BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 9, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME DRY AND COOL WEATHER TODAY WITH INCREASING CLOUDS Today is shaping up to be a below average day for temperatures, with a chilly morning low temperature of 29F and an afternoon high so far of 44F. The air has been very dry today, with a dew point falling to near 20F this afternoon. The day began mostly clear, but high clouds quickly invaded the sky during the mid-morning hours, which has helped keep the temperature down. The wind has been less blustery today than yesterday, when it gusted up to 37mph. Today's peak gust so far is only 25mph. Visibility has become very good this afternoon, up to 85 miles, which is near our maximum value. Despite a beneficial rainfall of 0.31 inches on Thursday, we remain locked in a dry pattern with little precipitation expected this coming week. A yearly precipitation surplus that topped 5.50 inches in early September is now a deficit of around 1.50 inches, and this deficit will likely continue to grow during the mostly dry conditions expected for the next several days. A trace of precipitation was recorded yesterday, which included a light rain shower as well as some snow pellets. Today's Observations: 7 A.M. Weather: Clear, stratocumulus distant NW-N and distant offshore NE-SE, cirrus distant S-W Temperature: 30F; Dew Point: 23F; Wind: W at 16 kts Sea-level pressure: 30.20 ins. Hg, rising Visibility: 70 miles, light distant haze 6-hr min temp: 31F 24-hr precip: Trace BHO SA 1155 CLR 70 226/30/23/2816/020/ SC DSNT NW-N AND DSNT OFFSHR NE-SE CI DSNT S-W LGT DSNT HZ/ 8/501 52015 7000/ 10031 20029 10 A.M. Weather: Scattered cirrus, broken cirrus, few stratocumulus distant offshore NE-ESE, dense cirrus distant SW-WNW, cirrocumulus mostly overhead and S-SW Temperature: 40F; Dew Point: 21F; Wind: WNW at 15G21 kts, Wind: Direction variable W-NNW Sea-level pressure: 30.19 ins. Hg, rising then falling Visibility: 75 miles, light distant haze BHO SA 1455 220 SCT E250 BKN 75 222/40/21/2915G21/019/ FEW SC DSNT OFFSHR NE-ESE DNS CI DSNT SW-WNW CC MSTLY OVHD AND S-SW LGT DSNT HZ WND 26V33/ 8/509 58004 1 P.M. Weather: Scattered altocumulus, broken altostratus, broken cirrus, few cumulus distant S, few stratocumulus distant offshore NE-E and distant SW-WNW, sun dimly visible Temperature: 42F; Dew Point: 20 F; Wind: WNW at 15G22 kts, Wind: Direction variable WSW-NW Sea-level pressure: 30.14 ins. Hg, falling then falling more rapidly Visibility: 85 miles 6-hr max temp: 44F BHO SA 1755 85 SCT E140 BKN 220 BKN 85 205/42/20/2915G22/014/ FEW CU DSNT S FEW SC DSNT OFFSHR NE-E AND DSNT SW-WNW SUN DMLY VSBL WND 25V32/ 8/571 58017 10044 20030 WEATHER SUMMARY FOR FRIDAY, NOVEMBER 8, 2013 TEMPERATURE (DEGREES F) MAX.....48 NORMAL.....53 MIN.....31 NORMAL.....36 MEAN....40 NORMAL.....44 DEPARTURE FROM 30-YEAR NORMAL......................-4 TOTAL DEPARTURE FOR THE MONTH.....................+13 [+1.4 DEGREE/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............25 DEPARTURE.........+4 TOTAL HEATING UNITS FOR THE MONTH.............150 DEPARTURE.........-8 TOTAL HEATING UNITS FOR THE SEASON............627 DEPARTURE........-94 TOTAL HEATING UNITS LAST SEASON TO DATE.......606 DIFFERENCE.......+21 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................37 WNW AT 6:16 P.M. AERO.......................37 WNW AT 6:16 P.M. * ASOS.......................40 W AT 6:17 P.M. DAVIS......................35 WNW AT 3:52 P.M. RMY 39 FASTEST MILE FOR YESTERDAY....................27 W AT 3:55 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE.................29 W AT 3:50 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................25 W AT 3:50 P.M. AVERAGE WIND SPEED AND DIRECTION............14.4 W ASOS.....................13.9 DAVIS....................12.4 WNW [285 degrees] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace DEPARTURE.............-0.15 ASOS..............0.30 TOTAL PRECIPITATION FOR THE MONTH..........0.47 DEPARTURE.............-0.77 ASOS..............0.46 TOTAL PRECIPITATION FOR THE YEAR..........43.48 DEPARTURE.............-1.53 ASOS..............N/A** **ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.......Trace DEPARTURE.............-0.1 TOTAL SNOWFALL FOR THE MONTH.............Trace DEPARTURE.............-0.3 TOTAL SNOWFALL FOR THE SEASON............Trace DEPARTURE.............-0.6 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/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/+16/0.10/012/02 60 SSW AERO N/A N/A RMY 66 11/2 65/49/57/+11/0.00/296/48 22 WSW AERO N/A N/A RMY 23 11/3 49/30/40/-6/0.06/135/22 23 N AERO N/A N/A RMY N/A 11/4 42/27/35/-10/0.00/588/96 24 NNE AERO N/A N/A RMY 25 11/5 50/29/40/-5/0.00/487/80 16 SSW AERO N/A N/A RMY 17 11/6 59/40/50/+5/0.00/419/69 30 SSW AERO 31 MPH SSW RMY 33 11/7 65/37/51/+6/0.31/079/13 33 SW AERO 37 MPH SW RMY 37 11/8 48/31/40/-4/T/.../.. 37 WNW AERO 37 MPH WNW RMY 39 11/9 morning low temp: 29F; the normal low is now 35F 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 9 HIGH 72 IN 1975 LOW 17 IN 1971 PRECIP 1.37 INCHES IN 1969 SNOWFALL 0.2 IN 1921,1923 PEAK GUST 73e S IN 1943 RECORDS FOR NOVEMBER 10 HIGH 75 IN 1931 LOW 20 IN 2004 PRECIP 2.11 INCHES IN 1888 SNOWFALL 2.2 IN 1987 PEAK GUST 83e S IN 1942 TODAY'S REPORT PREPARED BY: Jonathan O'Brien