BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 16, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME EARLY CLOUDS DEPART BY MID-DAY AS DAY TURNS SUNNY AND WARMER... A small disturbance moved through overnight and brought a few showers far to the southwest, though no precipitation was recorded at the Observatory. The overnight temperature remained a very mild 40F, though lower elevations dropped to near freezing this morning. The low temperature at Norwood Airport today was 31F. Once again the temperature has warmed up nicely this afternoon, just reaching the high on Friday of 59F as of 2 PM. The air remains very dry with a dew point of 20F and a relative humidity of 23% being measured on the summit at 1 PM today. Today's Observations: 7 A.M. Weather: Broken altocumulus, overcast altocumulus, high cirrus clouds visible, breaks in overcast south, hazy Temperature: 43F; Dew Point: 25F; Wind: WNW at 10 kts. Sea-level pressure: 30.27 ins. Hg, rising then rising more slowly Visibility: 30 miles, hazy 6-hr min temp: 40F BHO SA 1155 E90 BKN 130 OVC 30 249/43/25/2910/027/ HIR CLDS VSBL BINOVC DSNT S HAZY/ 8/071 51011 10043 20040 10 A.M. Weather: Scattered stratocumulus, broken altocumulus, thin smoke layer along horizon N-ENE, hazy Temperature: 48F; Dew Point: 22F; Wind: WNW at 11 kts. Sea-level pressure: 30.31 ins. Hg, rising then rising more slowly Visibility: 50 miles, hazy, smoke layer along/above horizon N-ENE, visibility NNE-S 35 miles, NW 70 miles BHO SA 1455 60 SCT E85 BKN 50 263/48/22/2911/031/ THN K LYR ALG HRZN N-ENE VSBY NNE-S 35 NW 70 HAZY/ 8/070 51014 1 P.M. Weather: Clear, few stratocumulus distant E-SSW, few altocumulus distant NE-SE, light haze Temperature: 57F; Dew Point: 20F; Wind: WSW at 5 kts, Wind: Light and variable Sea-level pressure: 30.28 ins. Hg, falling then falling more rapidly Visibility: 60 miles, light haze 6-hr max temp: 57F BHO SA 1755 CLR 60 255/57/20/2505/028/ FEW SC DSNT E-SSW FEW AC DSNT NE-SE LGT HZ VSBY NE-SE 40 WND LGT AND VRB/ 8/570 58008 10057 20043 WEATHER SUMMARY FOR FRIDAY, NOVEMBER 15, 2013 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....50 MIN.....38 NORMAL.....34 MEAN....49 NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL......................+7 TOTAL DEPARTURE FOR THE MONTH.....................-10 [-0.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............16 DEPARTURE.........-7 TOTAL HEATING UNITS FOR THE MONTH.............322 DEPARTURE........+10 * TOTAL HEATING UNITS FOR THE SEASON............799 DEPARTURE........-76 * TOTAL HEATING UNITS LAST SEASON TO DATE.......739 DIFFERENCE.......+60 * Monthly and seasonal HDD and departure values corrected from previous reports. PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................24 S AT 14:58 P.M. AERO.......................25 S AT 15:02 P.M. ASOS.......................26 S AT 15:07 P.M. DAVIS......................25 SSW AT 14:50 P.M. RMY 26 FASTEST MILE FOR YESTERDAY....................21 S AT 14:58 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................21 SSW AT 15:08 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................20 SSW AT 14:13 P.M. AVERAGE WIND SPEED AND DIRECTION............13.6 SSW ASOS.....................13.7 DAVIS....................12.6 SW [218 degrees] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE............-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.66 DEPARTURE............-1.70 ASOS..............0.64 TOTAL PRECIPITATION FOR THE YEAR..........43.67 DEPARTURE............-2.46 * ASOS..............N/A** **ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals * Annual precipitation corrected from previous reports. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.......0.0 DEPARTURE.............-0.1 TOTAL SNOWFALL FOR THE MONTH.............0.2 DEPARTURE.............-0.4 TOTAL SNOWFALL FOR THE SEASON............0.2 DEPARTURE.............-0.7 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 11/1 68/56/62/+16/0.10/0.0/012/02 60 SSW AERO N/A N/A RMY 66 11/2 65/49/57/+11/0.00/0.0/296/48 22 WSW AERO N/A N/A RMY 23 11/3 49/30/40/-6/0.06/T/135/22 23 N AERO N/A N/A RMY N/A 11/4 42/27/35/-10/0.00/0.0/588/96 24 NNE AERO N/A N/A RMY 25 11/5 50/29/40/-5/0.00/0.0/487/80 16 SSW AERO N/A N/A RMY 17 11/6 59/40/50/+5/0.00/0.0/419/69 30 SSW AERO 31 MPH SSW RMY 33 11/7 65/37/51/+6/0.31/0.0/079/13 33 SW AERO 37 MPH SW RMY 37 11/8 48/31/40/-4/T/T/0.0/421/70 37 WNW AERO 37 MPH WNW RMY 39 11/9 44/29/37/-7/0.00/0.0/366/61 25 WNW AERO 25 MPH WNW RMY 29 11/10 52/40/46/+2/0.08/0.0/108/18 31 WNW AERO 33 MPH WNW RMY N/A 11/11 51/36/44/+1/0.00/0.0/.../.. 36 WNW AERO 37 MPH WNW RMY 37 11/12 48/24/36/-7/0.11/0.2/000/00 42 SW AERO 43 MPH SW RMY 43 11/13 35/21/28/-15/0.00/0.0/.../.. 29 NW AERO 30 MPH NW RMY 30 11/14 49/26/38/-4/0.00/0.0/.../.. 25 SW AERO 25 MPH SW RMY 28 11/15 59/38/49/+7/0.00/0.0/.../.. 24 S AERO 25 MPH S RMY 26 11/16 morning low temp: 40F; the normal low is now 34F DAILY RECORDS FOR NOVEMBER 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 16 HIGH 73F IN 1927 LOW 8F IN 1933 PRECIP 2.25 INCHES IN 1981 SNOWFALL 2.0 IN 1913 PEAK GUST 78 S IN 1989 RECORDS FOR NOVEMBER 17 HIGH 74F IN 1928 LOW 10F IN 1924 PRECIP 1.92 INCHES IN 1920 SNOWFALL 1.0 INS IN 1980 PEAK GUST 61 SSE IN 2006 TODAY'S REPORT PREPARED BY: Mike Iacono