 23 2017

.SYNOPSIS...Expect scattered thunderstorms into this evening. Some
storms will produce heavy rain, especially east and south of
Tucson. Gusty winds may produce areas of blowing dust northwest
of Tucson late into early evening. Isolated to scattered
thunderstorms will then prevail Thursday into early next week,
with the greatest thunderstorm coverage mainly east to south of
Tucson.

&&

.DISCUSSION...Scattered thunderstorms should continue into this
evening. The overall evolution of development has closely
resembled a blend of mesoscale models. Storm cluster over Santa
Cruz County figures to push a boundary northwestward/down the
terrain. This could enhance storms ongoing over central Pima
County and also produce some areas of blowing dust. Will keep
blowing dust advisory going into early this evening. Latest rapid
refresh model shows the peak storm coverage around 6 pm. Some of
these storms could produce heavy rain due to slow and erratic
movement. Showers and storms could linger until at least midnight
east of Tucson, closest to upper level support.

Models indicate mid level ridging/high pressure starts to shift
into northern AZ as early as Thursday with resultant north to
northeast mid level flow over SE AZ. While storm coverage will not
be as widespread as today, enough moisture and instability will
remain in place for isolated to scattered storms, especially east
of Tucson.

As the high becomes anchored to our north, easterly flow will
keep enough moisture in place for daily rounds of isolated to
scattered storms into early next week. While eastern locales will
be most favored, any disturbance moving from east to west in the
flow could help storms to progress into the western deserts on a
given day. Timing of such an occurrence is difficult to pinpoint
however.

High temperatures will generally remain above seasonal averages,
but fluctuate depending on thunderstorm timing.

&&

.AVIATION...Valid thru 25/00Z.
Scattered to numerous TSRA through 24/03z with MVFR cigs/vsbys in
strongest storms. Brief wind gusts 35-45 kts may produce BLDU
northwest of KTUS. Isolated -TSRA/-SHRA mainly east of KTUS late
tonight into early Thursday morning, then scattered TSRA east of
KTUS Thu afternoon. Otherwise, surface wind less than 12 kts.
Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...An easterly flow will develop by Friday keeping
enough moisture around southeast Arizona for daily rounds of
thunderstorms into next week. Coverage will vary from day to day
but areas east of Tucson will be most favored overall. 20 foot
winds will remain light except in the vicinity of thunderstorms.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
Blowing Dust Advisory until 7 PM MST this evening for
AZZ501-502-504-505.

&&

KD

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Special Weather Statement
National Weather Service Tucson AZ
241 PM MST WED AUG 23 2017

AZZ503-504-232215-
Upper Santa Cruz River and Altar Valleys including Nogales-Tucson
Metro Area including Tucson/Green Valley/Marana/Vail-
241 PM MST WED AUG 23 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PIMA AND NORTH
CENTRAL SANTA CRUZ COUNTIES UNTIL 315 PM MST...

At 240 PM MST, strong thunderstorms were located 9 miles northwest
of Tubac, moving northwest at 15 mph.

Winds in excess of 40 mph and nickel sized hail will be possible
with this storm.

Locations impacted include...
Green Valley, Tubac, Junction Of Highway 286 And Arivaca Road, Amado
and Arivaca Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3178 11097 3152 11117 3166 11154 3207 11120
TIME...MOT...LOC 2140Z 118DEG 12KT 3170 11118

French

Special Weather Statement
National Weather Service Tucson AZ
333 PM MST WED AUG 23 2017

AZZ507-508-512-513-232330-
Upper San Pedro River Valley including Sierra
Vista/Benson-Dragoon/Mule/Huachuca and Santa Rita Mountains including
Bisbee/Canelo Hills/Madera Canyon-Chiricahua Mountains including
Chiricahua National Monument-Eastern Cochise County Below 5000 Feet
including Douglas/Willcox-
333 PM MST WED AUG 23 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN COCHISE COUNTY UNTIL 430
PM MST...

At 332 PM MST, A line of strong thunderstorms was located along a
line extending from 11 miles southeast of Rodeo, NM to 12 miles
southeast of Bisbee. Movement was northwest at 35 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Douglas, Bisbee, Mcneal, Chiricahua National Monument, Rucker
Canyon, Portal, Junction Of Highways 80 And 90, Bisbee-Douglas
Airport, Pirtleville and Elfrida.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with these storms, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3133 10979 3156 11020 3207 10929 3190 10905
      3133 10905
TIME...MOT...LOC 2232Z 124DEG 31KT 3171 10890 3127 10979

French