2007-04-04: YMW upper air data from FSL's server at NOAA in Boulder, CO. Forecast max temp from AVN MOS for Whitefield NH from nws.noaa.gov. === Interpolations from YMW data - temps:deg. F, altitudes:feet MSL === MSL *TI* Wdir@kts trig VirT 1.6 degrees/division ("`": Dry Adiabatic) ----- ---- -------- ---- . ---- ----------------------------------------- 15000 28.4 88 | 9.6 ` : 14500 27.9 87 | 11.4 ` : 14000 27.4 185 20 86 | 13.1 ` : 13500 26.9 85 | 14.9 ` : 13000 26.4 175 16 84 | 16.7 ` : 12500 25.9 84 | 18.5 ` : 12000 25.4 175 12 83 | 20.3 ` : 11500 24.9 82 | 22.0 ` : 11000 24.4 81 | 23.8 ` : 10500 23.9 80 | 25.6 ` : 10000 23.4 79 | 27.4 ` : 9500 22.9 78 | 29.1 ` : 9000 22.4 165 18 77 | 30.9 ` : 8500 21.7 76 | 32.3 ` : 8000 21.0 165 18 75 | 33.6 ` : 7500 20.1 73 | 34.8 ` : 7000 19.0 185 30 71 | 35.4 ` : 6500 17.8 69 | 35.9 ` : 6000 16.6 175 33 67 | 36.5 ` : 5500 14.0 62 | 34.4 ` : 5000 13.3 165 35 61 | 35.8 ` : 4500 12.6 60 | 37.2 ` : 4000 9.5 150 38 54 | 34.4 ` : 3500 7.9 51 | 34.2 ` : 3000 6.7 135 35 49 | 34.6 ` : 2500 4.4 45 | 33.3 ` : 2000 3.2 115 24 43 | 33.7 ` : 1500 2.7 42 | 35.6 ` : 1000 2.3 110 16 41 | 37.4 ` : 500 1.8 40 | 39.3 (CB: 500) ` : Forecast high temp 37. === NWS Regional Summary - 340 AM EDT WED APR 4 2007 === Perhaps old man winter failed to consult his calender, as a late season storm bears down on the region. A winter storm warning is in effect for most of Maine and New Hampshire, with around a foot of snow expected in the mountains. Although snowfall totals should taper down south and towards the coast, even far southern locations in New Hampshire should see several inches of wet snow with this system. At 300 am low pressure Sat over the Great Lakes, with high pressure slowly retreating into the north Atlantic. A boundary extended eastward from the low, causing some light snow across much of New Hampshire. Temperatures were in the lower 30s across most of Maine and New Hampshire. The main area of low pressure will slowly move north of the Great Lakes, meanwhile a secondary area of low pressure will develop along the mid Atlantic coast, eventually tracking through the Gulf of Maine. This is significant because this secondary low will keep just enough cold air in place to cause most of the precipitation to fall as snow. Expect periods of snow across New Hampshire for much of the day, becoming steadier and spreading into Maine as the day goes on. Snow may struggle to accumulate in spots during the day, as the daytime warming helps melt the snow, however snow should start to accumulate in all locations by dusk. Also, higher elevations will be slightly cooler, allowing snow to accumulate during the day today, leading to higher snowfall totals across the mountains, and ridge tops. Temperatures today will top off in the mid to upper 30s. Snow will fall overnight, gradually tapering to snow showers Thursday morning. The low will be very slow to exit the region, circling back across northern Maine Thursday evening, then backing into Quebec Friday. This will cause snow showers to linger in the mountains through Friday, although additional accumulation should be minimal. Temperatures will continue to be on the cool side, with daytime highs struggling to get out of the 30s. Looking ahead to this weekend, a cool moist flow will continue. Low pressure will remain anchored near the region, with more clouds than sun expected, and daytime highs generally in the lower 30s in the mountains, and around 40 in southern locations. === The weather observed at WHITEFIELD, NH at 08:52 AM EST was: === The skies were cloudy. The prevailing visibility was 10 miles. Temperature: 34F ( 1C) Dewpoint: 25F ( -4C) Relative Humidity: 69% There was no wind. Pressure: 1015.8 millibars. Altimeter:29.96 inches of mercury. === The weather observed at MOUNT WASHINGTON, NH at 08:56 AM EST was: === The weather reported was moderate snow and fog. The skies were unobserved. The prevailing visibility was .06 miles. Temperature: 25F ( -4C) Dewpoint: 25F ( -4C) Relative Humidity: 100% Winds from the S (180 degs) at 26 mph. === MPV Terminal Aerodrome Forecast not available. ===