BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, MARCH 16, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME BIGGEST SNOWSTORM OF THE SEASON IN PROGRESS TODAY... Light snow began at 7:50 AM EST this morning, and it became moderate snow during mid-day. The first inch of snowfall was measured by 2 PM EST. The snow has become heavy by late afternoon and a total of 3.2 inches of snow has been measured through 4 PM EST. There is considerable blowing and drifting snow at this time with winds on the summit gusting over 40 mph, NNE with several peak gusts to 46 mph. Today's observations: 7 A.M. Weather: Overcast Temperature: 27F, Dew point: 15F, Wind: NNE at 15G28 kts Peak wind: 32 kts NNE at 6:33 A.M. Sea-level pressure: 30.36 inches Hg, rising Visibility: 15 miles 6-hour min. temp. 27 deg. 24-hour precipitation: 0.07 inches BHO SA 1155 E55 OVC 15 280/27/15/0315G28/036/ FEW LWR STFRA VIRGA E-SE PK WND 0332/33 WND 33V07/ 8/5// 51018 MANUAL 70007 ASOS 70008 10035 20027 10 A.M. Weather: Overcast, light snow, blowing snow Temperature: 26F, Dew point: 20F, Wind: NNE at 21G32 kts Peak wind: 36 kts NNE at 9:00 A.M. Sea-level pressure: 30.34 inches Hg, falling Visibility: 1 mile, snow 3-hourly precipitation: 0.01 inches BHO SA 1455 E25 OVC 1SF 273/26/20/0321G32/034/ PK WND 0336/00 WND 35V08/ 8/7// 58007 MANUAL 6001 1 P.M. Weather: Overcast, moderate snow, fog and blowing snow Temperature: 24F, Dew point: 22F, Wind: NNE at 18G33 kts Wind: Peak wind 33 kts NNE at 12:44 P.M. Sea-level pressure: 30.28 inches Hg, falling Visibility: 1/2 mile, snow/fog 6-hourly precipitation: 0.13 inches BHO SA 1755 E9 OVC 1/2SF 253/24/22/0318G33/028/ PK WND 0233/44 WND 34V09/ 8/7// 57020 MANUAL 6013/ ASOS 60011 10027 20024 4 P.M. Weather: Overcast, heavy snow, blowing snow and fog Temperature: 26F, Dew point: 24F, Wind: NNE at 21G40 kts Wind: Peak wind 40 kts NNE at 3:49 P.M. Sea-level pressure: 30.19 inches Hg, falling Visibility: 1/4 mile, heavy snow/fog Total snowfall since 7 AM: 3.2 inches BHO SA 2055 E8 OVC 1/4S+BSF 223/26/26/24/0321G40/019/ PK WND 0340/49 TOTAL NEW SNOW PST 9 HRS 3.2 INS/ 8/72/ 56030 WEATHER SUMMARY FOR THURSDAY, MARCH 15 TEMPERATURE (DEGREES F) MAX.....54 NORMAL.....44 MIN.....35 NORMAL.....27 MEAN....45 NORMAL.....36 DEPARTURE FROM 30-YEAR NORMAL.........+ 9 TOTAL DEPARTURE FOR THE MONTH.........- 6 (-0.2 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........20 DEPARTURE.......- 9 TOTAL HEATING UNITS FOR THE MONTH.........474 DEPARTURE.......+ 4 TOTAL HEATING UNITS FOR THE SEASON.......4565 DEPARTURE......-475 TOTAL HEATING UNITS LAST SEASON TO DATE..4527 DIFFERENCE......+38 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 NW AT 4:43 P.M. AEROVANE.............36 NW AT 4:44 P.M. ASOS.................33 NW AT 4:46 P.M. DAVIS................35 WNW AT 4:43 P.M. FASTEST MILE FOR YESTERDAY..............26 NW AT 4:43 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........26 NW AT 4:46 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 NW AT 4:45 P.M. AVERAGE WIND SPEED AND DIRECTION........13.8 S ASOS................14.5 DAVIS...............13.2 WSW [247 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07 DEPARTURE.....-0.09 ASOS..............0.08 TOTAL PRECIPITATION FOR THE MONTH..........2.07 DEPARTURE.....-0.35 ASOS..............2.10 TOTAL PRECIPITATION FOR THE YEAR...........7.79 DEPARTURE.....-3.47 ASOS..............7.73 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.4 TOTAL SNOWFALL FOR THE MONTH................0.4 DEPARTURE......-6.2 TOTAL SNOWFALL FOR THE SEASON..............14.3 DEPARTURE.....-37.7 PRELIMINARY CLIMATE SUMMARY FOR MARCH 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 3/1 40/22/31/-1/0/0/512/76 24 NW Aero 23 MPH NW 3/2 49/28/39/+7/1.74/0.4/000/00 48 E Aero 45 MPH E 3/3 58/33/46/+14/0/0/489/72 44 WNW Aero 43 MPH WNW 3/4 40/26/33/0/0/0/471/69 37 W 3/5 37/19/28/-5/T/T/198/29 58 W Aero 57 MPH W 3/6 19/3/11/-22/0/0/667/97 * 57 W Aero 61 MPH W 3/7 22/2/12/-21/0/0/504/73 28 SW 3/8 25/5/15/-19/T/T/471/68 51 WNW Aero 54 MPH WNW 3/9 34/1/18/-16/0/0/668/96 * 25 S 3/10 49/22/36/+2/0/0/322/46 39 S Aero 39 MPH S 3/11 51/33/42/+7/0.26/0/513/73 32 W 3/12 55/31/43/+8/0/0/423/60 24 SSW 3/13 60/36/48/+13/0/0/319/45 35 S Aero 33 MPH S 3/14 66/42/54/+18/0/0/405/57 36 S 3/15 54/35/45/+9/0.07/0/000/00 36 NW 3/16 morning low temp. 27 deg; normal now 28 deg. * Record low maximum temperature of 19 on the 6th surpasses previous 21 set in 1916. * Record low minimum temperature of 3 on the 6th ties previous 3 set in 1948. * Record low minimum temperature of 1 on the 9th breaks previous 5 set in 1885, 1943, and 1996. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 16 HIGH 73 IN 1990 LOW 8 IN 1932 PRE 1.95 INS. IN 1900 SNOW 10.0 INS. IN 1896 WIND 79 MPH NE IN 1956 RECORDS FOR MARCH 17 HIGH 69 IN 2003 LOW 6 IN 1885 PRECIP 1.97 INS. IN 1968 SNOWFALL 6.5 INS. IN 1956 PEAK GUST 70 MPH SSW IN 1973 TODAY'S REPORT By: Stephanie Radner/Mike Iacono