Wednesday, September 3, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 3, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

THUNDERSTORMS ROLL THROUGH YESTERDAY AFTERNOON,
SIDE-SKIRTING BLUE HILL

Yesterday’s maximum of 91F represented only the second
day this year with a reading of 90F or above, and tied
July 3rd for the hottest day of the year. Dew point readings
which reached as high as 73F also represented some of the
highest of 2014 as well.

Thunderstorms that developed to our west late Tuesday
afternoon stayed mostly to our north, though thunder
was reported at the station from 1:02 PM EST until ending
at 2:52 PM EST. No precipitation was reported from this event.

AUGUST 2014 PRELIMINARY STATS
[Departures are relative to the 1981-2010 averages]

TEMPERATURE [deg. F] Av. Max. 78.8
Av. Min. 59.7
Mean     69.3 [-1.2] 24-hour corr. mean: 68.6
Max. temp. for month: 89 on 26th and 27th
Min. temp. for month: 54 on 19th and 29th
Total heating degree day units: 2    [-14] Total cooling degree day units: 142  [-44] Total seasonal cooling   units: 479  [-58] Season [1/1 thru 8/31]

PRECIPITATION [ins.] Total: 1.55 [-2.48] Greatest one calendar day: 1.09 [13th] Greatest in 24 hours 1.09 [13th]

WIND
Av. wind speed:       9.4  MPH
Av. corr. wind speed: 10.1 MPH
Prevailing direction: SSW @ 14% possible

SUNSHINE
Total astronomical minutes: 17,908 of a possible 25,751, or 70%
Total Campbell Stokes card minutes: 17,238 of a possible 24,780, or 70%

The final (sun card) sunshine hours for August ranks as the 6th highest on record.

BHO Sunniest Augusts, 1886-2014

1) 303.7 hours, 1971  (74%)
2) 303.0 hours, 1969  (73%)
3) 298.1 hours, 1932  (72%)
4) 296.7 hours, 1970  (72%)
5) 296.6 hours, 1995  (72%)
6) 287.3 hours, 2014  (70%)
7) 286.1 hours, 1941  (69%)

The total (sun card) sunshine hours for Summer ranks as the 4th highest on record.

BHO Sunniest Summers (Jun-Aug), 1886-2014

1) 920.1 hours, 1971  (71%)
2) 876.0 hours, 1965  (68%)
3) 863.8 hours, 1966  (67%)
4) 862.5 hours, 2014  (66%)
5) 861.7 hours, 1909  (66%)

Today’s Observations:

7 A.M.
Weather: Broken cirrus, few cumulus distant offshore E,
few cirrocumulus lenticularis distant SE-S
Temperature: 70F; Dew Point: 60F; Wind: WNW at 10G19 kts,
Sea-level pressure: 29.91 ins. Hg, increasing, then more slowly
Visibility: 80 miles
6-hr max temp: 74F
6-hr min temp: 67F
24-hr precip: 0.00
BHO SA 1155 E250 BKN 80 127/70/60/2910G19/991/
FEW CU DSNT OFFSHR E FEW CCSL DSNT SE-S/ 8/102 51037 10074 20067

10 A.M.
Weather: Few cumulus distant WSW-NE, broken cirrocumulus,
broken cirrus
Temperature: 74F; Dew Point: 58F; Wind: WNW at 9G15 kts,
Sea-level pressure: 29.96 ins. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 E200 BKN 250 BKN 70 147/74/58/3009G15/996/
FEW CU DSNT WSW-NE/ 8/109 51020

1 P.M.
Weather: Few cumulus distant in all directions,
scattered cirrus
Temperature: 80F; Dew Point: 57F; Wind: WNW at 13G20 kts,
Sea-level pressure: 29.98 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr max. temp: 82F
6-hr min. temp: 69F
BHO SA 1755 E250 SCT 70 153/80/57/2913G20/998/
FEW CU DSNT ALQDS/ 8/102 53006 10082 20069

WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 2, 2014

TEMPERATURE (DEGREES F)
MAX…..91    NORMAL…..76
MIN…..70    NORMAL…..59
MEAN….81    NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL……………………+13
TOTAL DEPARTURE FOR THE MONTH……………………+24 [+11.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………….16   DEPARTURE……….+12
TOTAL COOLING UNITS FOR THE MONTH………….30   DEPARTURE……….+22
TOTAL COOLING UNITS FOR THE SEASON………..509   DEPARTURE……….-36
TOTAL COOLING UNITS LAST SEASON TO DATE……655   DIFFERENCE……..-146

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………24 S   AT  4:07 P.M.*
ASOS…………………..28 SW  AT  4:03 P.M.
DAVIS………………….28 SW  AT  2:25 P.M. RMY 27
FASTEST MILE FOR YESTERDAY………………..22 S   AT  4:07 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………..22 SSW AT  4:08 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….21 SSW AT  4:06 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.8 S
ASOS…………………..11.2
DAVIS………………….9.9 SSW [208 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……….-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR SEPTEMBER……….0.00  DEPARTURE……….-0.22
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….31.18  DEPARTURE……….-4.06
ASOS………….31.43

PRELIMINARY CLIMATE SUMMARY FOR AUGUST & SEPTEMBER 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

8/1  86/63/75/+3/0.00/598/69              25 S   RMY 29
8/2  68/59/64/-8/0.11/009/01              21 ESE RMY 22
8/3  71/60/66/-6/0.01/104/12              12 SE  RMY 12
8/4  83/64/74/+2/0.00/550/64              20 S   RMY 21
8/5  87/66/77/+5/0.00/798/93              17 S   RMY 19
8/6  79/64/72/0/0.07/462/54               23 WNW RMY 25
8/7  79/58/69/-3/T/589/69                 22 NW  RMY 24 TSTM
8/8  82/55/69/-3/0.00/817/96              20 WNW RMY 20
8/9  82/60/71/-1/0.00/730/86              16 WNW RMY 17
8/10 84/63/74/+3/0.00/770/91              15 W   RMY N/A
8/11 85/63/74/+3/0.00/667/79              25 S   RMY 29
8/12 81/64/73/+2/0.00/387/46              25 SSE RMY N/A
8/13 69/61/65/-6/1.09/000/00              35 ESE RMY 37
8/14 73/57/65/-6/0.00/828/99              27 W   RMY 29
8/15 74/56/65/-6/0.09/459/55              23 W   RMY 23 TSTM
8/16 76/56/66/-5/0.00/640/77              24 SW  RMY 27
8/17 78/60/69/-2/0.01/555/67              21 WNW RMY 23
8/18 77/56/67/-4/0.00/776/94              23 WNW RMY 25
8/19 78/54/66/-4/0.00/816/99              17 WNW RMY 17
8/20 78/58/68/-2/0.00/813/99              15 NE  RMY 15
8/21 76/58/67/-3/T/434/53                 16 ENE RMY 17
8/22 71/60/66/-4/0.07/057/07              17 NE  RMY 19
8/23 71/58/65/-5/0.00/618/76              22 ENE RMY 25
8/24 78/58/68/-2/0.00/811/100             16 ENE RMY N/A
8/25 85/63/74/+5/0.00/808/100             16 NW  RMY 17
8/26 89/62/70/+7/0.00/781/97              20 SSW RMY 23
8/27 89/64/77/+8/0.03/731/91              23 SW  RMY 25
8/28 80/59/70/+1/0.00/640/80              25 NW  RMY 28
8/29 73/54/64/-5/0.00/789/99              18 E   RMY 21
8/30 77/55/66/-2/0.00/723/91              23 S   RMY 28
8/31 83/63/73/+5/0.07/150/19              26 SSW RMY 31

9/1  88/69/79/+11/0.00/…/..             16 W   RMY 19
9/2  91/70/81/+13/0.00/…/..             24 S   RMY 27

9/3 morning low temp: 67F; normal low now 59F

DAILY RECORDS FOR AUGUST 2014:
None so far.

DAILY RECORDS FOR SEPTEMBER 2014:
None so far.

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

RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1983
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)

RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966

TODAY’S REPORT PREPARED BY: Brian Fitzgerald / Mike Iacono