BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JULY 26, 2011 ALL TIMES ARE IN EASTERN STANDARD TIME MUCH NEEDED RAINFALL FALLS ON SUMMIT; TEMPERATURES WARM, DEW POINTS INCREASE The observatory measured 0.41 inch of much needed rainfall this morning. Temperatures have risen respectfully, with a wind have shift from easterly to southerly overnight. Dew points have remained in the 60s today providing the area with more humidity. Visibility has increased since this morning as the low level fog/stratus dissipated. Tonight, expect a chance of showers and thunderstorms with the possibility of strong wind gusts. Tomorrow, a high pressure system will build into the area, providing more clearing, higher temperatures and lower humidity. Below is the listing of our warmest Julys: Warmest July Corrected Mean Temperature (deg F) (also warmest for all months of the year) 1) 75.1 in 2010 2) 74.9 in 1952 3) 74.1 in 1994 4) 73.8 in 1999 5) 73.5 in 1949 Today's observations: 7 A.M. Weather: Fog, sky partially obscurred by fog/stratus, broken altocumulus two layers, stratus occasionally drifting over summit, stratus/stratus fractus below summit all quadrants, few altocumulus lenticularis W-NNW Temperature: 65F, Dew point: 63F; Wind: S at 4 kts Sea-level pressure: 29.79 inches Hg, steady (falling, then rising) Visibility: 1 mile, variable 1/2 mile NE-SE, 2 miles WSW-WNW 6-hour min. temp: 62F 24-hour precip: 0.41 inch BHO SA 1155 –X E60 BKN 80 BKN 1VF 087/65/63/1904/979 F3 STRA OCNLY DRFTG OVR SMT STRA/STFRA BLO SMT ALQDS FEW ACSL W-NNW VSBY 1/2V2 NE-SE 1/2 WSW-WNW 2/ 8/640 55000 MANUAL 70041 ASOS 70039 10065 20062 10 A.M. Weather: Broken statocumulus, overcast stratus, hazy Temperature: 70F, Dew Point: 66F; Wind: SW at 5 kts Wind: Direction gradually veering (clockwise) past hour Sea-level pressure: 29.78 inches Hg, falling Visibility: 20 miles, hazy BHO SA 1455 E15 BKN 20 OVC 20 083/70/66/2205/978/ HAZY WND GRDLY VEERING PST HR/ 8/5// 58004 1 P.M. Weather: Broken stratocumulus with stratocumulus dissipating and forming cumulus, hazy Temperature: 76F, Dew Point: 67F; Wind: SSW at 7 kts Sea-level pressure: 29.72 inches Hg, falling Visibility: 25 miles, hazy 6-hour max. temp: 77F BHO SA 1755 E20 BKN 25 066/76/67/2007/972 SC DSPTG CU FRMG HAZY 8/500 58017 10077 20065 WEATHER SUMMARY FOR MONDAY, JULY 25 TEMPERATURE (DEGREES F) MAX.....74 NORMAL.....82 MIN.....59 NORMAL.....63 MEAN....67 NORMAL.....73 DEPARTURE FROM 30-YEAR NORMAL...................-6 TOTAL DEPARTURE FOR THE MONTH...................+81 [+3.0 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............16 ESE AT 6:37 P.M. AEROVANE...............23 ESE AT 6:40 P.M. ASOS...................20 ESE AT 6:38 P.M. DAVIS..................19 E AT 6:33 P.M. THE FASTEST MILE FOR YESTERDAY............14 ESE AT 6:37 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............14 ESE AT 8:07 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............15 E AT 6:36 P.M. AVERAGE WIND SPEED AND DIRECTION........6.8 ESE ASOS.................6.3 DAVIS................6.6 E [087 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.41 DEPARTURE.........-0.12 ASOS..............0.39 TOTAL PRECIPITATION FOR THE MONTH..........2.22 DEPARTURE.........-0.80 ASOS..............2.17 TOTAL PRECIPITATION FOR THE YEAR..........29.53 DEPARTURE.........+0.84 ASOS..............30.03** **ASOS data is in error due to system failure on 1/12-13 PRELIMINARY CLIMATE SUMMARY FOR JULY 2011 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/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 7/1 78/59/69/-1/0.01/530/58 15 WNW 7/2 80/61/71/+1/0.00/603/66 17 SE 7/3 79/64/72/+2/0.02/018/02 22 S 7/4 86/68/76/+6/0.00/583/64 18 SW 7/5 89/66/78/+7/0.00/784/86 15 S 7/6 88/68/78/+7/T/792/87 30 WNW AERO 35 MPH TSTM 7/7 86/67/77/+6/0.00/481/53 17 WNW 7/8 74/65/70/-1/0.47/027/03 16 ESE TSTM 7/9 81/63/72/+1/0.11/698/77 29 WNW 7/10 83/59/71/0/0.00/860/95 21 SSW 7/11 89/65/77/+5/0.00/814/90 23 S 7/12 90/72/83/+9/0.00/777/86 25 W 7/13 85/61/73/+1/0.73/469/52 21 NE 7/14 70/58/64/-8/0.37/801/89 28 NNE TSTM 7/15 79/59/69/-3/0.00/692/77 17 SSW TSTM 7/16 85/61/73/+1/0.00/834/93 15 SW 7/17 88/67/78/+6/0.00/797/89 30 SSW 7/18 84/70/77/+5/0.02/188/21 38 WSW AERO 43 MPH 7/19 86/69/78/+6/0.00/777/87 18 WNW AERO 24 MPH 7/20 88/69/79/+7/0.00/766/86 29 SSW 7/21 93/68/81/+9/0.00/685/77 37 SSW AERO 43 MPH 7/22 99/76/88/+16/0.00/852/96 28 W AERO 36 MPH 7/23 90/68/79/+7/0.05/469/53 25 WNW 7/24 80/63/72/-1/0.03/274/31 20 NW AERO 27 MPH 7/25 74/59/67/-6/..../.../.. 16 ESE 7/26 morning low 62F; normal low is now 63F DAILY RECORDS FOR JULY 2011 7/22 - RECORD HIGH MAXIMUM TEMPERATURE OF 99F; ties the previous record of 99F set in 1926 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 26 HIGH 97F IN 1963 LOW 47F IN 1920 PRE 2.05 INS IN 1899 WIND 74e MPH NNW IN 1940 RECORDS FOR JULY 27 HIGH 95F IN 1949, 1963 LOW 50F IN 1920, 2001 PRE 4.01 INS IN 1979 WIND 47 MPH ENE IN 1984 TODAY'S REPORT PREPARED BY: Sean Fankhauser/George Tabeek