Thursday, April 23, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 23, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

BRIEF SHOWER OVERNIGHT FOLLOWING VERY GUSTY WEDNESDAY

Winds that were already gusty by yesterday’s 1:00 PM EST
observation continued to intensify, reaching a peak gust
of 52 MPH from the S on both the ASOS and RMY wind sensors.
The fastest mile, coming at 7:29 PM EST, was registered
at 40 MPH from the SSW.

Showers moved through the area not long after winds began
to subside last evening, bringing 0.03 inches of new rain.

Clear to partly cloudy conditions were present this morning
following an overnight low of 37F. By the 1:00 PM EST observation
showers and virga were distant and visible in most directions,
though excellent visibilities of nearly 80 miles was also present.
Cold temperatures have persisted today, with a maximum reading
so far of 48F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrus,
few cumulus in all directions
Temperature: 42F; Dew Point: 31F; Wind: W at 14G20 kts,
Sea-level pressure: 29.63 ins. Hg, increasing, then more slowly
Visibility: 70 miles
6-hr Max temp: 42F
6-hr Min temp: 37F
24-hr precip: 0.03 inches
BHO SA 1155 100 SCT 200 SCT 70 033/42/31/2814G20/963/
FEW CU ALQDS/ 8/131 51012 ASOS 70003 MANUAL 70003 10042 20037

10 A.M.
Weather: Broken stratocumulus
Temperature: 44F; Dew Point: 26F; Wind: W at 14G20 kts,
Sea-level pressure: 29.61 ins. Hg, decreasing steadily
Visibility: 80 miles
BHO SA 1455 50 BKN 80 027/44/26/2614G20/961/ 8/500 57005

1 P.M.
Weather: Broken stratocumulus, showers and virga distant in all directions
Temperature: 46F; Dew Point: 20F; Wind: W at 14G20 kts,
Sea-level pressure: 29.61 ins. Hg, decreasing, then increasing but lowers
Visibility: 80 miles
6-hr Max temp: 48F
6-hr Min temp: 42F
BHO SA 1755 E70 BKN 80 026/46/20/2814G20/961/
SHWRS AND VIRGA DSNT ALQDS/ 8/500 55001 10048 20042

SUMMARY FOR WEDNESDAY, APRIL 22, 2015

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..58
MIN…..45   NORMAL…..40
MEAN….56   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL…………………..+7
TOTAL DEPARTURE FOR THE MONTH………………….+52 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………9  DEPARTURE………..-7
TOTAL HEATING UNITS FOR THE MONTH………….384  DEPARTURE……….-53
TOTAL HEATING UNITS FOR THE SEASON………..6127  DEPARTURE………+206
TOTAL HEATING UNITS LAST SEASON TO DATE……5921  DIFFERENCE……..+118

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………44 SSW   AT   5:45 P.M.
ASOS…………………..52 S     AT   2:28 P.M.
DAVIS………………….48 SSW   AT   5:43 P.M. RMY 52
FASTEST MILE FOR YESTERDAY………………..40 SSW   AT   7:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..38 SSW   AT   5:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….37 SSW   AT   7:31 P.M.
AVERAGE WIND SPEED AND DIRECTION………….17.3 S
ASOS………………….16.2
DAVIS…………………15.1 S [187 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.03  DEPARTURE…..-0.11
ASOS……………0.03
TOTAL PRECIPITATION FOR THE MONTH………..3.08  DEPARTURE…..-0.40
ASOS……………3.05
TOTAL PRECIPITATION FOR THE YEAR………..17.67  DEPARTURE…..+0.32
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…..-2.8
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.3

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/+1/0.00/0.0/744/94              39 WNW RMY 48
4/12 68/35/52/+7/0.00/0.0/762/96              23 WNW RMY 23
4/13 69/47/58/+12/0.00/0.0/764/96             35 SSW RMY N/A
4/14 65/51/58/+12/0.05/0.0/072/09             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 64/45/55/+8/0.05/0.0/…/..              31 SSW RMY 32
4/18 64/43/54/+6/0.00/0.0/…/..              31 N   RMY 36
4/19 55/39/47/-1/0.00/0.0/…/..              25 NNW RMY N/A
4/20 55/38/47/-2/…./0.0/000/00              36 SE  RMY 40
4/21 67/51/59/+10/…./0.0/…/..             30 SSE RMY N/A
4/22 67/45/56/+7/0.03/0.0/…/..              44 SSW RMY 52

4/23 low since midnight is 37F normal low is 41F

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 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 2.0 IN. IN 2012
PEAK GUST 64 MPH WNW IN 1962

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY’S REPORT PREPARED BY:  Brian Fitzgerald