Saturday, July 25, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 25, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

BACKDOOR COLD FRONT BRINGS COOL AND CLOUDY CONDITIONS

Overcast skies and cool air were present for the 7 AM
Observation with temperatures in the lower 60’s.

By the 1:00 PM EST observation, the clouds had given way
to some sunny breaks as the pressure rose through the morning.
The pressure had begun to fall by the afternoon though as
temperatures approached 70 with dewpoints steady in the
upper 50’s.

Today’s Observations:

7 A.M.
Weather: Overcast AltoStratus, Hazy
Temperature: 62F; Dew Point: 58F; Wind: N at 9 kts
Sea-level pressure: 30.04 ins. Hg, rising, then more slowly
Visibility: 10 miles, Hazy
6-hr Max temp: 63F
6-hr Min temp: 62F
24-hr precip: T
BHO SA 1155 010 OVC 10 174/62/58/0409/004 8/6//
51017 10063 20062

10 A.M.
Weather: Broken Altocumulus, Few Cirrus, Hazy
Temperature: 64F; Dew Point 57F; Wind: N at 906 kts
Wind: Light
Sea-level pressure: 30.07 ins. Hg, rising
Visibility: 20 miles, Hazy
BHO SA 1455 E015 BKN 20 184/64/57/0506/007 FEW CI ALQDS WND LGT
8/064 53010

1 P.M.
Weather: Scattered Altocumulus, Scattered Cirrus. Hazy
Temperature: 69F; Dew Point: 58F; Wind: Variable at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.06 ins. Hg, and rising
Visibility: 35 miles, Hazy
6-hr Max temp: 69F
6-hr Min temp: 66F
BHO SA 1755 030 SCT 250 SCT 181/69/58/VRB06G16/006
WND LGT AND VRB 8/094 56003 10069 20066

SUMMARY FOR FRIDAY, JULY 24, 2015

TEMPERATURE (DEGREES F)
MAX…..80   NORMAL…..81
MIN…..60   NORMAL…..63
MEAN….70   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………-2
TOTAL DEPARTURE FOR THE MONTH…………………..+22 [+0.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………5   DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE MONTH………….181   DEPARTURE………+12
TOTAL COOLING UNITS FOR THE SEASON…………319   DEPARTURE………+21
TOTAL COOLING UNITS LAST SEASON TO DATE…….298   DIFFERENCE……..+21

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23  N   AT 12:00 P.M.
ASOS……………………26  N   AT 12:00 P.M.
DAVIS…………………..24  N   AT 11:58 A.M. RMY 25
FASTEST MILE FOR YESTERDAY…………………14  N   AT 12:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17  N   AT 12:01 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16  N   AT 11:58 A.M.
AVERAGE WIND SPEED AND DIRECTION……………7.8 NW
ASOS……………………8.0
DAVIS…………………..5.3 NW  [311 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………..2.99  DEPARTURE…..+0.00
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-2.70
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 80/60/70/-2/0.00/…/..               23 N   RMY 25

7/25 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 25
HIGH 94F IN 1963,1987
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972

RECORDS FOR JULY 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

TODAY’S REPORT PREPARED BY: Robert Millette