BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 14, 2009 ALL DATA IN EASTERN STANDARD TIME PERIODS OF HEAVY RAINFALL SINCE EARLY TODAY... STORM TOTAL IS APPROACHING TWO INCHES... Rainfall that began between 4 and 5 AM this morning became moderate and occasionally heavy at mid-morning. The total through 7 AM was 0.31 inch, with another 1.48 inches falling in the six hours ending at 1 PM. This brings the storm total up to 1.79 inches, which is approaching the record rainfall for this date of 1.87 inches set in 1972. Winds that gusted earlier to a peak of 39 mph NE at 7:15 AM, have decreased since 11 AM. Today's observations: 7 A.M. Weather: Sky obscured in moderate rain and fog Temperature: 50F, Dew point: 50F, Wind: NE at 18G28 kts, Wind: Peak gust past hour 33 kts NE at 6:42 A.M. Sea-level pressure: 30.09 inches Hg, rising Visibility: 1/2 miles, variable 1/4-3/4 mile 6-hour minimum temp: 49F 24-hour precipitation: 0.31 inch BHO SA 1155 W3 X 1/2VRF 188/50/50/0418G28/009/ VSBY 1/4V3/4 PK WND 0433/42/ 8//// 51003 6031/ 70031 10050 20049 10 A.M. Weather: Sky obscured in light rain and fog, stratus drifting over the summit Temperature: 51F, Dew point: 51F, Wind: NE at 18G25 kts, Wind: Direction variable from N to ENE Sea-level pressure: 30.06 inches Hg, falling Visibility: 1/4 mile, dense fog 3-hourly precipitation: 0.90 inch BHO SA 1455 W2 X 1/4R-F 181/51/51/0418G25/006/ STRA DRFTG OVR SMT WND 01V07/ 8//// 58007 6090/ 1 P.M. Weather: Sky obscured in light rain, light drizzle and fog Temperature: 53F, Dew point: 53F, Wind: NE at 13 kts, Sea-level pressure: 29.99 inches Hg, falling Visibility: 1/8 mile, dense fog 6-hourly max. temp: 53F 6-hourly precipitation: 1.48 inches BHO SA 1755 W2 X 1/8R-L-F 157/53/53/0513/999/ L-BUKN/ 8//// 56024 6148/ 10053 20050 WEATHER SUMMARY FOR FRIDAY, NOVEMBER 13 TEMPERATURE (DEGREES F) MAX.....49 NORMAL.....50 MIN.....44 NORMAL.....35 MEAN....47 NORMAL.....43 DEPARTURE FROM 30-YEAR AVERAGE............+4 TOTAL DEPARTURE FOR THE MONTH............+32 [+2.3 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............18 DEPARTURE........-4 TOTAL HEATING UNITS FOR THE MONTH...........232 DEPARTURE.......-33 TOTAL HEATING UNITS FOR THE SEASON..........853 DEPARTURE........-3 TOTAL HEATING UNITS LAST SEASON TO DATE.....766 DIFFERENCE......+87 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............39 NNE AT 9:33 A.M. AEROVANE..............37 NNE AT 1:53 P.M. ASOS..................38 NE AT 9:34 A.M. DAVIS.................36 NNE AT 4:08 P.M. FASTEST MILE FOR YESTERDAY...............25 NE AT 9:56 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............25 NE AT 11:36 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 NNE AT 11:36 A.M. AVERAGE WIND SPEED AND DIRECTION.......19.4 NE ASOS................18.6 DAVIS...............18.4 NE [035 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.31 DEPARTURE....-0.15 ASOS..............0.31 TOTAL PRECIPITATION FOR MONTH ............0.37 DEPARTURE....-1.63 ASOS..............0.35 TOTAL PRECIPITATION FOR THE YEAR..........45.48 DEPARTURE....+1.46 ASOS.............46.66 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.....-1.0 TOTAL SNOWFALL FOR THE SEASON...............3.0 DEPARTURE.....+1.8 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 11/1 58/44/51/+4/0.05/167/27 22 WNW 11/2 49/42/46/0/T/099/16 29 NE 11/3 57/36/47/+1/0/474/77 32 W AERO 32 MPH W 11/4 49/34/42/-4/0/514/84 24 W 11/5 46/36/41/-4/0.01/006/01 21 N 11/6 47/31/39/-6/0/419/69 38 WNW AERO 38 MPH WNW 11/7 49/29/39/-6/0/575/95 33 S 11/8 66/42/54/+10/0/549/91 31 SSW 11/9 68/49/59/+15/0/486/81 35 S AERO 35 MPH S 11/10 62/50/56/+12/0/000/00 23 SW 11/11 50/43/47/+4/0/113/19 31 NNE 11/12 49/41/45/+2/0/.../.. 34 NE AERO 31 MPH NNE 11/13 49/44/47/+4/0/0/0 39 NNE AERO 37 MPH NNE 11/14 morning low temp: 49F; the normal low is now 35F NEW DAILY RECORD FOR NOVEMBER 2009 None DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 14 HIGH 70 IN 1993 LOW 11 IN 1905 PRECIP 1.87 IN 1972 SNOWFALL 3.5 IN 1997 PEAK GUST 63 W IN 2003 RECORDS FOR NOVEMBER 15 HIGH 74 IN 1993 LOW 15 IN 1933 PRECIP 1.66 INCHES IN 1981 SNOWFALL 4.0 IN 1967 PEAK GUST 65 SSE IN 2008 TODAY'S REPORT PREPARED BY: Mike Iacono