BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, APRIL 2, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear, few cirrus, thin smoke layer all quadrants except NE-S, patches of ground fog NE-SE, light haze Temperature: 50F, Dew point: 44F, Wind: NE at 4 kts Wind: Light Sea-level pressure: 30.21 inches Hg, rising Visibility: 35 miles 6-hour minimum temp: 46F BHO SA 1155 CLR 35 231/50/44/1404/021/ FEW CI THN K LYR ALQDS XCPT NE-S PTCHS GF NE-SE LGT HZ INVSN DSSPTNG WND LGT/ 8/001 53019 10050 20046 10 A.M. Weather: Clear, lone cumulus south, few cirrus, dark smoke layer NW-NNE, light haze Temperature: 60F, Dew point: 46F, Wind: ESE at 3 kts, Wind: Light and variable Sea-level pressure: 30.23 inches Hg, rising Visibility: 30 miles BHO SA 1455 CLR 30 237/60/46/1103/023/ LONE CU S FEW CI DRK K LYR NW-NNE LGT HZ WND LGT AND VRB/ 8/501 51006 1 P.M. Weather: Clear, few cirrus all quadrants, smoke layer NW to N Temperature: 66F, Dew point: 49F, Wind: NNE at 5 kts, Wind: Light and variable Sea-level pressure: 30.21 inches Hg, falling Visibility: 50 miles 6-hour maximum temp: 66F BHO SA 1755 CLR 50 229/66/49/0305/021/ FEW CI ALQDS K LYR NW-N WND LGT AND VRB/ 8/001 58008 10066 20050 WEATHER SUMMARY FOR THURSDAY, APRIL 1 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....50 MIN.....43 NORMAL.....33 MEAN....51 NORMAL.....41 DEPARTURE FROM 30-YEAR AVERAGE.............+10 TOTAL DEPARTURE FOR THE MONTH..............+10 HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............14 DEPARTURE.......-10 TOTAL HEATING UNITS FOR THE MONTH............14 DEPARTURE.......-10 TOTAL HEATING UNITS FOR THE SEASON.........5110 DEPARTURE......-378 TOTAL HEATING UNITS LAST SEASON TO DATE....5445 DIFFERENCE.....-335 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............24 NNW AT 5:21 A.M. AEROVANE..............30 NNW AT 5:39 A.M. ASOS..................26 N AT 6:20 A.M. DAVIS.................29 N AT 5:21 A.M. THE FASTEST MILE FOR YESTERDAY...........19 NNW AT 5:38 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............18 N AT 5:40 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 NNW AT 5:26 A.M. AVERAGE WIND SPEED AND DIRECTION.........7.5 NNW ASOS..................7.6 DAVIS.................7.6 N [356 DEG] * 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.........Trace DEPARTURE......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........27.91 DEPARTURE.....+14.13 ASOS.............28.10 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.2 TOTAL SNOWFALL FOR THE MONTH................7.9 DEPARTURE......-0.2 TOTAL SNOWFALL FOR THE SEASON..............64.4 DEPARTURE......+7.3 PRELIMINARY CLIMATE SUMMARY FOR MARCH 2010 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 when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 3/1 44/33/38/+6/0.38/3.2/047/07 43 NW AERO 42 MPH NW 3/2 43/32/38/+6/0/0/352/52 22 NNE 3/3 34/31/33/+1/0.18/1.7/000/00 45 NNE AERO 43 MPH NNE 3/4 33/30/32/-1/0.19/1.9/000/00 32 NNW 3/5 39/28/34/+1/0.06/0.5/226/33 28 N 3/6 54/27/41/+8/0/0/689/100 25 WNW 3/7 55/31/43/+10/0/0/684/99 28 W 3/8 58/36/47/+13/0/0/680/98 38 W 3/9 51/32/42/+8/0/0/656/94 31 WNW 3/10 53/30/42/+8/0/0/672/96 19 SE 3/11 46/35/41/+6/0.04/0/049/07 17 ENE 3/12 45/36/41/+6/T/0/007/01 26 NE 3/13 39/36/38/+3/1.60/0/000/00 53 NE AERO 50 MPH NE 3/14 45/38/42/+6/4.95/T/000/00 68 ENE AERO 67 MPH ENE 3/15 40/34/37/+1/2.86/0.2/000/00 53 NNE AERO 52 MPH NNE 3/16 49/34/42/+6/0/0/653/91 38 N AERO 35 MPH N 3/17 65/38/52/+15/0/0/698/97 24 WSW AERO 22 MPH WSW 3/18 65/43/54/+17/0/0/658/91 36 WSW AERO 32 MPH WSW 3/19 70/46/58/+21/0/0/661/91 23 SSW 3/20 71/47/59/+21/0/0/633/87 28 WSW 3/21 55/38/47/+9/0/0/643/88 26 NE 3/22 42/38/40/+2/0.05/0/000/00 36 NNE 3/23 44/39/42/+4/2.52/0/000/00 39 NNE 3/24 50/36/43/+4/0/0/511/69/ 48 W AERO 50 MPH W 3/25 64/38/51/+12/T/0/468/63/ 32 S AERO 37 MPH SSW 3/26 50/26/38/-1/0.26/0.4/112/15 32 NW AERO 35 MPH NW 3/27 39/21/30/-10/0/0/652/87 27 N 3/28 46/25/36/-4/0/0/413/55 29 SSE 3/29 52/42/47/+7/2.65/0/000/00 52 SE AERO 49 MPH SE 3/30 52/42/47/+6/2.92/0/000/00 46 ENE AERO 51 MPH ENE 3/31 47/40/44/+3/T/0/000/00 20 NNE AERO 21 MPH NNE 4/1 59/43/51/+10/T/0/359/47 24 NNW AERO 30 MPH NNW 4/2 our morning low temp: 46F; the normal low is now 33F NEW DAILY RECORDS FOR MARCH 2010 3/14 - new daily record rainfall of 4.95 ins. surpasses the previous record of 1.72 ins. in 1974 3/14 - new daily record peak wind gust of 67 MPH ENE surpasses the previous record of 66 MPH WNW in 1982 3/15 - new daily record rainfall of 2.86 ins. surpasses the previous record of 1.33 ins. in 1972 3/19 - new record high maximum temperature of 70F; the previous record was 69F in 1903. 3/20 - new record high minimum temperature of 47F; the previous record was 46F in 1976. 3/23 - new daily record rainfall of 2.52 ins. surpasses the previous record of 1.58 ins. in 1903 3/30 - new daily record rainfall of 2.92 ins. surpasses the previous record of 2.82 ins. in 2001 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 2 HIGH 77 IN 1967 LOW 14 IN 1919 PRECIP 1.83 IN. IN 1970 SNOWFALL 13.0 IN. IN 1887 PEAK GUST 76 MPH SSW IN 1970 RECORDS FOR APRIL 3 HIGH 76 IN 1892 LOW 16 IN 1894 PRECIP 2.18 IN. IN 1990 SNOWFALL 8.0 IN. IN 1915 PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH] TODAY'S REPORT PREPARED BY: Stephanie Radner