Sunday, July 26, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JULY 26, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOL DAY YESTERDAY AVERAGING 7 DEGREES BELOW NORMAL.
WARM FRONT MOVING THROUGH TODAY WITH A FEW LIGHT SHOWERS
TEMPS. RISING SINCE LOW OF 59F AT MIDNIGHT

July temperatures are now averaging very close to normal after
a very cool day yesterday averaging well below normal. The warm
front moving through today is bringing dew points into the 60’s.
Just two very light showers were observed here late this morning.

Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, broken altocumulus and then
overcast altocumulus, few bright spots in overcast, altocumulus
of chaotic sky and few altocumulus castellanus past hour
Temperature: 64F; Dew Point: 62F; Wind: S at 9 kts
Sea-level pressure: 30.04 ins. Hg, rising, then more slowly
Visibility: 15 miles, except 20 miles SE, thin fog all quadrants
6-hr Max temp: 64F
6-hr Min temp: 59F
24-hr precip: 0.00
BHO SA 1155 5 SCT E70 BKN 90 OVC 15 173/64/62/1709/004/ AC CHAOTIC/
FEW ACC VSB PST HR FEW BRGT SPTS IOVC VSBY SE 20 THN FG ALQDS/ 8/67/
53003 10064 20059

10 A.M.
Weather: Overcast stratus fractus and stratus
Temperature: 66F; Dew Point 57F; Wind: S at 9 kts
Sea-level pressure: 30.04 ins. Hg, steady
Visibility: 25 miles, thin fog and hazy
3-hr. precip: trace
BHO SA 1455 E9 BKN 16 OVC 25 173/67/64/1709/004/ THN FG HAZY/
8/6// 50000 MANUAL 6000/

1 P.M.
Weather: Scattered cumulus, few moderate, scattered stratocumulus,
overcast altocumulus
Temperature: 74F; Dew Point: 67F; Wind: S at 11 kts,
Sea-level pressure: 30.02 ins. Hg, and falling then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 64F
6-hr precip: trace
BHO SA 1755 16 SCT 22 SCT E70 OVC 25 165/74/67/1811/002/
CU/FEW MDT CU SML BINOVC BRIGHT SPOTS INOVC HAZY/ 8/87/ 56008
MANUAL 6000/ 10075 20064

SUMMARY FOR SATURDAY, JULY 25, 2015

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..81
MIN…..59   NORMAL…..63
MEAN….65   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………-7
TOTAL DEPARTURE FOR THE MONTH…………………..+15 [+0.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-8
TOTAL COOLING UNITS FOR THE MONTH………….182   DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE SEASON…………320   DEPARTURE………+14
TOTAL COOLING UNITS LAST SEASON TO DATE…….302   DIFFERENCE……..+18

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20  ENE AT  1:59 P.M.
ASOS……………………19  ENE AT  1:59 P.M.
DAVIS…………………..17  ENE AT 10:28 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………13  ENE AT  2:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14  ENE AT  2:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12  ENE AT  2:00 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.3 ENE
ASOS……………………8.8
DAVIS…………………..4.6 ENE [0701 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…..-0.14
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-2.84
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 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 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

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

TODAY’S REPORT PREPARED BY: Robert Skilling