Wednesday, April 12, 2023

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

WEDNESDAY, APRIL 12, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0509E
SUNSET:  1822E

FILTERED SUNSHINE THROUGH MAINLY HIGH CLOUDS, WINDY AND WARM
ONCE AGAIN HERE AT BLUE HILL…

The dry stretch of weather continues as we’ve not recorded any
rainfall in the last 6 days. The precipitation departure has
now slipping into a pretty sizable deficit for the month to
date, with us being more a 1.45″ below normal.

With the abnormally warm temperatures occurring this week, and
the continued low relative humidity, the ground will continue
to dry out at a rapid clip. This will markedly increase the fire
danger through the week. A Red Flag Warning is once again in
effect for this reason.

Speaking of abnormally warm, we have reached the low 70s today
so far. Our morning low was 58F degrees, which will establish
a new record high minimum for the date if it holds (we probably
get a new record either way). The previous record was 50F set
back in 1955 and 2017.

The wind has been quite gusty all day out of the northwest to
north-northwest. The peak gust so far is around 45mph. The
average speed for the day so far is around 16mph.

Visibility has been excellent all day running between 70-80
miles.

The high so far today is 71F, which is 16F degrees above the
normal maximum of 55F. The low since midnight is 58F degrees,
which is 21 degrees above the normal minimum for the day of 37F.

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Today’s Observations:

7 A.M.
Weather: Broken cirrostratus, thin broken cirrus
Temperature: 59F; Dew Point: 30F; Relative Humidity: 33%
Wind: NNW @ 16G23 kts
Sea-level pressure: 1007.9 mb; 29.76 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 58F
24-hr Precip:  0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E200 BKN 250 -BKN 70 079/59/30/3316G23/976/ 8/008 51025
10061 20058

10 A.M.
Weather: Broken cirrostratus, thin broken cirrus, few stratocumulus
distant SSW-W-N
Temperature: 63F; Dew Point: 28F; Relative Humidity: 26%
Wind: NW @ 19G32 kts, peak wind NW 46mph at 9:33 A.M.
Sea-level pressure: 1008.3 mb; 29.78 in. Hg: falling, then rising
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E200 BKN 250 -BKN 80 083/63/28/3219G32/978/ FEW SC DSNT
SSW-W-N PK WND 3240/33/ 8/008 53004

1 P.M.
Weather: Broken cirrostratus, thin broken cirrus, few small cumulus
SW-N
Temperature: 70F; Dew Point: 35F; Relative Humidity: 27%
Wind: NNW @ 20G32 kts, peak wind NNW 39mph at 12:07 P.M.
Sea-level pressure: 1006.6 mb; 29.72 in. Hg: falling, then rising
Visibility: 80 miles
6-hr Max temp: 71F
6-hr Min temp: 59F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E200 BKN 250 -BKN 80 066/70/35/3320G32/972/
FEW SML CU SW-N PK WND 3334/07/ 8/008 55017 10071 20059

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SUMMARY FOR TUESDAY, APRIL 11, 2023

TEMPERATURE (DEGREES F)
MAX…….75   NORMAL…..54
MIN…….45   NORMAL…..36
MEAN……60   NORMAL…..45

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+15
TOTAL DEPARTURE FOR THE MONTH…………………+38 [+3.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….5  DEPARTURE…….-15
TOTAL HEATING UNITS FOR THE MONTH…………..203  DEPARTURE…….-39
TOTAL HEATING UNITS FOR THE SEASON…………4735  DEPARTURE……-854
TOTAL HEATING UNITS LAST SEASON TO DATE…….5067  DEPARTURE……-332

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.

F420C (Official)………..37 W   @  3:19 P.M.
VECTOR #1 (1-Sec)……….37 W   @ 12:44 P.M.
VECTOR #2 (1-Sec)……….39 W   @  3:45 P.M.
DAVIS #1……………….37 W   @  1:09 P.M.
DAVIS #2 ………………38 W   @  3:46 P.M.
RMY #1 (Instantaneous)…..38 WSW @  1:15 P.M.
RMY #2 (Instantaneous)…..41 W   @  3:45 P.M.
MERLIN…………………37 W
RICHARDS (C5C) (Inst)……39     @  3:19 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 W   @  3:33 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..28     @  3:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28     @  3:20 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 WSW @  1:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 W   @  3:20 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 W   @  3:20 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 W   @  3:20 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………26     @  3:20 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..14.1 W [338 total miles] VECTOR #1………………13.8
VECTOR #2………………14.1
DAVIS #1……………….M
DAVIS #2……………….M
RMY #1…………………13.5 WSW
RMY #2…………………13.9 WSW
RICHARDS (C5C)………….13.7

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.43 DEPARTURE…..-1.46
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-0.87

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-1.8
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-33.8

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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY:  R.M. Young wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

4/1   60/39/50/+9/0.39/0.0/145/19         36 SW   VEC1 40 SW  RMY 41
4/2   50/30/40/-1/0.00/0.0/636/83         40 NNW  VEC1 44 NNW RMY 45
4/3   51/28/40/-2/0.00/0.0/737/96         41 SSW  VEC1 46 SSW RMY 46
4/4   62/40/51/+9/0.00/0.0/594/77         26 ENE  VEC1 26 ENE RMY 27
4/5   45/37/41/-2/0.02/0.0/000/00         33 ENE  VEC1 34 ENE RMY 37
4/6   62/37/50/+7/0.02/0.0/155/20         26 NW   VEC1 28 NNW RMY 29
4/7   58/36/47/+3/0.00/0.0/328/42         45 WNW  VEC1 48 WNW RMY 52
4/8   50/29/40/-4/0.00/0.0/767/98         26 NNW  VEC1 29 NNW RMY 31
4/9   54/33/44/0/0.00/0.0/770/98          25 S    VEC1 28 S   RMY 28
4/10  65/33/49/+4/0.00/0.0/772/98         18 WSW  VEC1 19 NW  RMY 20
4/11  75/45/60/+15/0.00/0.0/522/66        37 W    VEC1 37 W   RMY 38

4/12  The low since midnight is 58F, the daily normal low is 37F

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

RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 9.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978

RECORDS FOR APRIL 13
HIGH 85 IN 1945
LOW 22 IN 1939
PRECIP 2.51 IN. IN 2004
SNOWFALL 6.8 IN. IN 1933
PEAK GUST 79 MPH S IN 2020

TODAY’S REPORT PREPARED BY: Matt Douglas