Sunday, August 3, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 3, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

SHOWERS END THIS MORNING BUT MOSTLY CLOUDY CONDITIONS LINGER

Today started much like yesterday, with cool temperatures, lots of clouds,
and some light rain.  By mid-late morning, however, the rain stopped as
some drier air started to work in.  We’ve also seen the clouds break up
somewhat early this afternoon, with a few breaks of sunshine observed as
well, but the sky has remained mostly cloudy.  The temperature has risen to
just 71F so far this afternoon, which is well below average but a little
warmer than yesterday, when we had a high temperature of only 68F and the
temperature held in the low-mid 60s for much of the afternoon.  The
68F high for yesterday is the coolest high temperature since 67F on June 13,
and yesterday’s -8 degree mean temperature departure makes it the coolest
day relative to average since May 29.  Winds have been light and onshore
again today, averaging only about 5mph.  Rainfall from the past two days has
added up to only 0.12 inches.

JULY 2014 PRELIMINARY STATS

TEMPERATURE [deg. F]

Av. Max. 80.8
Av. Min. 63.5
Mean     72.2 [+0.3] 24-hour corr. mean: 72.0
Max. temp. for month: 91 on 3rd
Min. temp. for month: 55 on 5th
Total heating degree day units: None
Total cooling degree day units: 228
Total seasonal cooling   units: 337 [-14] Season [1/1 thru 7/31]

PRECIPITATION [ins.]

Total: 5.08 [+1.06] Greatest one calendar day: 2.48 [4th] *
Greatest in 24 hours 2.73 [4-5th] * new record for date; previous was 1.78 in 1950

WIND
Av. wind speed:       11.4 MPH
Av. corr. wind speed: 11.8 MPH
Prevailing direction: S @ 27% possible

SUNSHINE
Total astronomical minutes: 17566 of possible 27729 or 63%
Total Campbell Stokes card minutes: 16898 of possible 26682 or 63%

Today’s Observations:

7 A.M.
Weather: Light rain, scattered stratocumulus, broken altocumulus, overcast
altostratus, few stratus fractus below summit N-E, thin fog all quadrants
except NE-SE
Temperature: 61F; Dew Point: 61F; Wind: N at 2 kts,
Wind: Light
Sea-level pressure: 30.16 ins. Hg, rising then rising more rapidly
Visibility: 15 miles, except 30 miles NE-SE
6-hr max temp: 61F
6-hr min temp: 60F
24-hr precip: 0.10 inches
BHO SA 1155 10 SCT E120 BKN 140 OVC 15R- 213/61/61/E0102/016/
FEW STFRA BLO SMT N-E THN FG ALQDS XCPT NE-SE VSBY NE-SE 30 WND LGT/
8/57/ 53006 MANUAL 70010 ASOS 60001 70009 10061 20060

10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus, broken altocumulus
Temperature: 67F; Dew Point: 60F; Wind: E at 6 kts
Sea-level pressure: 30.15 ins. Hg, falling slightly
Visibility: 35 miles
3-hr precip: Trace
BHO SA 1455 15 SCT 70 SCT E110 BKN 35 211/67/60/1006/015/ 8/550 56002
MANUAL 6000/

1 P.M.
Weather: Scattered stratocumulus, broken altocumulus, overcast altostratus,
break in overcast SE
Temperature: 70F; Dew Point: 61F; Wind: ENE at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.13 ins. Hg, falling then falling more rapidly
Visibility: 35 miles, distant haze
6-hr max temp: 71F
6-hr min temp: 61F
6-hr precip: Trace
BHO SA 1755 15 SCT E85 BKN 150 OVC 35 204/70/61/E0705/013/ BINOVC SE
DSNT HZ/ 8/57/ 58007 MANUAL 6000/ 10071 20061

WEATHER SUMMARY FOR SATURDAY, AUGUST 2, 2014

TEMPERATURE (DEGREES F)
MAX…..68    NORMAL…..81
MIN…..59    NORMAL…..63
MEAN….64    NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….-8
TOTAL DEPARTURE FOR THE MONTH…………………….-5 [-2.7 DEGREE/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-7
TOTAL COOLING UNITS FOR THE MONTH………….10   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE SEASON………..347   DEPARTURE………-18
TOTAL COOLING UNITS LAST SEASON TO DATE……497   DIFFERENCE…….-150

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21  ESE  AT  1:51 P.M. *
ASOS…………………..23  ESE  AT  1:52 P.M.
DAVIS………………….21  E    AT  1:38 P.M. RMY 22
FASTEST MILE FOR YESTERDAY………………..16  ESE  AT  1:52 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..16  ESE  AT  1:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….15  ESE  AT  1:52 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.4 S
ASOS…………………..6.9
DAVIS………………….6.0 SE [126 deg.] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.10  DEPARTURE……….-0.05
ASOS…………..0.09
TOTAL PRECIPITATION FOR AUGUST………….0.12  DEPARTURE……….-0.18
ASOS…………..0.10
TOTAL PRECIPITATION FOR THE YEAR……….29.75  DEPARTURE……….-1.55
ASOS………….29.66

PRELIMINARY CLIMATE SUMMARY FOR JULY-AUGUST 2014 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  85/66/76/+6/0.00/695/76              31 SSW RMY 36
7/2  89/69/79/+9/T/639/70                 33 SSW RMY 38
7/3  91/68/80/+9/0.05/611/67              29 W   RMY 30  TSTM
7/4  72/61/67/-4/2.48/027/03              28 N   RMY N/A TSTM
7/5  77/55/66/-5/0.27/738/81              36 NW  RMY N/A
7/6  83/61/72/+1/0.00/892/98              29 SW  RMY 33
7/7  85/65/75/+4/T/563/62                 33 SW  RMY 38  TSTM [NO RAIN] 7/8  89/70/80/+8/0.00/763/84              31 SW  RMY 38
7/9  86/70/78/+6/0.00/779/86              28 SSW RMY N/A
7/10 80/65/73/+1/0.00/597/66              16 NW  RMY N/A
7/11 76/62/69/-3/0.00/732/81              22 NE  RMY N/A
7/12 85/60/73/+1/0.00/849/94              21 S   RMY 25
7/13 82/64/73/+1/0.01/676/75              31 S   RMY 35
7/14 83/69/76/+4/0.54/207/23              25 S   RMY 27
7/15 82/70/76/+4/0.02/135/15              26 S   RMY 29 TSTM
7/16 73/65/69/-3/0.98/000/00              27 SSW RMY 32 TSTM
7/17 79/62/71/-1/T/573/64                 15 WSW RMY 17
7/18 80/60/70/-2/0.00/822/92              15 NW  RMY 16
7/19 77/63/70/-2/0.00/054/06              13 E   RMY 14
7/20 72/60/66/-6/T/312/35                 16 ENE RMY 16
7/21 76/59/68/-4/0.00/667/75              16 E   RMY 19
7/22 88/63/76/+4/0.00/816/92              22 SSW RMY 25
7/23 88/68/78/+6/0.00/770/87              29 S   RMY 32
7/24 74/63/69/-3/0.01/291/33              18 ENE RMY 18
7/25 80/56/68/-4/0.00/811/92              18 NW  RMY N/A
7/26 82/63/73/+1/0.00/616/70              28 SSW RMY 32
7/27 75/65/70/-2/0.61/097/11              28 SSE RMY 30 TSTM
7/28 81/65/73/+1/0.11/552/63              36 S   RMY 40 TSTM
7/29 78/60/69/-3/0.00/751/86              22 WNW RMY 24
7/30 78/59/69/-3/0.00/749/86              16 W   RMY 18
7/31 80/61/71/-1/0.00/782/90              27 S   RMY 29

8/1  86/63/75/+3/0.00/…/..              25 S   RMY 29
8/2  68/59/64/-8/…./…/..              21 ESE RMY 22

8/3  morning low of 60F; the normal low is now 63F

DAILY RECORDS FOR JULY 2014:

7/4  NEW DAILY RECORD RAINFALL OF 2.48 ins;
surpasses previous record of 1.78 ins. in 1950
7/16 NEW DAILY RECORD RAINFALL OF 0.98 ins;
surpasses previous record of 0.89 ins. in 1919

DAILY RECORDS FOR AUGUST 2014:
None so far.

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

RECORDS FOR AUGUST 3
HIGH 96F IN 1930
LOW 50F IN 1976
PRECIP 1.45 INCHES IN 1979
PEAK GUST 52 MPH NW IN 2008 [TSTM]

RECORDS FOR AUGUST 4
HIGH 95F IN 1928
LOW 48F IN 1900
PRECIP 1.68 INS IN 1983
PEAK GUST 48 MPH SW IN 1974

TODAY’S REPORT PREPARED BY: Jonathan O’Brien