Thursday, April 16, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 16, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY CONDITIONS CONTINUE, DEW POINTS REMAIN IN THE
TEENS TODAY

Clear and very dry conditions persisted into Thursday, and
temperatures tried to rebound from an overnight low of 42F.
Gusty NNW winds from yesterday calmed overnight, and shifted
largely to the East, keeping temperatures suppressed in
the 50s thanks to a very cold ocean.

By the 1:00 PM EST observation clear skies remained, with
broken cirrus overhead. Light haze was visible in most
directions, limiting visibility to 70 miles in all directions.
A maximum of 63F was reached by the 1:00 PM EST reading.

—————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus distant SSE-W
Temperature: 49F; Dew Point: 20F; Wind: estimated ENE at 3 kts,
Wind Speed: Light
Sea-level pressure: 30.49 ins. Hg, increasing then more slowly
Visibility: 70 miles, light distant haze
6-hr Max temp: 49F
6-hr Min temp: 42F
24–hour precip: None
BHO SA 1155 CLR 70 325/49/20/E0603/049/
FEW CI DSNT SSE-W LGT DSNT HZ ALQDS WND LGT/ 8/001 51018 10049 20042

10 A.M.
Weather: Scattered cirrus
Temperature: 53F; Dew Point: 14F; Wind: estimatd E at 5 kts,
Wind Speed and Direction: Light and Variable
Sea-level pressure: 30.49 ins. Hg, about the same
Visibility: 70 miles, light distant haze
BHO SA 1455 250 SCT 70 325/53/14/E0905/049/
LGT DSNT HZ ALQDS WND LGT AND VRB/ 8/001 50000

1 P.M.
Weather: Broken cirrus
Temperature: 63F; Dew Point: 20F; Wind: estimated S at 6 kts
Wind Speed: Light
Sea-level pressure: 30.42 ins. Hg, falling then more quickly
Visibility: 70 miles, light distant haze
6-hr Max temp: 63F
6-hr Min temp: 49F
BHO SA 1755 E250 BKN 70 302/63/20/E1806/042/
LGT DSNT HZ ALQDS WND LGT/ 8/001 58023 10063 20049

SUMMARY FOR WEDNESDAY, APRIL 15, 2015

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..56
MIN…..45   NORMAL…..38
MEAN….56   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL…………………..+9
TOTAL DEPARTURE FOR THE MONTH………………….+18 [+1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………9  DEPARTURE………..-9
TOTAL HEATING UNITS FOR THE MONTH………….300  DEPARTURE……….-19
TOTAL HEATING UNITS FOR THE SEASON………..6043  DEPARTURE………+241
TOTAL HEATING UNITS LAST SEASON TO DATE……5862  DIFFERENCE……..+181

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………32 NW  AT   3:06 P.M.
ASOS…………………..35 NW  AT   3:05 P.M.
DAVIS………………….32 NNW AT   3:05 P.M. RMY 33
FASTEST MILE FOR YESTERDAY………………..26 NW  AT   3:04 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………..25 NW  AT   3:05 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….24 NW  AT   3:06 P.M.
AVERAGE WIND SPEED AND DIRECTION…………13.0 NNW
ASOS…………………13.8
DAVIS………………..10.8 NNW [327 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.15
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..1.48  DEPARTURE…..-1.03
ASOS……………1.43
TOTAL PRECIPITATION FOR THE YEAR………..16.07  DEPARTURE…..-0.31
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…..-2.2
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.9

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 low since midnight is 42F 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 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 73 MPH E IN 2007

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

TODAY’S REPORT PREPARED BY:  Brian Fitzgerald