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Comfort Index: Warm
 Updated14-Aug-2018 9:25am @ 
 
Time of Next Full Update: 9:30 am -  Station Elev: 1469 ft  
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PEPPERRIDGE NORTH VALLEY'S
7 DAY DETAIL FORECAST FOR NORTH PHOENIX, AZ.


National Weather Service Forecast for: 8 Miles NNE Phoenix AZ
Issued by: National Weather Service Phoenix, AZ
Updated: 9:09 am MST Aug 14, 2018

North Phoenix Arizona
 
Today

Today: Sunny, with a high near 103. Breezy, with a west southwest wind 5 to 15 mph.
Sunny then
Sunny and
Breezy
Tonight

Tonight: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 80. Breezy, with a west southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Chance
T-storms and
Breezy
Wednesday

Wednesday: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 99. West southwest wind 5 to 10 mph.
Slight Chance
T-storms
Wednesday
Night
Wednesday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 78. West wind 5 to 10 mph becoming light  after midnight.
Chance
T-storms
Thursday

Thursday: A 30 percent chance of showers and thunderstorms, mainly after 11am.  Partly sunny, with a high near 97. Calm wind becoming west southwest around 5 mph in the afternoon.
Chance
T-storms
Thursday
Night
Thursday Night: A 20 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 80. West wind around 5 mph becoming calm  after midnight.
Slight Chance
T-storms
Friday

Friday: A 10 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 102. Light west wind increasing to 5 to 10 mph in the morning.
Slight Chance
T-storms
Friday
Night
Friday Night: A 10 percent chance of showers and thunderstorms.  Partly cloudy, with a low around 82. West wind 5 to 10 mph.
Slight Chance
T-storms
Saturday

Saturday: Sunny, with a high near 104. West southwest wind 5 to 10 mph.
Sunny


Hi 103 °F

Lo 80 °F

Hi 99 °F

Lo 78 °F

Hi 97 °F

Lo 80 °F

Hi 102 °F

Lo 82 °F

Hi 104 °F


Air Quality Alert
 

Today
 
Sunny, with a high near 103. Breezy, with a west southwest wind 5 to 15 mph.
Tonight
 
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 80. Breezy, with a west southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
 
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 99. West southwest wind 5 to 10 mph.
Wednesday Night
 
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 78. West wind 5 to 10 mph becoming light after midnight.
Thursday
 
A 30 percent chance of showers and thunderstorms, mainly after 11am. Partly sunny, with a high near 97. Calm wind becoming west southwest around 5 mph in the afternoon.
Thursday Night
 
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 80. West wind around 5 mph becoming calm after midnight.
Friday
 
A 10 percent chance of showers and thunderstorms. Mostly sunny, with a high near 102. Light west wind increasing to 5 to 10 mph in the morning.
Friday Night
 
A 10 percent chance of showers and thunderstorms. Partly cloudy, with a low around 82. West wind 5 to 10 mph.
Saturday
 
Sunny, with a high near 104. West southwest wind 5 to 10 mph.
Saturday Night
 
A 10 percent chance of showers and thunderstorms before 11pm. Mostly clear, with a low around 81. West southwest wind 5 to 10 mph.
Sunday
 
Sunny, with a high near 104. Southwest wind 5 to 10 mph.
Sunday Night
 
Mostly clear, with a low around 81. West southwest wind 5 to 10 mph.
Monday
 
Sunny, with a high near 104. Southwest wind 5 to 10 mph.

 

Forecast from NOAA-NWS for 8 Miles NNE Phoenix AZ.




Phoenix, Az - Area Forecast Discussion

Forecast Discussion for PSR NWS Office
000
FXUS65 KPSR 141139
AFDPSR

Area Forecast Discussion
National Weather Service Phoenix AZ
439 AM MST Tue Aug 14 2018

.UPDATE...Updated Aviation Discussion.

&&

.SYNOPSIS...
Monsoon activity will be on the increase starting today, first
affecting high terrain areas and then across the lower deserts
during the overnight hours tonight. A substantial increase in
moisture will bring good chances of showers and thunderstorms on
Wednesday into early Thursday with locally heavy rainfall
possible. Temperatures will dip to below normal midweek but warm
back to above normal as drier conditions move into the region this
weekend.

&&

.DISCUSSION...
The persistent upper level low to our east that brought an
unusually long period of strong mid level northeasterly flow has
finally moved into the Central Plains leaving us under weaker
flow. Moisture levels remain fairly high across much of the
region and with good surface heating today storms will be more
active across the high terrain. Very weak steering flow should
keep these high terrain storms mostly out of the lower deserts
this afternoon and evening, but we can`t completely rule out an
isolated storm or two making into the Phoenix area.

The main forecast concern over the next several days will be a
significant moisture surge associated with an inverted trough
seen moving northward out of Mexico tonight into Wednesday. This
trough is already well evident in water vapor imagery across the
southern Baja area. Quite a bit of storm activity is likely south
of the border later today, possibly reaching into far southern
Arizona as early as late evening. Models are essentially all in
agreement the inverted trough will move into southern Arizona
tonight triggering a strong Gulf surge starting mid to late
evening. Forecast soundings do not show overwhelming CAPE and what
instability is there is elevated. Nevertheless, it is common to
see elevated showers and thunderstorms in this type of situation
and the bulk of the CAMs show activity moving into western Pinal
and southern Maricopa Counties sometime after midnight. We have
raised PoPs to reflect this thinking with 30-50% PoPs across
south-central Arizona late tonight. The main threat for tonight
will be locally heavy rainfall with slow moving storms.

The strong moisture advection into the area tonight into Wednesday
will result in PWATs mostly between 1.6-2.0" and quite a bit of
cloudiness. We may have a difficult time destabilizing on
Wednesday and forecast soundings show an inversion layer which may
keep storm activity isolated through the afternoon hours. Current
thinking is showers and thunderstorms should mainly be confined
to high terrain areas until the evening hours when the inversion
layer is shown to erode. Am anticipating scattered showers and
thunderstorms Wednesday evening through much of the overnight
hours. This will likely be the best time frame for heavy rainfall
and any potential flooding. Late Wednesday night, models show the
high center shifting well to the east with unidirectional
southwesterly flow developing. This is a change and will likely
cut back on storm activity on Thursday and Friday. Have cut back
on PoPs a bit for Thursday, but they are still between 15-30%.

The southwesterly flow will gradually bring in drier air into the
weekend with lower and lower chances for storms. Starting Friday,
it may be difficult to see any storms over the deserts under the
weak westerly steering flow and drying conditions. From Friday
into Saturday and high center quickly shifts westward from New
Mexico to off the southern California coast. This should bring in
even drier air out of the north with PWATS dropping well below
1.5". This drier air and 500mb heights around 594dm will allow
high temperatures to creep upwards late this week into the
weekend. The warmest desert locations could see 110 degrees by
Sunday with 105-107 anticipated for the Phoenix metro. Storm
chances this weekend and likely into early next week will
generally be confined to the high terrain of far eastern Arizona.

&&

.AVIATION...
South-Central Arizona including KPHX, KIWA, and KSDL:

An active sea breeze today will maintain moderate westerly winds
across the area near 8-12kt with gusts of 15-20kt developing by
early afternoon. For late tonight nocturnal thunderstorms are
expected to move into the vicinity around 08-09Z from the southeast
or east with very breezy southerly outflow winds gusting to
20-30kt. Areas of blowing dust and reduced visibilities are also
possible near the storms although not to the extent of including
them in the TAFS. Otherwise skies will be clear to mostly clear
with FEW-SCT decks from 9-18kft for today. Then late tonight with
the storms expect BKN-OVC CIGS from 12-18kft.

Southeast California/Southwest Arizona including KIPL and KBLH:

Expect light to moderate diurnal and southerly winds for today near
6-12kt.  Breezy southerly winds are expected for KBLH by mid morning
with gusts of 16-20kt. Some breezy sundowner westerly winds can also
be expected to develop at KIPL by early this evening with gusts up
to 24kt. Otherwise skies will be mostly clear with FEW-SCT decks
from 10-15kft.

Aviation Discussion not updated for amended TAFs.

&&

.FIRE WEATHER...
Thursday through Monday:
Elevated moisture levels will continue into Thursday for all
districts resulting in enhanced chances for thunderstorms and
wetting rains. Some locally heavy rain will be possible,
especially throughout central Arizona. Slightly drier air will
slowly push into the region by the weekend, but afternoon storms
will still be possible over higher terrain areas. Throughout the
period wind speeds will be typical for mid summer with the usual
afternoon breezes. Temperatures will start out below average on
Thursday and then gradually warm near to slightly above normal
Friday through Monday.

&&

.SPOTTER INFORMATION STATEMENT...
Spotters should follow standard reporting procedures.

&&

.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...None.
CA...None.
&&

$$

DISCUSSION...Kuhlman
AVIATION...Sawtelle
FIRE WEATHER...Wilson/MO

NWS PSR Office Area Forecast Discussion






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 Pepper Ridge North Valley Random Weather Facts

HUMIDEX
Definition Humidex - Over the years, several measures have been proposed to relate various combinations of temperature and humidity into a single number to approximate what hot, humid weather feels like to the average person. Of these, humidex is the one most familiar to Canadians. Humidex was introduced into Canada in 1965. The index is a summer analogue of the wind chill factor in that it is an equivalent air temperature. Air of a given temperature and humidity is equated in comfort to air of a higher temperature that has a negligible moisture content. Comfort is quite subjective and largely dependent on the age and health of the individual. Weather conditions causing prickly heat in an infant may result in heat cramps in a teenager, heat exhaustion in a middle-aged and heat stroke in a senior. Humidex is also limited as an overall hot-weather comfort index because it does not consider other factors such as pressure, wind speed, precipitation, sunshine or pollen.

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