Sunday, May 24, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 24, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY CONDITIONS CONTINUE TODAY WITH TEMPERATURES
IN THE 80’S

The low temperature of 50F this morning got us off
to a warmer start than yesterday and clear skies have
allowed temperatures to climb quickly this morning.

Winds are gusting close to 30 mph this morning and
combined with the high temperatures and low humidities
to create an elevated risk of brush fires and one fire
did start 2-3 miles Northeast of the observatory.

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus N-NE
Temperature: 58F; Dew Point: 36F; Wind: WSW at 09 kts
Sea-level pressure: 30.28 ins. Hg, steady
Visibility: 70 miles
6-hr Max temp: 58F
6-hr Min temp: 50F
24-hr precip: 0.00
BHO SA 1155 CLR 70 257/58/36/2409/028/ FEW AC N-E LGT DSNT
HZ 8/080 50002 10058 20050

10 A.M.
Weather: Clear, SKC
Temperature: 73F; Dew Point: 37F; Wind: WSW at 10 kts
Sea-level pressure: 30.27 ins. Hg, steady then falling
BHO SA 1455 CLR 55 252/73/37/2510/027/ SKC HAZY VSBY 35 ESE-SW
8/000 58005

1 P.M.
Weather: Clear, few cirrostratus SW-WNW, few Altocumulus NNW-N and overhead
forest fire 3 miles NE, thin smoke drifting NE-ESE
Temperature: 80F; Dew Point: 39F; Wind: WSW at 14 kts
Sea-level pressure: 30.22 ins. Hg, falling slightly
Visibility: 50 miles, light distant haze, except NE-E 10 mi smoke
6-Hr Max temp: 80F
6-Hr Min temp: 58F
BHO SA 1755 CLR 50 235/80/39/2414/022/  FEW CS SW-WNW FEW AC
NNW-N AND OVHD HAZY VSBY 10 NE-E FOREST FIRE 3 MI NE THN K
DRFTG NE-ESE 8/085 58017 10080 20058

SUMMARY FOR SATURDAY, MAY 23, 2015

TEMPERATURE (DEGREES F)
MAX…..64   NORMAL…..68
MIN…..40   NORMAL…..50
MEAN….52   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL……………………-7
TOTAL DEPARTURE FOR THE MONTH…………………..+91 [+4.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..13  DEPARTURE………..+6
TOTAL HEATING UNITS FOR THE MONTH………….130  DEPARTURE……….-92
TOTAL HEATING UNITS FOR THE SEASON………..6401  DEPARTURE………+145
TOTAL HEATING UNITS LAST SEASON TO DATE……6323  DIFFERENCE………+78

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….16   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE SEASON…………16   DEPARTURE……….+2
TOTAL COOLING UNITS LAST SEASON TO DATE…….13   DIFFERENCE………+3

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………28   WNW AT   9:08  A.M.
ASOS…………………..29   NW  AT   1:54  P.M.
DAVIS………………….29   WNW AT   12:28 P.M. RMY 32
FASTEST MILE FOR YESTERDAY………………..21   W   AT   11:43 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..22   W   AT   11:44 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….20   W   AT   11:44 A.M.
AVERAGE WIND SPEED AND DIRECTION………….
ASOS………………….13.5
DAVIS…………………12.2  W [270 deg.] * 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………..0.63  DEPARTURE…..-2.27
ASOS……………0.63
TOTAL PRECIPITATION FOR THE YEAR………..18.55  DEPARTURE…..-2.77
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 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/-8/0.00/0.0/354/42               21 NE  RMY 20
5/2  63/35/49/-4/0.00/0.0/668/79               20 S   RMY 20
5/3  74/44/59/+6/0.00/0.0/509/60               22 S   RMY 22
5/4  83/47/65/+11/0.00/0.0/783/92              39 SSW RMY 45
5/5  77/56/67/+13/0.03/0.0/222/26              29 SW  RMY N/A
5/6  74/54/64/+10/0.00/0.0/574/67              24 SSW RMY 25
5/7  84/52/68/+13/0.00/0.0/824/96              29 S   RMY 32
5/8  74/44/59/+4/0.00/0.0/809/94               27 NNE RMY 26
5/9  77/44/61/+6/0.00/0.0/509/59               30 S   RMY 32
5/10 88/60/74/+19/0.00/0.0/692/80              28 SSW RMY 30
5/11 84/48/66/+10/0.00/0.0/529/61              30 NE  RMY 31
5/12 84/47/66/+10/0.24/0.0/287/33              33 WNW RMY 37
5/13 67/47/57/+1/0.00/0.0/820/94               31 WNW RMY N/A
5/14 70/44/57/+0/0.00/0.0/…/..               22 NW  RMY 22
5/15 73/51/62/+5/0.00/0.0/…/..               20 WSW RMY 21
5/16 68/53/61/+4/T/0.0/…/..                  23 S   RMY 24
5/17 79/50/65/+8/T/0.0/…/..                  21 NE  RMY N/A
5/18 62/48/55/-3/…./0.0/…/..               25 NE  RMY N/A
5/19 63/50/57/-1/0.36/0.0/…/..               24 S   RMY 26
5/20 66/46/56/-2/0.00/0.0/…/..               32 WNW RMY 37
5/21 66/43/55/-4/…./0.0/…/..               24 S   RMY 24
5/22 73/49/61/+2/T/0.0/…/..                  32 NW  RMY 36
5/23 64/40/52/-7/0.00/0.0/…/..               28 WNW RMY 32

5/24 low since midnight is 50F; normal low is now 50F

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 24
HIGH 92F IN 1964
LOW 35F IN 1956
PRECIP 2.13 INS IN 1951
PEAK GUST 54 MPH NNE IN 2005

RECORDS FOR MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)

TODAY’S REPORT PREPARED BY: Robert Millette