Thursday, July 21, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 21, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER TEMPERATURES AND CLEARER SKIES WHILE DEW POINTS REMAIN LOW

Temperatures were slightly warmer today with the peak temperature
at 1:00PM EST reaching 88F, 5F more than yesterday’s max. temp.
The overnight low was also 4F warmer than yesterday at 63F.  Skies
were clearer with just few cumulus noted at the 10:00AM and 1:00PM
observations, and scattered cirrus appearing in the early afternoon.
Dew points remained in the 50s with relative humidities plummeting
to the 30-40% range.

Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 69F; Dew Point: 54F; Wind: WNW at 9 kts
Sea-level pressure: 30.15 ins. Hg, rising, then steady
Visibility: 70 miles, distant fog
6-hr Max temp: 69F
6-hr Min temp: 63F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 209/69/54/2509/015/ SKC DSNT FG/
8/000 50004 10069 20063

10 A.M.
Weather: Few cumulus E-N, few cirrus in all directions
Temperature: 81F; Dew Point: 55F; Wind: W at 11G19 kts
Sea-level pressure: 30.12 ins. Hg, falling, then more quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 201/81/55/2611G19/012/ FEW CU E-N
FEW CI ALQDS/ 8/101 58008

1 P.M.
Weather: Few cumulus E-WSW and NW, scattered cirrus
Temperature: 88F; Dew Point: 50F; Wind: W at 11G19 kts
Sea-level pressure: 30.07 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 88F
6-hr Min temp: 69F
BHO SA 1155 250 SCT 70 183/88/50/2611G19/007/ FEW CU
E-WSW AND NW SMALL FIRE N OF STN CAUSING LGT SMK/
8/101 58018 10088 20069

SUMMARY FOR WEDNESDAY, JULY 20, 2016

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..81
MIN…..59   NORMAL…..63
MEAN….71   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………-1
TOTAL DEPARTURE FOR THE MONTH…………………..+25 [+1.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………6   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH………….166   DEPARTURE………+29
TOTAL COOLING UNITS FOR THE SEASON…………323   DEPARTURE………+57
TOTAL COOLING UNITS LAST SEASON TO DATE…….285   DIFFERENCE……..+38

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NW   AT  1:58 P.M.
AEROVANE………………..23 W    AT  1:40 P.M.*
ASOS……………………23 NW   AT  1:47 P.M.
DAVIS…………………..22 WNW  AT  1:58 P.M. RMY 24
FASTEST MILE FOR YESTERDAY…………………14 WNW  AT  3:13 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 NW   AT  1:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 WNW  AT  1:48 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.4 NW
ASOS…………………..9.2
DAVIS………………….8.0 WNW [300 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……-1.76
ASOS…………..0.66
TOTAL PRECIPITATION FOR THE YEAR……….22.39  DEPARTURE……-7.04
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 low temp since midnight is 63F; 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 21
HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle