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 
        Monday February 8, 2010 issued 7:30am     by Forecaster Tom Cushman
Text Box: HIGHLIGHTS: Partly cloudy today after areas of valley fog break up. Mostly cloudy with showers developing overnight. Showers continuing Tuesday before decreasing, finally ending late in the day. More rain late Thu into Friday.
Text Box: Short Term Weather Discussion: Weak ridging remains in place across California while a compact disturbance, positioned over the eastern Gulf of Alaska, is separating itself from the main hemispheric flow. All indications are that this cutoff low will rotate toward and eventually across California over the next 24-36 hours. Thus expect increasing mid, high cloudiness across the North State today (not visible for some Lake County valley locations until fog, low clouds break up later this morning) which will culminate in scattered showers (& perhaps some isolated thundershowers) migrating across Northern California late tonight into Tuesday. Coverage of this precipitation (expect to primarily occur between midnight tonight and noon tomorrow) is apt to be spotty with many Lake County valley locations getting little more than trace amounts while a few favored locations could see as much as 1/10 inch.
SHORT TERM FORECAST SPECIFICS
Weather Max/Min Dew Pts POP Amounts Winds
TODAY (am) areas of fog 55-60 32-37 0% none Var 0-10
(pm) Partly Cloudy 35-40
TONIGHT (eve) Mostly Cloudy 37-42 37-42 40% Tr -.10 S-SW 5-10
(late) Showers 80%
TUESDAY (am) Showers 45-55 40-45 80% Tr -.10 SW-W 5-15
(pm) Mostly Cloudy 40% W-NW 5-15
Text Box: Extended Forecast Discussion: Dry conditions are apt to return Wednesday into Thursday prior to the arrival the next Pacific weather system. Present indications are that this disturbance will pass through diverging flow during its approach of the West Coast, causing this weather system to weaken significantly by the time it advances inland across the North State. Thus expect only light amounts of precipitation across Lake County during its passage Thursday night into Friday. High pressure is expected to quickly rebuild across California in this disturbance's wake, leaving Lake County dry, seasonably mild next weekend with plenty of frost potential . Further down the road, another rapidly weakening disturbance is expected to bring the next chance of rain to Lake County early next week although dry conditions should return in its wake as the storm track remains aimed north of California.
EXTENDED RANGE OUTLOOK                          
    Wed 2/10 Thu 2/11 Fri 2/12 Sat 2/13 Sun 2/14   Trends  Mon 02/15 - Wed 02/17
Weather Partly Cldy Cloudy Occ'l Rain Sunny M Sunny   Max Temps: Near to above normal
Max T 50-60 52-57 47-52 55-60 55-65   Min Temps: Below to near normal
Min T 25-35 30-40 40-45 28-36 28-42   Precipitation: Below normal
POP 0% 40% late 60% am 0% 0%   Wx Pattern: Westerlies take left turn approaching West Coast, keeping CA relatively dry
Amounts none Tr -.10 Tr - .25 none none    
Winds NW-N 5-15 S-SW 5-15 SW-W 5-15 N-NE 5-10 S-Var 0-10    
Yesterday across Lake County…          This morning across Lake County…  
Avg Max: 56°F Range: (53 - 61)  Warmest: Guenoc Valley,   Avg Min: 33°F Range: (29 - 38)  Coldest: Scotts Valley    
               
Lake County AMOS Network
Daily Meteorological Summary
Sunday, February 7, 2010
8-Feb-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 56.0 1527 33.3 737 44.0 41.6 92 3.1 11.6 NNW 0.00 22.33 12.7 1393 33.7
Scotts Valley 57.7 1419 29.0 703 41.3 37.4 87 1.4 12.6 W 0.00 23.75 14.8 1457 28.8
Kelseyville 57.4 1414 32.7 739 44.0 37.7 80 2.5 12.7 WNW 0.00 18.07 14.6 1372 31.9
Kelseyville South 55.7 1416 32.9 721 43.6 38.3 83 1.6 12.3 WSW 0.05 14.77 14.5 1345 32.1
Bell Hill West not available                         n/a
Red Hills 53.0 1443 54.6 719 44.1 38.0 80 5.8 13.2 WSW 0.00 26.73 16.2 1225 33.1
Red Hills 2 53.6 1452 36.6 732 43.2 36.8 79 7.4 13.2 WNW 0.00 16.34 16.9 1247 38.2
Red Hills 3 not available n/a
Red Hills Lower 55.2   35.7                   ---- ---- 36.7
Middletown 58.1 1452 32.3 715 43.1 1.9 11.2 SW 0.00 36.93 15.0 1254 30.1
Guenoc Valley 60.8 1452 33.1 658 45.1 ----- 82 1.9 10.1 SSW 0.00 ----- 14.6 --- 31.5
Napa Valley Basin 61.7 1359 34.8 733 47.5 ----- ----- 0.9 10.5 WNW 0.00 20.45 13.1 1185 30.0
Pope Valley 61.7 1515 36.2 2343 46.2 42.2 88 0.9 10.1 WSW 0.00 17.78 14.4 1210 34.2
Cow Mountain 42.7 2348 32.9 732 36.7 ----- ----- 9.2 18.8 WNW ----- ----- ----- --- 36.1
Morgan Valley 51.5 1458 36.3 638 43.3 36.1 81 3.6 18.6 NW 0.00 25.92 ----- --- 36.7