BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MARCH 26, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Thin broken cirrus Temperature: 36F, Dew point: 20F, Wind: S at 4 kts Sea-level pressure: 30.15 inches Hg, falling Visibility: 45 miles 6-hour minimum temperature: 33F 24-hour precipitation: 0 inches BHO SA 1155 250 –BKN 45 209/36/20/1704/015/ THN K LYR N INVSN PRSNT/ 8/001 55004 10036 20033 10 A.M. Weather: Scattered altocumulus, thin overcast cirrus, few lenticulars SW-N, break in overcast N-E Temperature: 50F, Dew point: 21F, Wind: SW at 9 kts, Wind: direction variable SSE-W Sea-level pressure: 30.15 inches Hg, rising Visibility: 30 miles, hazy BHO SA 1455 150 SCT 250 –OVC 30 211/50/21/2209/015/ ACSL SW-N BINOVC N-E HAZY WND 16V26/ 8/041 53022 1 P.M. Weather: Overcast stratocumulus, break in overcast NE-E Temperature: 53F, Dew point: 22F, Wind: S at 7 kts Sea-level pressure: 30.07 inches Hg, falling Visibility: 40 miles, light haze 6-hour maximum temperature: 53F BHO SA 1755 E45 OVC 40 183/53/22/1707/007/ BINOVC NE-E LGT HZ/ 8/5// 58028 10053 20036 WEATHER SUMMARY FOR WEDNESDAY, MARCH 25, 2009 TEMPERATURE (DEGREES F) MAX.....49 NORMAL.....48 MIN.....29 NORMAL.....30 MEAN....39 NORMAL.....39 DEPARTURE FROM 30-YEAR NORMAL...................0 TOTAL DEPARTURE FOR THE MONTH.................-21 [-1.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............26 DEPARTURE..........0 TOTAL HEATING UNITS FOR THE MONTH............762 DEPARTURE........+17 TOTAL HEATING UNITS FOR THE SEASON..........5289 DEPARTURE........-26 TOTAL HEATING UNITS LAST SEASON TO DATE.....4973 DIFFERENCE......+316 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............25 N AT 9:06 A.M. AEROVANE.............23 N AT 9:06 A.M. ASOS.................25 NNE AT 9:08 A.M. DAVIS................28 N AT 9:04 A.M. FASTEST MILE FOR YESTERDAY............. 17 SSE AT 8:58 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........17 SSE AT 8:58 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........19 N AT 9:08 A.M. AVERAGE............10.8 NNW ASOS...............11.2 DAVIS..............10.3 NNE [017 DEGREES] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.........-0.16 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........2.45 DEPARTURE.........-1.42 ASOS...............2.39 TOTAL PRECIPITATION FOR THE YEAR............8.98 DEPARTURE.........-3.73 ASOS..............10.01 # # 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.........+3.3 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+23.2 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/.../.. 25 N AERO 23 MPH N 3/26 morning low temp. 33F; 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 26 HIGH 76 IN 1922, 1949 LOW 6 IN 1960 PRECIP 1.99 INS. IN 1988 SNOWFALL 5.4 INS. IN 2001 PEAK GUST 63 MPH S IN 1970 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 TODAY'S REPORT PREPARED BY: Stephanie Radner