BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MARCH 12, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Thin broken cirrostratus, few stratocumulus Temperature: 29F, Dew point: 9F, Wind: WNW at 7 kts Sea-level pressure: 30.29 inches Hg, rising Visibility: 60 miles 6-hour minimum temperature: 27F 24-hour precip: 0.03 in. Snow depth on ground: 0 BHO SA 1155 200 –BKN 60 257/29/9/3007/029/ FEW SC NW-N-E/ 8/501 51044 MANUAL 70003 ASOS 70008 10036 20027 10 A.M. Weather: Thin broken cirrostratus, broken cirrus Temperature: 33F, Dew point: 11F, Wind: W at 11 kts Sea-level pressure: 30.35 inches Hg, rising Visibility: 70 miles BHO SA 1455 200 –BKN E250 BKN 70 276/33/11/2711/035/ FEW CU NW-N/ 8/106 51019 1 P.M. Weather: Thin broken cirrus Temperature: 36F, Dew point: 10F, Wind: WNW at 12G23 kts, Wind: Peak wind gust 26 kts W at 12:31 P.M. Wind: direction variability SSE to W Sea-level pressure: 30.28 inches Hg, falling Visibility: 75 miles 6-hour maximum temperature: 37F BHO SA 1755 250 –BKN 75 253/36/10/2912G23/028/ FEW CU NW-N-E PK WND 2626/31 WND 16V27/ 8/101 58004 10037 20028 WEATHER SUMMARY FOR WEDNESDAY, MARCH 11, 2009 TEMPERATURE (DEGREES F) MAX.....50 NORMAL.....43 MIN.....33 NORMAL.....26 MEAN....42 NORMAL.....35 DEPARTURE FROM 30-YEAR NORMAL..................+7 TOTAL DEPARTURE FOR THE MONTH..................-5 [-0.7 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............23 DEPARTURE.........-7 TOTAL HEATING UNITS FOR THE MONTH............355 DEPARTURE.........+3 TOTAL HEATING UNITS FOR THE SEASON..........4882 DEPARTURE........-40 TOTAL HEATING UNITS LAST SEASON TO DATE.....4558 DIFFERENCE......+324 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............51 W AT 10:34 P.M. * AEROVANE.............52 W AT 10:35 P.M. ASOS.................49 W AT 10:37 P.M. DAVIS................47 W AT 10:32 P.M. FASTEST MILE FOR YESTERDAY..............42 W AT 10:33 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........38 W AT 10:34 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........37 W AT 10:34 P.M. AVERAGE............ 20.0 SSE ASOS................19.5 DAVIS...............18.8 S [172 DEGREES] * last of several occurrences.. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.03 DEPARTURE.........-0.12 ASOS...............0.08 TOTAL PRECIPITATION FOR THE MONTH...........2.41 DEPARTURE.........+0.76 ASOS...............2.34 TOTAL PRECIPITATION FOR THE YEAR............8.94 DEPARTURE.........-1.55 ASOS...............9.96 # # 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.........-0.4 TOTAL SNOWFALL FOR THE MONTH...............13.4 DEPARTURE.........+8.4 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+28.3 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/.../.. 43 S AERO 41 MPH S 3/7 60/42/51/+18/0.06/0/.../.. 37 S 3/8 57/42/50/+16/0/0/.../.. 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/.../.. 23 SSE 3/11 50/33/42/+7/0.13/0/000/00 51 W 3/12 morning low temp: 27F; our normal low is now 27F 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 12 HIGH 67 IN 1977 LOW 2 IN 1885 PRECIP 2.87 INS. IN 1888 SNOWFALL 9.7 INS. IN 1959 PEAK GUST 66 MPH SE IN 1962 RECORDS FOR MARCH 13 HIGH 72 IN 1990 LOW -1 IN 1885 PRECIP 2.47 INS. IN 1993 SNOWFALL 10.0 INS. IN 1993 PEAK GUST 76 MPH ENE IN 1993 [THE "STORM OF THE CENTURY"] TODAY'S REPORT PREPARED BY: Stephanie Radner