BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, FEBRUARY 17, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Scattered altocumulus and cirrus Temperature: 18F, Dew point: 5F, Wind: WSW at 15G23 kts Sea-level pressure: 29.72 inches Hg, rising Visibility: 50 miles Snow on ground: 1 inch 6-hourly min. temp. 17 deg. BHO SA 1155 130 SCT 250 –SCT 50 063/18/5/2415G23/972/ FEW ACSL NW/ 8/071 4/001 53017 10020 20017 10 A.M. Weather: Scattered altocumulus and cirrus Temperature: 24F, Dew point: 6F, Wind: WSW at 14 kts Peak wind: WSW at 27 kts at 8 mins. past the hour Sea-level pressure: 29.74 inches Hg, rising Visibility: 55 miles BHO SA 1455 140 SCT 250 –SCT 55 070/24/6/2414/974/ PK WND 2427/08/ 8/071 51007 1 P.M. Weather: Scattered cumulus, broken cirrus Temperature: 26F, Dew point: 6F, Wind: W at 23G39 kts Sea-level pressure: 29.52, falling Visibility: 70 miles 6-hourly max. temp. 31 deg. BHO SA 1755 250 –SCT 70 056/31/7/2315/970/ FEW AC NW-N/ 8/071 58014 10031 20017 WEATHER SUMMARY FOR FRIDAY, FEBRUARY 16 TEMPERATURE (DEGREES F) MAX.....27 NORMAL.....36 MIN......9 NORMAL.....20 MEAN....18 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL.........-10 TOTAL DEPARTURE FOR THE MONTH........-103 (-6.6 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........47 DEPARTURE.......+10 TOTAL HEATING UNITS FOR THE MONTH.........710 DEPARTURE......+100 TOTAL HEATING UNITS FOR THE SEASON.......3654 DEPARTURE......-492 TOTAL HEATING UNITS LAST SEASON TO DATE..3607 DIFFERENCE......+47 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............51 W AT 8:04 P.M.* AEROVANE.............49 W AT 10:55 A.M. ASOS.................46 W AT 8:05 P.M. DAVIS................49 W AT 7:18 P.M. FASTEST MILE FOR YESTERDAY..............35 W AT 2:51 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........35 WSW AT 10:55 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........36 W AT 8:03 P.M. AVERAGE WIND SPEED AND DIRECTION......24.6 W ASOS..............23.2 DAVIS.............24.4 WSW [250 deg] * last of several occurrences.. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.34 DEPARTURE.....+0.03 ASOS..............2.35 TOTAL PRECIPITATION FOR THE YEAR...........5.28 DEPARTURE.....-1.81 ASOS..............5.22 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE......-0.5 TOTAL SNOWFALL FOR THE MONTH................2.3 DEPARTURE......-7.7 [CORRECTED] TOTAL SNOWFALL FOR THE SEASON...............8.9 DEPARTURE.....-30.5 [CORRECTED] PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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 2/1 35/20/28/+2/0/0/126/21 37 S Aero 34 MPH S 2/2 35/28/32/+6/0.18/0.3/000/00 20 NW 2/3 32/19/26/0/0.05/0.4/574/95 39 W Aero 47 MPH W 2/4 22/10/16/-10/0/0/601/99 39 WSW Aero 40 MPH WSW 2/5 16/5/11/-16/0/0/493/81 61 W Aero 60 MPH W 2/6 24/10/17/-10/0/0/593/97 38 W Aero 36 MPH W 2/7 21/8/15/-12/0/0/474/77 43 W Aero 41 MPH W 2/8 25/11/18/-9/0/0/370/60 48 WSW 2/9 26/15/21/-6/0/0/600/97 44 WSW Aero 42 MPH WSW 2/10 32/13/23/-4/0/0/199/32 28 W 2/11 31/14/23/-4/0/0/456/73 27 SSW 2/12 36/20/28/0/0/0/602/96 43 WSW Aero 40 MPH W 2/13 22/6/14/-14/0.02/0.2/226/36 28 NW 2/14 36/13/25/-3/2.09/1.4/000/00 47 NE Aero 52 MPH NE 2/15 21/9/15/-13/0/0/616/97 46 W Aero 53 MPH W 2/16 27/9/18/-10/0/0/.../.. 51 W Aero 49 MPH W 2/17 morning low temp. 17 deg; normal low now 21 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 17 HIGH 61F IN 1981 LOW -16F IN 1896 PRECIP 1.86 INCHES IN 2003 SNOWFALL 20.0 INCHES IN 2003 PEAK GUST 72 MPH NW IN 1968 RECORDS FOR FEBRUARY 18 HIGH 65F IN 1981 LOW -10F IN 1958 PRECIP 1.97 INCHES IN 1887 SNOWFALL 9.2 INCHES IN 1952 PEAK GUST 65e MPH NNW IN 1952 TODAY'S REPORT By: Mike Iacono If you do not wish to receive this Daily Discussion and Climate Summary from the Blue Hill Observatory, please send an email to sitemaster@bluehill.org.