Text Box: This forecast was made possible by generous funding from the Lake County Winegrape Commission and American AgCredit.
 
      Lake County Forecast       phone 530-342-1700 
  www.westernwx.com/Lakeco email: forecaster@westernwx.com 
        Thursday September 2, 2010 issued 7:30am   by Forecaster Chris Link
Text Box: HIGHLIGHTS: Warm temperatures for today and tomorrow with several areas over the century mark. Cooler temperatures should arrive this weekend with significantly cooler weather for the middle of next week.
Text Box: Short Term Weather Discussion: Upper-level ridging has set up over the Desert SW and extends over California which will lead to another day that is generally cloud free. Temperatures today are expected to warm several degrees from yesterday as the ridge gets closer to being over the Golden State. This will result in most locations in Lake County reaching the upper 90's to lower 100's. Similar conditions are expected for tomorrow ending the work week on a warm note but cooler temperatures should arrive for the weekend.
SHORT TERM FORECAST SPECIFICS
Weather Max/Min Dew Pts POPs Amounts Winds
TODAY (am) Sunny 95-102 45-55 0% none NE-Var 3-15
(pm) SW-W 3-12
TONIGHT (vals) Clear 50-62 45-55 0% none Var 0-10
(hills) 69-77 W 3-12
FRIDAY (am) Sunny 91-99 45-55 0% none Var 0-10
(pm) SW-W 0-12
Text Box: Extended Forecast Discussion: Flow over California becomes more zonal on Saturday allowing onshore flow to strengthen and cool off most locations. This will coincide with an upper-level low moving into British Columbia. On Sunday, the low will dive southeastward toward the Northern Rockies which will place the state on the back side of its trough allowing another day of cooling. As the trough moves east on Monday, flat ridging will temporarily develop causing temperatures to momentarily warm a couple of degrees. The warming will procede a trough that is expected to dive southward along the West Coast through Wednesday leading to another significant cool down with temperatures on Wednesday probably running almost 15F below normal. There is a slight chance of showers while the disturbance is nearby but most of the shower activity will be confined to the mountains. Weak ridging should briefly return for the end of the week but models are indicating that another trough should return for the weekend maintaining near to below normal temperatures.
EXTENDED RANGE OUTLOOK                          
    Sat 9/4 Sun 9/5 Mon 9/6 Tue 9/7 Wed 9/8   Trends  Thu 09/9 - Sat 09/11
Weather Sunny Sunny Sunny Sunny P Cloudy   Max Temps: Near to below normal
Max T 89-95 82-89 84-90 76-83 71-78   Min Temps: Near to below normal
Min T 50-70 48-65 43-55 41-54 39-50   Precipitation: Unlikely
Chc of Rain 0% 0% 0% 10% PM 10%   Wx Pattern: Weak ridging develops but another trough should return by the weekend
Amounts none none none Tr - .05 Tr - .10    
Winds SW-W 5-15 SW-W 5-15 SW-W 5-15 SW-W 5-15 SW-W 5-15    
Yesterday across Lake County…          This morning across Lake County…  
Avg Max: 95°F Range: (88 - 100)  Warmest: Guenoc Valley,   Avg Min: 56°F Range: (48 - 72)  Coldest: Red Hills lower  
               
Lake County AMOS Network
Daily Meteorological Summary
Wednesday, September 1, 2010
2-Sep-10
Temperature Avg Avg WIND Precipitation Chill Hours This Morning's
Max time Min time Avg DewPt RH Avg Gust Gust 24hr Season hrs < 45ºF Min Temp
      ºF occur ºF occur ºF ºF % mph mph Dir In. In. ytd 11/1 on °F (7am)
Upper Lake 94.1 1425 46.3 514 69.4 50.9 62 2.0 9.6 SSE 0.00 0.00 0.0 1974 51.4
Scotts Valley 94.6 1707 45.8 611 67.9 55.3 70 0.8 6.6 WNW 0.00 0.00 0.0 50.9
Kelseyville 87.7 1509 47.9 658 78.4 57.6 52 2.7 8.1 NE 0.00 0.00 0.0 52.6
Kelseyville South 97.4 1548 45.5 550 71.2 47.6 51 1.0 7.6 N 0.00 0.00 0.0 1929 50.5
Bell Hill West 94.6 1535 48.2 559 71.8 45.8 46 2.9 10.5 N 0.00 0.00 0.0 2032 53.4
Red Hills 92.6 1713 54.6 254 74.0 46.2 41 1.9 10.5 NE 0.00 0.00 0.0 1782 62.2
Red Hills 2 95.4 1617 53.8 554 74.9 43.9 37 3.0 14.1 E 0.00 0.00 0.0 1832 59.2
Red Hills 3 94.1 1639 63.8 611 78.2 39.4 26 3.9 13.8 ESE 0.00 0.00 0.0 71.8
Red Hills Lower 92.5   42.9                   ---- ---- 48.1
Middletown 96.8 1421 50.5 557 72.9 47.6 50 2.2 11.6 WSW 0.00 0.00 0.0 1810 55.1
Guenoc Valley 100.3 1541 48.9 551 73.7 46.1 46 1.8 12.1 SSW 0.00 ----- 0.0 --- 52.2
Napa Valley Basin not available
Pope Valley 97.4 1644 47.6 533 73.0 46.1 49 1.8 13.5 E 0.00 0.00 ----- --- 51.6
Cow Mountain 84.6 1511 67.8 16 74.8 ----- ----- 5.8 13.9 W ----- ----- ----- --- 70.8
Morgan Valley 88.9 1653 70.3 522 78.9 43.3 24 1.8 27.2 NNW 0.00 0.00 ----- --- 56.0
                                     
. Lake County ETo forecast 7 day outlook Past week ( 8/26 - 9/1 ) summary
  9/2 - 9/8 Daily 7 day period percent
  normal forecast max min total normal normal
  Kelseyville 1.29 1.22 0.25 0.17 1.42 1.37 104%
  Red Hills 2 1.56 1.49 0.30 0.17 1.55 1.66 93%
  Guenoc Valley 1.46 1.38 0.24 0.18 1.46 1.51 97%