BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, MARCH 27, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Obscurement with fog Temperature: 37F, Dew point: 37F, Wind: NW at 11 kts Sea-level pressure: 29.91 inches Hg, rising Visibility: 1/16 mile, fog 6-hour minimum temperature: 36F 6-hour precipitation: 0.02 inches 24-hour precipitation: 0.35 inches BHO SA 1155 W1 X 1/16F 127/37/37/3111/991/ 8//// 51021 MANUAL 6002/ ASOS 60003 MANUAL 70035 ASOS 70033 10037 20036 10 A.M. Weather: Overcast stratus, few lower stratus occasionally drifting over summit Temperature: 42F, Dew point: 40F, Wind: NNW at 10 kts, Wind: direction variable W-N Sea-level pressure: 29.97 inches Hg, rising Visibility: 10 miles, thin fog BHO SA 1455 E9 OVC 10 149/42/40/3310/997/ FEW LWR STRA OCNL DRFTG OVR SMT WND 27V36 THN F/ 8/6// 53022 1 P.M. Weather: Scattered stratocumulus, thin broken cirrus Temperature: 50F, Dew point: 41F, Wind: N at 3 kts (estimated) Wind: Light and variable Sea-level pressure: 29.97 inches Hg, falling Visibility: 35 miles 6-hour maximum temperature: 53F BHO SA 1755 25 SCT 250 -BKN 35 148/50/41/E3503/997/ WND L/V/ 8/501 58001 10053 20037 WEATHER SUMMARY FOR THURSDAY, MARCH 26, 2009 TEMPERATURE (DEGREES F) MAX.....53 NORMAL.....48 MIN.....33 NORMAL.....31 MEAN....43 NORMAL.....39 DEPARTURE FROM 30-YEAR NORMAL..................+4 TOTAL DEPARTURE FOR THE MONTH.................-17 [-0.9 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............22 DEPARTURE.........-4 TOTAL HEATING UNITS FOR THE MONTH............784 DEPARTURE........+13 TOTAL HEATING UNITS FOR THE SEASON..........5311 DEPARTURE........-30 TOTAL HEATING UNITS LAST SEASON TO DATE.....4992 DIFFERENCE......+319 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............23 SE AT 9:38 P.M. * AEROVANE.............19 ESE AT 11:22 P.M. * ASOS.................21 S AT 10:22 P.M. DAVIS................21 AT 11:20 P.M. FASTEST MILE FOR YESTERDAY............. 16 ESE AT 11:16 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........17 S AT 3:07 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........17 SE AT 9:29 P.M. AVERAGE............10.3 SSE ASOS................9.1 DAVIS..............10.2 S [180 DEGREES] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.35 DEPARTURE.........+0.19 ASOS...............0.33 TOTAL PRECIPITATION FOR THE MONTH...........2.80 DEPARTURE.........-1.23 ASOS...............2.72 TOTAL PRECIPITATION FOR THE YEAR............9.33 DEPARTURE.........-3.54 ASOS..............10.34 # # Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.3 TOTAL SNOWFALL FOR THE MONTH...............13.4 DEPARTURE.........+3.0 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+22.9 PRELIMINARY CLIMATE SUMMARY FOR MARCH 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 3/1 28/21/25/-7/0.26/1.9/000/00 38 NNE 3/2 22/15/19/-13/1.21/8.2/000/00 40 NNE AERO 37 MPH NNE 3/3 25/11/18/-14/0.01/0.1/640/94 33 NW 3/4 30/6/18/-14/0/0/684/100 31 WNW 3/5 39/16/28/-5/0/0/659/96 25 WSW 3/6 49/30/40/+7/T/0/152/22 43 S AERO 41 MPH S 3/7 60/42/51/+18/0.06/0/429/62 37 S 3/8 57/42/50/+16/0/0/445/64 39 WNW AERO 40 MPH WNW 3/9 42/28/35/+1/0.72/3.2/000/00 33 N 3/10 42/26/34/0/0.02/0/470/67 23 SSE 3/11 50/33/42/+7/0.13/0/000/00 51 W 3/12 39/25/32/-3/0/0/685/97 44 W AERO 45 MPH W 3/13 37/19/28/-7/0/0/660/93 26 SSE 3/14 50/25/38/+2/0/0/613/86 24 SSW 3/15 59/34/47/+11/0/0/686/96 17 SSW 3/16 42/29/36/0/0/0/000/00 30 NE 3/17 47/28/38/0/+1/671/93 21 SSW 3/18 59/31/45/+8/0/0/448/62 37 SSW AERO 40 MPH S 3/19 45/36/41/+4/0.04/0/000/00 22 S 3/20 36/25/31/-7/0/0/650/89 26 NNE 3/21 43/23/33/-5/0/0/704/96 21 S 3/22 50/27/39/+1/0/0/206/28 29 NW AERO 31 MPH WNW 3/23 32/18/25/-13/0/0/694/94 38 NW 3/24 44/18/31/-8/0/0/630/85 33 NW AERO 37 MPH NW 3/25 49/29/39/0/0/0/670/90 25 N AERO 23 MPH N 3/26 53/33/43/+4/0.25/0/298/40 23 SE AERO 19 MPH ESE 3/27 morning low temp. 36F; normal low is now 31F NEW DAILY RECORDS FOR MARCH 2009... 3/2: DAILY SNOWFALL 8.2 INS. SURPASSES PREVIOUS RECORD OF 7.1 INS. IN 1948 3/7: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE PREVIOUSLY SET IN 1974 AND 1987 3/8: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE PREVIOUSLY SET IN 1995 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