BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL 19, 2014 ALL TIMES ARE IN EASTERN STANDARD TIME COOL AND MOSTLY SUNNY WITH A FEW HIGH AND LOW CLOUDS... It was another chilly morning on the summit with a low temperature of 35 deg F in the early hours of the day. There were only a few thin cirrus early this morning, though a few low clouds formed during the morning. The wind has been increasing during the day with gusts reaching 29 mph as of early afternoon with the wind direction mainly from the NW-NNW. The temperature has climbed above the normal high in the upper 50s by early afternoon, so today will be close to average or a little warmer after three very cold days for mid-April. With a dew point in the upper 20s this afternoon, the relative humidity has also dropped under 30%. Visibility remains moderate, climbing from 30 miles earlier to near 50 miles at the early afternoon observation. Today's Observations: 7 A.M. Weather: Thin scattered cirrus, hazy Temperature: 41F; Dew Point: 31F; Wind: W at 10 kts. Sea-level pressure: 30.19 ins. Hg, falling slightly Visibility: 30 miles, hazy 6-hr max temp: 41F 6-hr min temp: 36F 24-hr precip: 0.0 BHO SA 1155 250 –SCT 30 225/41/31/2810/019/ HAZY/ 8/001 56002 10041 20036 10 A.M. Weather: Scattered cumulus, thin scattered cirrus, few cumulus fractus all quadrants Temperature: 55F; Dew Point: 34F; Wind: NNW at 12G21 kts, Sea-level pressure: 30.21 ins. Hg, rising Visibility: 35 miles, hazy BHO SA 1455 45 SCT 250 –SCT 35 230/55/34/3312G21/021/ FEW CUFRA ALQDS HAZY/ 8/101 53005 1 P.M. Weather: Scattered cumulus, few cirrus distant SE-SE, hazy Temperature: 60F; Dew Point: 28F; Wind: NW at 13G23 kts Sea-level pressure: 30.20 ins. Hg, decreasing, then increasing Visibility: 50 miles, hazy 6-hr max temp: 61F 6-hr min temp: 41F BHO SA 1755 45 SCT 50 226/60/28/3213G23/020/ FEW CI DSNT SE-SW HAZY/ 8/101 55004 10061 20041 WEATHER SUMMARY FOR FRIDAY, APRIL 18, 2014 TEMPERATURE (DEGREES F) MAX.....42 NORMAL.....57 MIN.....28 NORMAL.....39 MEAN....35 NORMAL.....48 DEPARTURE FROM 30-YEAR NORMAL........................-13 TOTAL DEPARTURE FOR THE MONTH........................+46 [+2.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............30 DEPARTURE.........+13 TOTAL HEATING UNITS FOR THE MONTH.............325 DEPARTURE.........-47 TOTAL HEATING UNITS FOR THE SEASON...........5952 DEPARTURE.........+97 TOTAL HEATING UNITS LAST SEASON TO DATE......5361 DIFFERENCE.......+591 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................25 E AT 7:42 A.M. AERO.......................N/A ASOS.......................25 ENE AT 6:59 A.M. DAVIS......................24 NE AT 7:18 A.M. RMY 25 FASTEST MILE FOR YESTERDAY....................18 NE AT 7:41 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................20 NE AT 7:43 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................17 NE AT 7:43 A.M. AVERAGE WIND SPEED AND DIRECTION.............9.5 ENE ASOS......................8.7 DAVIS.....................7.8 ENE [69 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.............-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.86 DEPARTURE.............-0.08 ASOS..............2.84 TOTAL PRECIPITATION FOR THE YEAR..........17.98 DEPARTURE.............+1.04 ASOS.............18.38 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE..............-0.1 TOTAL SNOWFALL FOR THE MONTH................0.8 DEPARTURE..............-1.7 TOTAL SNOWFALL FOR THE SEASON..............85.6 DEPARTURE.............+23.4 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2014 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: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 4/1 48/31/40/-1/0.00/0.0/694/91 29 NNE AERO N/A RMY N/A 4/2 56/34/45/+4/0.00/0.0/452/69 22 WSW AERO 20 MPH WSW RMY N/A 4/3 55/36/46/+4/0.00/0.0/707/92 23 NNW AERO 22 MPH NW RMY 25 4/4 47/35/41/-1/0.31/0.0/255/33 26 ESE AERO N/A RMY 25 4/5 51/33/42/-1/0.19/0.0/186/24 39 WNW AERO N/A RMY 40 4/6 58/29/44/+1/0.00/0.0/755/97 25 W AERO N/A RMY N/A 4/7 59/44/52/+9/0.05/0.0/187/24 28 SSE AERO N/A RMY N/A 4/8 62/41/52/+8/0.61/0.0/016/02 45 W AERO N/A RMY 44 4/9 60/36/48/+4/0.00/0.0/707/90 35 NW AERO N/A RMY 36 4/10 57/33/45/0/0.00/0.0/742/94 38 S AERO N/A RMY 39 4/11 70/45/58/+13/T/0.0/.../.. 32 S AERO N/A RMY N/A 4/12 68/44/56/+11/0.00/0.0/.../.. 28 W AERO N/A RMY 28 4/13 65/45/55/+10/0.04/0.0/.../.. 35 S AERO N/A RMY N/A 4/14 73/55/64/+18/0.00/0.0/.../.. 55 SW AERO N/A RMY 62 4/15 66/38/52/+5/..../0.0/000/00 62 S AERO N/A RMY 68 4/16 43/28/36/-11/..../.../.../.. 39 NNW AERO N/A RMY 39 4/17 39/29/34/-13/T/T/.../.. 35 NE AERO N/A RMY 34 4/18 42/28/35/-13/0/0/.../.. 25 E AERO N/A RMY 25 4/19 morning low temp: 35F; the normal low is now 39F DAILY RECORDS FOR APRIL 2014 4/14 - Minimum temperature of 55F EQUALS RECORD HIGH MINIMUM FOR THIS DATE SET IN 1909. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 19 HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890 PRECIP 1.71 IN 1969 SNOWFALL 6.0 IN. IN 1887 PEAK GUST 66 MPH E IN 1984 RECORDS FOR APRIL 20 HIGH 88 IN 1927 LOW 18 IN 1897 PRECIP 1.14 IN 1972 SNOWFALL 2.5 IN. IN 1904, 1972 PEAK GUST 76 MPH WNW IN 1963 TODAY'S REPORT PREPARED BY: Mike Iacono