Monday, July 27, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 27, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

BRIEF THUNDERSTORM MOVES THROUGH OVERNIGHT,
HEAVY SHOWERS ALONG THE SOUTH COAST THIS MORNING

An isolated thunderstorm moved just north of the station
overnight last night beginning 11:35 PM EST and lasting
into this morning and ending at 12:50 AM EST. Only a trace
of rain fell at the station with heavier downpours reported
elsewhere.

Heavy rain showers have been visible along the South Coast
this morning with hazy and humid conditions visible elsewhere.
By the 1:00 PM EST observation three separate cumulonimbus were
visible and distant to the W, WNW and NW moving slowly to the
SE. A few towering cumulus were visible just north of the
city as well under mostly sunny conditions and hazy visibility.
Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrus, few
altocumulus castellanus in all directions, showers
distant SSE-SW
Temperature: 71F; Dew Point: 65F; Wind: WSW at 9 kts
Sea-level pressure: 30.03 ins. Hg, rising, then more slowly
Visibility: 25 miles, except 10 miles SSE-SW, obscured by
showers and hazy
6-hr Max temp: 71F
6-hr Min temp: 67F
24-hr precip: Trace
BHO SA 1155 40 SCT E250 BKN 25 170/71/65/2509/003/
VSBY SSW 10 MI SHWRS DSNT SSE-SW FEW ACC ALQDS HAZY/ 8/084
51009 10071 20067

10 A.M.
Weather: Scattered altocumulus, broken cirrus,
few cumulus/cumulus fractus in all directions
Temperature: 77F; Dew Point 68F; Wind: SSW at 10 kts
Sea-level pressure: 30.06 ins. Hg, rising, then more quickly
Visibility: 25 miles, hazy
BHO SA 1455 170 SCT E250 BKN 25 178/77/68/2010/006/
FEW CU/CUFRA ALQDS HAZY/ 8/731 53008

1 P.M.
Weather: Cumulonimbus distant W, WNW and NW moving SE,
towering cumulus distant N, scattered altocumulus,
scattered cirrus, few cumulus distant S-E
Temperature: 82F; Dew Point: 68F; Wind: SSW at 9 kts,
Sea-level pressure: 30.01 ins. Hg, rising then falling and lower
Visibility: 20 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 71F
BHO SA 1755 70 SCT 250 SCT 20 164/82/68/2009/001/ CB DSNT W-NW
MVNG SE TCU DSNT N FEW CU S-E HAZY/ 8/931 58014 10083 20071
SUMMARY FOR SUNDAY, JULY 26, 2015

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..81
MIN…..59   NORMAL…..63
MEAN….69   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………-3
TOTAL DEPARTURE FOR THE MONTH…………………..+12 [+0.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH………….186   DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE SEASON…………324   DEPARTURE………+10
TOTAL COOLING UNITS LAST SEASON TO DATE…….310   DIFFERENCE……..+14

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24  SSE AT 10:44 A.M.
ASOS……………………26  S   AT 10:45 A.M.
DAVIS…………………..23  SSE AT 10:44 A.M. RMY 25
FASTEST MILE FOR YESTERDAY…………………17  SW  AT 11:14 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18  S   AT 11:08 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16  SW  AT 11:16 A.M.
AVERAGE WIND SPEED AND DIRECTION……………11.1 S
ASOS……………………11.8
DAVIS…………………..9.2  S [172 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE  DEPARTURE…..-0.14
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.99  DEPARTURE…..-0.28
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-2.98
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/T/…/..                  23 N   RMY 25
7/25 71/59/65/-7/0.00/…/..               20 ENE RMY N/A
7/26 78/59/69/-3/T/…/..                  24 SSE RMY 25

7/27 low since midnight is 67F; 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 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRE 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984

RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

TODAY’S REPORT PREPARED BY: Brian Fitzgerald