BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, FEBRUARY 24, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME RAINY DAY WITH FOG LIMITING VISIBILITY AND AN EXTREME DROP IN PRESSURE.... Rain started this morning some time between 6 and 7 A.M. accumulating about 0.34 inches so far. Fog has obstructed visibility to 1/8th mile at each observation. Pressure has been falling exceptionally quickly today, with a drop of 5.7 millibars just between 11 o'clock and 12 o'clock. Wind during this time increased to over 30 knots, directly correlating with the rapidly dropping pressure. We experienced bombogenesis between 1 P.M. yesterday and 1 P.M. today with a total pressure drop during this period of 28.6 millibars. The high temperature so far is 40F, 1 degree above the normal maximum temperature for today of 39F. Our low since midnight was 30F, 9 degrees above our normal minimum of 21F. Pressure has been falling exceptionally quickly today, with a drop of 5.7 millibars just between 11 o'clock and 12 o'clock. Today's Observations: 7 A.M. Weather: Light rain, fog Temperature: 33F; Dew Point: 33F; Wind: ESE at 11G18 kts Sea-level pressure: 30.03 ins. Hg, falling, then more quickly Visibility: 1/8 mile, fog 6-hr Max temp: 33F 6-hr Min temp: 30F 24-hr Precip: 0.02 ins. 24-hr snowfall: 0.0 ins. Snow depth: 2 ins. BHO SA 1155 W3 X 1/8R-F 171/33/33/1111G18/003/ 8//// 4/002 58044 6002/ 70002 10033 20030 10 A.M. Weather: Light rain, fog Temperature: 35F; Dew Point: 35F; Wind: E at 16G26 kts Peak wind: 27 knots E at 9:24 A.M. Sea-level pressure: 29.87 ins. Hg, falling then more quickly Visibility: 1/8 mile, fog 3-hr Precip: 0.14 ins. BHO SA 1455 W3 X 1/8R-F 117/35/35/0916G26/987/ PK WND 0927/24/ 8//// 58054 6014/ 1 P.M. Weather: Light rain, fog Temperature: 40F; Dew Point: 40F; Wind: ESE at 9 kts Peak wind: 34 knots ESE at 11:56 A.M. Sea-level pressure: 29.58 ins. Hg, falling unsteadily Visibility: 1/8 mile, fog 6-hr Max temp: 40F 6-hr Min temp: 33F 6-hr Precip: 0.32 ins. 6-hr snowfall: 0.0 ins. Snow depth: 2 ins. BHO SA 1755 W3 X 1/8R-F 016/40/40/1209/958/ PK WND 1234/1656/ 8//// 4/002 57101 6032/ 10040 20033 SUMMARY FOR SATURDAY, FEBRUARY 23, 2019 TEMPERATURE (DEGREES F) MAX.....38 NORMAL.....39 MIN.....24 NORMAL.....21 MEAN....31 NORMAL.....30 DEPARTURE FROM 30-YEAR NORMAL........................+1 TOTAL DEPARTURE FOR THE MONTH.......................+68 [+2.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............34 DEPARTURE.........-1 TOTAL HEATING UNITS FOR THE MONTH.............794 DEPARTURE........-70 TOTAL HEATING UNITS FOR THE SEASON...........4289 DEPARTURE.......-105 TOTAL HEATING UNITS LAST SEASON TO DATE......4008 DIFFERENCE......+281 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................18 NNW AT 1:20 A.M. AERO.........................16 NNW AT 1:18 A.M. ASOS.........................19 N AT 1:19 A.M. DAVIS........................18 NW AT 1:19 A.M. RMY N/A FASTEST MILE FOR YESTERDAY......................13 NNW AT 1:12 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................14 N AT 1:20 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................14 NW AT 1:20 A.M. AVERAGE WIND SPEED AND DIRECTION...............6.5 NNW ASOS........................6.6 DAVIS......................6.9 W [265 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02 DEPARTURE.......-0.14 ASOS..............0.02 TOTAL PRECIPITATION FOR THE MONTH..........2.93 DEPARTURE.......-0.33 ASOS..............2.90 TOTAL PRECIPITATION FOR THE YEAR...........8.28 DEPARTURE.......+0.67 ASOS..............8.38 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE........-0.5 TOTAL SNOWFALL FOR THE MONTH................8.6 DEPARTURE........-2.9 TOTAL SNOWFALL FOR THE SEASON..............21.0 DEPARTURE.......-23.6 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 M: Missing data 02/01 19/5/12/-14/0.00/0.0/552/95 29 W AERO 28 W RMY N/A 02/02 30/7/19/-7/0.00/0.0/318/55 32 WSW AERO 32 WSW RMY 31 02/03 38/27/26/+7/0.00/0.0/126/22 26 S AERO 25 S RMY N/A 02/04 59/33/46/+20/0.00/0.0/540/93 25 SSW AERO 28 SSW RMY N/A 02/05 62/39/51/+25/0.00/0.0/354/60 30 WNW AERO 29 WNW RMY 32 02/06 39/28/34/+8/..../.../396/67 24 NNW AERO 23 NNW RMY N/A 02/07 37/31/34/+7/..../.../000/00 28 ENE AERO 24 ENE RMY 28 02/08 51/27/39/+12/..../.../204/34 46 W AERO 46 WNW RMY 51 02/09 32/20/26/-1/0.00/0.0/594/100 50 WNW AERO 52 WNW RMY 52 02/10 33/18/26/-1/0.00/0.0/510/85 24 WNW AERO 23 WNW RMY 25 02/11 34/21/28/+1/0.00/0.0/318/53 24 NNW AERO 23 NNW RMY 25 02/12 33/13/23/-4/..../2.8/000/00 32 E AERO 30 E RMY 26 02/13 39/29/34/+6/..../0.1/018/03 36 W AERO 32 W RMY 36 02/14 37/26/32/+4/0.00/0.0/.../.. 44 WNW AERO 42 WNW RMY 45 02/15 49/29/39/+11/0.11/0.0/.../.. 40 S AERO 40 S RMY 44 02/16 44/26/35/+7/0.00/0.0/.../.. 25 NW AERO 25 NW RMY N/A 02/17 37/19/28/0/..../.../.../.. 30 NNW AERO 25 NNW RMY N/A 02/18 30/16/23/-6/..../.../.../.. 35 NW AERO 36 NW RMY 41 02/19 30/10/20/-9/0.00/0.0/.../.. 35 NW AERO 33 NW RMY N/A 02/20 26/12/19/-10/..../.../.../.. 16 WNW AERO 14 SSW RMY N/A 02/21 43/21/32/+3/..../.../.../.. 36 W AERO 33 W RMY 38 02/22 43/30/37/+8/..../0.0/.../.. 22 NW AERO 21 NW RMY 23 02/23 38/24/31/+1/0.00/0.0/.../.. 18 NNW AERO 16 NNW RMY N/A 02/24 Low temp since midnight is 30F; normal low is 21F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 24 HIGH 71F IN 2017 LOW -11F IN 1894 PRECIP 3.10 INCHES IN 1969 SNOWFALL 27.4 INCHES IN 1969 [HIGHEST CALENDAR DAY AMOUNT ON RECORD] PEAK GUST 63 MPH NE IN 1998 RECORDS FOR FEBRUARY 25 HIGH 68F IN 2017 LOW -10F IN 1894 PRECIP 2.40 INCHES IN 1981 SNOWFALL 13.6 INCHES IN 1966 PEAK GUST 76 MPH S IN 2016 TODAY'S REPORT PREPARED BY: Samantha Richard