Thursday, July 30, 2015

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 30, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

VERY WARM AND HUMID OVERNIGHT INTO THIS MORNING
HIGH READING OF 92F ON WEDNESDAY OVERNIGHT LOW 72F
VERY HAZY CONDITIONS THIS MORNING VISIBILITY 8 MILES
Today’s Observations:

7 A.M.
Weather: Partial obscurement, scattered cirrus SW-WNW,
haze obscuring 1/10 of sky
Temperature: 77F; Dew Point: 71F; Wind: SW at 9 kts
Sea-level pressure: 29.91 ins. Hg, rising slightly
Visibility: 8 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 72F
24-hr precip: 0.00
BHO SA 1155 -X 250 SCT 8 127/77/71/2209/991/ H1 FEW CI SW-WNW
HAZY ALQDS/ 8/001 53002 10077 20072

10 A.M.
Weather: Scattered cumulus/moderate cumulus forming, overcast of
mostly dense cirrus, thin spots in overcast
Temperature: 85F; Dew Point 71F; Wind: SSW at 12 kts
Sea-level pressure: 29.88 ins. Hg, falling
Visibility: 15 miles, except 20 miles WNW, hazy
BHO SA 1455 35 SCT E220 OVC 15 118/85/71/2112/988/ FEW MDT CU
FRMG DNS CI ALQDS THN SPTS IOVC VSBY WNW 20 HAZY ALQDS/ 8/202 58009

1 P.M.
Weather: Broken variable scattered cumulus, towering cumulus, moderate
cumulus, broken dense cirrus, overcast mostly thin cirrus
Temperature: 87F; Dew Point: 71F; Wind: SSW at 18G23 kts
Sea-level pressure: 29.84 ins. Hg, falling, then more quickly
Visibility: 15 miles, hazy
6-hr Max temp: 88F
6-hr Min temp: 77F
BHO SA 1755 35 SCT E45 BKN 200 BKN 250 OVC 15 104/87/71/2118G23/984/
35/45 BKN V SCT MDT CU FEW TCU ALQDS PTCHS DNS CI HIER CLDS MSTLY THN
PTCHS DNS/ 8/202 58014 10088 20077

SUMMARY FOR WEDNESDAY, JULY 29, 2015

TEMPERATURE (DEGREES F)
MAX…..92   NORMAL…..81
MIN…..70   NORMAL…..63
MEAN….81   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+9
TOTAL DEPARTURE FOR THE MONTH…………………..+32 [+0.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..16   DEPARTURE……….+8
TOTAL COOLING UNITS FOR THE MONTH………….227   DEPARTURE………+19
TOTAL COOLING UNITS FOR THE SEASON…………365   DEPARTURE………+28
TOTAL COOLING UNITS LAST SEASON TO DATE…….327   DIFFERENCE……..+38

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21  W   AT  2:53 P.M.
ASOS……………………22  W   AT  2:52 P.M.
DAVIS…………………..17  W   AT  2:04 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………14  W   AT  3:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15  W   AT  3:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12  SSW AT  8:06 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.3 WSW
ASOS……………………8.9
DAVIS…………………..6.5 WSW [250 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.15
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.99  DEPARTURE…..-0.72
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-3.42
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

7/1  80/63/72/+2/0.59/466/51               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/721/79               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/867/95               17 SSW RMY 17
7/4  74/61/68/-3/T/109/12                  16 S   RMY N/A
7/5  82/58/70/-1/0.00/865/95               20 WSW RMY 20
7/6  85/64/75/+4/0.00/755/83               20 S   RMY 21
7/7  84/65/75/+4/0.02/445/49               35 S   RMY 40
7/8  87/68/78/+6/T/372/41                  23 NE  RMY N/A
7/9  73/61/67/-5/…./390/43               24 NE  RMY 25
7/10 80/59/70/-2/…./535/59               18 W   RMY N/A TSTM
7/11 84/61/73/+1/0.00/868/96               21 NW  RMY 19
7/12 88/67/78/+6/0.00/813/90               20 W   RMY 17
7/13 82/66/74/+2/0.00/424/47               21 E   RMY 20
7/14 81/64/73/+1/…./396/44               25 S   RMY 27
7/15 84/61/73/+1/…./297/33               24 ENE RMY 26
7/16 72/56/64/-8/0.00/852/95               25 NNE RMY 24
7/17 79/56/68/-4/0.00/708/79               21 S   RMY N/A
7/18 76/63/70/-2/0.16/027/03               29 SSW RMY 30  TSTM
7/19 89/68/79/+7/0.01/509/57               25 SSW RMY 27
7/20 90/73/82/+10/0.00/793/89              24 W   RMY 26
7/21 87/70/79/+7/T/267/30                  24 W   RMY 25
7/22 82/64/73/+1/T/727/82                  24 WNW RMY 26
7/23 81/62/72/+0/0.00/753/85               22 W   RMY 23
7/24 80/60/70/-2/T/663/75                  23 N   RMY 25
7/25 71/59/65/-7/0.00/265/30               20 ENE RMY N/A
7/26 78/59/69/-3/T/…/..                  24 SSE RMY 25  TSTM
7/27 84/67/76/+4/T/…/..                  24 S   RMY N/A TSTM
7/28 89/68/79/+7/0.00/…/..               18 S   RMY N/A
7/29 92/70/81/+9/0.00/…/..               21 W   WMY N/A

7/30 low since midnight is 72F; normal low is now 63F

DAILY RECORDS FOR JULY 2015

7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015
surpasses previous record of 1.68 in. in 1933

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW IN 1953, 43 SW IN 1971

TODAY’S REPORT PREPARED BY: Robert Skilling