BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, NOVEMBER 26, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME LIGHT RAINFALL THIS MORNING WAS ABOUT 0.2 INCH SUMMIT IN THE LOW CLOUDS WITH HEAVY FOG Light rain began in the early hours of this morning and may have been mixed with some sleet (ice pellets) at the start but we cannot confirm it here. The rainfall became intermittent before 7 a.m. and continued throughout the morning. The summit went into the low stratus clouds shortly after 7 a.m. and the low clouds continue this afternoon with heavy fog and visibility near 1/16 mile in the light rain. Total rainfall rainfall had amounted to less than one quarter of an inch by mid-day. Today's observations: 7 A.M. Weather: Partial obscurement, 3/10 with fog, stratus drifting over the summit, light drizzle occurring, light rain ended past hour Temperature: 39F, Dew point: 39F, Wind: SSW at 12 kts Sea-level pressure: 30.15 inches Hg, falling Visibility: 1.5 miles, variable 1.0 to 2.0 miles 6-hour min temp: 36F 6-hour rainfall 0.17 in. 24-hour rainfall 0.17 in. BHO SA 1155 -X E3 OVC 11/2VL-F 211/39/39/2012/015/ F3 VSBY 1V2 STRA DRFTG OVR SMT CDNS OCNLY LWR REUKN/ 8/6// 56013 ASOS 60017 MANUAL 6017/ ASOS 70017 MANUAL 70017 10039 20036 10 A.M. Weather: Obscurement with light rain and heavy fog Temperature: 42F, Dew point: 42F, Wind: S at 11 kts Sea-level pressure: 30.15 inches Hg, falling Visibility: 1/16 mile, light rain and heavy fog BHO SA 1455 W3 X 1/16R-F 209/42/42/1711/015/ RBUKN 8//// 58002 MANUAL 6000/ ASOS 60001 1 P.M. Weather: Obscurement with light rain and heavy fog Temperature: 45F, Dew point: 45F, Wind: S at 06 kts Sea-level pressure: 30.09 inches Hg, falling Visibility: 1/8 mile, variable to 1/16 mile 6-hourly rainfall: 0.04 inch 6-hourly max. temp: 45F BHO SA 1755 W2 X 1/8VR-F 189/45/45/1906/009/ VSBY 1/16V1/8/ 8//// 56020 ASOS 60005 MANUAL 6004/ 10045 20039 WEATHER SUMMARY FOR SUNDAY, NOVEMBER 25 TEMPERATURE (DEGREES F) MAX.....48 NORMAL.....46 MIN.....28 NORMAL.....31 MEAN....38 NORMAL.....39 DEPARTURE FROM 30-YEAR NORMAL...........-1 TOTAL DEPARTURE FOR THE MONTH..........-61 [-2.6 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............27 DEPARTURE....... 0 TOTAL HEATING UNITS FOR THE MONTH...........619 DEPARTURE......+59 TOTAL HEATING UNITS FOR THE SEASON..........965 DEPARTURE.....-186 TOTAL HEATING UNITS LAST SEASON TO DATE.....977 DIFFERENCE.....-12 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............28 S AT 6:09 P.M. AEROVANE.............27 S AT 6:09 P.M. ASOS.................26 S AT 6:10 P.M. DAVIS................31 SSW AT 1:52 P.M. FASTEST MILE FOR YESTERDAY..............19 S AT 8:06 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........18 S AT 8:33 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 SSW AT 3:05 P.M. AVERAGE WIND SPEED AND DIRECTION......13.2 SSW ASOS...............13.3 DAVIS..............14.0 SSW [200 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.17 DEPARTURE....+0.02 ASOS..............0.17 TOTAL PRECIPITATION FOR THE MONTH..........3.20 DEPARTURE....-0.69 ASOS..............3.21 TOTAL PRECIPITATION FOR THE YEAR..........38.74 DEPARTURE....-7.17 ASOS.............38.04 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.8 DEPARTURE.....-1.4 TOTAL SNOWFALL FOR THE SEASON...............0.8 DEPARTURE.....-1.6 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2007...CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW*/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available * entries for daily snowfall beginning 19th 11/1 66/42/54/+7/0/050/08 37 S 11/2 50/37/44/-2/0/446/73 29 NE 11/3 46/40/43/-3/0.95/000/00 51 N Aero 50 MPH NNW 11/4 54/37/46/0/0/503/82 33 W Aero 33 MPH W 11/5 56/40/48/+3/0/483/79 29 SE 11/6 53/37/45/0/0.75/000/00 35 SSE Aero 35 MPH SSE 11/7 50/32/41/-4/0/551/91 30 W 11/8 43/28/36/-8/0/494/82 22 W 11/9 44/32/38/-6/0.09/331/55 21 NNE 11/10 39/28/34/-10/0.05/383/64 32 N 11/11 42/24/33/-10/0/590/99 23 WNW 11/12 42/27/35/-8/0.02/024/04 25 SSE 11/13 55/42/49/+6/0.33/308/52 28 S 11/14 58/41/50/+8/0/507/86 37 S 11/15 64/40/52/+10/0.41/035/06 44 SSE Aero 46 MPH SSE 11/16 44/30/37/-5/0.31/158/27 51 W Aero 54 MPH W 11/17 40/28/34/-7/0/350/60 37 W 11/18 41/29/35/-6/0/495/85 25 ENE 11/19 36/30/33/-8/0.01/0.1/030/05 29 N ** sunshine data corrected 11/20 37/29/33/-7/0.09/0.7/000/00 22 SE 11/21 48/32/40/0/0.01/0/000/00 21 N 11/22 64/40/52/+12/0.01/0/212/37 36 W 11/23 40/23/32/-7/0/.../.. 36 W 11/24 32/16/24/-15/0/0/.../.. 26 WNW 11/25 48/28/38/-1/0/0/0/.../.. 28 S 11/26 morning low temp. 35F; normal low is now 31F morning rainfall thru 7 a.m. is 0.17 inch NEW DAILY RECORDS FOR NOVEMBER 2007: NONE DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 26 HIGH 66 IN 1979 LOW 6 IN 1938 PRECIP 2.22 INCHES IN 1888 SNOWFALL 3.0 INCHES IN 1974 PEAK GUST 78 SSE IN 1964 RECORDS FOR NOVEMBER 27 HIGH 68 IN 1896 LOW 5 IN 1932 PRECIP 1.92 INS IN 1898 SNOWFALL 16.0 INS IN 1898 PEAK GUST 68 NW IN 1997 TODAY'S REPORT PREPARED By: Robert Skilling