BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, APRIL 18, 2014 ALL TIMES ARE IN EASTERN STANDARD TIME STRATOCUMULUS AND COLD CONTINUE THROUGH TODAY WITH OVERCAST SKIES. For a second day in a row winds from the NE at the surface have brought chilly temperatures and thick stratocumulus from offshore. With only a maximum of 42F so far today after yesterday's 13 degree temperature from the 30 year norm, it appears Friday will be another colder-than-average day. A trace of frozen and liquid equivalent fell yesterday as snow flurries during yesterday afternoon. By 7:00 AM EST this morning no snow was left on the ground. Barometric pressure has also been significantly high the past few days, with yesterday's maximum sea level pressure of 30.80 inches of mercury representing the highest pressure since 30.81 inches in March 21, 2007 and 30.84 in January of 1999. Today's Observations: 7 A.M. Weather: Thin overcast of stratocumulus, breaks in the overcast overhead Temperature: 35F; Dew Point: 28F; Wind: ENE at 11G18 kts. Sea-level pressure: 30.54 ins. Hg, falling unsteadily Visibility: 25 miles, distant haze 6-hr max temp: 35F 6-hr min temp: 28F 24-hr precip: TRACE 24-hr snowfall: TRACE Snow depth on ground: 0 BHO SA 1155 E18 OVC- 25 343/35/28/0611G18/054/ BINOVC OVHD HZ DSNT ALQDS/ 8/5// 57018 10035 20028 10 A.M. Weather: Overcast stratocumulus Temperature: 38F; Dew Point: 29F; Wind: ENE at 8 kts, Sea-level pressure: 30.55 ins. Hg, rising then falling but higher still Visibility: 25 miles, distant haze BHO SA 1455 E20 OVC 25 346/38/29/0608/055/ HZ DSNT ALQDS/ 8/5// 50003 1 P.M. Weather: Overcast stratocumulus, hazy Temperature: 40F; Dew Point: 29F; Wind: ENE at 7 kts Sea-level pressure: 30.47 ins. Hg, decreasing, then more slowly Visibility: 20 miles, 15 miles NNW-NNE, distant haze 6-hr max temp: 42F 6-hr min temp: 35F BHO SA 1755 E20 OVC 20 320/40/29/0607/047/ HZ DSNT ALQDS VSBY NNW-NNE 15 MI/ 8/5// 56026 10042 20035 WEATHER SUMMARY FOR THURSDAY, APRIL 17, 2014 TEMPERATURE (DEGREES F) MAX.....39 NORMAL.....56 MIN.....29 NORMAL.....38 MEAN....34 NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL........................-13 TOTAL DEPARTURE FOR THE MONTH........................+59 [+3.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............31 DEPARTURE.........+13 TOTAL HEATING UNITS FOR THE MONTH.............295 DEPARTURE.........-59 TOTAL HEATING UNITS FOR THE SEASON...........5922 DEPARTURE.........+84 TOTAL HEATING UNITS LAST SEASON TO DATE......5350 DIFFERENCE.......+572 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................35 NE AT 8:34 A.M. AERO.......................N/A ASOS.......................33 NE AT 7:45 A.M. DAVIS......................31 NNE AT 8:34 A.M. RMY 34 FASTEST MILE FOR YESTERDAY....................24 NNE AT 7:45 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................23 NE AT 7:46 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................22 NE AT 7:46 A.M. AVERAGE WIND SPEED AND DIRECTION............12.6 NE ASOS.....................12.6 DAVIS....................11.0 NE [51 deg] * last of several occurrences... 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..........2.86 DEPARTURE.............+0.06 ASOS..............2.84 TOTAL PRECIPITATION FOR THE YEAR..........17.98 DEPARTURE.............+1.18 ASOS.............18.38 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE DEPARTURE..............-0.1 TOTAL SNOWFALL FOR THE MONTH................0.8 DEPARTURE..............-1.6 TOTAL SNOWFALL FOR THE SEASON..............85.6 DEPARTURE.............+23.5 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 morning low temp: 28F; 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 18 HIGH 92 IN 1976 LOW 23 1887 PRECIP 1.48 IN 1954 SNOWFALL 3.7 IN. IN 1965 PEAK GUST 59 MPH S IN 1982 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 TODAY'S REPORT PREPARED BY: Brian Fitzgerald