Friday, April 17, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 17, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SHOWERS MOVE THROUGH THIS MORNING, BRINGING 0.15 INCHES
OF NEW RAIN

Rain showers began this morning prior to the 7:00 AM EST
observation, totaling 0.11 inches of new rain by that time.
By the 10:00 PM EST observation, the heaviest lines of
precipitation had passed, adding another 0.04 inches by that
time.

By the 1:00 PM EST observation precipitation looked like it
was all wrapped up for the day, with a total of 0.16 inches
falling by the last observation of the day. Skies were still
overcast with potentially some peaks of sun in the distance.
A maximum of 57F was recorded as winds had shifted to the
WSW.
—————————————————–

Today’s Observations:

7 A.M.
Weather: Light rain, overcast nimbostratus,
few stratus fractus distant WSW-NE
Temperature: 48F; Dew Point: 46F; Wind: SSW at 18 kts,
Peak Wind: 26 knots SSW @ 6:43 AM EST
Sea-level pressure: 30.08 ins. Hg, decreasing, then more quickly
Visibility: 20 miles, except 15 miles SE-SW, obscured by
light rain
6-hr Max temp: 49F
6-hr Min temp: 45F
24–hour precip: 0.11 inches
BHO SA 1155 E70 OVC 20R- 185/48/46/2018/008/
VSBY SE-SW 15 MI FEW STFRA DSNT WSW-NE PK WND 2026/43/
8/72/ 58010 ASOS 60011 70011 MANUAL 70011 10049 20045

10 A.M.
Weather: Rain ends 9:49 AM EST, overcast stratus
Temperature: 53F; Dew Point: 52F; Wind: SSW at 16G22 kts,
Sea-level pressure: 30.01 ins. Hg, falling, then more slowly
Visibility: 20 miles, thin fog
3-hr precip: 0.04 inches
BHO SA 1455 E10 BKN 20 161/53/52/2116G22/001/
R-E49 THN FG ALQDS/ 8/6// 56024 ASOS 60004 MANUAL 60004

1 P.M.
Weather: Broken stratocumulus, overcast stratus
Temperature: 57F; Dew Point: 52F; Wind: WSW at 11G18 kts
Sea-level pressure: 29.94 ins. Hg, falling then more quickly
Visibility: 25 miles, thin fog
3-hr precip: 0.01 inches
6-hr precip: 0.05 inches
6-hr Max temp: 57F
6-hr Min temp: 48F
BHO SA 1755 E12 BKN 21 OVC 25 139/57/52/2411G18/994/
THN FG ALQDS/ 8/6// 58022 ASOS 60005 MANUAL 60005 10057 20048

SUMMARY FOR THURSDAY, APRIL 16, 2015

TEMPERATURE (DEGREES F)
MAX…..64   NORMAL…..56
MIN…..42   NORMAL…..38
MEAN….53   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL…………………..+6
TOTAL DEPARTURE FOR THE MONTH………………….+24 [+1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12  DEPARTURE………..-6
TOTAL HEATING UNITS FOR THE MONTH………….312  DEPARTURE……….-25
TOTAL HEATING UNITS FOR THE SEASON………..6055  DEPARTURE………+235
TOTAL HEATING UNITS LAST SEASON TO DATE……5891  DIFFERENCE……..+164

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………31 S   AT   5:23 P.M.*
ASOS…………………..32 S   AT   5:24 P.M.
DAVIS………………….31 S   AT   4:59 P.M. RMY 32
FASTEST MILE FOR YESTERDAY………………..26 S   AT   5:23 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..24 S   AT   5:29 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….24 SSW AT   5:00 P.M.
AVERAGE WIND SPEED AND DIRECTION…………10.8 SSW
ASOS…………………10.5
DAVIS…………………9.5 S [189 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.11  DEPARTURE…..-0.04
ASOS……………0.11
TOTAL PRECIPITATION FOR THE MONTH………..1.59  DEPARTURE…..-1.07
ASOS……………1.54
TOTAL PRECIPITATION FOR THE YEAR………..16.18  DEPARTURE…..-0.35
ASOS…………….N/A ***
*** ASOS annual totals not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..0.0  DEPARTURE…..-0.1
TOTAL SNOWFALL FOR THE MONTH……………TRACE  DEPARTURE…..-2.3
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.8

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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

4/1  44/26/35/-6/0.00/0.0/748/98              30 WNW RMY 31
4/2  59/29/44/+3/T/0.0/375/49                 39 SSW RMY 43
4/3  56/47/52/+10/0.02/0.0/000/00             36 SW  RMY N/A
4/4  49/32/41/-1/…./0.0/501/65              54 NW  RMY 64
4/5  47/30/39/-4/…./0.0/464/60              40 W   RMY 45
4/6  48/33/41/-2/0/00/0.0/544/70              18 NE  RMY N/A
4/7  39/34/37/-6/…./0.0/000/00              21 NE  RMY N/A
4/8  41/32/37/-7/…./T/000/00                30 ENE RMY 32
4/9  35/32/34/-10/…./0.0/000/00             31 ENE RMY 32
4/10 53/35/44/-1/…./0.0/000/00              31 SW  RMY N/A
4/11 56/38/46/+1/0.00/0.0/…/..              39 WNW RMY 48
4/12 68/35/52/+7/0.00/0.0/…/..              23 WNW RMY 23
4/13 69/47/58/+12/0.00/0.0/…/..             35 SSW RMY N/A
4/14 65/51/58/+12/0.05/0.0/…/..             37 SSW RMY N/A
4/15 67/45/56/+9/0.00/0.0/…/..              32 NW  RMY 33
4/16 64/42/53/+6/0.00/0.0/…/..              31 S   RMY 21

4/17 low since midnight is 45F normal low is 38F

DAILY RECORDS FOR APRIL 2015

4/3 – NEW RECORD DAILY HIGH MINIMUM TEMPERATURE: 47F
surpasses the previous record of 46F in 1892

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

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 63 MPH ESE IN 2011

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 3.7 IN. IN 1965
PEAK GUST 59 MPH S IN 1982

TODAY’S REPORT PREPARED BY:  Brian Fitzgerald