Friday, July 22, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 22, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT, DRY WEATHER CONTINUES WITH HIGHEST TEMPERATURES OF
THE YEAR

After reaching 89F yesterday, the temperature had already risen
to 94F by the 1:00 observation this afternoon, the warmest temperature
of the year so far. This morning’s low fell to only 70F.  While these
temperatures are impressive, today’s record of 99F is well out of reach.
Dew points have crept into the mid 60s today, more humid than recent days
but not quite to oppressive levels. Yesterday was another dry day, with
our monthly rainfall deficit nearing two inches and our yearly deficit
over seven inches.

Mid and high level clouds were numerous to start the day, but have been
largely replaced by cumulus that began to bubble up by mid-morning.
A steady breeze has been present from the SW at around 15mph, gusting
over 30mph. Visibility has only been around 25-30 miles, with hazy
conditions present.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrus
Temperature: 76F; Dew Point: 64F; Wind: SSW at 14G21 kts
Sea-level pressure: 29.92 ins. Hg, falling then falling more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 70F
24-hr precip: 0.00 in.
BHO SA 1155 180 SCT E250 BKN 25 132/76/64/2114G21/992/ HAZY/
8/051 58008 10076 20070

10 A.M.
Weather: Scattered cumulus, scattered altocumulus, few altocumulus
castellanus NW
Temperature: 87F; Dew Point: 66F; Wind: SW at 11 kts
Sea-level pressure: 29.88 ins. Hg, falling, then falling more slowly
Visibility: 30 miles, distant haze
BHO SA 1455 70 SCT 110 SCT 30 118/87/66/2311/988/
FEW ACC NW DSNT HZ/ 8/180 56014

1 P.M.
Weather: Scattered cumulus
Temperature: 92F; Dew Point: 67F; Wind: WSW at 19G26 kts,
Wind: Peak wind 28 kts SW at 12:14 P.M.
Wind: Direction variable SW-W
Sea-level pressure: 29.80 ins. Hg, falling then falling more slowly
Visibility: 30 miles, distant haze
6-hr Max temp: 94F
6-hr Min temp: 76F
BHO SA 1755 50 SCT 30 091/92/67/2519G26/980/ DSNT HZ
PK WND 2328/14/ WND 22V29/ 8/100 56027 10094 20076

SUMMARY FOR THURSDAY, JULY 21, 2016

TEMPERATURE (DEGREES F)
MAX…..89   NORMAL…..81
MIN…..63   NORMAL…..63
MEAN….76   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH…………………..+29 [+1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..11   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE MONTH………….177   DEPARTURE………+32
TOTAL COOLING UNITS FOR THE SEASON…………334   DEPARTURE………+60
TOTAL COOLING UNITS LAST SEASON TO DATE…….299   DIFFERENCE……..+35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28  W    AT   2:15 P.M.
AEROVANE………………..26  W    AT  10:15 A.M.
ASOS……………………27  W    AT  10:15 A.M.
DAVIS…………………..25  WSW  AT  10:24 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………19  W    AT   2:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21  W    AT   2:16 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18  WSW  AT   2:01 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.1 WSW
ASOS…………………..12.1
DAVIS………………….10.8 WSW [239 Deg.] *Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.70  DEPARTURE……-1.89
ASOS…………..0.66
TOTAL PRECIPITATION FOR THE YEAR……….22.39  DEPARTURE……-7.17
ASOS………….22.78

PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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  84/67/76/+6/0.20/520/57                 32 S   AERO 35 S   RMY 34 TSTM
7/2  76/61/69/-1/0.00/811/91                 31 W   AERO 34 W   RMY 32
7/3  83/57/70/-1/0.00/766/84                 23 W   AERO 23 W   RMY 23
7/4  87/61/74/+3/0.00/847/93                 28 SSW AERO 28 SSW RMY 28
7/5  80/65/73/+2/0.29/309/34                 16 S   AERO 16 S   RMY N/A
7/6  92/68/80/+9/0.00/864/95                 22 WSW AERO 24 WSW RMY 22
7/7  77/61/69/-2/0.00/409/45                 21 NE  AERO 20 ENE RMY N/A
7/8  67/58/63/-9/0.02/000/00                 25 NE  AERO 25 NE  RMY 26
7/9  64/57/61/-11/0.09/000/00                20 NE  AERO 18 NE  RMY 17
7/10 66/56/61/-11/0.04/000/00                16 NE  AERO 16 NE  RMY 16
7/11 77/56/67/-5/0.00/415/46                 20 NNE AERO 21 NNE RMY 20
7/12 86/60/73/+1/0.00/848/94                 23 S   AERO 23 S   RMY 23
7/13 89/64/77/+5/0.00/874/97                 30 S   AERO 30 S   RMY 33
7/14 84/66/75/+3/0.01/…/..                 38 S   AERO 41 S   RMY 43
7/15 93/71/82/+10/0.00/…/..                23 W   AERO 23 W   RMY 23
7/16 93/69/81/+9/0.00/…/..                 25 WSW AERO 24 WSW RMY 24
7/17 83/72/78/+6/0.00/…/..                 18 ENE AERO 16 ENE RMY 19 TSTM
7/18 93/70/82/+10/0.05/…/..                41 WNW AERO 41 WNW RMY 43 TSTM
7/19 85/62/74/+2/0.00/…/..                 28 NW  AERO 28 NW  RMY 27
7/20 83/59/71/-1/0.00/…/..                 23 NW  AERO 23 NW* RMY 24
7/21 89/63/76/+4/0.00/…/..                 28 W   AERO 26 W   RMY N/A

7/22 low temp since midnight is 70F; normal low is now 63F

DAILY RECORDS FOR JULY 2016
None so far.

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

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INS IN 1900
PEAK GUST 55 MPH IN 1983

RECORDS FOR JULY 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

TODAY’S REPORT PREPARED BY: Jonathan O’Brien