BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JANUARY 20, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME ARCTIC AIR MOVING IN ON STRONG WINDS TODAY... The high temperature for the day of 30 occurred back at midnight, and the day time high has been 29 through early afternoon. As of 2 PM, the temperature has dropped back to the lower 20s and the dew point has dropped to the low single digits. The winds have been increasing all day, and the peak gust so far has been 51 MPH WNW at 2:02 PM. Today's observations: 7 A.M. Weather: Scattered stratocumulus and scattered altocumulus Temperature: 26F, Dew point: 18F, Wind: WSW at 16G23 kt Sea-level pressure: 29.66 inches Hg, rising Visibility: 45 miles BHO SA 1155 E40 SCT 100 SCT 45 043/26/18/2516G23/966/ 8/570 53014 70001 10029 20025 10 A.M. Weather: Scattered stratocumulus Temperature: 28F, Dew point: 13F, Wind: W at 20G32 kt Sea-level pressure: 29.68 inches Hg, rising Visibility: 50 miles BHO SA 1455 E40 BKN 50 050/28/13/2720G32/968/ SW-E47 SW NW MVNG ESE VIRGA WNW-N AND E-SE VSBY NW 15 PK WND 2736/1439 WND 24V30/ 8/500 53007 6000/ 1 P.M. Weather: Scattered cumulus, snow flurry past hour Temperature: 25F, Dew point: 9F, Wind: W at 24G35 kt Sea-level pressure: 29.70 inches Hg, rising Visibility: 55 miles BHO SA 1755 E35 SCT 50 BKN 55 057/25/9/2824G35/970/ 8/500 53007 6000/ 10029 20026 WEATHER SUMMARY FOR FRIDAY, JANUARY 19 TEMPERATURE (DEGREES F) MAX.....38 NORMAL.....33 MIN.....30 NORMAL.....18 MEAN....34 NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL.........+9 TOTAL DEPARTURE FOR THE MONTH.......+205 (+10.6 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........31 DEPARTURE.......-8 TOTAL HEATING UNITS FOR THE MONTH.........532 DEPARTURE.....-203 TOTAL HEATING UNITS FOR THE SEASON.......2405 DEPARTURE.....-659 TOTAL HEATING UNITS LAST SEASON TO DATE..2739 DIFFERENCE....-334 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............40 W AT 8:19 P.M. * AEROVANE.............41 W AT 6:12 P.M. ASOS.................38 W AT 6:11 P.M. DAVIS................40 W AT 2:19 P.M. FASTEST MILE FOR YESTERDAY..............30 W AT 6:12 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........30 W AT 2:20 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........32 W AT 2:20 P.M. AVERAGE WIND SPEED AND DIRECTION......16.0 W ASOS..............14.7 DAVIS.............16.4 W [260 deg.] * last of several occurrences.. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.81 DEPARTURE......-0.13 ASOS..............2.74 TOTAL PRECIPITATION FOR THE YEAR...........2.81 DEPARTURE......-0.13 ASOS..............2.74 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.5 TOTAL SNOWFALL FOR THE MONTH................0.1 DEPARTURE.....-9.4 TOTAL SNOWFALL FOR THE SEASON...............3.8 DEPARTURE....-19.3 PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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 1/1 53/30/42/+15/0.98/0/000/00 38 SE 1/2 43/31/37/+10/0.03/0/505/92 44 W Aero 47 MPH W 1/3 49/30/40/+13/0/0/435/79 40 S 1/4 53/40/47/+20/0/0/198/36 31 SSW 1/5 61/46/54/+27/0.04/0/000/00 44 S Aero 44 MPH S 1/6 66/48/57/+31/0.03/0/161/29 48 SSW Aero 47 MPH SSW 1/7 50/38/44/+18/0/0/505/91 43 W Aero 44 MPH W 1/8 52/36/44/+18/0.69/0/000/00 45 W Aero 45 MPH W 1/9 41/29/35/+9/0/0/518/93 40 W Aero 39 MPH W 1/10 34/22/28/+2/0/0/525/94 48 W 1/11 33/17/25/-1/0/0/.../.. 36 S Aero 38 MPH S 1/12 48/32/40/+14/0/0/.../.. 38 SSW Aero 39 MPH SSW 1/13 48/36/42/+16/0.06/000/00 30 S 1/14 38/31/35/+9/0.16/0/000/00 21 NE 1/15 40/31/36/+10/0.58/0/000/00 25 NNE 1/16 38/15/27/+1/0.05/0/.../.. 40 W Aero 42 MPH W 1/17 18/7/13/-13/0.00/0/.../.. 38 WNW Aero 43 MPH WNW 1/18 36/10/23/-3/0.13/0.1/.../.. 33 SSE 1/19 38/30/34/+9/0.06/T/.../.. 40 W Aero 41 MPH W 1/20 morning low temp. 25 deg; normal now 18 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JANUARY 20 HIGH 59F IN 1951 LOW -9F IN 1901 PRECIP 1.95 INS. IN 1978 SNOWFALL 19.0 INS. IN 1978 [RECORD FOR MONTH] PEAK GUST 76e MPH NE IN 1978 RECORDS FOR JANUARY 21 HIGH 65F IN 1906 LOW -4F IN 1888,1893 PRECIP 2.49 INS. IN 1979 SNOWFALL 7.5 INS. IN 2001 PEAK GUST 78e MPH SE IN 1979 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.