Wednesday, July 8, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 8, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SHOWERS ENTER THE REGION, FLASH FLOOD WATCH
POSTED FOR THIS AFTERNOON

Nearly oppressive humidity has lingered in the region,
culminating in today’s very sticky, damp conditions. Haze,
a thin layer of smoke and showers have reduced visibility
this morning to 10 miles or less. Additionally, a brief
shower just after 8:00 AM EST dropped a trace of new rain.

By the 1:00 PM EST observation sunshine was plentiful
with cumulus begin to build throughout the sky. A few
moderate cumulus were observed just the WNW-NNE, with
haze limiting visibility to 10 miles. A maximum temperature
of 86F had been recorded by this time as well.
PRELIMINARY STATS FOR JUNE 2015

TEMPERATURE, Deg. F
Avg. Max. 72.9 [-2.1] Avg. Min. 55.8 [-1.3] Mean      64.4 [-1.7] Corrected mean: 63.9
Max. for month: 86 on 6/12
Min. for month: 44 on 6/2 and 6/3

HEATING DEGREE DAYS
Total heating units: 100 [+27]**
Total for the season: 6504 [+128]**
Total for last season: 6422

** CORRECTIONS MADE

COOLING DEGREE DAYS
Total cooling units: 89 [-16] Total for the season: 138 [+9] Total for last season: 109

PRECIPITATION, Inches
Total: 4.90 [+0.59] Greatest in 24 hrs: 1.27 from 6/27-28

WIND, mph
Avg. uncorrected wind speed: 10.4
Avg. corrected wind speed: 10.9
Prevailing wind direction: S @ 12%
Peak gust and direction: 41 SSW on the 8th

SUNSHINE:
Astronomical total minutes:  12,941 out of 27,416 possible, or 47%
Campbell-Stokes card minutes: 12,450 out of 26,376 possible, or 47%

Today’s Observations:

7 A.M.
Weather: Scattered altostratus, broken altocumulus,
few altocumulus lenticularis distant NW
Temperature: 76F; Dew Point: 70F; Wind: SW at 13 kts
Sea-level pressure: 29.92 ins. Hg, slightly higher
Visibility: 9 miles, thin smoke layer, hazy
6-hr Max temp: 76F
6-hr Min temp: 70F
24-hr precip: 0.02 inches
BHO SA 1155 130 SCT E200 BKN 9 131/76/70/2213/992/ FEW ACSL DSNT NW
THN K ALQDS HAZY/ 8/070 51003 ASOS 70001 MANUAL 70002 10076 20070

10 A.M.
Weather: Broken altostratus, broken altocumulus
Temperature: 80F; Dew Point: 72F; Wind: WSW at 11G19 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more quickly
Visibility: 9 miles, thin smoke in all direction, hazy
3-hr precip: Trace
BHO SA 1455 E110 BKN E160 BKN 9 129/80/72/2511G19/991/
THN K ALQDS HAZY/ 8/070 58002 MANUAL 6000/

1 P.M.
Weather: Scattered cumulus, broken altocumulus, broken
cirrocumulus, few moderate cumulus WNW-NNE
Temperature: 86F; Dew Point: 73F; Wind: W at 8G17 kts,
Sea-level pressure: 29.90 ins. Hg, falling, then more quickly
Visibility: 10 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 76F
6-hr precip: Trace
BHO SA 1755 40 SCT E150 BKN 220 BKN 10 126/86/73/2608G17/990/
FEW MDT CU WNW-NNE HAZY/ 8/239 58003 MANUAL 6000/ 10086 20076
SUMMARY FOR TUESDAY, JULY 7, 2015

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..80
MIN…..65   NORMAL…..62
MEAN….75   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………………+4
TOTAL DEPARTURE FOR THE MONTH……………………+3 [+0.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE MONTH…………..43   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE SEASON…………181   DEPARTURE……….+8
TOTAL COOLING UNITS LAST SEASON TO DATE…….169   DIFFERENCE………12

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….35 S   AT   4:30 P.M.
ASOS……………………39 S   AT   4:30 P.M.
DAVIS…………………..36 S   AT   4:29 P.M.  RMY 40
FASTEST MILE FOR YESTERDAY…………………29 SSW AT   4:28 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………30 SSW AT   4:28 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..29 SSW AT   4:27 P.M.
AVERAGE WIND SPEED AND DIRECTION…………. .13.3 S
ASOS……………………13.4
DAVIS…………………..11.8 S [189 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.02  DEPARTURE…..-0.09
ASOS……………0.01
TOTAL PRECIPITATION FOR THE MONTH………..0.61  DEPARTURE…..-0.15
ASOS……………0.61
TOTAL PRECIPITATION FOR THE YEAR………. 24.88  DEPARTURE…..-2.72
ASOS……………N/A ***

*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/0.80/000/00 **           28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  67/52/60/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A
6/11 85/61/73/+8/0.00/594/65               29 SSW RMY 32
6/12 86/65/76/+11/0.00/522/57              26 S   RMY 29
6/13 83/67/75/+10/T/586/64                 24 N   RMY 27
6/14 75/61/68/+2/0.00/641/70               21 SSE RMY 21
6/15 61/52/57/-9/0.60/000/00               25 SE  RMY 26
6/16 73/56/65/-1/T/009/01                  18 NW  RMY N/A
6/17 70/57/64/-3/0.00/605/66               28 NE  RMY 28
6/18 76/54/65/-2/0.00/669/73               22 S   RMY 26
6/19 84/60/72/+5/T/642/70                  24 SSW RMY 22
6/20 75/56/66/-2/0.05/559/61               23 SSE RMY N/A
6/21 76/60/68/0/1.14/202/22                26 S   RMY 29
6/22 83/63/73/+5/0.00/770/84               20 WNW RMY 19
6/23 85/67/76/+8/0.01/284/31               36 S   RMY 38 TSTM **
6/24 82/62/72/+3/0.00/899/98               25 WNW RMY 27
6/25 80/60/70/+1/0.00/605/66               21 W   RMY N/A
6/26 72/58/65/-4/0.01/540/59               23 NNE RMY 21
6/27 73/56/65/-4/0.24/202/22               32 ESE RMY N/A
6/28 59/50/55/-15/1.27/000/00              39 ENE RMY 38
6/29 71/50/61/-9/0.00/110/12               17 SSW RMY 18
6/30 81/60/71/+1/T/741/81                  21 S   RMY N/A

** CORRECTION MADE

7/1  80/63/72/+2/0.59/…/..               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/…/..               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/…/..               17 SSW RMY 17
7/4  74/61/68/-3/T/…/..                  16 S   RMY N/A
7/5  82/58/70/-1/0.00/…/..               20 WSW RMY 20
7/6  85/64/75/+4/0.00/…/..               20 S   RMY 21
7/7  84/65/75/+4/0.02/…/..               35 S   RMY 40

7/8 low since midnight is 70F; normal low is now 63F

DAILY RECORDS FOR JUNE AND JULY 2015

6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004

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

RECORDS FOR JULY 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992

TODAY’S REPORT PREPARED BY: Brian Fitzgerald