Thursday, August 20, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 20, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

WEDNESDAY’S HEAT BRINGS AUGUST TEMPERATURES
NOW 2.7 DEGREES WARMER THAN NORMAL

Warmer than normal temperatures have continued, with
yesterday’s maximum temperature reaching the 87F mark.
Overnight, temperatures dipped to 70F, with fog slowly
dissipating in the distance this morning.

Winds from the SE have kept temperatures slightly cooler than
previous days, with a maximum of 85F by the 1:00 PM EST observation.
Today’s Observations:

7 A.M.
Weather: Clear, few stratus fractus in all directions,
few stratocumulus lenticularis SSW-N
Temperature: 74F; Dew Point: 69F; Wind: SE at 7 kts
Sea-level pressure: 30.11 ins. Hg, about the same as 3 hours ago
Visibility: 20 miles, hazy, thin fog
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 20 198/74/69/1407/011/ FEW STFRA ALQDS FEW SCSL
SSW-N THN FG ALQDS HAZY/ 8/700 55000 10074 20070

10 A.M.
Weather: Broken cumulus, few stratus fractus distant N-NNE
Temperature: 79F; Dew Point 68F; Wind: ESE at 8 kts,
Sea-level pressure: 30.13 ins. Hg, rising, then more quickly
Visibility: 40 miles, hazy
BHO SA 1455 E12 BKN 40 202/79/68/1308/013/ FEW STFRA N-NNE HAZY/
8/700 53004

1 P.M.
Weather: Broken cumulus, few stratus fractus distant N-NNE
Temperature: 84F; Dew Point: 65F; Wind: S at 8 kts
Sea-level pressure: 30.10 ins. Hg, rising, then falling and lower
Visibility: 40 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 74F
BHO SA 1755 E4 BKN 40 193/84/65/1708/010/ FEW STFRA DSNT N-NNE HAZY/
8/100 58009 10085 20074
SUMMARY FOR WEDNESDAY, AUGUST 19, 2015

TEMPERATURE (DEGREES F)
MAX…..87   NORMAL…..79
MIN…..69   NORMAL…..62
MEAN….78   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL……………………+8
TOTAL DEPARTURE FOR THE MONTH…………………..+52  [+2.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..13   DEPARTURE……….+7
TOTAL COOLING UNITS FOR THE MONTH………….174   DEPARTURE………+47
TOTAL COOLING UNITS FOR THE SEASON…………568   DEPARTURE………+90
TOTAL COOLING UNITS LAST SEASON TO DATE…….424   DIFFERENCE…….+144

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 S   AT   4:23 P.M.
ASOS……………………25 S   AT   4:23 P.M.
DAVIS…………………..23 S   AT   4:23 P.M. RMY 24
FASTEST MILE FOR YESTERDAY…………………16 SSW AT   5:17 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 S   AT   4:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 S   AT   4:24 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.0 SW
ASOS…………………..11.0
DAVIS………………….10.3 SSW [214 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.13
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.40  DEPARTURE…..-0.22
ASOS…………..2.42
TOTAL PRECIPITATION FOR THE YEAR………..29.76  DEPARTURE…..-3.85
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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  88/68/78/+6/0.06/729/84               28 WNW RMY N/A
8/2  86/62/74/+2/0.00/865/100              24 SW  RMY N/A
8/3  89/68/79/+7/0.00/690/80               31 S   RMY N/A
8/4  86/66/76/+4/0.31/422/49               45 W   RMY 50  TSTM
8/5  84/64/74/+2/0.00/765/89               28 WNW RMY 27
8/6  80/59/70/-2/0.00/685/80               22 W   RMY 21
8/7  78/61/70/-2/0.00/845/99               20 ESE RMY 18
8/8  77/58/68/-4/0.00/741/87               18 E   RMY N/A
8/9  72/59/66/-6/T/458/54                  27 NNE RMY 26
8/10 84/58/71/0/0.00/…/..                28 S   RMY N/A
8/11 70/63/67/-4/0.52/000/00               32 SSE RMY 35
8/12 83/65/74/+3/0.00/766/91               22 W   RMY 20
8/13 83/62/73/+2/0.00/832/99               18 WNW RMY 18
8/14 86/63/75/+4/0.00/837/100              21 S   RMY 23
8/15 91/66/79/+8/…./…/..               38 W   RMY 41  TSTM
8/16 87/65/76/+5/…./…/..               16 W   RMY N/A
8/17 90/70/80/+9/0.00/…/..               17 W   RMY 18
8/18 92/70/91/+10/0.27/…/..              31 W   RMY 32  TSTM
8/19 87/69/78/+8/0.00/…/..               23 S   RMY 24

8/20 low since midnight is 70F; normal low is now 62F

DAILY RECORDS FOR AUGUST 2015
None so far.

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

RECORDS FOR AUGUST 20
HIGH 93F IN 1937
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983

RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004

TODAY’S REPORT PREPARED BY: Brian Fitzgerald