April & Yearly 1999
Graphs follow the text summary!
SAT, MAY 1, 1999 1:15 PM
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MONTHLY SUMMARY OF CLIMATOLOGICAL DATA - PORTSMOUTH, VIRGINIA
Portsmouth Weather Records Service
Portsmouth, Virginia 23702-2017
(3 miles south / West Cradock Section)
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Monthly summary of Local Climatological Data for Portsmouth,
Virginia, West Cradock Section, during the month of April 1999.
Time is EST/EDT.
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D HT DN LT DN MT DN HDD CDD PREC WD WS WAS SC WXR TYPE/REMARKS
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1 76 +8 56 +11 66.0 +10 1.0 0.23 SSW21 SSW5.4 C SHRA BR
2 68 0 50 +5 59.0 +3 6.0 NE17 NE5.3 -PC FG FROPA
3 70 +3 48 +2 59.0 +3 6.0 NE14 NE4.3 PC FG
4*85 +15 55 +7 70.0 +11 5.0 0.19 NNE28 WSW8.2 PC TSRA(EVE)FROPA BR
*NEW STATION MAXIMUM TEMP
5 53 -13 41 -6 47.0 -10 18.0 NE23 NE8.3 SU FG(AM) MUCH COOLER
6 73 +8 38 -7 55.5 +1 9.5 SSW21 SSW5.2 SU BREEZY
7 82 +16 *60 +16 71.0 +16 6.0 SSW21 W6.5 SU BREEZY WARM
*NEW STATION MAX MIN TEMP
8 85 +17 55 +9 70.0 +13 5.0 WSW21 WSW4.4 SU BREEZY WARM
9 86 +20 54 +7 70.0 +14 5.0 0.51 N33 SSW8.4 PC BREEZY TSRA FROPA
10 61 -5 49 +4 55.0 0 10.0 N22 N6.1 PC COOLER
11 60 -8 47 +3 53.5 -3 11.5 *1.39 S32 SSE4.5 C SHRA TS BR FROPA
*NEW STATION DAILY PRECIP RECORD
12 61 -10 49 +3 55.0 -4 10.0 N25 N7.0 PC
13 65 -4 44 -5 54.5 -4 10.5 N23 N6.3 SU
14 74 +7 44 -5 59.0 1 7.0 WNW21 W5.0 SU PLEASANT
15 67 -2 48 -1 57.5 -2 7.5 0.07 SE16 SW2.5 PC SHRA
16 74 +4 50 +1 62.0 +3 3.0 W29 W7.7 PC GF(AM)
17 67 -3 48 -1 57.5 -2 7.5 WSW31 WSW5.5 PC
18 66 -3 44 -3 55.0 -3 10.0 WSW18 W5.1 PC
19 68 -3 42 -6 55.0 -5 10.0 WSW22 W3.5 PC
20 73 +3 51 +2 62.0 +2 3.0 T W22 NNE6.9 PC -SHRA(AM) FROPA
21 72 0 43 -8 57.5 -4 7.5 S15 SE3.0 SU
22 88 +18 54 +5 71.0 +11 6.0 SSW17 S5.4 SU BREEZY WARM
23*87 +16 62 +12 74.5 +14 9.5 SSW28 SSW8.5 PC BREEZY WARM DSTLTG
*NEW STATION MAX HIGH TEMPERATURE
24 62 -11 45 -5 53.5 -8 11.5 0.09 NNE27 NNE7.3 PC TSRA(AM) FROPA
25 66 -7 *40 -10 53.0 -9 12.0 NE15 N3.4 PC
*NEW STATION MIN LOW TEMPERATURE
26 78 +5 48 -3 63.0 +1 2.0 WSW26 SSW3.8 SU MILD
27 65 -9 52 0 58.5 -4 6.5 NE25 NE5.2 PC GF(AM)FROPA(AM)
28*58 -13 52 -1 55.0 -7 10.0 0.06 NE22 NE4.9 C BR SHRA
*NEW STATION MINIMUM HIGH TEMPERATURE
29*52 -20 48 -3 50.0 -11 15.0 0.42 NE24 NE5.4 C SHRA BR COOL
*NEW STATION MINIMUM HIGH TEMPERATURE
30*55 -19 49 -2 52.0 -11 13.0 NE34 NE11.0 C WINDY COOL
*NEW STATION MINIMUM HIGH TEMPERATURE
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SUMMARY OF APRIL 1999:
TEMPERATURE:
Monthly mean: High = 69.9 Low = 48.9 Mean = 59.4
Departure < Normal: High = + 0.3 Low = + 0.7 Mean = + 0.5
Degree Days: Heating = 206.0 Cooling = 37.5
Num er of Days Using: Heating = 23 Cooling = 7
Days with maximum temperature >= 90: 0
Days with maximum temperature <= 32: 0
Days with minimum temperature <= 32: 0
Days with minimum temperature <= 0: 0
PRECIPITATION:
Total month = 2.96" Departure from Normal = - 0.49"
Normal month (to date) = 3.45" or 86%
Average daily = 0.10"
Normal daily = 0.12"
Number of days with measurable precipitation = 8
Year-to-date = 11.43" Departure = - 3.91" or 75% of normal
Maximum for April = 7.08" in 1991 --> (Since
Minimum for April = 1.21" in 1985 --> (1977)
Number of days with 0.01" or more: 8 Snowfall
Number of days with 0.10" or more: 5 April total = 0.00"
Number of days with 0.50" or more: 2
Number of days with 1.00" or more: 1 April max = 1.1" in 1983
DAILY EXTREMES: Low temperature = 38 on the 6th
High temperature = 88 on the 22nd
Maximum daily precipitation = 1.39" on the 11th
Maximum 24-hour rainfall = 1.39" on the 11th
Maximum barometric pressure = 30.354" on the 5th
Minimum barometric pressure = 29.370" on the 9th
Frozen precip = 0.00"
WIND:
Maximum wind gust = NE 34 MPH on the 30th
Average wind speed = 5.9 MPH from a dominant NE direction
NUMBER OF:
Days Cloudy: 5 Days with thunderstorms: 4
Days Partly Cloudy: 17 # of Thunderstorms: 4
Days Clear/Sunny: 8 Days with some type of snowfall: 0
Days with Fog/Ground Fog: 10
Days with Dense Fog: 0
Days with Frost: 0
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YEAR-TO-DATE: (through April 30th, 1999)
Temperatures Degree Days Precipitation
Mean maximum: 59.2 (+1.8) Heating: Aqueous: 11.43" (DEP -3.91") 74%
Mean minimum: 40.2 (+2.0) 1879.0 Maximum monthly: 3.29"/MAR.
Mean monthly: 49.7 (+1.9) Cooling: Minimum monthly: 2.14"/FEB.
39.0
Highest: 88, April 22
Snowfall: TRACE"
Lowest: 17, January 6 Maximum daily: TRACE" (Jan. 9,10 & Mar. 8)
Days with max temperature >= 90: 0 Maximum monthly: TRACE" (Jan. & Mar.)
Days with max temperature <= 32: 1
Days with min temperature <= 32: 21 Days with some type of
Days with temperature <= 0: 0 snowfall: 8
Days with measurable
Number of: precipitation: 35 or 29.17%
Days using Heating: 112
Days using Cooling: 8 Days with thunderstorms: 9
Days Cloudy: 22 Number of thunderstorms: 10
Days Partly Cloudy: 62
Days Clear/Sunny: 36 Greatest 24-hour daily rainfall:
Days with fog/ground fog: 41 1.39"/April 11th, 1999
Days with dense fog: 3
Wind (Highest Gust): SSW 54 miles per hour, March 3rd
Barometer: Highest 30.807" on January 31st
Lowest: 29.370" on April 9th
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METAR DENOTATIONS:
BC Patches
BL Blowing
BR Fog with visibilites > 5/8 but <=6 statute miles and below
to 5/8 mile
DU Dust (widespread)
DS Duststorm
DZ Drizzle
FC Funnel Cloud
FC+ Tornado/waterspout
FG Fog with visibility <= 5/8 statute miles
FU Smoke
FZDZ Freezing drizzle
FZRA Freezing rain
FZFG Freezing fog
GR Hail
GS Small hail
HZ Haze
IC Ice crystals
PE Ice pellets
PY Spray
RA Rain
SA Sand
SS Sandstorm
PO Sand or dust whirls
SG Snow granules
SH Shower
SHRA Shower of rain
SHSN Shower of snow
SHPE Shower of ice pellets
SHGR Shower with hail
SHGS Shower with small hail
SM Statute miles
SN Snow
SQ Squalls
TS Thunderstorm
TSGR Thunderstorm with hail
TSGS Thunderstorm with small hail
TSPE Thunderstorm with ice pellets
TSRA Thunderstorm with rain
TSSN Thunderstorm with snow
UP Unknown precipitation
VA Volcanic ash
VC Vicinity
VV Used for obscurred sky
METAR Qualifiers: (now placed in FRONT of code)
- Light
+ Heavy
DR Low drifting
M Below (as in -x.x degrees)
MI Shallow
PR Partial
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PWRS DENOTATIONS: SU/CL = Clear sky; PC = Partly cloudy sky; C =
cloudy sky; NA, not available; NR, not recorded; TEMP, temperature;
MAX, maximum; MIN, minimum; T, trace of precipitation; INOP,
inoperative equipment; MPH, miles per hour; DN, departure from normal;
DEP, departure; YR, year; NORM, normal; DST LTG, distant lightning;
FROP or FROPA, frontal passage; AM morning; AFT afternoon hours;
EVE evening hours; PM evening hours; E estimated;
VBL, variable wind directions; TS, tropical storm; *tied station record
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COLUMN DENOTATIONS:
D Date PREC Precipitation
HT High Temperature WS Maximum Wind Speed (Gust)
LT Low Temperature WD Direction of Maximum Wind Gust
MT Mean Temperature WAS Average Wind Speed & Dominant
Direction
HB High Barometer Reading (Inches)
DN Departure from Normal LB Low Barometer Reading (Inches)
SC Dominant Daily Sky Cover
HDD Heating Degree Days WXR TYPES Observed Weather
CDD Cooling Degree Days Conditions and Remarks
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NOTES: All temperatures are in degrees fahrenheit. All precipita-
tion measurements are in inches. All wind speeds are in miles per
hour.
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