BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 1, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED PARTLY CLOUDY AND WARMER THAN AVERAGE TODAY...COOLER AIR IS MOVING IN THIS AFTERNOON BEHIND A WEAK COLD FRONT... OCTOBER 2008 WAS DRIER AND SLIGHTLY COOLER THAN AVERAGE... EASTERN STANDARD TIME RETURNS TONIGHT... After a few freezing mornings the last few days, the low on the summit today was a mild 47. The low of 36 at Norwood Airport made for a moderate low level inversion early this morning. The temperature had climbed into the upper 50s by mid-day, but a shift in the wind direction from W to NE has lowered the temperature by early afternoon. Remember to turn clocks back one hour tonight as we return to standard time for the winter. October 2008 Summary Tmax 59.6 [-0.7] degF Tmin 42.6 [-0.3] degF Tmean 51.1 [-0.5] degF Precipitation: 2.04 [-2.38] inches Snowfall: 0.0 [-0.2] inches HDD: 426 [+4] Avg Wind Speed: 12.2 mph (corrected) Prevailing Direction: WSW Peak Wind Gust: 60 mph, SSE [25th] Sunshine: 61 percent [preliminary] Vapor Pressure: 9.0 mb Today's observations: 8 A.M. EDT Weather: Scattered altocumulus, broken cirrus Temperature: 50F, Dew point: 36F, Wind: WNW at 11 kts Sea-level pressure: 30.16 inches Hg, rising Visibility: 25 miles 6-hourly minimum temperature: 47F BHO SA 1155 180 SCT 250 BKN 25 212/50/36/3011/016/ HAZY/ 8/071 53014 10051 20047 11 A.M. EDT Weather: Thin scattered cirrus, few altocumulus SE-SW, hazy Temperature: 56F, Dew point: 40F, Wind: N at 10 kts Wind: Direction variable NW-NNE Sea-level pressure: 30.20 inches Hg, rising Visibility: 25 miles BHO SA 1455 250 ñSCT 25 226/56/40/3510/020/ FEW AC SE-SW HAZY WND 32V02/ 8/031 51014 2 P.M. EDT Weather: Scattered cumulus, thin overcast cirrus, few lower cumulus, hazy Temperature: 54F, Dew point: 41F, Wind: NE at 8 kts, Wind: Light and variable Sea-level pressure: 30.19 inches Hg, falling Visibility: 30 miles BHO SA 1755 50 SCT 250 ñOVC 30 223/54/41/0508/019/ FEW LWR CU HAZY WND LGT AND VRB/ 8/201 58003 10058 20050 WEATHER SUMMARY FOR FRIDAY, OCTOBER 31 TEMPERATURE (DEGREES F) MAX.....61 NORMAL.....55 MIN.....29 NORMAL.....39 MEAN....45 NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL..............-2 TOTAL DEPARTURE FOR THE MONTH.............-11 [-0.5 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............20 DEPARTURE........+2 TOTAL HEATING UNITS FOR THE MONTH...........426 DEPARTURE........+4 TOTAL HEATING UNITS FOR THE SEASON..........542 DEPARTURE.......-49 TOTAL HEATING UNITS LAST SEASON TO DATE.....346 DIFFERENCE.....+196 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............26 SW AT 11:11 A.M. AEROVANE.............25 SSW AT 8:00 P.M. ASOS.................25 SW AT 8:06 P.M. DAVIS................31 SW AT 7:25 P.M. FASTEST MILE FOR YESTERDAY..............20 SSW AT 8:22 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 SW AT 8:12 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 SSW AT 6:50 P.M. AVERAGE............12.9 WSW ASOS...............12.2 DAVIS..............13.1 SW [229 deg] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.04 DEPARTURE.......-2.38 ASOS..............2.04 TOTAL PRECIPITATION FOR THE YEAR..........44.94 DEPARTURE.......+2.92 ASOS.............47.52 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 10/1 68/58/63/+6/0.49/120/17 38 SW TSTM # 10/2 62/46/54/-2/0.11/455/65 45 W 10/3 62/45/54/-2/T/376/54 44 SSW Aero 43 MPH SSW 10/4 61/40/51/-5/0.00/612/88 32 WSW 10/5 53/45/49/-6/T/000/00 18 WNW 10/6 58/39/49/-6/0.00/303/44 28 WNW 10/7 64/37/51/-4/0.00/687/100 23 WNW 10/8 69/43/56/+2/0.00/581/85 32 S Aero 30 MPH S 10/9 72/55/64/+10/0.02/510/75 33 WSW 10/10 69/53/61/+7/0.00/664/98 29 W 10/11 68/49/59/+6/0.00/668/99 20 NNW 10/12 67/47/57/+4/0.00/625/93 21 W 10/13 62/50/56/+4/0.00/308/46 20 NE 10/14 65/50/58/+6/0.00/514/77 30 SSE 10/15 64/52/58/+6/0.00/618/93 21 ENE 10/16 67/51/59/+8/T/026/04 35 NW 10/17 59/42/51/0/0.00/474/72 26 NW 10/18 51/37/44/-7/0.00/440/67 25 N 10/19 46/36/41/-10/0.00/176/27 36 NNE Aero 36 MPH NNE 10/20 54/34/44/-6/0.00/631/97 25 N 10/21 59/43/51/+1/0.01/129/20 20 W 10/22 44/38/41/-9/0.10/000/00 32 NNW 10/23 45/31/38/-11/0.00/520/81 23 N 10/24 62/34/48/-1/0.00/589/92 22 WSW 10/25 66/44/55/+6/0.28/038/06 60 SSE Aero 61 MPH SSE TSTM 10/26 64/48/56/+8/0.60/418/66 55 SSE Aero 60 MPH SSE 10/27 66/47/57/+9/0.00/631/100 21 NNE 10/28 51/36/44/-4/0.43/063/10 42 SSE 10/29 44/32/38/-9/0.00/157/25 43 SW 10/30 45/29/37/-10/0.00/611/98 30 W Aero 28 MPH WNW 10/31 61/29/45/-2/0.00/621/100 26 SW 11/1 morning low temp. 47F; normal low temp. 39F # Thunderstorm gust NEW DAILY RECORDS FOR OCTOBER None... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 1 HIGH 75 IN 2003 LOW 22 IN 1913,1923 PRECIP 2.93 INCHES IN 1985 SNOWFALL TRACE IN 1906,1951 PEAK GUST 78 ESE IN 1997 RECORDS FOR NOVEMBER 2 HIGH 81 IN 1950 LOW 22 IN 1965 PRECIP 1.67 INCHES IN 1970 SNOWFALL 0.2 IN 1906,1951 PEAK GUST 63 WSW IN 1973 TODAY'S REPORT PREPARED By: Mike Iacono