BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, FEBRUARY 14, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME SEASONABLE WEATHER FOR FEBRUARY TODAY...PARTIAL HALO VISIBLE AT MID-MORNING AS HIGH CLOUDS ADVANCE... The low temperature of 20 matches the normal low for this date, and the high temperature is rising just above the average to the upper 30s by early afternoon. A brisk wind has kept a chill in the air all day, with the wind chill in the single digits early this morning. A completely clear sky at sunrise began to fill with cirrus by mid-morning, and a partial 22-degree halo (about three-fourths complete with the section closest to the horizon missing due to lower clouds) surrounded the sun for a time around 10 A.M. February continues warm averaging about three degrees above normal over the first two weeks. Today's observations: 7 A.M. Weather: Clear, no clouds Temperature: 22F, Dew point: 10F, Wind: W at 17G24 kts, Sea-level pressure: 29.83 inches Hg, falling Visibility: 75 miles 6-hour minimum temperature: 20F Snow depth on ground: Trace BHO SA 1155 CLR 75 100/22/10/2717G24/983/ 56007 10024 20020 10 A.M. Weather: Scattered dense cirrus, thin broken cirrus, partial 22-degree halo Temperature: 31F, Dew point: 9F, Wind: W at 13G28 kts, Wind: Peak gust past hour 28 kts W at 9:52 A.M. Sea-level pressure: 29.79 inches Hg, falling Visibility: 75 miles BHO SA 1455 200 SCT 250 –BKN 75 088/31/9/2713G28/979/ PK WND 2728/52 PARTIAL HALO/ 8/001 58012 1 P.M. Weather: Thin broken cirrus, few lower dense cirrus Temperature: 36F, Dew point: 8F, Wind: W at 20G32 kts, Wind: Peak gust past hour 32 kts W at 12:55 P.M. Wind: Variable direction WSW to NW Sea-level pressure: 29.75 inches Hg, falling Visibility: 75 miles 6-hour maximum temperature: 37F BHO SA 1755 250 –BKN 75 074/36/8/2820G32/975/ FEW LWR DNS CI PK WND 2832/55 WND 25V31/ 8/001 56014 10037 20022 WEATHER SUMMARY FOR FRIDAY, FEBRUARY 13 TEMPERATURE (DEGREES F) MAX.....38 NORMAL.....36 MIN.....24 NORMAL.....20 MEAN....31 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL.................+3 TOTAL DEPARTURE FOR THE MONTH................+41 [+3.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............34 DEPARTURE.........-3 TOTAL HEATING UNITS FOR THE MONTH............455 DEPARTURE........-44 TOTAL HEATING UNITS FOR THE SEASON..........4023 DEPARTURE........-12 TOTAL HEATING UNITS LAST SEASON TO DATE.....3665 DIFFERENCE......+358 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............47 W AT 5:12 A.M. AEROVANE.............47 W AT 5:12 A.M. ASOS.................47 WNW AT 5:12 A.M. DAVIS................43 W AT 5:11 A.M. FASTEST MILE FOR YESTERDAY..............33 W AT 5:12 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........31 NW AT 5:15 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........32 W AT 5:15 A.M. AVERAGE..............19.5 W ASOS.................17.1 DAVIS................18.5 WNW [282 DEGREES] 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...........0.62 DEPARTURE.........-1.27 ASOS...............0.62 TOTAL PRECIPITATION FOR THE YEAR............4.78 DEPARTURE.........-1.89 ASOS...............5.82 # # Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.6 TOTAL SNOWFALL FOR THE MONTH................6.5 DEPARTURE.........-1.8 TOTAL SNOWFALL FOR THE SEASON..............61.6 DEPARTURE........+23.9 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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 2/1 45/15/30/+4/0/0/402/67 35 SW 2/2 50/32/41/+15/0/0/568/94 29 NNW 2/3 33/22/28/+2/0.44/5.6/000/00 39 N AERO 38 MPH N 2/4 24/10/17/-9/0.05/0.9/572/94 37 WNW 2/5 17/3/10/-17/0/0/538/88 33 W 2/6 26/4/15/-12/0/0/509/83 26 W 2/7 42/16/29/+2/0/0/314/51 45 S AERO 44 MPH S 2/8 49/30/40/+13/0/0/433/70 54 W AERO 54 MPH W 2/9 37/21/29/+2/0/0/621/100 38 WNW AERO 38 MPH WNW 2/10 36/22/29/+2/0/0/.../.. 21 SSE 2/11 59/34/47/+20/0/0/.../.. 29 SSE AERO 24 MPH SSE 2/12 51/37/44/+16/0.13/0/.../.. 54 WSW 2/13 38/24/31/+3/0/.../.. 47 W AERO 47 MPH W 2/14 morning low temp: 20F; our normal low is now 20F NEW DAILY RECORDS FOR FEBRUARY 2009... None to date DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 14 HIGH 56F IN 1949 LOW -8F IN 1979 PRECIP 2.09 INCHES IN 2007 SNOWFALL 11.0 INCHES IN 1914 PEAK GUST 83 MPH SSW IN 2000 RECORDS FOR FEBRUARY 15 HIGH 60F IN 1954 LOW -18F IN 1943 PRECIP 1.28 INCHES IN 1950 SNOWFALL 11.2 INCHES IN 1940 PEAK GUST 94e MPH WNW IN 1946 TODAY'S REPORT PREPARED By: Mike Iacono