Daily Discussion

| May 9, 2013 | Reply

 

 

 

BLUE HILL METEOROLOGICAL OBSERVATORY

MILTON, MASSACHUSETTS

ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

 

DAILY DISCUSSION AND CLIMATE SUMMARY

THURSDAY, MAY 9, 2013

ALL TIMES ARE IN EASTERN STANDARD TIME

 

FIRST RAINFALL SINCE APRIL 25 TOTALS 0.62 INCH

 

The showers which began yesterday morning included a

thunder storm late last night with about a quarter inch

of rain in one hour.

Rain ended at 1:30 P.M. early this afternoon and the

total rainfall for the two days was 0.62 inch.  

 

Very dry conditions continued from March 20 through May 7 (49 days),

Blue Hill had received only 2.44 inches of precipitation. That is only

32% of the 30-year normal of 7.67 inches for this time period.  No

measurable precipitation had fallen since April 25 until May 8th. .

 

Today’s observations:

 

7 A.M.

Weather: Obscurement with fog, very light drizzle occurring 

Temperature: 58F; Dew Point: 58F; Wind: ENE at 2 kts, estimated,

Wind: Light 

Sea-level pressure: 30.01 ins. Hg, rising slightly 

Visibility: 1/16 variable to 1/8 mile in very light drizzle and

dense fog  

6-hour min. temp: 57F

24-hour precip: 0.44 inch

BHO SA 1155 W3 X 1/16VL-F 161/58/58/E0702/001/ VSBY 1/16V1/8

PCPN VRY LGT WND LGT/ 8//// 51003 MANUAL 6000/ MANUAL 70044

ASOS 70042 10059 20057

 

10 A.M.

Weather: Obscurement with heavy fog 

Temperature: 59F; Dew Point: 59F; Wind: ENE at 2 kts, estimated,

Wind: Light

Sea-level pressure: 30.00 ins. Hg, falling slightly

Visibility: 1/8 mile in dense fog 

3-hourly precip: 0.04 in.

BHO SA 1455 W3 X 1/8F 159/59/59/E0702/000/ WND LGT/ 8////

58002 MANUAL 6004/ ASOS 60004

 

1 P.M.

Weather: Scattered cumulonimbus, scattered stratus fractus, scattered

altocumulus lenticularis, scattered dense cirrus anvil top from cumulonimbus,

broken cirrus, dark sky distant N-ESE cumulonimbus N-ESE moving moving NNE   

Temperature: 63F; Dew Point: 60F; Wind: NE  at 4 kts,

Wind: Light

Sea-level pressure: 29.96 ins. Hg, falling then more rapidly

Visibility: 6 miles, fog, visbility 25 miles SSE-SW

6-hour max. temp: 63F 

6-hour precip: 0.18 in.  

BHO SA 1755 5 SCT 150 SCT 200 SCT E220 BKN 6F 146/63/60/0505/996/

CB AND DRK XTDNG DSNT N-ESE MOVG NNE STRA DRFTG AT/BLO SMT LVL ALQDS

FEW ACSL DARK N-ESE VSBY SSE-SW 25 WNW-E 5 RE35/ 8/943 58013

ASOS 60017 MANUAL 6018/ 10063 20058

 

WEATHER SUMMARY FOR WEDNESDAY, MAY 8, 2013

 

TEMPERATURE (DEGREES F)

MAX…..71     NORMAL…..64

MIN…..55     NORMAL…..45

MEAN….63     NORMAL…..55

 

DEPARTURE FROM 30-YEAR NORMAL………………..+8

TOTAL DEPARTURE FOR THE MONTH………………..+8 [+0.8 DEGREE/DAY]

 

HEATING DEGREE DAYS 

TOTAL HEATING UNITS FOR YESTERDAY………….2   DEPARTURE……….-9

TOTAL HEATING UNITS FOR THE MONTH…………81   DEPARTURE………-12

TOTAL HEATING UNITS FOR THE SEASON………5603   DEPARTURE……..-524

TOTAL HEATING UNITS LAST SEASON TO DATE….4827   DIFFERENCE…….+776

 

PEAK GUST AND AVERAGE WIND SPEED (MPH)

PEAK WIND GUST FOR YESTERDAY……………31 SSE AT  1:20 P.M. 

                   AERO………………..35 SSE AT  1:20 P.M.

                   ASOS………………..33 SSE AT  1:20 P.M.

                   DAVIS……………….34 SSE AT  1:22 P.M. RMY: 35

THE FASTEST MILE FOR YESTERDAY………….26 SSE AT  1:21 P.M.

MAXIMUM 2-MINUTE ASOS AVERAGE…………..25 SSE AT  1:22 P.M. 

MAXIMUM 2-MINUTE DAVIS AVERAGE………….26 SE  AT  1:21 P.M.

AVERAGE WIND SPEED AND DIRECTION………10.1 SE

                   ASOS……………….9.6

                   DAVIS………………9.6 SE [140 deg]

 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)

TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.44  DEPARTURE………..+0.32

                         ASOS…………..0.42

TOTAL PRECIPITATION FOR THE MONTH……….0.44  DEPARTURE………..-0.55                         ASOS…………..0.00

TOTAL PRECIPITATION FOR THE YEAR……….16.82  DEPARTURE………..-2.72

                         ASOS…………..N/A*

*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

                       

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………….99.0   DEPARTURE………..+36.3

 

PRELIMINARY CLIMATE SUMMARY FOR MAY 2013 CALENDAR DAY DATA

DATA REPORTED:

DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST

AERO: Aerovane wind recording system gust

RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011

TSTM: Thunderstorm day (thunder heard some time during day)

….: Data not yet available, records not finalized

                             

5/1  67/45/56/+3/0.00/845/100        18 E   AERO 16 MPH E   RMY 17

5/2  75/43/59/+6/T/669/79            29 NE  AERO 26 MPH NE  RMY 29

5/3  54/42/48/-5/0.00/706/83         24 NE  AERO 25 MPH NE  RMY 28

5/4  55/40/48/-6/0.00/843/99         21 NE  AERO 23 MPH NE  RMY 23  

5/5  58/37/48/-6/0.00/752/88         17 ENE AERO 17 MPH ENE RMY 20

5/6  66/40/53/-1/0.00/…/..         17 S   AERO 18 MPH S   RMY 20

5/7  77/50/64/+9/0.00/…/..         21 S   AERO 23 MPH S   RMY 25

5/8  71/55/63/+8/…./…/..         31 SSE AERO    MPH SSE RMY 35 

 

5/9  morning low temp: 57F; the normal low is now 46F

 

DAILY RECORDS FOR MAY 2013

None so far.

 

DAILY EXTREMES

Temperature and precipitation records back to 1885, and

wind records back to 1940 (e = estimated):

 

RECORDS FOR MAY 9

HIGH 93F IN 2000

LOW 31F IN 1947

PRECIP 2.72 INCHES IN 1954

SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)

PEAK GUST 70e MPH NE IN 1977

 

RECORDS FOR MAY 10

HIGH 93F IN 1896

LOW 29F IN 1900

PRE 1.85 INS IN 1998

SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)

PEAK GUST 64 MPH S IN 1990

 

TODAY’S REPORT PREPARED BY: Robert Skilling

 

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