BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, FEBRUARY 26, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME LOWEST BAROMETRIC PRESSURE SINCE 1995 AS POWERFUL LATE WINTER STORM BRINGS 3.66 INCHES OF RAINFALL AND A TRACE OF SNOW The lowest barometric pressure of 28.70 inches at 11:05 P.M. last evening, February 25, was our lowest since February, 1995. At that time the low- est pressure got down to 28.67 inches. The station pressure this time reached a low of 28.015 inches or 948.7 mbs. Peak wind gusts were recorded in a range from 55 MPH to 63 MPH mostly all from the east-northeast. Aerovane reached a peak of 55 MPH at 7:07 p.m., ASOS was 56 MPH and 420C system 55 MPH at 8:22 p.m. According to ASOS the fastest 2-minute wind was 39 MPH from the ENE at 6:55 p.m. The precipitation total was 3.66 inches in the standard gage from the time that measurable rain began at 9 to 10 p.m. on February 23 till it ended in the hour ending at midnight on February 25. ASOS has 3.75 inches for that same period. A dusting of snow fell (0.1 inch) during the early hours of today, February 26. Today's observations: 7 A.M. Weather: Broken stratocumulus, few moderate cuform tops Temperature: 32F, Dew point: 27F, Wind: E at 13G22 kts, Wind: Direction variable ENE to ESE Sea-level pressure: 29.25 inches Hg, rising Visibility: 25 miles, light haze 6-hour minimum temp: 31F 6-hour and 24 hour precip: 1.91 ins. 6-hour snowfall: 0.1 in. Average snow depth: Trace BHO SA 1155 E40 BKN 25 905/32/27/0913G22/925/ FEW LWR STRA/SC FEW MDT SC/MDT CUFRM TOPS LGT HZ WND 06V12/ TOTAL NEW SNW PST 24 HRS 0.1 IN/ 8/500 51050 ASOS 70196 MANUAL 70191 10035 20031 10 A.M. Weather: Broken stratocumulus, overcast stratocumulus, light snow shower, snow began at 50 past the hour Temperature: 37F, Dew point: 28F, Wind: E at 18G31 kts, Wind: Peak wind gust 31 kts from east at 9:45 a.m. Wind: Direction variable ENE to ESE Sea-level pressure: 29.31 inches Hg, rising Visibility: 15 miles, light snow shower 3-hour precip: trace 3-hour snowfall: trace BHO SA 1455 E23 BKN 40 OVC 15SW- 926/37/28/0918G31/931/ CIG RGD BINOVC PK WND 0931/45/ WND 06V12/ SB50 PCPN VRY LGT/ 8/5// MANUAL 6000/ 51021 1 P.M. Weather: Scattered stratus fractus, broken stratocumulus, overcast nimbostratus, sun occasionally dimly visible, light snow and ice pellet shower in progress Temperature: 34F, Dew point: 33F, Wind: ESE at 9 kts, Sea-level pressure: 29.35 inches Hg, rising Visibility: 8 miles 6-hour max. temp: 37F 6-hour precip: 0.05 inch 6-hour snowfall: trace BHO SA 1755 8 SCT E30 BKN 55 OVC 8SW-IPW- 938/34/33/1109/935/ SUN OCNL DMLY VSB VSBY N 12 NE 15 WNW 4 ESE 5 SIPBUKN TOTAL NEW SNW PST 6 HRS 0.3 IN/ 8/72/ 51012 ASOS 60004 MANUAL 6005/ 10037 20031 WEATHER SUMMARY FOR THURSDAY, FEBRUARY 25 TEMPERATURE (DEGREES F) MAX.....45 NORMAL.....39 MIN.....37 NORMAL.....22 MEAN....41 NORMAL.....31 DEPARTURE FROM 30-YEAR AVERAGE............+10 TOTAL DEPARTURE FOR THE MONTH.............+46 [+1.6 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............24 DEPARTURE.......-11 TOTAL HEATING UNITS FOR THE MONTH...........880 DEPARTURE.......-52 TOTAL HEATING UNITS FOR THE SEASON.........4468 DEPARTURE.....-162 TOTAL HEATING UNITS LAST SEASON TO DATE....4454 DIFFERENCE.....-148 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............55 ENE AT 8:22 P.M. AEROVANE..............55 ENE AT 8:22 P.M. ASOS..................56 ENE AT 8:22 P.M. DAVIS.................54 NE AT 10:20 P.M. THE FASTEST MILE FOR YESTERDAY...........40 ENE AT 6:55 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............39 ENE AT 6:55 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........39 NE AT 8:25 P.M. AVERAGE WIND SPEED AND DIRECTION.......16.8 NNE ASOS................16.7 DAVIS...............15.7 ENE [060 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 1.91 DEPARTURE....+1.76 ASOS..............1.96 TOTAL PRECIPITATION FOR THE MONTH..........4.82 DEPARTURE....+1.21 ASOS..............4.89 TOTAL PRECIPITATION FOR THE YEAR...........8.85 DEPARTURE....+0.46 ASOS..............8.89 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M........ 0.1 DEPARTURE.....-0.4 TOTAL SNOWFALL FOR THE MONTH...............10.8 DEPARTURE.....-3.3 TOTAL SNOWFALL FOR THE SEASON..............55.3 DEPARTURE....+10.9 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 2/1 32/18/25/-1/0/0/582/97 31 WSW 2/2 30/17/24/-2/0/0/343/57 22 WSW 2/3 31/22/27/+1/0.02/0.4/024/04 20 W 2/4 31/20/26/0/0/0/589/97 33 WNW AERO 35 MPH WNW 2/5 33/17/25/-2/0/0/427/70 24 W 2/6 23/14/19/-8/T/0.2/000/00 30 NNW 2/7 30/10/20/-7/0/0/615/100 36 WNW AERO 37 MPH WNW 2/8 32/17/25/-2/0/0/531/86 36 W 2/9 38/17/28/+1/0/0/552/89 31 WNW 2/10 33/26/30/+3/0.53/4.0/000/00 46 NNE 2/11 37/26/32/+5/T/T/531/85 35 NW AERO 38 MPH NNW 2/12 36/20/28/0/0/0/615/98 29 WNW 2/13 34/16/25/-3/0/0/265/42 31 W 2/14 38/21/30/+2/0/0/430/68 44 W AERO 43 MPH W 2/15 38/28/33/+5/0/0/133/21 36 WSW 2/16 32/27/30/+2/0.61/5.6/000/00 30 WNW 2/17 34/22/28/-1/T/T/353/55 31 NW 2/18 44/28/36/+7/0/0/374/58 39 W 2/19 41/28/35/+6/T/T/440/68 40 W AERO 38 MPH W 2/20 47/29/38/+9/0/0/636/98 32 WNW AERO 30 MPH WNW 2/21 39/27/33/+4/0/0/398/61 35 WNW AERO 35 MPH WNW 2/22 45/25/35/+5/0/0/562/86 27 WNW 2/23 37/31/34/+4/0.15/T/000/00 33 ENE 2/24 43/32/38/+8/N/A/0.5/000/00 39 ENE AERO 37 MPH ENE 2/25 45/37/41/+10/N/A/0/000/00 55 ENE AERO 55 MPH ENE 2/26 our morning low temp: 31F; the normal low is now 23F NEW DAILY RECORDS FOR FEBRUARY 2010 None. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 26 HIGH 67F IN 1957 LOW -7F IN 1928 PRECIP 2.24 INCHES IN 1979 SNOWFALL 11.1 INCHES IN 1933 PEAK GUST 66 MPH W IN 1961 RECORDS FOR FEBRUARY 27 HIGH 61F IN 1976 LOW -8F IN 1900 PRECIP 0.90 INCHES IN 1922 SNOWFALL 6.0 INCHES IN 1922 PEAK GUST 67 MPH W IN 1985 TODAY'S REPORT PREPARED BY: Robert Skilling