Tuesday, August 25, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 25, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

FOG THICKENS OVERNIGHT ONCE AGAIN, CLEARS MID MORNING,
COLD FRONT TO MOVE THROUGH TO REGION TODAY

Thick fog was present once again this morning, with visibility
cut to just 1/16 of a mile in all directions with only 100 feet
of vertical visibility. Fog began to lift before the 10:00 AM EST
observation with a few peaks of sunshine beginning to become
more frequent.

By the 1:00 PM EST observation sunshine was more plentiful with
mostly hazy conditions. Visibility had been reduced to just 30 miles
in all directions with a maximum temperature of 84F recorded.
Today’s Observations:

7 A.M.
Weather: Thick fog
Temperature: 68F; Dew Point: 68F; Wind: SE at 7 kts,
Sea-level pressure: 29.92 ins. Hg, rising, then steady
Visibility: 1/16th of a mile, obscured by thick fog
6-hr Max temp: 68F
6-hr Min temp: 67F
24-hr precip: 0.01 ins.
BHO SA 1155 W1 X 1/16F 131/68/68/1307/992/ 8//// 51003 MANUAL 70001
10068 20067

10 A.M.
Weather: Broken cumulus, broken altocumulus,
few cumulus fractus in all direction
Temperature: 77F; Dew Point 70F; Wind: estimated S at 6 kts,
Wind Speed: Light
Sea-level pressure: 29.93 ins. Hg, rising, then steady
Visibility: 30 miles, except 20 miles WSW-N, thin fog
3-hr precip: 0.00
BHO SA 1455 E4 BKN 70 BKN 30 137/77/70/E1906/993/ VSBY WSW-N 20 MI
FEW CUFRA ALQDS THN FG ALQDS WND LGT/ 8/730 51006

1 P.M.
Weather: Broken cumulus, broken dense cirrus,
few stratocumulus distant N-NE
Temperature: 83F; Dew Point: 69F; Wind: estimated S at 5 kts,
Wind Speed and Direction: Light and Variable
Sea-level pressure: 29.90 ins. Hg, falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 68F
6-hr Precip: 0.00 ins
BHO SA 1755 E50 BKN 250 BKN 30 124/83/69/E1805/990/ FEW SC DSNT N-NE
HAZY WND LGT AND VRB/ 8/802 56013 10084 20068
SUMMARY FOR MONDAY, AUGUST 24, 2015

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..78
MIN…..67   NORMAL…..61
MEAN….73   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL……………………+3
TOTAL DEPARTURE FOR THE MONTH…………………..+67  [+2.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8    DEPARTURE………+3
TOTAL COOLING UNITS FOR THE MONTH………….214   DEPARTURE………+60
TOTAL COOLING UNITS FOR THE SEASON…………608   DEPARTURE……..+103
TOTAL COOLING UNITS LAST SEASON TO DATE…….433   DIFFERENCE…….+175

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….18  SSW  AT   9:54 P.M.
ASOS……………………19  S    AT   9:54 P.M.
DAVIS…………………..18  SSW  AT   9:53 P.M. RMY 19
FASTEST MILE FOR YESTERDAY…………………13  SSW  AT   9:55 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14  S    AT   9:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13  SSW  AT   9:54 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..4.9 ENE
ASOS…………………..5.4
DAVIS………………….4.4 SE [131 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.01  DEPARTURE…..-0.11
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.90  DEPARTURE…..-0.35
ASOS…………..2.88
TOTAL PRECIPITATION FOR THE YEAR………..30.26  DEPARTURE…..-3.98
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 85/70/78/+8/0.00/…/..               22 ESE RMY 22
8/21 82/69/76/+6/0.31/…/..               21 S   RMY 23
8/22 73/66/70/0/T/…/..                   18 ENE RMY 16
8/23 70/66/68/-2/0.18/000/00               20 ENE RMY 18
8/24 78/67/73/+3/…./…/..               18 SSW RMY 19

8/25 low since midnight is 67F; normal low is now 61F

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 25
HIGH 93F IN 1947, 1948, 2007
LOW 41F IN 1940
PRECIP 2.69 INCHES IN 2010
PEAK GUST 60e MPH SSW IN 1941

RECORDS FOR AUGUST 26
HIGH 96F IN 1900, 1948
LOW 46F IN 1885
PRECIP 5.85 INCHES IN 1924
PEAK GUST 55e MPH NNW IN 1947

TODAY’S REPORT PREPARED BY: Brian Fitzgerald