BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, APRIL 16, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME DRY CONDITIONS CONTINUE, DEW POINTS REMAIN IN THE TEENS TODAY Clear and very dry conditions persisted into Thursday, and temperatures tried to rebound from an overnight low of 42F. Gusty NNW winds from yesterday calmed overnight, and shifted largely to the East, keeping temperatures suppressed in the 50s thanks to a very cold ocean. By the 1:00 PM EST observation clear skies remained, with broken cirrus overhead. Light haze was visible in most directions, limiting visibility to 70 miles in all directions. A maximum of 63F was reached by the 1:00 PM EST reading. ----------------------------------------------------- Today's Observations: 7 A.M. Weather: Clear, few cirrus distant SSE-W Temperature: 49F; Dew Point: 20F; Wind: estimated ENE at 3 kts, Wind Speed: Light Sea-level pressure: 30.49 ins. Hg, increasing then more slowly Visibility: 70 miles, light distant haze 6-hr Max temp: 49F 6-hr Min temp: 42F 24--hour precip: None BHO SA 1155 CLR 70 325/49/20/E0603/049/ FEW CI DSNT SSE-W LGT DSNT HZ ALQDS WND LGT/ 8/001 51018 10049 20042 10 A.M. Weather: Scattered cirrus Temperature: 53F; Dew Point: 14F; Wind: estimatd E at 5 kts, Wind Speed and Direction: Light and Variable Sea-level pressure: 30.49 ins. Hg, about the same Visibility: 70 miles, light distant haze BHO SA 1455 250 SCT 70 325/53/14/E0905/049/ LGT DSNT HZ ALQDS WND LGT AND VRB/ 8/001 50000 1 P.M. Weather: Broken cirrus Temperature: 63F; Dew Point: 20F; Wind: estimated S at 6 kts Wind Speed: Light Sea-level pressure: 30.42 ins. Hg, falling then more quickly Visibility: 70 miles, light distant haze 6-hr Max temp: 63F 6-hr Min temp: 49F BHO SA 1755 E250 BKN 70 302/63/20/E1806/042/ LGT DSNT HZ ALQDS WND LGT/ 8/001 58023 10063 20049 SUMMARY FOR WEDNESDAY, APRIL 15, 2015 TEMPERATURE (DEGREES F) MAX.....67 NORMAL.....56 MIN.....45 NORMAL.....38 MEAN....56 NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL.......................+9 TOTAL DEPARTURE FOR THE MONTH......................+18 [+1.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............9 DEPARTURE...........-9 TOTAL HEATING UNITS FOR THE MONTH.............300 DEPARTURE..........-19 TOTAL HEATING UNITS FOR THE SEASON...........6043 DEPARTURE.........+241 TOTAL HEATING UNITS LAST SEASON TO DATE......5862 DIFFERENCE........+181 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................32 NW AT 3:06 P.M. ASOS.......................35 NW AT 3:05 P.M. DAVIS......................32 NNW AT 3:05 P.M. RMY 33 FASTEST MILE FOR YESTERDAY....................26 NW AT 3:04 P.M.* MAXIMUM 2-MINUTE ASOS AVERAGE.................25 NW AT 3:05 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................24 NW AT 3:06 P.M. AVERAGE WIND SPEED AND DIRECTION............13.0 NNW ASOS.....................13.8 DAVIS....................10.8 NNW [327 degrees] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.....-0.15 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........1.48 DEPARTURE.....-1.03 ASOS...............1.43 TOTAL PRECIPITATION FOR THE YEAR...........16.07 DEPARTURE.....-0.31 ASOS................N/A *** *** ASOS annual totals not available due to erroneous readings SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M...........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH...............TRACE DEPARTURE.....-2.2 TOTAL SNOWFALL FOR THE SEASON..............150.8 DEPARTURE....+88.9 PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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 44/26/35/-6/0.00/0.0/748/98 30 WNW RMY 31 4/2 59/29/44/+3/T/0.0/375/49 39 SSW RMY 43 4/3 56/47/52/+10/0.02/0.0/000/00 36 SW RMY N/A 4/4 49/32/41/-1/..../0.0/501/65 54 NW RMY 64 4/5 47/30/39/-4/..../0.0/464/60 40 W RMY 45 4/6 48/33/41/-2/0/00/0.0/544/70 18 NE RMY N/A 4/7 39/34/37/-6/..../0.0/000/00 21 NE RMY N/A 4/8 41/32/37/-7/..../T/000/00 30 ENE RMY 32 4/9 35/32/34/-10/..../0.0/000/00 31 ENE RMY 32 4/10 53/35/44/-1/..../0.0/000/00 31 SW RMY N/A 4/11 56/38/46/+1/0.00/0.0/.../.. 39 WNW RMY 48 4/12 68/35/52/+7/0.00/0.0/.../.. 23 WNW RMY 23 4/13 69/47/58/+12/0.00/0.0/.../.. 35 SSW RMY N/A 4/14 65/51/58/+12/0.05/0.0/.../.. 37 SSW RMY N/A 4/15 67/45/56/+9/0.00/0.0/.../.. 32 NW RMY 33 4/16 low since midnight is 42F normal low is 38F DAILY RECORDS FOR APRIL 2015 4/3 - NEW RECORD DAILY HIGH MINIMUM TEMPERATURE: 47F surpasses the previous record of 46F in 1892 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 16 HIGH 89 IN 2012 LOW 23 IN 1943 PRECIP 2.45 IN. IN 1929 SNOWFALL 2.0 IN. IN 1904, 1962 PEAK GUST 73 MPH E IN 2007 RECORDS FOR APRIL 17 HIGH 93 IN 2002 LOW 21 IN 1908 PRECIP 1.68 IN 1954 SNOWFALL 1.0 IN. IN 1899 PEAK GUST 63 MPH ESE IN 2011 TODAY'S REPORT PREPARED BY: Brian Fitzgerald