BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, FEBRUARY 12, 2016 ALL TIMES ARE IN EASTERN STANDARD TIME SNOW SHOWERS COME TO AN END YESTERDAY AFTERNOON, ARCTIC AIR VISITS THE SUMMIT OF GREAT BLUE HILL, OVERNIGHT LOW OF 2F Snow showers stopped and started continuously yesterday morning, accounting to just a trace of accumulation. Temperatures crested at 25F during mid morning, and dropped quickly during the overnight hours. By 6:00 AM EST this morning temperatures had bottomed out at 2F, which is the coldest temperature so far this winter season. By this morning's 7:00 AM EST observation, temperatures had warmed slightly to 4F, with a west wind 12 knots, creating a wind chill of -12F. By the 1:00 PM EST observation a thin layer of cirrus had overtaken most of the sky with a few stratocumulus distant offshore. Visibility had decreased slight from 80 miles this morning to 75 miles. Temperatures had risen from the single digits this morning to a maximum reading so far of 22F. Today's Observations: 7 A.M. Weather: Clear, few stratocumulus distant offshore NNE-SSW Temperature: 4F; Dew Point: -9F; Wind: W at 12 kts, Wind Chill: -12F Sea-level pressure: 30.19 ins. Hg, rising, then more quickly Visibility: 80 miles 6-hr Max temp: 6F 6-hr Min temp: 2F 24-hr precip: Trace 24-hr snowfall: Trace Snow depth: 8 ins. BHO SA 1155 CLR 80 222/4/-9/2612/019/ FEW SC DSNT OFFSHR NNE-SSW WIND CHILL -12F NEW SNW PST 24 HRS TRACE/ 8/500 4/008 53016 10006 20002 10 A.M. Weather: Scattered cirrus, few stratocumulus distant offshore NE-S Temperature: 13F; Dew Point: -4F; Wind: estimated W at 7 kts Wind Direction: Variable Sea-level pressure: 30.19 ins. Hg, rising, then falling, but higher still Visibility: 75 miles BHO SA 1455 250 SCT 75 223/13/-4/E2807/019/ FEW SC DSNT OFFSHR NE-S WND 19V01/ 8/501 50001 1 P.M. Weather: Thin broken cirrostratus, few stratocumulus distant offshore ENE-ESE and SSE-SW Temperature: 21F; Dew Point: 4F; Wind: SW at 8 kts, Sea-level pressure: 30.12 ins. Hg, falling, then more slowly Visibility: 75 miles 6-hr Max temp: 22F 6-hr Min temp: 4F BHO SA 1755 E200 BKN- 75 201/21/4/2308/012/ FEW SC DSNT OFFSHR ENE-ESE AND SSE-SW/ 8/504 58022 10022 20004 SUMMARY FOR THURSDAY, FEBRUARY 11, 2016 TEMPERATURE (DEGREES F) MAX.....26 NORMAL.....36 MIN......7 NORMAL.....18 MEAN....17 NORMAL.....27 DEPARTURE FROM 30-YEAR NORMAL........................-10 TOTAL DEPARTURE FOR THE MONTH........................+75 [+6.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............48 DEPARTURE.........+10 TOTAL HEATING UNITS FOR THE MONTH.............349 DEPARTURE.........-76 TOTAL HEATING UNITS FOR THE SEASON...........3091 DEPARTURE........-865 TOTAL HEATING UNITS LAST SEASON TO DATE......3866 DIFFERENCE.......-775 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................39 W AT 6:34 P.M. ASOS........................45 W AT 7:29 P.M. DAVIS.......................41 WNW AT 6:45 P.M. RMY 42 FASTEST MILE FOR YESTERDAY.....................32 W AT 6:29 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................31 W AT 6:45 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................27 WNW AT 6:30 P.M. AVERAGE WIND SPEED AND DIRECTION..............17.3 SW ASOS.......................17.0 DAVIS......................14.7 WNW [294 Deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE DEPARTURE......-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.11 DEPARTURE......+1.62 ASOS..............3.15 TOTAL PRECIPITATION FOR THE YEAR...........6.88 DEPARTURE......+1.04 ASOS..............7.09 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE DEPARTURE.......-0.5 TOTAL SNOWFALL FOR THE MONTH...............21.3 DEPARTURE......+15.9 TOTAL SNOWFALL FOR THE SEASON..............36.9 DEPARTURE.......-1.6 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/ AERO/RMY GUST AERO: Aerovane wind recording system gust RMY: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 2/1 64/40/52/+26/0.00/0.0/.../.. 36 WNW AERO 37 W RMY 34 2/2 48/31/40/+14/0.00/0.0/.../.. 23 NW AERO 23 WNW RMY N/A 2/3 55/34/45/+19/0.80/0.0/000/00 55 SSE AERO 58 SSE RMY 53 2/4 55/39/47/+21/..../0.0/000/00 37 W AERO 36 W RMY 35 2/5 39/19/29/+3/..../12.5/000/00 37 NNW AERO 39 NNW RMY 35 2/6 35/17/26/0/0.00/0.0/.../.. 25 SSW AERO 24 SSW RMY 23 2/7 43/26/35/+8/0.00/0.0/.../.. 35 ENE AERO 35 ENE RMY N/A 2/8 36/16/26/-1/..../.../000/00 53 NE AERO 55 NE RMY 53 2/9 26/17/22/-5/..../.../000/00 21 N AERO 22 N RMY N/A 2/10 33/21/27/+0/0.01/0.0/.../.. 23 W AERO 23 W RMY 21 2/11 26/7/17/-10/T/T/.../.. 39 W AERO 47 W RMY 42 2/12 morning low temp. since midnight 2F; normal now 19F DAILY RECORDS FOR FEBRUARY 2016 -NONE SO FAR- DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 12 HIGH 56F IN 1999 LOW -14F IN 1914 PRECIP 4.85 INCHES IN 1886 [RECORD FOR MONTH] SNOWFALL 15.0 INCHES IN 2006 PEAK GUST 70 MPH E IN 1985 RECORDS FOR FEBRUARY 13 HIGH 64F IN 1951 LOW -10F IN 1967 PRECIP 2.80 INCHES IN 2008 SNOWFALL 13.5 INCHES IN 1894 PEAK GUST 60 MPH SE IN 1972 TODAY'S REPORT PREPARED BY: Brian Fitzgerald