Thursday, May 22, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 22, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

A FOGGY MORNING GIVES WAY TO AFTERNOON SHOWERS.

Dense coastal fog was visible from the top of Great Blue Hill
through most of this morning, especially in the heart of Boston
where Logan International was reporting surface visibilities of
1/2 of a mile at times.

By mid day most coastal fog had burned off under increasingly
cloudy skies. Showers became visible in the distance by mid day
as well, finally culminating in light rain showers prior to and
during the 1:00 PM EST observation, only totaling 0.03 inches
until that point.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, thin overcast of cirrostratus,
dense fog below station NNW-ENE, few stratocumulus lower
than station E-NE, few altocumulus lenticularis distant SW-NNW
Temperature: 57F; Dew Point: 50F; Wind: SSW at 3 kts
Wind Speed: Light
Sea-level pressure: 29.93 ins. Hg, decreasing, then increasing,
and higher than 3 hours ago
Visibility: 20 miles, 8 miles NNW-ENE, thin fog in all
directions, dense fog below the station NNW-ENE
6-hr max temp: 57F
6-hr min temp: 51F
24-hr precip: 0.00
BHO SA 1155 E90 BKN 200 –OVC 20 136/57/50/E2103/993/
DNS FG BLOW STA NNW-ENE VSBY NNW-ENE 8 MI FEW SC LWR E-NW
FEW ACSL DSNT SW-NNW THN FG ALQDS WND LGT/ 8/636 53002 10057 20051

10 A.M.
Weather: Broken stratocumulus, overcast altostratus,
fog distant below station NNE-ENE, thin spots in overcast overhead
Temperature: 65F; Dew Point: 52F; Wind: SSE at 6 kts,
Wind Speed: Light
Sea-level pressure: 29.92 ins. Hg, increasing, then decreasing
and lower
Visibility: 25 miles, 11 miles NNE-ENE obscured by fog below
station and distant, thin fog E-N
BHO SA 1455 E35 BKN 190 OVC 25 132/65/52/E1506/992/
FG BLOW STA DSNT NNE-ENE VSBY NNE-ENE 11 MI THN SPTS OVHD
THN FG E-N WND LGT/ 8/51/ 58004

1 P.M.
Weather: Light rain showers, broken stratocumulus,
overcast nimbostratus, few stratus fractus in all directions
Temperature: 60F; Dew Point: 56F; Wind: NNW at 3 kts,
Wind: Light
Sea-level pressure: 29.91 ins. Hg, decreasing, then increasing,
but lower than 3 hours ago
Visibility: 10 miles, 5 miles NNE and SE, obscured by rain showers
6-hr max temp: 67F
6-hr min temp: 57F
6-hr precip: 0.03 inches
BHO SA 1755 E40 BKN 50 OVC 10R- 129/60/56/E3303/991/
RWB24 FEW STFRA ALQDS VSBY NNE AND SE 5 MI WND LGT/
8/72/ 55003 ASOS 60002 MANUAL 60003 10067 20057

WEATHER SUMMARY FOR WEDNESDAY, MAY 21, 2014

TEMPERATURE (DEGREES F)
MAX…..71    NORMAL…..68
MIN…..51    NORMAL…..49
MEAN….61    NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL……………………..+2
TOTAL DEPARTURE FOR THE MONTH…………………….+72 [+3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4  DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH………….136  DEPARTURE………-72
TOTAL HEATING UNITS FOR THE SEASON………..6307  DEPARTURE………+65
TOTAL HEATING UNITS LAST SEASON TO DATE……5672  DIFFERENCE…….+635

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….13   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE SEASON…………13   DEPARTURE……….+1
TOTAL COOLING UNITS LAST SEASON TO DATE……..6   DIFFERENCE………+7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………18  ESE  AT  3:41 P.M
ASOS…………………..20  ESE  AT  3:44 P.M.
DAVIS………………….19  ESE  AT  3:41 P.M. RMY 20
FASTEST MILE FOR YESTERDAY………………..15  ESE  AT  3:55 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..15  ESE  AT  3:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….15  E    AT  3:55 P.M.
AVERAGE WIND SPEED AND DIRECTION…………. 8.5
ASOS…………………..9.1
DAVIS………………….7.8 E [87 deg] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE………….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.08  DEPARTURE………….-0.53
ASOS…………..2.09
TOTAL PRECIPITATION FOR THE YEAR……….21.20  DEPARTURE………….+0.04
ASOS………….21.62

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…………..85.6  DEPARTURE………….+22.9

PRELIMINARY CLIMATE SUMMARY FOR MAY 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  64/43/54/+1/0.49/0.0/093/11          32 SSE RMY 36
5/2  68/51/60/+7/T/0.0/457/54             28 W   RMY 29
5/3  66/48/57/+4/0.00/0.0/332/39          21 SW  RMY N/A
5/4  60/47/54/0/0.01/0.0/400/47           51 WNW RMY 54
5/5  64/46/55/+1/T/0.0/592/70             30 NW  RMY 32
5/6  63/42/53/-1/T/0.0/506/59             30 NW  RMY 30
5/7  64/42/55/0/0.00/0.0/850/99           21 WNW RMY 23
5/8  69/48/59/+4/0.00/0.0/612/71          17 SSW RMY 19
5/9  57/51/54/-1/0.05/0.0/000/00          21 S   RMY N/A
5/10 78/57/68/+13/0.10/0.0/043/05         33 S   RMY 37
5/11 79/58/69/+13/0.01/0.0/746/86         30 W   RMY N/A
5/12 85/49/67/+11/0.00/0.0/792/91         39 NE  RMY 42
5/13 54/42/48/-8/0.00/0.0/113/13          32 NE  RMY N/A
5/14 73/42/58/+1/T/ 0.0/613/70            22 S   RMY 24
5/15 77/57/67/+10/T/0.0/140/16            27 S   RMY 33
5/16 73/60/67/+10/…./0.0/…/..         36 S   RMY 41
5/17 74/52/63/+6/…./0.0/…/..          36 SSE RMY N/A
5/18 67/47/57/-1/0.00/0.0/…/..          20 NW  RMY N/A
5/19 65/48/56/-2/…./0.0/…/..          35 NNW RMY 38
5/20 71/48/60/+2/0.00/0.0/…/..          25 NNW RMY 26
5/21 71/51/61/+2/0.00/0.0/…/..          18 ESE RMY 20

5/22  morning low temp: 51F; the normal low is now 50F

DAILY RECORDS FOR MAY 2014
None so far.

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

RECORDS FOR MAY 22
HIGH 93F IN 1911
LOW 35F IN 1907
PRECIP 3.75 INCHES IN 1920
PEAK GUST 49e MPH SSW IN 1947

RECORDS FOR MAY 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 0.97 INS IN 1979
PEAK GUST 49e MPH W IN 1945

TODAY’S REPORT PREPARED BY: Brian Fitzgerald