BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MARCH 27, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED Today's observations: 8 A.M. EDT Weather: High overcast, break in overcast NW-NE Temperature: 37F, Dew point: 21F, Wind: WSW at 12 kts Sea-level pressure: 30.09 inches Hg, rising Visibility: 40 miles 6-hour min temp: 35F BHO SA 1155 E250 OVC 40 188/37/21/2412/009/ BINOVC NW-NE INVSN PRSNT/ 8/007 53008 10038 20035 11 A.M. EDT Weather: Scattered altocumulus, overcast cirrostratus, partial halo Temperature: 47F, Dew point: 23F, Wind: WSW at 11 kts Sea-level pressure: 30.09 inches Hg, rising Visibility: 40 miles, light haze BHO SA 1455 180 SCT E220 OVC 40 189/47/23/2411/009/ PARTIAL HALO LGT HZ/ 8/037 50001 2 P.M. EDT Weather: Broken altocumulus, overcast cirrostratus Temperature: 50F, Dew point: 22F, Wind: SSW at 9 kts Sea-level pressure: 30.04 inches Hg, falling Visibility: 45 miles, light haze 6-hourly max. temp. 51F BHO SA 1755 E100 BKN 220 OVC 45 174/50/22/2109/004/ LGT HZ/ 8/037 55015 10051 20037 WEATHER SUMMARY FOR WEDNESDAY, MARCH 26 TEMPERATURE (DEGREES F) MAX.....57 NORMAL.....48 MIN.....35 NORMAL.....31 MEAN....46 NORMAL.....39 DEPARTURE FROM 30-YEAR NORMAL...........+7 TOTAL DEPARTURE FOR THE MONTH..........+23 [+0.7 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............19 DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH...........744 DEPARTURE.......-27 TOTAL HEATING UNITS FOR THE SEASON.........4992 DEPARTURE......-349 TOTAL HEATING UNITS LAST SEASON TO DATE....4895 DIFFERENCE......+97 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............46 S AT 1:54 A.M. AEROVANE.............47 S AT 1:54 A.M. ASOS.................45 SSW AT 1:54 A.M. DAVIS................45 SSW AT 9:29 A.M. FASTEST MILE FOR YESTERDAY..............33 S AT 1:55 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........32 S AT 1:55 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........31 SSW AT 7:11 A.M. AVERAGE WIND SPEED AND DIRECTION........20.5 S ASOS.................20.4 DAVIS................19.7 SW [229 deg] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...TRACE DEPARTURE......-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........5.14 DEPARTURE......+1.11 ASOS..............5.10 TOTAL PRECIPITATION FOR THE YEAR..........17.18 DEPARTURE......+4.31 ASOS.............19.41 # # Includes erroneous ASOS precipitation data on 2/13/08. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.3 TOTAL SNOWFALL FOR THE MONTH................6.3 DEPARTURE.....-4.1 TOTAL SNOWFALL FOR THE SEASON..............66.4 DEPARTURE....+10.6 PRELIMINARY CLIMATE SUMMARY FOR MARCH 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available, records not finalized 3/1 37/20/29/-3/0.34/3.2/034/05 38 W Aero 40 MPH W 3/2 37/23/30/-2/0/0/564/83 40 WNW 3/3 46/24/35/+3/0/0/327/48 42 S Aero 43 MPH S 3/4 58/36/47/+14/0.41/0/089/13 42 S Aero 43 MPH S 3/5 57/33/45/+12/0.31/0/199/29 45 S 3/6 46/27/37/+4/0/0/573/83 27 WSW 3/7 44/31/38/+5/0.28/0/395/57 29 NE 3/8 61/35/48/+14/2.20/0/000/00 69 SSW Aero 70 MPH S 3/9 47/24/36/+2/0/0/698/100 65 W Aero 65 MPH W 3/10 38/19/29/-5/0/0/687/98 31 W 3/11 42/19/31/-4/0/0/690/98 31 S 3/12 40/30/35/0/0.26/0.6/120/17 41 WNW 3/13 43/25/34/-1/T/T/490/69 31 W 3/14 53/30/42/+6/0.01/0/135/19 24 ENE 3/15 37/32/35/-1/0.51/1.9/000/00 39 NNE 3/16 40/31/36/0/T/T/014/02 42 WNW Aero 42 MPH WNW 3/17 41/25/33/-4/0/0/692/96 42 WNW Aero 39 MPH WNW 3/18 43/24/34/-3/0.02/0.1/493/68 22 NNE 3/19 43/30/37/0/0.53/0.5/000/00 28 ESE 3/20 50/32/41/+3/0.27/0/007/01 51 W 3/21 38/26/32/-6/0/0/704/96 61 W Aero 58 MPH W 3/22 45/25/35/-3/0/0/692/94 44 W Aero 44 MPH W 3/23 43/24/34/-4/0/0/717/97 25 WNW 3/24 46/24/35/-4/0/0/659/89 21 WNW 3/25 39/25/32/-7/0/0/618/83 35 S 3/26 57/35/46/+7/T/T/.../.. 46 S 3/27 morning low temp. 35F; normal low is now 31F NEW DAILY RECORDS FOR MARCH 2008 3/8 PEAK WIND GUST - 69 MPH SSW; PREVIOUSLY 68e MPH NE, 1941 3/8 NEW RECORD MAXIMUM DAILY RAINFALL of 2.20 inches; the previous record was 1.73 inches in 1933. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 27 HIGH 78 IN 1998 LOW 12 IN 1975 PRECIP 1.05 INS. IN 1913 SNOWFALL 6.6 INS. IN 1959 PEAK GUST 62 MPH NW IN 1965, SE IN 1992 RECORDS FOR MARCH 28 HIGH 86 IN 1998 LOW 7 IN 1923 PRECIP 2.31 INS. IN 1932 SNOWFALL 3.0 INS. IN 1932 PEAK GUST 60e MPH NW IN 1944, 60 WSW IN 1991 TODAY'S REPORT PREPARED By: Stephanie Radner