Friday, July 24, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 24, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL TEMPS OVERNIGHT DIP TO 59F, CLEAR SKIES
GIVE WAY TO DEVELOPING STORMS AND SHOWERS

Following a picturesque summer day yesterday,
clear and cool conditions have slowly given way
to developing cumulus and approaching altocumulus
and cirrostratus, associated with an impending front
to our NW.

By the 1:00 PM EST observation cumulus were growing
and forming light rain showers in all directions with
a trace of new rain falling from one brief rain shower
that occurred just before observation time. Moderate
or towering cumulus could be seen in most directions
with more showers on the way.
Today’s Observations:

7 A.M.
Weather: Clear, few cumulus distant offshore E-SSE,
few altocumulus distant WNW-N, few cirrostratus NW-NNE
Temperature: 66F; Dew Point: 56F; Wind: NW at 7 kts
Sea-level pressure: 29.93 ins. Hg, rising, then more slowly
Visibility: 80 miles, except 70 miles WNW-N
6-hr Max temp: 66F
6-hr Min temp: 59F
24-hr precip: none
BHO SA 1155 CLR 80 135/66/56/3107/993/ VSBY 70 MI WNW-N FEW CU
DSNT OFFSHR E-SSE FEW AC DSNT WNW-N FEW CS DSNT NW-NNE/ 8/135
51010 10066 20059

10 A.M.
Weather: Scattered altocumulus, few cumulus in all directions,
moderate cumulus distant N
Temperature: 75F; Dew Point 54F; Wind: NNW at 9G17 kts
Sea-level pressure: 29.92 ins. Hg, rising, then falling and lower
Visibility: 80 miles, except 60 miles WNW-NNE
BHO SA 1455 100 SCT 80 133/75/54/3309G17/992/ VSBY 60 MI WNW-NNE
MDT CU DSNT N FEW CU ALQDS/ 8/230 58002

1 P.M.
Weather: Light rain shower begins 12:32 ends 12:36 PM EST,
Showers in all directions, scattered cumulus, broken stratocumulus,
broken altocumulus, moderate cumulus NE
Temperature: 76F; Dew Point: 57F; Wind: estimated NNE at 4 kts,
Wind Speed and Direction: Light and Variable
Sea-level pressure: 29.92 ins. Hg, falling, then rising but lower
Visibility: 60 miles, except 40 miles SE, obscured by rain showers
6-hr Max temp: 79F
6-hr Min temp: 66F
6-hr precip: Trace
BHO SA 1755 40 SCT E60 BKN 110 BKN 60 132/76/57/E0204/992/
RW-B32E36 VSBY SE 40 MI SHWRS ALQDS MDT CU NE WND LGT AND VRB/
8/230 55001 MANUAL 6000/ 10079 20066
SUMMARY FOR THURSDAY, JULY 23, 2015

TEMPERATURE (DEGREES F)
MAX…..81   NORMAL…..81
MIN…..62   NORMAL…..63
MEAN….72   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+0
TOTAL DEPARTURE FOR THE MONTH…………………..+24 [+0.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….176   DEPARTURE………+15
TOTAL COOLING UNITS FOR THE SEASON…………314   DEPARTURE………+24
TOTAL COOLING UNITS LAST SEASON TO DATE…….290   DIFFERENCE……..+19

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22  W   AT 10:58 A.M.
ASOS……………………23  WNW AT 10:58 A.M.
DAVIS…………………..21  W   AT 10:57 A.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………16  W   AT 10:55 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17  W   AT 10:56 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14  W   AT 10:57 A.M.
AVERAGE WIND SPEED AND DIRECTION……………8.5 WNW
ASOS……………………8.9
DAVIS…………………..6.1 WNW  [293 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.14
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.99  DEPARTURE…..+0.13
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-2.57
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/…./…/..               24 ENE RMY 26
7/16 72/56/64/-8/0.00/…/..               25 NNE RMY 24
7/17 79/56/68/-4/0.00/…/..               21 S   RMY N/A
7/18 76/63/70/-2/0.16/…/..               29 SSW RMY 30  TSTM
7/19 89/68/79/+7/0.01/…/..               25 SSW RMY 27
7/20 90/73/82/+10/0.00/…/..              24 W   RMY 26
7/21 87/70/79/+7/T/…/..                  24 W   RMY 25
7/22 82/64/73/+1/T/…/..                  24 WNW RMY 26
7/23 81/62/72/+0/0.00/…/..               22 W   RMY 23

7/24 low since midnight is 59F; 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 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

RECORDS FOR JULY 25
HIGH 94F IN 1963,1987
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972

TODAY’S REPORT PREPARED BY: Brian Fitzgerald