BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, FEBRUARY 21, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME GOOD VISIBILITY AND INCREASING WIND FOLLOWING THE WINTER WEATHER THIS MORNING.... Pressure dropped almost 25 millibars with the winter precipitation, and has changed little since this morning. Freezing fog and drizzle subsided following the 10 A.M. observation. We measured another inch of snowfall at 7 A.M., with 0.45 inches of liquid. Since then, only a trace was seen. Fog this morning limited visibility to a 1/16th mile, a fair contrast to the 70 miles seen at 1 P.M. Wind has increased since noontime, with an average speed of 20 mph from the west. The peak gust so far today is 36 mph. The high temperature so far today is 41F, 3 degrees above our normal high temperature of 38F. The low since midnight is 21F, a degree above the daily normal minimum of 20F. Today's Observations: 7 A.M. Weather: Very light drizzle Temperature: 29F; Dew Point: 29F; Wind: NW at 7 kts Sea-level pressure: 29.85 ins. Hg, falling rapidly Visibility: 1/16 mile, fog 6-hr Max temp: 29F 6-hr Min temp: 22F 24-hr Precip: 0.45 ins. 24-hr snowfall: 1.0 ins. Snow depth: 4 ins. BHO SA 1155 X W3 1/16L-F 109/29/29/3407/985/ L-CTD PCPN VRY LGT/ 8//// 4/004 70045 58023 10029 20022 10 A.M. Weather: Fog Temperature: 30F; Dew Point: 30F; Wind: NW at 7 kts Sea-level pressure: 29.84 ins. Hg, falling steadily Visibility: 1/16 mile, fog 3-hr Precip: Trace BHO SA 1455 X W3 1/16F 107/30/30/3007/984/ 8//// 600// 58002 1 P.M. Weather: Broken altocumulus and cirrocumulus, few stratus fractus in all directions Temperature: 40F; Dew Point: 34F; Wind: NW at 21G26 kts, Peak wind: 30 MPH (26 kts) NW at 12:49 P.M. Sea-level pressure: 29.983 ins. Hg, falling steadily Visibility: 70 miles 6-hr Max temp: 41F 6-hr Min temp: 28F 6-hr Precip: Trace 6-hr snowfall: 0.0 ins. Snow depth: 3 inches BHO SA 1755 E65 BKN 200 BKN 70 105/40/34/3021G26/983/ FEW STFA ALQDS PK WND 3026/49/ 8/789 4/003 600// 58002 10041 20028 SUMMARY FOR WEDNESDAY, FEBRUARY 20, 2019 TEMPERATURE (DEGREES F) MAX.....26 NORMAL.....38 MIN.....12 NORMAL.....20 MEAN....19 NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL.......................-10 TOTAL DEPARTURE FOR THE MONTH.......................+56 [+2.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............46 DEPARTURE........+10 TOTAL HEATING UNITS FOR THE MONTH.............699 DEPARTURE........-58 TOTAL HEATING UNITS FOR THE SEASON...........4195 DEPARTURE........-92 TOTAL HEATING UNITS LAST SEASON TO DATE......3950 DIFFERENCE......+245 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................16 WNW AT 12:03 A.M. AERO.........................14 SSW AT 3:33 P.M. ASOS.........................16 NW AT 12:25 A.M. DAVIS........................18 S AT 4:46 P.M. RMY N/A FASTEST MILE FOR YESTERDAY......................13 WNW AT 12:08 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................13 WNW AT 12:08 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................13 W AT 12:08 A.M. AVERAGE WIND SPEED AND DIRECTION..............7.3 WNW ASOS.......................7.4 DAVIS......................7.7 SW [226 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.45 DEPARTURE.......+0.30 ASOS..............0.43 TOTAL PRECIPITATION FOR THE MONTH..........2.91 DEPARTURE.......+0.10 ASOS..............2.88 TOTAL PRECIPITATION FOR THE YEAR...........8.26 DEPARTURE.......+1.10 ASOS..............8.36 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........1.0 DEPARTURE........+0.5 TOTAL SNOWFALL FOR THE MONTH................8.6 DEPARTURE........-1.3 TOTAL SNOWFALL FOR THE SEASON..............21.0 DEPARTURE.......-22.0 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/..../4.7/.../.. 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 Low temp since midnight is 21F; normal low is 20F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 21 HIGH 70F IN 2018 LOW -6F IN 1950 PRECIP 2.42 INCHES IN 1898 SNOWFALL 9.0 INCHES IN 1929 PEAK GUST 72 MPH WNW IN 1967 RECORDS FOR FEBRUARY 22 HIGH 63F IN 1997 LOW -1F IN 1918 PRECIP 1.38 INCHES IN 1900 SNOWFALL 8.0 INCHES IN 1893 PEAK GUST 74 MPH S IN 1974 TODAY'S REPORT PREPARED BY: Benjamin Turner