BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, APRIL 23, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME FOGGY, CHILLY, DRIZZLY, AND BREEZY Today's weather conditions have felt far from spring-like. The temperature has been relatively steady, only managing to move up to 40F from a morning low of 38F. The day will likely average close to 10 degrees below the 30-year normal for the date. The summit has been shrouded in fog all day, with visibility varying between 1/8th and 1/2 mile. Drizzle has been continuous and very light today. Only 0.04 inch of precipitation has fallen all day. A NE wind has been fairly steady in the 10-20 mph range, with regular gusts in the 20-30 mph range. The wind direction this afternoon has slowly started to back around to the NNE as the coastal low responsible for this lousy weather gets closer to New England. Today's observations: 7 A.M. Weather: Sky obscured by light drizzle and dense fog, stratus drifting over summit, light drizzle becoming very light and unknown time and continuing Temperature: 38F; Dew Point: 38F; Wind: NE at 11 kts, Wind: Direction variable N-E Sea-level pressure: 30.47 ins. Hg, falling then steady Visibility: 1/4 mile, variable 1/8 to 1/2 mile, light drizzle and dense fog 24-hr precip: 0.02 inch 6-hr precip: 0.02 inch 6-hour min. temp: 38F BHO SA 1155 W3 X 1/4VL-F 319/38/38/0511/047/ STRA DRFTNG OVR SMT VSBY 1/8V1/2 WND 36V08 L- BCMG VRY LGT UKN CTD/ 8//// 56007 ASOS 70002 MANUAL 70002 ASOS 60002 MANUAL 60002 10038 20038 10 A.M. Weather: Sky obscured by light drizzle and dense fog, stratus drifting over summit, light drizzle continued mostly very light Temperature: 39F; Dew Point: 39F; Wind: E at 13G22 kts, Wind: Direction variable N-E Sea-level pressure: 30.43 ins. Hg, falling Visibility: 1/8 mile, light drizzle and dense fog 3-hr precip: 0.02 inch BHO SA 1455 W3 X 1/8L-F 305/39/39/0513G22/043/ STRA DRFTNG OVR SMT WND 36V08 L- CTD MSTLY VRY LGT/ 8//// 58014 ASOS 60003 MANUAL 60002 1 P.M. Weather: Sky obscured by light drizzle and dense fog, stratus drifting over summit, light drizzled continued very light Temperature: 40F; Dew Point: 40F; Wind: NNE at 12G20 kts, Wind: Direction variable NNW-ENE Sea-level pressure: 30.36 ins. Hg, falling Visibility: 1/4 mile, variable 1/8 to 1/2 mile, light drizzle and dense fog 6-hr precip: 0.02 inch 6-hour max temp: 40F BHO SA 1755 W3 X 1/4VL-F 280/40/40/0312G20/036/ STRA DRFTNG OVR SMT VSBY 1/8V1/2 WND 35V07 WND GRDLY BACKING PST HR L- CTD VRY LGT/ 8//// 58025 ASOS 60003 MANUAL 60002 10040 20038 WEATHER SUMMARY FOR MONDAY, APRIL 22 TEMPERATURE (DEGREES F) MAX.....49 NORMAL.....58 MIN.....35 NORMAL.....40 MEAN....42 NORMAL.....49 DEPARTURE FROM 30-YEAR NORMAL....................-7 TOTAL DEPARTURE FOR THE MONTH...................+31 [+1.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............23 DEPARTURE..........+7 TOTAL HEATING UNITS FOR THE MONTH...........406 DEPARTURE.........-31 TOTAL HEATING UNITS FOR THE SEASON.........5426 DEPARTURE........-495 TOTAL HEATING UNITS LAST SEASON TO DATE....4584 DIFFERENCE.......+842 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...............32 E AT 8:50 A.M. AERO....................28 E AT 8:43 A.M. ASOS....................32 E AT 8:50 A.M. DAVIS...................30 E AT 8:43 A.M. RMY: 33 THE FASTEST MILE FOR YESTERDAY.............24 E AT 11:50 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE..............24 E AT 11:45 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.............22 E AT 11:45 A.M. AVERAGE WIND SPEED AND DIRECTION.........13.6 E ASOS..................12.9 DAVIS.................11.9 ENE [071 deg] *last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02 DEPARTURE...........-0.12 ASOS..............0.02 TOTAL PRECIPITATION FOR THE MONTH..........1.75 DEPARTURE...........-1.73 ASOS..............1.70 TOTAL PRECIPITATION FOR THE YEAR..........15.84 DEPARTURE...........-1.64 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals 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............-2.8 TOTAL SNOWFALL FOR THE SEASON.............99.0 DEPARTURE...........+36.5 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 4/1 61/31/46/+5/0.34/0.0/458/60 40 W AERO 44 MPH WNW RMY 46 TSTM 4/2 40/27/34/-7/T/T/460/60 45 W AERO 42 MPH W RMY 47 4/3 45/27/36/-6/0.00/0.0/755/98 44 W AERO 43 MPH W RMY 47 4/4 55/26/41/-1/0.00/0.0/719/93 30 WSW AERO 27 MPH WSW RMY 31 4/5 59/36/48/+5/0.00/0.0/403/52 33 NNW AERO 28 MPH NNW RMY 38 4/6 47/30/39/-4/0.00/0.0/747/96 38 NW AERO 35 MPH NW RMY 40 4/7 52/31/42/-1/0.00/0.0/391/50 51 S AERO 46 MPH S RMY 50 4/8 65/43/54/+10/T/0.0/494/63 29 SSW AERO 22 MPH SSW RMY N/A 4/9 72/44/58/+14/T/0.0/456/58 35 WNW AERO 35 MPH WNW RMY 39 TSTM 4/10 64/43/54/+9/0.13/0.0/426/54 23 SE AERO 20 MPH SE RMY 25 4/11 52/40/46/+1/0.09/0.0/063/08 18 ENE AERO 14 MPH ENE RMY N/A 4/12 40/34/37/-8/0.58/T/000/00 38 E AERO 32 MPH E RMY 41 4/13 52/34/43/-3/0.04/0.0/128/16 31 NNE AERO 27 MPH NNE RMY 21 4/14 52/36/44/-2/0.00/0.0/216/27 31 WNW AERO 27 MPH WNW RMY 32 4/15 55/35/45/-2/0.00/0.0/514/64 21 ESE AERO 15 MPH S RMY N/A 4/16 62/38/50/+3/T/0.0/540/67 44 S AERO 40 MPH S RMY 45 4/17 67/48/58/+11/T/0.0/769/95 29 SSW AERO 25 MPH SSW RMY N/A 4/18 65/43/54/+6/0.00/0.0/503/62 30 S AERO 25 MPH S RMY N/A 4/19 72/50/61/+13/.../0.0/195/24 47 SSW AERO 48 MPH SSW RMY 50 4/20 62/39/51/+2/..../0.0/147/18 43 SSW AERO 41 MPH SSW RMY N/A 4/21 53/31/42/-7/0.00/0.0/819/100 31 WNW AERO 25 MPH WNW RMY N/A 4/22 49/35/42/-7/..../0.0/.../.. 32 E AERO 28 MPH E RMY 33 4/23 morning low temp: 38F; the normal low is now 41F DAILY RECORDS FOR APRIL 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 23 HIGH 85 IN 1908, 2007 LOW 25 IN 1933,1989 PRECIP 1.99 IN. IN 2012 SNOWFALL 2.0 IN. IN 2012 PEAK GUST 64 MPH WNW IN 1962 RECORDS FOR APRIL 24 HIGH 82 IN 2001 LOW 22 IN 1930 PRECIP 2.51 INS IN 1898 SNOWFALL 1.2 INS IN 1967 PEAK GUST 59 MPH NW IN 1962 TODAY'S REPORT PREPARED BY: Sean Fankhauser