Flash Flood Warning 79, NWS Tucson, AZ

089 
WGUS75 KTWC 080336
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
836 PM MST Wed Aug 7 2024

AZC019-023-080545-
/O.CON.KTWC.FF.W.0079.000000T0000Z-240808T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Santa Cruz AZ-
836 PM MST Wed Aug 7 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM MST THIS 
EVENING FOR SOUTHEASTERN PIMA AND NORTH CENTRAL SANTA CRUZ 
COUNTIES...

At 836 PM MST, Doppler radar and automated rain gauges indicated 
that thunderstorms west of Interstate 19, near Amado and Green 
Valley, have diminished in intensity. Between 1 and 2 inches of rain 
have fallen. Flash flooding has been reported on Arivaca road west 
of Interstate 19.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar and automated gauges.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Green Valley, Amado and Arivaca Junction.

This includes Interstate 19 between mile markers 28 and 37.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3169 11124 3183 11119 3187 11108 3182 11099
      3177 11101 3171 11103 3169 11109 3166 11117

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

EDWARDS

318 
WGUS75 KTWC 080544
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1044 PM MST Wed Aug 7 2024

AZC019-023-080554-
/O.EXP.KTWC.FF.W.0079.000000T0000Z-240808T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Santa Cruz AZ-
1044 PM MST Wed Aug 7 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM MST THIS EVENING FOR 
SOUTHEASTERN PIMA AND NORTH CENTRAL SANTA CRUZ COUNTIES...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a threat. Please continue to heed remaining road closures.

&&

LAT...LON 3169 11124 3183 11119 3187 11108 3182 11099
      3177 11101 3171 11103 3169 11109 3166 11117

$$

GLZ

Area Forecast Discussion
National Weather Service Tucson AZ
104 PM MST Wed Aug 7 2024

.SYNOPSIS...Scattered showers and thunderstorms each day into this
weekend with the exception of Saturday which could see reduced
coverage. Storms will have the potential for heavy rainfall and
strong wind gusts. Temperatures cool to near normal levels today
and Thursday, then warm up to above normal levels Friday through
the weekend.

&&

.DISCUSSION...Temperatures are 4-10 degrees less than this time
yesterday thanks to the cloud cover in place over some of the CWA.
The upper level low is now situated over western Sonora and the
Gulf of California. Storms have already begun to form over the
Huachucas, Mt Graham, and the White Mountains. Expect this
activity to continue with storms mainly confined to the higher
terrain from Tucson eastward over the next couple of hours with
storms then moving into the lower deserts. Areas with lingering
mid-level clouds such as Tucson could have a late start or
struggle some with storm formation. However ingredients for storms
are still in place with MLCAPE of 1000-2000 J/kg, PWAT ranging
from 1.25"-1.75", and moderate 0-6 km shear of 15-20 kts. Storms
will be capable of strong winds and heavy rainfall with heavy
rainfall expected to be the bigger threat. DCAPE values are only
around 700 J/kg. HREF rainfall probabilities are highlighting
areas just south of the Tucson metro, Santa Cruz County, and
western Cochise County for the greatest chance of heavy rainfall.
Three hour probability matched mean for greater than 1" of QPF is
70 percent for these areas this afternoon and evening. Isolated
amounts of 2" will also be possible. Storms will also be slower
moving with steering flow around 5-10 knots, which will aid the
heavy rain threat.

CAMs aren't showing much if any nocturnal showers or thunderstorms
which should leave Thursday with more insolation than today.
Moisture and instability will be similar to today, so expect
scattered thunderstorms mainly from central Pima County eastward
during the afternoon and evening. The HREF favors eastern Pima
County, Santa Cruz County, and Cochise County to be the most
active. The upper level low will sit over the northern portion of
the Gulf of California, which is a little further east than
previous model runs and could slightly enhance the 500 mb flow.
Storms will be capable of strong winds and heavy rainfall leading
to localized flash flooding. The HREF is highlighting Cochise
County to see the best chances for heavy rainfall with the 3 hour
QPF PMM showing a 10 percent chance for 3 inches of rain and 70
percent for 1".

Friday eastern areas begin to lose moisture, which could lead to
reduced storm coverage especially if the atmosphere is worked over
from Thursday's storms. But areas from Benson westward could still
see storms. Temperatures also begin to increase as high pressure
becomes centered over New Mexico. Saturday the upper level low
moves west over Baja California and models further dry out
southeast Arizona, which will lead to further reduced storm
coverage. High temperatures will also increase to 4-7 degrees
above normal.

Sunday into early next week moisture returns to normal levels with
daily afternoon and evening thunderstorms expected. Mid-week a
possible pattern change looks to take place with a trough setting
up on the West Coast. Ensembles still differ with how far south
the trough extends which will determine whether southeast Arizona
switches from southeasterly flow to drier southwesterly flow.

&&

.AVIATION...Valid through 09/00Z.
SCT-BKN clouds at 6k-9k ft AGL and BKN-OVC clouds AOA 15k ft AGL
thru this evening then gradual clearing overnight into the
morning. SCT SHRA/TSRA thru 08/03Z, slowly diminishing
thereafter. MVFR conditions expected near TSRA, with VSBY
restrictions, wind gusts to 40+ kts, heavy rain and mountain
obscurations. Outside of thunderstorm wind gusts, wind speeds will
be less than 12 kts, favoring an SWLY through NWLY direction in
the afternoon and early evening hours and variable in direction at
other times. Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Isolated to scattered mainly afternoon and evening
showers and thunderstorms are expected through the upcoming
weekend with a possible down day Saturday. Min RH values will be
in the 25-40 percent range in the valleys through Thursday (and
higher in the mountains), decreasing to 20-30 percent Friday
through the weekend. Outside of thunderstorm outflow winds,
20-foot winds will generally be 15 mph or less, with
afternoon/early evening gusts to 20-25 mph and light winds
overnight.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
None.
&&

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