Sunday, July 23, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 23, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER TEMPERATURES CONTINUE

Temperatures rose only to 87F yesterday afternoon ending the
first heat wave at Blue Hill Observatory for Summer 2017.
Cooler temperatures continue today, reaching 72 by 1:00PM EST.
Dew points have also decreased into the mid-50s.

A trace of precip. was measured at the 7:00AM observation from
the evening storms which passed to the south of the region.
Once they had passed, wind direction changed to out of the
northeast.  Wind speeds have also increased to make today one
of the windiest days this month.

Today’s Observations:

7 A.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 66F; Dew Point: 55F; Wind: ENE at 13G20 kts
Sea-level pressure: 29.84 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 72F
6-hr Min temp: 65F
24-hr precip: Trace
BHO SA 1155 44 SCT 250 SCT 70 104/66/55/0613G20/984/
8/108 51023 10072 20065

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 70F; Dew Point: 55F; Wind: ENE at 11G19 kts
Sea-level pressure: 29.89 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 42 SCT 250 SCT 70 121/70/55/0611G19/989/ 8/101 51017

1 P.M.
Weather: Few cumulus SW and NW, scattered altocumulus, broken cirrostratus
Temperature: 70F; Dew Point: 53F; Wind: NE at 10G16 kts
Sea-level pressure: 29.90 ins. Hg, rising then falling
Visibility: 70 miles
6-hr Max temp: 72F
6-hr Min temp: 65F
BHO SA 1755 SCT 200 E250 BKN 70 126/70/53/0510G16/990/ FEW CU SW AND NW/
8/138 50005 10072 20065

SUMMARY FOR SATURDAY, JULY 22, 2017

TEMPERATURE (DEGREES F)
MAX…..87   NORMAL…..81
MIN…..70   NORMAL…..63
MEAN….79   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+38 [+1.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..14   DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE MONTH………….198   DEPARTURE………+45
TOTAL COOLING UNITS FOR THE SEASON…………399   DEPARTURE……..+117
TOTAL COOLING UNITS LAST SEASON TO DATE…….352   DEPARTURE………+47

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20 WNW AT 12:29 A.M.
AERO……………………20 WNW AT 12:30 A.M.
ASOS……………………21 WNW AT  1:26 A.M.
DAVIS…………………..19  W  AT 12:29 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………14 WNW AT  1:22 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 WNW AT  1:35 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 WNW AT  1:24 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.8 SSW
ASOS…………………..6.9
DAVIS………………….5.5 W [266 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.58  DEPARTURE……-1.14
ASOS…………..1.55
TOTAL PRECIPITATION FOR THE YEAR……….32.95  DEPARTURE……+3.26
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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
M:    Missing data

7/1  85/67/76/+6/T/439/48                  35 S   AERO 37 S   RMY 38
7/2  87/69/78/+8/T/785/86                  25 W*  AERO 28 W*  RMY 27
7/3  85/67/76/+5/0.00/894/98               28 W*  AERO 29 W   RMY 30
7/4  84/62/73/+2/0.00/783/86               17 W   AERO 17 W   RMY 18
7/5  82/62/72/+1/0.00/855/94               20 S   AERO 20 ENE RMY 20
7/6  82/60/71/+0/0.00/664/73               21 SSW AERO 22 SSW RMY 21
7/7  71/60/66/-5/0.63/000/00               28 ENE AERO 28 ENE RMY 27
7/8  84/61/73/+1/0.15/463/51               30 SW* AERO 32 SSW RMY 33  TSTM
7/9  81/60/71/-1/0.00/897/99               26 W   AERO 26 W   RMY 26
7/10 85/63/74/+2/T/751/83                  25 SW  AERO 25 S   RMY 26
7/11 82/66/74/+2/0.25/253/28               24 S   AERO 24 S   RMY N/A
7/12 85/68/77/+5/0.43/325/36               23 NE  AERO 22 NE  RMY 23  TSTM
7/13 68/55/62/-10/0.03/000/00              28 NNE AERO 28 NE  RMY 29
7/14 63/56/60/-12/0.02/…/..              15 E   AERO 14 E   RMY 14
7/15 80/60/70/-2/0.00/…/..               18 S   AERO 16 S   RMY 18
7/16 87/64/76/+4/0.00/…/..               18 SSE AERO 16 E   RMY 17
7/17 84/68/76/+4/0.00/…/..               25 S   AERO 25 S*  RMY 25
7/18 85/68/77/+5/0.07/…/..               23 S   AERO 23 S   RMY 23
7/19 90/70/80/+8/0.00/…/..               22 SW  AERO 22 SW* RMY 22
7/20 90/70/80/+8/0.00/…/..               21 WSW AERO 22 WSW RMY 21
7/21 90/68/79/+7/0.00/…/..               26 W   AERO 26 W   RMY 27
7/22 87/70/79/+7/T/…/..                  20 WNW AERO 20 WNW RMY N/A

7/23 Low temp since midnight is 65F; normal low is now 63F

DAILY RECORDS FOR JULY

None so far.

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

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

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle