Special Weather Statement, NWS Tucson, AZ

Area Forecast Discussion
National Weather Service Tucson AZ
214 PM MST Fri Aug 27 2021

.SYNOPSIS...
Seasonably hot temperatures are forecast into Monday, but not
quite as hot as the past few days. Daily rounds of mainly
afternoon and evening isolated to scattered thunderstorms will
also occur. An increase in tropical moisture and heavy rainfall
potential is expected by Tuesday, and will coincide with below
normal daytime temperatures.

&&

.DISCUSSION...Thunderstorms have developed across southeast
Arizona this afternoon, some on the strong to severe side with a
good wind gust potential due to drier air below the mid levels.
These storms should last into the evening but diminish during the
overnight hours. Expect thunderstorms to develop each afternoon
through Monday although high temperatures will be a few degrees
cooler than the past few days.

Certainly all eyes are on Nora, which is still a long way from
Arizona. Models continue to forecast a slow advance in our
direction this weekend into next week, but differences between
longer range models also continue when it comes to the track.

The exact track will have a lot to do with how much rainfall we
end up with in southern Arizona in the Tuesday through Thursday
time frame. In any event, there will be the potential for heavy
rain from this tropical system, which could cause a lot of runoff
issues when falling on already saturated ground resulting from our
active monsoon. Stay tuned as details become more clear in the
coming days.

&&

.AVIATION...Valid through 29/00Z.
FEW-SCT clouds at 8k-12k ft MSL (locally BKN during the afternoon
and evening) thru the forecast period. ISOLD-SCT SHRA/TSRA thru
28/06Z and then developing again aft 28/19Z. MVFR conditions and
mountain-top obscurations near TSRA, along with wind gusts up to 45
kts. Otherwise, SFC wind favoring an easterly direction and
generally less than 12 kts. Aviation discussion not updated for TAF
amendments.

&&

.FIRE WEATHER...
Isolated to scattered showers and thunderstorms are expected for
much of the forecast area through the weekend. Moisture is then
expected to increase next week allowing for even better chances of
rainfall, perhaps heavy at times. 20-foot winds will generally be
less than 15 mph when not influenced by thunderstorms and RH values
are expected to remain above critical thresholds.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
Excessive Heat Warning until 8 PM MST this evening for AZZ501-
502-504>507-509.

&&

Public...Drozd
Aviation...Zell
Fire Weather....Zell

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

Special Weather Statement
National Weather Service Tucson AZ
254 PM MST Fri Aug 27 2021

AZZ504-506-514-272230-
Santa Catalina and Rincon Mountains including Mount
Lemmon/Summerhaven-Southeast Pinal County including
Kearny/Mammoth/Oracle-Tucson Metro Area including Tucson/Green
Valley/Marana/Vail-
254 PM MST Fri Aug 27 2021

...A strong thunderstorm will impact portions of northeastern Pima
and southeastern Pinal Counties through 330 PM MST...

At 254 PM MST, Doppler radar was tracking a strong thunderstorm near
Saddlebrooke, or near Catalina, moving west at 10 mph.

HAZARD...Wind gusts of 50 to 55 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Oracle, Saddlebrooke, Biosphere 2 and Oracle Junction.

This includes the following highways...
 Route 77 between mile markers 89 and 102.
 Route 79 between mile markers 92 and 96.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3264 11076 3252 11079 3251 11100 3271 11099
TIME...MOT...LOC 2154Z 111DEG 11KT 3259 11090

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...55 MPH

Special Weather Statement
National Weather Service Tucson AZ
357 PM MST Fri Aug 27 2021

AZZ509-510-280000-
Upper Gila River and Aravaipa Valleys including Clifton/Safford-White
Mountains of Graham and Greenlee Counties including Hannagan Meadow-
357 PM MST Fri Aug 27 2021

...A strong thunderstorm will impact portions of central Graham and
central Greenlee Counties through 500 PM MST...

At 355 PM MST, Doppler radar was tracking an area of strong
thunderstorms from the Clifton area extending to the west into far
eastern Graham County, moving southwest at 15 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Safford, Clifton, Thatcher, Solomon, Morenci, Safford Regional
Airport, Pima, Duncan, Central, York, Three Way and Guthrie.

This includes the following highways...
 Route 70 between mile markers 331 and 378.
 Route 75 between mile markers 381 and 398.
 Route 78 between mile markers 155 and 174.
 Route 191 between mile markers 119 and 185.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3265 10916 3283 10985 3333 10976 3316 10904
      3283 10904
TIME...MOT...LOC 2255Z 043DEG 12KT 3304 10918

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

GL

Special Weather Statement
National Weather Service Tucson AZ
439 PM MST Fri Aug 27 2021

AZZ504-514-280030-
Santa Catalina and Rincon Mountains including Mount
Lemmon/Summerhaven-Tucson Metro Area including Tucson/Green
Valley/Marana/Vail-
439 PM MST Fri Aug 27 2021

...A strong thunderstorm will impact portions of eastern Pima County
through 530 PM MST...

At 439 PM MST, Doppler radar was tracking a strong thunderstorm near
Saguaro National Park East, or 11 miles east of Davis-Monthan Air
Force Base, moving west at 10 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Tucson, Tanque Verde, Vail and Saguaro National Park East.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3223 11057 3208 11054 3204 11065 3206 11077
      3223 11077
TIME...MOT...LOC 2339Z 089DEG 8KT 3214 11067

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Zell

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