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 July 29, 2010 issued 7:30am     by Forecaster Chris Link
Text Box: HIGHLIGHTS: Temperatures will gradually warm over the next couple of days but remain slightly below normal. Some cooling is possible by early next week with only minor fluctuations in temperatures for much of the next seven days.
Text Box: Short Term Weather Discussion: The marine layer remains intact this morning, despite shrinking over 1000ft overnight as ridging aloft starts to nose its way into the Golden State from the Desert SW. Meanwhile, a weak upper-level low is parked off the coast of California and Oregon maintaining a weak trough along much of the West Coast. Over the next 24-36hrs, ridging aloft will gradually warm temperatures a few degrees with the warmest locations the farthest inland where cooler marine air can not reach. A very strong inversion developed overnight with the coldest temperatures in the county reaching the upper 30's while some of the surrounding hills remained in the 60's. Temperatures should warm quickly with high temperatures today generally ranging from the upper 80's to the middle 90's in Lake County. After another unseasonably cool night, temperatures tomorrow will be similar to if not a degree or so warmer than today as ridging aloft allows the atmosphere to continue warming.
SHORT TERM FORECAST SPECIFICS
Weather Max/Min Dew Pts POPs Amounts Winds
TODAY Sunny 86-93 45-55 0% none Var-NW 5-15
TONIGHT (vals) Clear 42-52 40-50 0% none Var 0-5
(hills) 55-63
FRIDAY Sunny 88-94 45-55 0% none W-Var 5-15
Text Box: Extended Forecast Discussion: During the day on Saturday, the upper-level low off the coast of California and Oregon will slowly drift inland deepening the marine layer. This will result in cooler temperatures for most coastal areas and those areas with a marine influence while inland areas see little change. Another wave of upper-level energy will dive south out of British Columbia by Sunday maintaining the trough along the West Coast with this system sliding inland on Monday possibly helping to cool inland areas a degree or two. While a long wave trough will remain entrenched over the West Coast, a building ridge over the Central U.S. may lead to slight warming for the middle of the week but models maintain some semblance of a trough through the end of next week preventing hot temperatures.
EXTENDED RANGE OUTLOOK                          
    Sat 7/31 Sun 8/1 Mon 8/2 Tue 8/3 Wed 8/4   Trends  Thu 08/5 - Sat 08/7
Weather Sunny Sunny Sunny Sunny Sunny   Max Temps: Near normal
Max T 88-94 85-93 84-93 85-93 96-94   Min Temps: Near normal
Min T 45-60 44-60 45-60 48-62 48-62   Precipitation: None
POP 0% 0% 0% 0% 0%   Wx Pattern: A trough remains entrenched along the West Coast preventing hot temperatures
Amounts none none none none none    
Winds W-Var 5-15 W-Var 5-15 W-Var 3-12 W-Var 5-15 W-Var 5-15    
Yesterday across Lake County…          This morning across Lake County…  
Avg Max: 87°F Range: (85 - 89)  Warmest: Guenoc Valley,   Avg Min: 47°F Range: (38 - 51)  Coldest: Red Hills lower    
               
Lake County AMOS Network
Daily Meteorological Summary
Wednesday, July 28, 2010
29-Jul-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 88.1 1424 50.6 409 69.1 52.0 64 2.3 10.6 SSE 0.00 0.00 0.0 1974 47.2
Scotts Valley 85.6 1546 49.2 541 66.6 52.8 67 1.2 8.3 SW 0.00 0.00 0.0 45.0
Kelseyville 86.2 1348 50.0 443 67.2 47.6 55 3.3 14.7 WSW 0.00 0.00 0.0 47.5
Kelseyville South 86.4 1216 45.9 339 67.4 45.1 51 2.4 16.0 E 0.00 0.00 0.0 1929 42.9
Bell Hill West 85.0 1153 47.3 524 67.4 43.9 49 4.3 16.5 NNE 0.00 0.00 0.0 2032 46.8
Red Hills 87.3 1442 54.6 504 68.6 45.1 49 1.9 10.1 E  0.00 0.00 0.0 1782 51.1
Red Hills 2 87.8 1409 48.4 444 68.7 43.1 45 4.0 10.6 WNW 0.00 0.00 0.0 1832 48.3
Red Hills 3 87.3 1442 49.9 504 68.6 45.1 49 1.9 10.1 E  0.00 0.00 0.0 51.1
Red Hills Lower 85.9   40.5                   ---- ---- 37.8
Middletown 85.5 1252 43.2 514 64.0 44.0 53 2.1 10.2 WSW 0.00 0.00 2.1 1810 43.6
Guenoc Valley 88.7 1407 42.1 510 65.8 40.1 47 2.2 13.0 SSW 0.00 ----- 2.6 --- 42.0
Napa Valley Basin 88.7 1707 41.8 618 65.6 ----- ----- 2.4 18.9 SSE 0.00 0.00 ----- --- 44.6
Pope Valley 85.1 1547 42.6 503 66.0 47.3 56 2.6 12.0 SW 0.00 0.00 ----- --- 43.5
Cow Mountain 76.4 1214 59.3 532 65.9 ----- ----- 7.1 16.1 W ----- ----- ----- --- 63.6
Morgan Valley 79.4 1335 56.9 454 69.4 30.9 35 2.2 18.2 SSW 0.00 0.00 ----- --- 45.9
                                     
. Lake County ETo forecast 7 day outlook Past week ( 7/22 - 7/28 ) summary
  7/29 - 8/4 Daily 7 day period percent
  normal forecast max min total normal normal
  Kelseyville 1.57 1.57 0.27 0.25 1.84 1.67 110%
  Red Hills 2 1.77 1.77 0.29 0.26 1.96 1.89 104%
  Guenoc Valley 1.75 1.75 0.27 0.23 1.75 1.84 95%