Thursday, May 29, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 29, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

FOG AND NEAR-RECORD COLD DEPART WITH SUN AND COOL
TEMPERATURES TODAY

Fog, drizzle and unseasonable cold were the major headlines
yesterday for a day that seemed more March than May-like. The
24-hour maximum of 48F and minimum of 40F were the contributing
factors making yesterday 17 degrees below the daily average
30 year norm. A morning low of 39F this morning would have tied
the daily morning low for yesterday, however it could not beat
today’s record of 35F set back in 1902. Yesterday was also
just 2 degrees above the daily record low maximum as well.

Clear conditions have prevailed today with slightly cooler
than average temperatures. Cirrus fibratus and cirrostratus
fibratus have slowly filtered in from the west with generally
clear visibility nearing 60 miles in most directions.

By 1:00 PM EST a maximum of 61F had been reached.

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant offshore SE,
few cirrus fibratus
Temperature: 48F; Dew Point: 44F; Wind: estimated N at 4 kts
Wind Speed: Light
Sea-level pressure: 30.25 ins. Hg, rising, then more slowly
Visibility: 60 miles, thin fog in all directions
6-hr max temp: 49F
6-hr min temp: 39F
24-hr precip: 0.19 in.
BHO SA 1155 CLR 60 243/48/44/E3604/025/ FEW SC DSNT OFFSHR SE
FEW CI DSNT S-WNW THN FG ALQDS WND LGT/ 8/501 51012 ASOS 70019
MANUAL 70019 10049 20039

10 A.M.
Weather: Clear, few cumulus distant SE-W, few cirrus SE-NE
Temperature: 57F; Dew Point: 37F; Wind: ENE at 7 kts
Sea-level pressure: 30.25 ins. Hg, rising slightly
Visibility: 60 miles, thin fog in all directions
BHO SA 1455 CLR 60 244/57/37/0607/025/ FEW CU DSNT SE-W
FEW CI SE-NE THN FG ALQDS/ 8/101 50001

1 P.M.
Weather: Broken cirrus/cirrostratus fibratus, few cumulus
distant SE-N
Temperature: 60F; Dew Point: 37F; Wind: ESE at 9 kts,
Sea-level pressure: 30.24 ins. Hg, falling steadily
Visibility: 60 miles, light distant haze W-NW
6-hr max temp: 61F
6-hr min temp: 48F
BHO SA 1755 E250 BKN 60 240/60/37/1109/024/ FEW CU DSNT SE-N
LGT DSNT HZ W-NW/ 8/106 57004 10061 20048

WEATHER SUMMARY FOR WEDNESDAY, MAY 28, 2014

TEMPERATURE (DEGREES F)
MAX…..48    NORMAL…..70
MIN…..40    NORMAL…..51
MEAN….44    NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL…………………….-17
TOTAL DEPARTURE FOR THE MONTH…………………….+54 [+1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..21  DEPARTURE………+15
TOTAL HEATING UNITS FOR THE MONTH………….191  DEPARTURE………-61
TOTAL HEATING UNITS FOR THE SEASON………..6362  DEPARTURE………+75
TOTAL HEATING UNITS LAST SEASON TO DATE……5733  DIFFERENCE…….+629

COOLING DEGREE DAYS (SEASON JAN-DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….13   DEPARTURE……….-6
TOTAL COOLING UNITS FOR THE SEASON…………13   DEPARTURE……….-8
TOTAL COOLING UNITS LAST SEASON TO DATE……..6   DIFFERENCE………+7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………32  NE   AT   12:34 P.M.
ASOS…………………..36  ENE  AT    1:02 P.M.
DAVIS………………….33  NE   AT   12:33 P.M. RMY 35
FASTEST MILE FOR YESTERDAY………………..23  NE   AT    1:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..23  NE   AT    1:02 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….22  NE   AT   12:54 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.5 NE
ASOS………………….13.0
DAVIS…………………11.9 NE [48 deg] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.19  DEPARTURE………….+0.04
ASOS…………..0.19
TOTAL PRECIPITATION FOR THE MONTH……….3.13  DEPARTURE………….-0.53
ASOS…………..3.14
TOTAL PRECIPITATION FOR THE YEAR……….22.25  DEPARTURE………….+0.04
ASOS………….22.64

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/+10/0.26/0.0/026/03         36 S   RMY 41
5/17 74/52/63/+6/1.04/0.0/555/63          36 SSE RMY N/A
5/18 67/47/57/-1/0.00/0.0/521/59          20 NW  RMY N/A
5/19 65/48/56/-2/0.12/0.0/443/50          35 NNW RMY 38
5/20 71/48/60/+2/T/0.0/771/89             25 NNW RMY 26
5/21 71/51/61/+2/0.00/0.0/…/..          18 ESE RMY 20
5/22 67/51/59/0/0.26/0.0/…/..           15 SSE RMY 18
5/23 60/49/55/-4/0.05/0.0/…/..          16 NE  RMY 18
5/24 65/49/57/-2/0.02/0.0/…/..          17 ENE RMY 18
5/25 71/49/60/0/0.00/0.0/…/..           20 S   RMY N/A
5/26 76/52/64/+4/0.05/0.0/…/..          30 W   RMY 34
5/27 74/47/61/+1/…./0.0/…/..          25 NE  RMY 31
5/28 48/40/44/-17/…./0.0/000/00         32 NE  RMY 35

5/29 morning low temp: 39F; the normal low is now 52F

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 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945

RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Brian Fitzgerald