BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, MARCH 15, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast Temperature: 46F, Dew point: 44F, Wind: S at 11 kts Sea-level pressure: 29.85 inches Hg, rising Visibility: 3 miles, fog 6-hour min. temp. 45 deg. 6-hour precipitation: trace BHO SA 1155 55 SCT E80 OVC 3F 108/46/44/1811/985/ BINOVC E-SE THN F RB10E35/ 8/52/ 53004 MANUAL 6000/ ASOS 60001 ASOS 70001 10046 20045 10 A.M. Weather: Overcast Temperature: 50F, Dew point: 47F, Wind: S at 09 kts Sea-level pressure: 29.83 inches Hg, falling Visibility: 3 miles, fog 3-hourly precipitation: 0.01 inches BHO SA 1455 E95 BKN 140 OVC 3F 100/50/47/1709/983/ BRKS OVHD THN F RE20 PCPN VRY LGT/ 8/07/ 58008 MANUAL 6001/ ASOS 60001 1 P.M. Weather: Overcast Temperature: 52F, Dew point: 49F, Wind: WNW at 12 kts Sea-level pressure: 29.90 inches Hg, rising Visibility: 18 miles BHO SA 1755 E15 OVC 18 124/52/49/2912/990/ BINOVC N-NE AND SW-NW WND GRDLY VEERING RE10B30E50 PCPN VRY LGT/ 8/7// 53024 MANUAL 6001/ ASOS 60001 10054 20046 WEATHER SUMMARY FOR WEDNESDAY, MARCH 14 TEMPERATURE (DEGREES F) MAX.....66 NORMAL.....44 MIN.....42 NORMAL.....27 MEAN....54 NORMAL.....36 DEPARTURE FROM 30-YEAR NORMAL.........+18 TOTAL DEPARTURE FOR THE MONTH.........-15 (-0.9 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........11 DEPARTURE.......-18 TOTAL HEATING UNITS FOR THE MONTH.........454 DEPARTURE.......+13 TOTAL HEATING UNITS FOR THE SEASON.......4545 DEPARTURE......-466 TOTAL HEATING UNITS LAST SEASON TO DATE..4497 DIFFERENCE......+48 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 S AT 1:49 P.M. * AEROVANE.............36 S AT 1:49 P.M. ASOS.................36 S AT 1:49 P.M. DAVIS................37 SSE AT 12:39 P.M. FASTEST MILE FOR YESTERDAY..............28 S AT 4:39 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........28 S AT 4:41 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........26 S AT 1:20 P.M. AVERAGE WIND SPEED AND DIRECTION........18.7 S ASOS................18.6 DAVIS............. 15.8 S [170 deg] * last of several occurrences.. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace DEPARTURE.....-0.16 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........2.00 DEPARTURE.....-0.26 ASOS..............2.02 TOTAL PRECIPITATION FOR THE YEAR...........7.72 DEPARTURE.....-3.38 ASOS..............7.65 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......-5.8 TOTAL SNOWFALL FOR THE SEASON..............14.3 DEPARTURE.....-37.3 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 morning low temp. 45 deg; normal now 27 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 15 HIGH 80 IN 1990 LOW 6 IN 1993 PRE 1.33 INS. IN 1972 SNOW 12.0 INS. 1967 WIND 73e MPH ESE IN 1940 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 TODAY'S REPORT By: Stephanie Radner