BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JULY 29, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME TWO THUNDERSTORMS IN THE VICINITY EARLY THIS AFTERNOON Two thunderstorms passed to the south thru east and northeast of the summit early this afternoon. Only the first thunderstorm included some light to moderate rain with 0.10 inch while the second included a sudden cloud to ground lightning strike about 9 miles to the east at 12:48 P.M. There was no rain with the second storm here, but the Hingham Cooperative had 0.75 inches of rainfall in 30 minutes! This morning marked the 4th consecutive morning with 1/16 mile visibility in dense fog. BHO Greatest Number of 90-Degree Days per Month, (1885-2013) 1) 14 in July 1952 2) 13 in August 2002 3) 10 in August 1944 10 in July 1949 10 in July 1963 10 in July 2010 10 in July 2013 (through 7/28) 8) 9 in July 1911 9 in August 1928 10) 8 in August 1949 8 in July 1963 8 in July 1988 Today's Observations: 7 A.M. Weather: Sky partly obscured by fog, overcast stratus, fog obscuring 3/10 of sky, overcast partly thin overhead Temperature: 68F; Dew Point: 68F; Wind: SSE at 5 kts. Sea-level pressure: 30.04 ins. Hg, rising slightly Visibility: 1/16 mile, dense fog 24-hr precip: Trace 6-hr min. temp: 66F BHO SA 1155 –X E2 OVC 1/16F 174/68/68/1505/004/ F3 STRA DRFTG OVR SMT OVC PTLY THN OVHD SUN DMLY VSB/ 8/6// 52003 MANUAL 7000/ 10068 20066 10 A.M. Weather: Scattered cumulus, scattered stratocumulus, overcast altocumulus, few lower stratus fractus SE, moderate cumulus all quadrants, few altocumulus castellanus, higher cirrus visible, small breaks in overcast Temperature: 75F; Dew Point: 69F; Wind: S at 7 kts. Sea-level pressure: 30.06 ins. Hg, rising then falling Visibility: 20 miles, WNW 25 miles, thin fog BHO SA 1455 24 SCT E30 BKN 75 OVC 20 181/75/69/1707/006/ FEW LWR STFRA SE MDT CU ALQDS FEW ACC SE HIER CI VSB SML BINOVC ALQDS VSBY WNW 25 HAZY ALQDS/ 8/881 51007 1 P.M. Weather: Thunder, scattered cumulonimbus (N-SE) moving NE, scattered cumulus, moderate cumulus, few towering cumulus S-W-N, thunder began at 12:48 P.M. EST, briefly lightning cloud to ground estimated 9 miles E, earlier thunderstorm began at 12:13 P.M. EST and ended 12:35 P.M. EST moved NE, rain began at 12:04 P.M. EST and ended about 12:30 P.M. EST Temperature: 75F; Dew Point: 66F; Wind: SSW at 5 kts Sea-level pressure: 30.04 ins. Hg, falling then falling more slowly Visibility: 40 miles, except 25 miles NNW-NE, light distant haze 6-hr precip: 0.10 in. 6-hr max. temp: 80F BHO SA 1755 32 SCT 55 SCT 100 SCT 200 SCT 250 BKN 40T 174/75/66/2005/004/ TB48 BRFLY LTGCG 9 E TS E MOVG NE TB13E35 MOVD NE CB N-SE MOVG NE TCU/MDT S-W-N RB04E30 VSBY NE 12 E 10 SE 8 WNW 50/ 8/963 56007 MANUAL 60010 ASOS 60010 10080 20068 WEATHER SUMMARY FOR SUNDAY, JULY 28, 2013 TEMPERATURE (DEGREES F) MAX.....78 NORMAL.....81 MIN.....66 NORMAL.....63 MEAN....72 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.......................0 TOTAL DEPARTURE FOR THE MONTH....................+112 [+3.8 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................16 E AT 3:48 P.M. * AERO.....................15 ENE AT 3:35 P.M. ASOS.....................15 ENE AT 4:58 P.M. DAVIS....................14 N AT 5:21 A.M. RMY N/A FASTEST MILE FOR YESTERDAY..................12 ENE AT 2:40 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............13 ENE AT 2:55 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............11 ENE AT 2:40 P.M. AVERAGE WIND SPEED AND DIRECTION...........7.0 ENE ASOS....................7.1 DAVIS...................6.6 ENE [060 deg.] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace DEPARTURE............-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.99 DEPARTURE............-0.57 ASOS..............2.95 TOTAL PRECIPITATION FOR THE YEAR..........35.19 DEPARTURE............+4.66 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 82/69/76/+6/0.05/247/27 29 S AERO 31 MPH SSW RMY 32 7/2 82/61/72/+2/T/100/11 23 SSW AERO 23 MPH SSW RMY 25 7/3 87/62/75/+4/T/556/61 28 SW AERO 30 MPH SW RMY 30 7/4 90/71/81/+10/0.00/811/89 25 WSW AERO 26 MPH SW RMY 28 7/5 92/73/83/+12/0.00/874/96 24 W AERO 25 MPH WSW RMY 25 7/6 90/73/82/+11/0.00/836/92 25 WNW AERO 25 MPH WNW RMY 26 7/7 91/72/82/+11/0.21/508/56 38 SSW AERO 43 MPH SSW RMY 44 TSTM 7/8 82/64/73/+1/0.04/617/68 18 NE AERO 20 MPH NE RMY 20 TSTM 7/9 72/63/68/-4/0.01/054/06 14 ENE AERO 14 MPH ENE RMY 14 7/10 84/65/75/+3/T/335/37 32 S AERO 36 MPH S RMY 35 7/11 79/69/74/+2/0.62/009/01 23 W AERO 23 MPH W RMY N/A TSTM 7/12 70/62/66/-6/0.00/162/18 29 NE AERO 29 MPH NE RMY 30 7/13 75/62/69/-3/0.08/009/01 21 ENE AERO 20 MPH ENE RMY N/A 7/14 89/71/80/+8/0.00/477/53 16 W AERO 16 MPH W RMY 16 7/15 91/72/82/+10/0.00/665/74 17 NW AERO 16 MPH NW RMY 18 7/16 91/71/81/+9/0.00/843/94 18 NNW AERO 16 MPH NNW RMY 16 7/17 93/74/84/+12/0.00/841/94 22 SW AERO 23 MPH SW RMY 25 7/18 90/75/83/+11/0.00/724/81 20 S AERO 21 MPH S RMY 22 7/19 95/76/86/+14/0.00/723/81 36 WSW AERO 38 MPH WSW RMY 38 7/20 93/72/82/+10/0.00/570/64 29 W AERO 30 MPH W RMY 31 TSTM 7/21 82/68/75/+3/0.00/568/64 16 NE AERO 16 MPH NE RMY 17 7/22 80/67/74/+2/T/514/58 17 NE AERO 17 MPH NE RMY 19 7/23 82/68/75/+3/0.82/159/18 35 WSW AERO 36 MPH WSW RMY 39 TSTM 7/24 84/64/74/+2/0.00/.../.. 23 N AERO 23 MPH N RMY 23 7/25 64/57/61/-11/..../000/00 24 NNE AERO 24 MPH NNE RMY 25 7/26 67/59/63/-9/..../000/00 23 NNW AERO 23 MPH N RMY 23 7/27 82/60/71/-1/0.00/.../.. 22 S AERO 23 MPH S RMY 23 7/28 78/66/72/0/0.03/.../.. 16 ENE AERO 16 MPH ENE RMY 15 7/29 morning low temp: 66F; the normal low is now 63F DAILY RECORDS FOR JULY 2013 7/14 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1997 7/15 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F; surpasses previous record of 70F set in 1901, 1934, 1995 7/16 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1901, 1958, 1968 7/17 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F; ties previous record of 74F set in 1900 7/18 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F; surpasses previous record of 73F set in 1900, 1999 7/19 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F; surpasses previous record of 72F set in 1949, 1991, 2005 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 29 HIGH 97F IN 1949 LOW 53F IN 1888,1914 PRECIP 1.53 INCHES IN 1901 PEAK GUST 40e MPH E IN 1941 RECORDS FOR JULY 30 HIGH 99F IN 1949 LOW 51F IN 1956 PRECIP 1.84 INCHES IN 1976 PEAK GUST 70e MPH SW 1944 TODAY'S REPORT PREPARED BY: Robert Skilling, Mark Medlinskas, Kevin Pecora