Porterville Weather 
National Weather Service - Local Forecast
Porterville, California
Updated: Friday, May 24 2013 - 11:20 PM PDT
Tonight
Mostly Clear Low: 51 |
Sat
Mostly Clear High: 82 |
Sat night
Mostly Clear Low: 53 |
Sun
Mostly Clear High: 82 |
Sun night
Mostly Clear Low: 53 |
Mon
Mostly Cloudy High: 74 |
Mon night
Chance of Precip Low: 52 |
LOCAL FORECAST
NATIONAL WEATHER SERVICE - National Digital Forecast Database
Updated: Friday, May 24 2013 - 11:20 PM PDT
Location: Porterville, CA
Tonight... Mostly clear. Lows 51 to 60 °F. Light winds from the south up to 5 mph.
Saturday... Mostly sunny. Highs 74 to 82 °F. Light winds from the west-southwest up to 6 mph.
Saturday night... Mostly clear. Lows 53 to 61 °F. Light winds from the southwest up to 5 mph.
Sunday... Mostly sunny. Highs 74 to 82 °F. Light winds from the west-northwest up to 7 mph.
Sunday night... Mostly clear. Lows 53 to 60 °F. Light winds from the south-southwest up to 5 mph.
Monday... Mostly cloudy. Highs 64 to 74 °F. Light winds from the west up to 7 mph.
Monday night... Mostly cloudy with a 20 percent chance of precipitation. Lows 52 to 60 °F. Light winds from the south-southwest up to 7 mph.
Tuesday... Mostly cloudy with a 10 percent chance of precipitation. Highs 63 to 70 °F. Light winds from the south up to 6 mph.
Tuesday night... Mostly cloudy with a 10 percent chance of precipitation. Lows 51 to 66 °F. Light winds from the south-southwest up to 7 mph.
Wednesday... Partly sunny. Highs around 76 °F.
Wednesday night... Partly cloudy. Lows around 51 °F.
Thursday... Partly sunny. Highs around 80 °F.
Thursday night... Partly cloudy. Lows around 52 °F.
Friday... Partly sunny. Highs around 82 °F.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE - San Joaquin Valley / Hanford, CA
Issued: Friday, May 24 2013 - 9:34 PM PDT
Update...pops lowered for Memorial Day except in the Sierra north of Kings Canyon. Max temps lowered slightly on Memorial Day and Tuesday. Weather grid amended for Memorial Day.
Synopsis... Low pressure over the Pacific Northwest is bringing a cool onshore flow to the Central California interior. Temperatures will remain near normal through Sunday. Memorial Day will bring increasing clouds and cooler afternoon temperatures with the possibility of light precipitation mainly over the high Sierra toward evening.
Discussion...temps are generally trending 3 to 7 degrees higher throughout the CWA compared to 24 hrs ago which will put min temp forecasts on target for tonight. An onshore flow this weekend will keep afternoon temperatures from getting any higher than normal in the SJ VLY as ocean-cooled air flows steadily through the sac delta. Already this evening winds have picked up a bit in the northern SJ VLY from modesto northward...and it will not be long before a noticeable reinforcement of marine air is felt in much of the rest of the SJ VLY this evening.
In the bigger picture...little has changed since Tuesday. A storm system anchored over the PAC NW will sit nearly idle through Sunday. The models forecast this storm to slowly deepen during the next 72 hours. As a consequence...the onshore flow will strengthen each of the next 3 days and Memorial Day will become noticeably cooler and increasingly cloudy. Both the ECM and GFS forecast a 300 mb jet max (85 kts) to come across Kern county Sunday afternoon and evening which will likely support potentially strong westerly winds through and below the mountain passes...possibly to advisory levels. Monday afternoon and evening will probably be windier in these areas as the upper level trough deepens and the onshore flow strengthens.
The models differ on exactly how much digging the upper level trough does along the West Coast early next week and how deep the moisture gets. The ECM is substantially deeper with the trough than the GFS and carries a very wet bias. Initially...moisture will be rather shallow when it arrives on Memorial Day so there will be little more than sprinkles in the SJ VLY and adjacent foothills from Fresno county northward with at most a few showers over the high Sierra.
Monday night and Tuesday look more favorable for measurable precip... Especially over the mountains...and it will be cold enough for a small accumulation of snow at this time above 8000 feet. Otherwise... Memorial Day through Tuesday will be much cooler throughout the Central CA interior.
Although a warming trend will occur during the mid to later part of the week...temperatures may still fall shy of normal by next Friday as a dry west to northwest flow aloft prevails over Central CA. This is the kind of pattern that will bring shallow intrusions of marine air into the SJ VLY and produce gusty winds in the Kern county mountains and desert.
Aviation... Vfr conditions will prevail across the Central California interior.
Prev disc... /issued 312 PM PDT Fri may 24 2013/
Discussion...cool dry conditions omega block pattern continues across the US as large closed low center remains nearly stationary over the PAC NW. Additional disturbances will move through the low during the weekend maintaining the trough and onshore flow into Central CA. This will result in cool dry conditions across Central California for much of the weekend. A stronger disturbance will push through Sunday increasing onshore grads across Central CA Sunday afternoon with breezy conditions below the mountain passes of the Kern county mountains and desert.
A stronger trough is expected to move through the area late Monday and Tuesday. The ECM is deeper and further s with the low center as it dives south towards scal. The ECM is also significantly wetter than the GFS. The 12z operational models are in poor agreement atm. However the ensemble means of ec and GFS remain in reasonable agreement. At the moment will be taking a blend of the two ensemble means. Satellite images show a fetch of subtropical moisture with the weather system s of the aleutians progged to move through Central CA Monday night and Tuesday. Models indicate pws of 1-2 standard deviations above normal across Central CA Monday night. Temperatures at 10kft drop to -2c by Tuesday morning. This could lower the snow level to near 8kft with some snow accumulations over the Sierra. Breezy to windy conditions will develop Monday afternoon and Tuesday especially in the Kern county mountains and desert area.
The trough moves through pretty quick and keep US in a strong NW flow through next week which will keep the temps in check as cool onshore flow will prevail.
Aviation... Vfr conditions will prevail across the Central California interior.
Air quality issues... None.
Certainty.
The level of certainty for days 1 and 2 is high. The level of certainty for days 3 through 7 is low.
This information is provided as part of a trial project conducted by the National Weather Service San Joaquin Valley - Hanford. Certainty levels include low...medium...and high. Please visit www.weather.gov/HNX/certainty.php /all lower case/ for additional information and/or to provide feedback.
Climate... records site date hi_max:year lo_max:year hi_min:year lo_min:year
Kfat 05-24 103:1943 64:1916 68:2001 41:1953 kfat 05-25 102:1890 59:1906 68:1890 42:1980 kfat 05-26 103:1974 66:1946 68:1951 40:1953
Kbfl 05-24 107:1982 68:1980 76:1982 41:1916 kbfl 05-25 106:1982 58:2008 77:1982 39:1893 kbfl 05-26 107:1951 68:1998 72:1979 40:1918
HNX watches/warnings/advisories... None.
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE - San Joaquin Valley / Hanford, CA
Issued: Thursday, May 23 2013 - 8:58 PM PDT
Day one...tonight
No hazardous weather is expected at this time.
Days Two through Seven...Friday through Wednesday
No hazardous weather is expected at this time.
Spotter information statement.
Weather spotters are encouraged to report any significant or unusual conditions to the National Weather Service.