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The Data originates at the National Weather Service, and is
made available here by the
UAlbany Department of Atmospheric and Environmental Sciences
Surface Observations
KIAD 181652Z 31014G21KT 10SM BKN070 BKN250 23/09 A3001 RMK AO2 SLP160 T02330094=
KIAD 181752Z 32013G24KT 10SM FEW055 SCT070 BKN250 25/09 A3000 RMK AO2 SLP156
60000 T02500089 10250 20156 50000=
KIAD 181852Z 35008G17KT 10SM FEW065 SCT080 SCT250 26/09 A2998 RMK AO2 SLP149
T02560094=
KIAD 181952Z 33011G15KT 10SM FEW060 FEW080 SCT250 26/11 A2998 RMK AO2 SLP149
T02560106=
KIAD 182052Z VRB06G17KT 10SM FEW060 FEW250 25/11 A2999 RMK AO2 SLP154 T02500106
55002=
KIAD 182152Z 01007G15KT 10SM FEW060 FEW250 25/10 A2999 RMK AO2 PK WND
34026/2113 SLP153 T02500100=
KIAD 182159Z 33009KT 10SM FEW002 25/10 A2999 RMK AO2 T02500100=
KIAD 182252Z 35008KT 10SM FEW060 FEW250 24/10 A3000 RMK AO2 SLP157 T02390100=
KIAD 182352Z 02007KT 10SM FEW110 SCT250 22/09 A3001 RMK AO2 SLP162 T02220094
10261 20222 53008=
KIAD 190052Z 04005KT 10SM FEW110 SCT250 19/10 A3004 RMK AO2 SLP171 T01940100=
KIAD 190152Z 08010KT 10SM FEW250 17/11 A3008 RMK AO2 SLP183 T01720111=
KIAD 190252Z 11010KT 10SM CLR 16/11 A3009 RMK AO2 SLP189 T01560111 51026=
KIAD 190352Z 10006KT 10SM FEW019 14/09 A3011 RMK AO2 SLP195 T01390094=
KIAD 190417Z 11005KT 10SM BKN018 14/09 A3012 RMK AO2 T01390094=
KIAD 190452Z 09005KT 10SM OVC017 14/09 A3012 RMK AO2 SLP199 T01390094 402610117=
KIAD 190552Z 09004KT 10SM OVC016 14/09 A3011 RMK AO2 SLP194 T01390094 10222
20139 50006=
KIAD 190652Z 11007KT 10SM OVC015 13/09 A3009 RMK AO2 SLP187 T01330094=
KIAD 190721Z 12006KT 10SM OVC014 13/09 A3008 RMK AO2 T01330094=
KIAD 190752Z 13005KT 10SM OVC013 13/09 A3010 RMK AO2 SLP189 T01280094=
KIAD 190852Z 13006KT 10SM OVC012 13/09 A3010 RMK AO2 SLP189 T01280094 55005=
KIAD 190952Z 12006KT 10SM OVC010 12/09 A3009 RMK AO2 SLP186 T01220094=
KIAD 191052Z 11008KT 10SM OVC011 12/09 A3010 RMK AO2 SLP190 T01220089=
KIAD 191140Z 13009KT 7SM OVC009 12/09 A3010 RMK AO2 T01220094=
KIAD 191152Z 11009KT 7SM OVC009 12/09 A3010 RMK AO2 SLP190 T01170089 10139
20117 53001=
KIAD 191252Z 11009KT 7SM OVC010 12/09 A3011 RMK AO2 SLP195 T01170089=
KIAD 191352Z 11010KT 10SM OVC010 12/08 A3009 RMK AO2 SLP188 T01220083=
KIAD 191416Z 14012G20KT 7SM OVC009 12/09 A3009 RMK AO2 T01170089=
KIAD 191430Z 12009KT 7SM OVC009 12/09 A3010 RMK AO2 T01170089=
KIAD 191452Z 15011KT 7SM OVC009 12/08 A3010 RMK AO2 SLP191 T01220083 50000=
KIAD 191552Z 14008KT 7SM OVC010 12/09 A3008 RMK AO2 SLP186 T01220089=
KIAD 191652Z 18006KT 10SM OVC012 13/09 A3010 RMK AO2 SLP192 T01280089=
Decoded Surface Observations
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 PM EDT was:
The skies were mostly cloudy.
Temperature: 73F ( 23C) Dewpoint: 48F ( 9C) Relative Humidity: 41%
Winds from the NW (310 degs) at 16 mph.
Pressure: 1016.0 millibars. Altimeter:30.01 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 01:52 PM EDT was:
The skies were mostly cloudy.
Temperature: 77F ( 25C) Dewpoint: 48F ( 9C) Relative Humidity: 36%
Winds from the NW (320 degs) at 15 mph.
Pressure: 1015.6 millibars. Altimeter:30.00 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 77F.
The minimum temperature in the past 6 hours was 60F.
There has been 0.00 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KIAD) at 02:52 PM EDT was:
The skies were partly cloudy.
Temperature: 79F ( 26C) Dewpoint: 48F ( 9C) Relative Humidity: 34%
Winds from the N (350 degs) at 9 mph.
Pressure: 1014.9 millibars. Altimeter:29.98 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 PM EDT was:
The skies were partly cloudy.
Temperature: 79F ( 26C) Dewpoint: 52F ( 11C) Relative Humidity: 39%
Winds from the NW (330 degs) at 13 mph.
Pressure: 1014.9 millibars. Altimeter:29.98 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 PM EDT was:
The skies were mostly clear.
Temperature: 77F ( 25C) Dewpoint: 51F ( 11C) Relative Humidity: 40%
Winds from the VRB(VRB degs) at 7 mph.
Pressure: 1015.4 millibars. Altimeter:29.99 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 05:52 PM EDT was:
The skies were mostly clear.
Temperature: 77F ( 25C) Dewpoint: 50F ( 10C) Relative Humidity: 39%
Winds from the N (010 degs) at 8 mph.
Pressure: 1015.3 millibars. Altimeter:29.99 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 05:59 PM EDT was:
The skies were mostly clear.
Temperature: 77F ( 25C) Dewpoint: 50F ( 10C) Relative Humidity: 39%
Winds from the NW (330 degs) at 10 mph.
Altimeter:29.99 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 PM EDT was:
The skies were mostly clear.
Temperature: 75F ( 24C) Dewpoint: 50F ( 10C) Relative Humidity: 41%
Winds from the N (350 degs) at 9 mph.
Pressure: 1015.7 millibars. Altimeter:30.00 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 PM EDT was:
The skies were partly cloudy.
Temperature: 72F ( 22C) Dewpoint: 49F ( 9C) Relative Humidity: 44%
Winds from the NNE(020 degs) at 8 mph.
Pressure: 1016.2 millibars. Altimeter:30.01 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 79F.
The minimum temperature in the past 6 hours was 72F.
The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 PM EDT was:
The skies were partly cloudy.
Temperature: 66F ( 19C) Dewpoint: 50F ( 10C) Relative Humidity: 56%
Winds from the NE (040 degs) at 6 mph.
Pressure: 1017.1 millibars. Altimeter:30.04 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 09:52 PM EDT was:
The skies were mostly clear.
Temperature: 63F ( 17C) Dewpoint: 52F ( 11C) Relative Humidity: 68%
Winds from the E (080 degs) at 12 mph.
Pressure: 1018.3 millibars. Altimeter:30.08 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 10:52 PM EDT was:
The skies were clear.
Temperature: 60F ( 16C) Dewpoint: 52F ( 11C) Relative Humidity: 75%
Winds from the ESE(110 degs) at 12 mph.
Pressure: 1018.9 millibars. Altimeter:30.09 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 11:52 PM EDT was:
The skies were mostly clear.
Temperature: 57F ( 14C) Dewpoint: 48F ( 9C) Relative Humidity: 72%
Winds from the E (100 degs) at 7 mph.
Pressure: 1019.5 millibars. Altimeter:30.11 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:17 AM EDT was:
The skies were mostly cloudy.
Temperature: 57F ( 14C) Dewpoint: 48F ( 9C) Relative Humidity: 72%
Winds from the ESE(110 degs) at 6 mph.
Altimeter:30.12 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 AM EDT was:
The skies were cloudy.
Temperature: 57F ( 14C) Dewpoint: 49F ( 9C) Relative Humidity: 74%
Winds from the E (090 degs) at 6 mph.
Pressure: 1019.9 millibars. Altimeter:30.12 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 01:52 AM EDT was:
The skies were cloudy.
Temperature: 57F ( 14C) Dewpoint: 49F ( 9C) Relative Humidity: 74%
Winds from the E (090 degs) at 5 mph.
Pressure: 1019.4 millibars. Altimeter:30.11 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 72F.
The minimum temperature in the past 6 hours was 57F.
The weather observed at WASHINGTON DC, VA (KIAD) at 02:52 AM EDT was:
The skies were cloudy.
Temperature: 55F ( 13C) Dewpoint: 48F ( 9C) Relative Humidity: 77%
Winds from the ESE(110 degs) at 8 mph.
Pressure: 1018.7 millibars. Altimeter:30.09 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 03:21 AM EDT was:
The skies were cloudy.
Temperature: 55F ( 13C) Dewpoint: 48F ( 9C) Relative Humidity: 77%
Winds from the SE (120 degs) at 7 mph.
Altimeter:30.08 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 AM EDT was:
The skies were cloudy.
Temperature: 55F ( 13C) Dewpoint: 48F ( 9C) Relative Humidity: 77%
Winds from the SE (130 degs) at 6 mph.
Pressure: 1018.9 millibars. Altimeter:30.10 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 AM EDT was:
The skies were cloudy.
Temperature: 55F ( 13C) Dewpoint: 49F ( 9C) Relative Humidity: 80%
Winds from the SE (130 degs) at 7 mph.
Pressure: 1018.9 millibars. Altimeter:30.10 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 05:52 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the SE (120 degs) at 7 mph.
Pressure: 1018.6 millibars. Altimeter:30.09 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the ESE(110 degs) at 9 mph.
Pressure: 1019.0 millibars. Altimeter:30.10 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 07:40 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the SE (130 degs) at 10 mph.
Altimeter:30.10 inches of mercury.
The prevailing visibility was 7 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 AM EDT was:
The skies were cloudy.
Temperature: 53F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 83%
Winds from the ESE(110 degs) at 10 mph.
Pressure: 1019.0 millibars. Altimeter:30.10 inches of mercury.
The prevailing visibility was 7 miles.
The maximum temperature in the past 6 hours was 57F.
The minimum temperature in the past 6 hours was 53F.
The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the ESE(110 degs) at 10 mph.
Pressure: 1019.5 millibars. Altimeter:30.11 inches of mercury.
The prevailing visibility was 7 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 09:52 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 46F ( 8C) Relative Humidity: 77%
Winds from the ESE(110 degs) at 12 mph.
Pressure: 1018.8 millibars. Altimeter:30.09 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 10:16 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the SE (140 degs) at 14 mph.
Altimeter:30.09 inches of mercury.
The prevailing visibility was 7 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 10:30 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the SE (120 degs) at 10 mph.
Altimeter:30.10 inches of mercury.
The prevailing visibility was 7 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 10:52 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 47F ( 8C) Relative Humidity: 77%
Winds from the SE (150 degs) at 13 mph.
Pressure: 1019.1 millibars. Altimeter:30.10 inches of mercury.
The prevailing visibility was 7 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 11:52 AM EDT was:
The skies were cloudy.
Temperature: 54F ( 12C) Dewpoint: 48F ( 9C) Relative Humidity: 82%
Winds from the SE (140 degs) at 9 mph.
Pressure: 1018.6 millibars. Altimeter:30.08 inches of mercury.
The prevailing visibility was 7 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 PM EDT was:
The skies were cloudy.
Temperature: 55F ( 13C) Dewpoint: 48F ( 9C) Relative Humidity: 77%
Winds from the S (180 degs) at 7 mph.
Pressure: 1019.2 millibars. Altimeter:30.10 inches of mercury.
The prevailing visibility was 10 miles.
Short Range Forecast
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Zone Forecast
VAZ053-191900-
Fairfax-
Including the cities of Reston, Herndon, Annandale, Centreville,
Chantilly, McLean, and Franconia
1155 AM EDT Fri Apr 19 2024
.REST OF TODAY...Cloudy. Patchy very light drizzle late this
morning, then isolated showers this afternoon. Highs in the mid
60s. Southeast winds 5 to 10 mph. Chance of rain 20 percent.
.TONIGHT...Mostly cloudy with scattered showers. Lows in the
lower 50s. Southeast winds 5 to 10 mph, becoming northwest after
midnight. Chance of rain 50 percent.
.SATURDAY...Mostly sunny. Highs in the upper 60s. Northwest winds
10 to 15 mph with gusts up to 25 mph.
.SATURDAY NIGHT...Partly cloudy. Lows in the lower 40s. Northwest
winds 10 to 15 mph.
.SUNDAY...Partly sunny in the morning, then becoming mostly
cloudy. Highs in the lower 60s. Northwest winds 5 to 10 mph.
.SUNDAY NIGHT...Mostly cloudy. Lows in the lower 40s.
.MONDAY...Sunny. Highs in the mid 60s.
.MONDAY NIGHT...Clear. Lows in the lower 40s.
.TUESDAY...Sunny. Highs around 70.
.TUESDAY NIGHT...Mostly cloudy with a 40 percent chance of
showers. Lows in the lower 50s.
.WEDNESDAY...Partly sunny with a 40 percent chance of showers.
Highs around 70.
.WEDNESDAY NIGHT...Mostly clear. Lows in the lower 40s.
.THURSDAY...Sunny. Highs in the lower 60s.
State Forecast
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State Forecast Discussion
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GFS Short-Range Model Output Statistics (MOS) Forecast
KIAD GFS MOS GUIDANCE 4/19/2024 1200 UTC
DT /APR 19/APR 20 /APR 21 /APR 22
HR 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 06 12
N/X 49 67 39 63 38
TMP 60 62 60 57 55 52 52 57 63 65 57 50 46 42 45 55 59 60 55 44 46
DPT 49 50 51 51 48 45 44 40 35 33 33 32 31 30 30 29 29 29 30 32 34
CLD OV OV OV OV OV OV OV OV SC SC FW FW FW BK BK BK BK BK SC CL CL
WDR 15 14 14 15 02 34 34 32 29 30 33 34 33 32 30 29 30 31 31 32 33
WSP 04 07 04 04 02 07 09 10 14 16 12 08 04 02 03 08 11 11 06 04 05
P06 28 54 36 6 1 1 0 5 5 1 2
P12 54 6 3 11 3
Q06 0 1 0 0 0 0 0 0 0 0 0
Q12 1 0 0 0 0
T06 3/11 6/ 0 2/ 3 1/ 3 0/16 0/ 5 1/ 0 1/ 3 0/11 1/ 0
T12 6/16 3/ 5 0/19 1/ 5 0/11
POZ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
POS 0 0 0 0 0 0 0 0 0 0 5 0 0 11 0 13 0 9 0 0 0
TYP R R R R R R R R R R R R R R R R R R R R R
SNW 0 0 0
CIG 4 4 5 5 4 4 6 8 8 8 8 8 8 8 8 8 8 8 8 8 8
VIS 7 7 7 7 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
OBV N N N N N N N N N N N N N N N N N N N N N
GFS Long-Range Model Output Statistics (MOS) Forecast
KIAD GFSX MOS GUIDANCE 4/19/2024 0000 UTC
FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192
FRI 19| SAT 20| SUN 21| MON 22| TUE 23| WED 24| THU 25| FRI 26 CLIMO
X/N 64| 48 69| 40 63| 39 67| 41 68| 48 67| 37 61| 38 65 43 69
TMP 58| 52 58| 46 56| 47 59| 49 60| 52 60| 42 54| 45 59
DPT 52| 41 31| 31 31| 34 34| 40 41| 45 39| 29 25| 34 35
CLD OV| OV OV| CL PC| CL CL| CL PC| OV OV| CL CL| CL PC
WND 6| 9 18| 13 10| 6 8| 5 11| 8 21| 19 16| 12 13
P12 41| 47 3| 3 11| 6 4| 7 18| 30 29| 18 6| 9 9 24 25
P24 | 47| 11| 6| 18| 48| 21| 12 37
Q12 0| 1 0| 0 0| 0 0| 0 0| 0 0| 0 |
Q24 | 1| 0| 0| 0| 1| |
T12 5| 4 2| 1 0| 2 0| 1 3| 3 14| 3 1| 5 4
T24 | 5 | 2 | 2 | 2 | 7 | 14 | 8
PZP 0| 1 0| 0 0| 0 0| 0 0| 0 0| 0 2| 1 0
PSN 0| 0 0| 0 1| 0 2| 0 0| 1 1| 14 0| 0 7
PRS 0| 0 0| 11 0| 4 1| 0 1| 1 2| 12 12| 7 5
TYP R| R R| R R| R R| R R| R R| R R| R R
SNW | 0| 0| 0| 0| 0| |
NGM Model Output Statistics (MOS) Forecast
Climatological Summary
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Watch and Warning Statment
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Park/Ski Recreation Report/Forecast
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