Wednesday, May 6, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 6, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

UNSEASONABLE WARMTH CONTINUES, TEMPERATURES
HEAD INTO THE 70S AND BEYOND FOR THE FOURTH
CONSECUTIVE DAY

Skies cleared by mid afternoon yesterday, allowing the
mercury to climb up to a maximum temperature of 77F
just after 3:00 PM EST. Overnight, temperatures dipped
to a low of 54F. Yesterday’s average temperature of 67F
brought our first cooling degree days of the season.

By mid morning today skies were beginning to clear with
some altocumulus castellanus distant to the SE-SSW. Showers
were detected to the southwest early this morning; however,
no precipitation had been seen reaching the ground
from the station this morning.

PRELIMINARY STATS FOR APRIL 2015

TEMPERATURE, Deg. F
Avg. Max. 55.9 [+0.2] Avg. Min. 38.4 [+0.7] Mean      47.2 [+0.5] Corrected mean: 46.7
Max. for month: 69 on 4/13
Min. for month: 26 on 4/1

HEATING DEGREE DAYS
Total heating units: 528 [-23] Total for the season: 6271 [+236] Total for last season: 6171

PRECIPITATION, Inches
Total: 3.33 [-1.22] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: Trace [-3.0] Greatest in 24 hrs: Trace on 4/8

WIND, mph
Avg. uncorrected wind speed: 12.6
Avg. corrected wind speed: 13.0
Prevailing wind direction: NW @ 16%
Peak gust and direction: 54 NW on the 4th

SUNSHINE:
Astronomical total minutes:   12386 / 24083 or 51%
Campbell-Stokes card minutes: 11946 / 23250 or 51%

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, broken cirrus
Temperature: 60F; Dew Point: 37F; Wind: NE at 8 kts,
Sea-level pressure: 30.31 ins. Hg, rising then more slowly
Visibility: 70 miles, light distant haze
6-hr Max temp: 60F
6-hr Min temp: 54F
24-hr precip: 0.03 inches
BHO SA 1155 E140 BKN 250 BKN 70 264/60/37/0408/031/
LGT DSNT HZ ALQDS/ 8/032 51021 ASOS 70003 MANUAL 70003 10060 20054

10 A.M.
Weather: Broken cirrus, few altocumulus castellanus distant
SE-SSW
Temperature: 67F; Dew Point: 31F; Wind: E at 8 kts,
Sea-level pressure: 30.33 ins. Hg, rising, then more slowly
Visibility: 70 miles, light distant haze
BHO SA 1455 E250 BKN 70 2700/67/31/0808/021/033/
FEW ACC DSNT SE-SSW LGT DSNT HZ ALQDS/ 8/082 53006

SUMMARY FOR TUESDAY, MAY 5, 2015

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..63
MIN…..56   NORMAL…..45
MEAN….67   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL………………….+13
TOTAL DEPARTURE FOR THE MONTH………………….+18 [+3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0  DEPARTURE……….-12
TOTAL HEATING UNITS FOR THE MONTH…………..42  DEPARTURE……….-18
TOTAL HEATING UNITS FOR THE SEASON………..6313  DEPARTURE………+218
TOTAL HEATING UNITS LAST SEASON TO DATE……6216  DIFFERENCE………+97

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………29 SW    AT  12:15 A.M.
ASOS…………………..30 SW    AT  12:15 A.M.
DAVIS………………….29 SW    AT   MISSING  RMY N/A
FASTEST MILE FOR YESTERDAY………………..23 SW    AT  12:13 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..22 SW    AT   1:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….21 SSW   AT   MISSING
AVERAGE WIND SPEED AND DIRECTION…………9.2 WSW
ASOS…………………9.3
DAVIS………………..8.6 SW [223 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.03  DEPARTURE…..-0.10
ASOS……………0.03
TOTAL PRECIPITATION FOR THE MONTH………..0.03  DEPARTURE…..-0.59
ASOS……………0.03
TOTAL PRECIPITATION FOR THE YEAR………..17.95  DEPARTURE…..-1.09
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……0.0
TOTAL SNOWFALL FOR THE MONTH……………..0.0  DEPARTURE……0.0
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.1

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  TSTM
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/+9/0.00/0.0/786/98              32 NW  RMY 33
4/16 64/42/53/+6/0.00/0.0/765/95              31 S   RMY 21
4/17 64/45/55/+8/0.05/0.0/065/08              31 SSW RMY 32
4/18 64/43/54/+6/0.00/0.0/770/95              31 N   RMY 36
4/19 55/39/47/-1/0.00/0.0/724/89              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/…./0.0/417/51             30 SSE RMY N/A TSTM
4/22 67/45/56/+7/0.03/0.0/632/77              44 SSW RMY 52
4/23 49/34/42/-8/0.00/0/0/362/44              32 W   RMY N/A
4/24 50/32/41/-9/0.00/0.0/562/68              32 NW  RMY 36
4/25 56/30/43/-7/0.00/0.0/638/77              26 NW  RMY 29
4/26 54/39/47/-4/0.00/0.0/258/31              17 NW  RMY N/A
4/27 56/42/49/-2/…./0.0/125/15              30 NW  RMY N/A
4/28 63/39/51/-1/…./0.0/527/63              32 NW  RMY 35
4/29 58/46/52/+0/T/0.0/461/55                 24 ENE RMY 22
4/30 60/42/51/-1/0.00/0.0/320/38              21 NE  RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1 52/37/45/-8/0.00/0.0/…/..               21 NE  RMY 20
5/2 63/35/49/-4/0.00/0.0/…/..               20 S   RMY 20
5/3 74/44/59/+6/0.00/0.0/…/..               22 S   RMY 22
5/4 83/47/65/+11/0.00/0.0/…/..              39 SSW RMY 45
5/5 77/56/67/+13/0.03/0.0/…/..              29 SW  RMY N/A

5/6 Low since midnight is 54F; normal low now 45F

DAILY RECORDS FOR MAY 2015

NONE SO FAR

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

RECORDS FOR MAY 6
HIGH 90F IN 1930
LOW 29F IN 1891
PRECIP 1.04 INCHES IN 1890
SNOWFALL TRACE IN 1917,1996
PEAK GUST 65 MPH SSE IN 1989

RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Brian Fitzgerald