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The Data originates at the National Weather Service, and is
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UAlbany Department of Earth and Atmospheric Sciences
Surface Observations
KIAD 090052Z 00000KT 10SM CLR M06/M10 A3015 RMK AO2 SLP214 T10561100=
KIAD 090152Z 29005KT 10SM CLR M07/M12 A3016 RMK AO2 SLP217 T10721122=
KIAD 090252Z 24003KT 10SM CLR M08/M11 A3017 RMK AO2 SLP219 T10781111 51011=
KIAD 090352Z 28004KT 10SM CLR M05/M12 A3016 RMK AO2 SLP218 T10501117=
KIAD 090452Z 25005KT 10SM CLR M08/M12 A3018 RMK AO2 SLP224 T10831122 400001106=
KIAD 090552Z 00000KT 10SM CLR M10/M12 A3019 RMK AO2 SLP226 T11001122 11033
21117 53006=
KIAD 090652Z 00000KT 10SM CLR M09/M13 A3018 RMK AO2 SLP225 T10941128=
KIAD 090752Z 00000KT 10SM FEW200 M11/M13 A3018 RMK AO2 SLP223 T11061128=
KIAD 090852Z 00000KT 10SM SCT200 M10/M13 A3017 RMK AO2 SLP219 T11001128 58007=
KIAD 090952Z 00000KT 10SM SCT200 M11/M13 A3016 RMK AO2 SLP216 T11061128=
KIAD 091052Z 02003KT 10SM SCT200 M11/M12 A3014 RMK AO2 SLP209 T11061122=
KIAD 091152Z 00000KT 10SM FEW150 BKN200 M10/M13 A3014 RMK AO2 SLP210 4/019
T11001128 11083 21122 55009=
KIAD 091252Z 00000KT 10SM FEW090 BKN110 OVC200 M09/M12 A3013 RMK AO2 SLP206
T10941117=
KIAD 091352Z 22004KT 10SM BKN075 OVC100 M06/M10 A3014 RMK AO2 SLP210 T10611100=
KIAD 091452Z 00000KT 9SM -SN SCT033 BKN055 OVC090 M04/M09 A3016 RMK AO2 SNB36
SLP217 PRECIP VRY LGHT P0000 60000 T10441089 53007=
KIAD 091552Z 00000KT 10SM SCT033 BKN055 OVC090 M03/M08 A3014 RMK AO2 SNE1455
SLP210 P0000 T10281083=
KIAD 091652Z 00000KT 10SM FEW033 BKN055 OVC100 M02/M08 A3009 RMK AO2 SLP192
T10171083=
KIAD 091752Z 00000KT 10SM CLR M01/M08 A3004 RMK AO2 CIG 045 WEST SLP177 60000
T10061083 11006 21106 58039=
KIAD 091752Z COR 00000KT 10SM SCT031 BKN046 OVC120 M01/M08 A3004 RMK AO2 SLP177
60000 T10061083 11006 21106 58039 4/019 933009=
KIAD 091752Z 00000KT 10SM CLR M01/M08 A3004=
KIAD 091852Z 00000KT 10SM FEW026 BKN065 OVC120 01/M07 A2997 RMK AO2 SLP153
T00061072=
KIAD 091952Z 00000KT 10SM FEW033 OVC080 01/M06 A2996 RMK AO2 SLP150 T00061061=
KIAD 092052Z 16003KT 10SM SCT030 OVC050 01/M08 A2992 RMK AO2 SLP136 T00111078
56041=
KIAD 092152Z 13005KT 10SM -SN OVC050 00/M06 A2989 RMK AO2 SNB51 SLP125 P0000
T00001061=
KIAD 092152Z COR 13005KT 10SM -SG OVC050 00/M06 A2989 RMK AO2 SGB51 SLP125
P0000 T00001061=
KIAD 092152Z 13005KT 10SM -SN OVC050 00/M06 A2989=
KIAD 092252Z 11003KT 1 1/2SM -SN BKN013 OVC029 M01/M04 A2990 RMK AO2 SLP128
P0001 T10111044 $=
KIAD 092352Z 10003KT 1 1/2SM -SN BR BKN008 BKN027 OVC036 M01/M03 A2986 RMK AO2
SLP116 P0002 60003 T10111028 10017 21011 58020=
KIAD 092352Z COR 10003KT 1 1/2SM -SN BR BKN008 BKN027 OVC036 M01/M03 A2986 RMK
AO2 SLP116 4/019 P0002 60003 T10111028 10017 21011 58020=
KIAD 100052Z 10004KT 3/4SM R01R/6000VP6000FT -SN BR BKN004 OVC022 M01/M03 A2984
RMK AO2 SLP108 P0005 T10111028=
Decoded Surface Observations
The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 PM EST was:
The skies were clear.
Temperature: 21F ( -6C) Dewpoint: 14F (-10C) Relative Humidity: 73%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.4 millibars. Altimeter:30.15 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 PM EST was:
The skies were clear.
Temperature: 19F ( -7C) Dewpoint: 10F (-12C) Relative Humidity: 68%
Winds from the WNW(290 degs) at 6 mph.
Pressure: 1021.7 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 09:52 PM EST was:
The skies were clear.
Temperature: 18F ( -8C) Dewpoint: 12F (-11C) Relative Humidity: 77%
Winds from the SW (240 degs) at 3 mph.
Pressure: 1021.9 millibars. Altimeter:30.17 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 10:52 PM EST was:
The skies were clear.
Temperature: 23F ( -5C) Dewpoint: 10F (-12C) Relative Humidity: 58%
Winds from the W (280 degs) at 5 mph.
Pressure: 1021.8 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 11:52 PM EST was:
The skies were clear.
Temperature: 17F ( -8C) Dewpoint: 10F (-12C) Relative Humidity: 73%
Winds from the WSW(250 degs) at 6 mph.
Pressure: 1022.4 millibars. Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 AM EST was:
The skies were clear.
Temperature: 14F (-10C) Dewpoint: 10F (-12C) Relative Humidity: 84%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1022.6 millibars. Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 26F.
The minimum temperature in the past 6 hours was 11F.
The weather observed at WASHINGTON DC, VA (KIAD) at 01:52 AM EST was:
The skies were clear.
Temperature: 16F ( -9C) Dewpoint: 9F (-13C) Relative Humidity: 73%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1022.5 millibars. Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 02:52 AM EST was:
The skies were mostly clear.
Temperature: 12F (-11C) Dewpoint: 9F (-13C) Relative Humidity: 85%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1022.3 millibars. Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 AM EST was:
The skies were partly cloudy.
Temperature: 14F (-10C) Dewpoint: 9F (-13C) Relative Humidity: 80%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.9 millibars. Altimeter:30.17 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 AM EST was:
The skies were partly cloudy.
Temperature: 12F (-11C) Dewpoint: 9F (-13C) Relative Humidity: 85%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.6 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 05:52 AM EST was:
The skies were partly cloudy.
Temperature: 12F (-11C) Dewpoint: 10F (-12C) Relative Humidity: 92%
Winds from the NNE(020 degs) at 3 mph.
Pressure: 1020.9 millibars. Altimeter:30.14 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 AM EST was:
The skies were mostly cloudy.
Temperature: 14F (-10C) Dewpoint: 9F (-13C) Relative Humidity: 80%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.0 millibars. Altimeter:30.14 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 17F.
The minimum temperature in the past 6 hours was 10F.
The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 AM EST was:
The skies were cloudy.
Temperature: 16F ( -9C) Dewpoint: 10F (-12C) Relative Humidity: 79%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1020.6 millibars. Altimeter:30.13 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 AM EST was:
The skies were cloudy.
Temperature: 21F ( -6C) Dewpoint: 14F (-10C) Relative Humidity: 73%
Winds from the SW (220 degs) at 5 mph.
Pressure: 1021.0 millibars. Altimeter:30.14 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 09:52 AM EST was:
The skies were cloudy.
The weather reported was light snow.
Temperature: 24F ( -4C) Dewpoint: 16F ( -9C) Relative Humidity: 71%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.7 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 9 miles.
There has been 0.00 inches of precipitation in the past hour.
There has been 0.00 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KIAD) at 10:52 AM EST was:
The skies were cloudy.
Temperature: 27F ( -3C) Dewpoint: 18F ( -8C) Relative Humidity: 68%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.0 millibars. Altimeter:30.14 inches of mercury.
The prevailing visibility was 10 miles.
There has been 0.00 inches of precipitation in the past hour.
The weather observed at WASHINGTON DC, VA (KIAD) at 11:52 AM EST was:
The skies were cloudy.
Temperature: 28F ( -2C) Dewpoint: 18F ( -8C) Relative Humidity: 64%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1019.2 millibars. Altimeter:30.09 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 PM EST was:
The skies were clear.
Temperature: 31F ( -1C) Dewpoint: 17F ( -8C) Relative Humidity: 56%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1017.7 millibars. Altimeter:30.04 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 31F.
The minimum temperature in the past 6 hours was 13F.
There has been 0.00 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 PM EST was:
The skies were cloudy.
Temperature: 31F ( -1C) Dewpoint: 17F ( -8C) Relative Humidity: 56%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1017.7 millibars. Altimeter:30.04 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 31F.
The minimum temperature in the past 6 hours was 13F.
There has been 0.00 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 PM EST was:
The skies were clear.
Temperature: 30F ( -1C) Dewpoint: 18F ( -8C) Relative Humidity: 59%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.04 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 01:52 PM EST was:
The skies were cloudy.
Temperature: 34F ( 1C) Dewpoint: 19F ( -7C) Relative Humidity: 55%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1015.3 millibars. Altimeter:29.97 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 02:52 PM EST was:
The skies were cloudy.
Temperature: 34F ( 1C) Dewpoint: 21F ( -6C) Relative Humidity: 60%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1015.0 millibars. Altimeter:29.96 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 PM EST was:
The skies were cloudy.
Temperature: 34F ( 1C) Dewpoint: 18F ( -8C) Relative Humidity: 51%
Winds from the SSE(160 degs) at 3 mph.
Pressure: 1013.6 millibars. Altimeter:29.92 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 PM EST was:
The skies were cloudy.
The weather reported was light snow.
Temperature: 32F ( 0C) Dewpoint: 21F ( -6C) Relative Humidity: 64%
Winds from the SE (130 degs) at 6 mph.
Pressure: 1012.5 millibars. Altimeter:29.89 inches of mercury.
The prevailing visibility was 10 miles.
There has been 0.00 inches of precipitation in the past hour.
The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 PM EST was:
The skies were cloudy.
The weather reported was light snow grains.
Temperature: 32F ( 0C) Dewpoint: 21F ( -6C) Relative Humidity: 64%
Winds from the SE (130 degs) at 6 mph.
Pressure: 1012.5 millibars. Altimeter:29.89 inches of mercury.
The prevailing visibility was 10 miles.
There has been 0.00 inches of precipitation in the past hour.
The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 PM EST was:
The skies were cloudy.
The weather reported was light snow.
Temperature: 32F ( 0C) Dewpoint: 21F ( -6C) Relative Humidity: 64%
Winds from the SE (130 degs) at 6 mph.
Altimeter:29.89 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KIAD) at 05:52 PM EST was:
The skies were cloudy.
The weather reported was light snow.
Temperature: 30F ( -1C) Dewpoint: 24F ( -4C) Relative Humidity: 78%
Winds from the ESE(110 degs) at 3 mph.
Pressure: 1012.8 millibars. Altimeter:29.90 inches of mercury.
The prevailing visibility was 1.5 miles.
There has been 0.01 inches of precipitation in the past hour.
The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 PM EST was:
The skies were cloudy.
The weather reported was light snow and fog.
Temperature: 30F ( -1C) Dewpoint: 27F ( -3C) Relative Humidity: 88%
Winds from the E (100 degs) at 3 mph.
Pressure: 1011.6 millibars. Altimeter:29.86 inches of mercury.
The prevailing visibility was 1.5 miles.
The maximum temperature in the past 6 hours was 35F.
The minimum temperature in the past 6 hours was 30F.
There has been 0.02 inches of precipitation in the past hour.
There has been 0.03 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 PM EST was:
The skies were cloudy.
The weather reported was light snow and fog.
Temperature: 30F ( -1C) Dewpoint: 27F ( -3C) Relative Humidity: 88%
Winds from the E (100 degs) at 3 mph.
Pressure: 1011.6 millibars. Altimeter:29.86 inches of mercury.
The prevailing visibility was 1.5 miles.
The maximum temperature in the past 6 hours was 35F.
The minimum temperature in the past 6 hours was 30F.
There has been 0.02 inches of precipitation in the past hour.
There has been 0.03 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 PM EST was:
The skies were cloudy.
The weather reported was light snow and fog.
Temperature: 30F ( -1C) Dewpoint: 27F ( -3C) Relative Humidity: 86%
Winds from the E (100 degs) at 5 mph.
Pressure: 1010.8 millibars. Altimeter:29.84 inches of mercury.
The prevailing visibility was .75 miles.
There has been 0.05 inches of precipitation in the past hour.
Short Range Forecast
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Zone Forecast
VAZ053-100230-
FAIRFAX-
INCLUDING THE CITIES OF...FAIRFAX
601 PM EST TUE FEB 9 2010
...WINTER STORM WARNING IN EFFECT UNTIL 7 PM EST WEDNESDAY...
.TONIGHT...SNOW. SNOW ACCUMULATION OF 4 TO 8 INCHES. LOWS IN THE
UPPER 20S. EAST WINDS AROUND 5 MPH...BECOMING NORTHEAST WITH GUSTS
UP TO 20 MPH AFTER MIDNIGHT. CHANCE OF SNOW NEAR 100 PERCENT.
.WEDNESDAY...SNOW. AREAS OF BLOWING SNOW. SNOW MAY BE HEAVY AT TIMES
IN THE MORNING WITH VISIBILITY ONE QUARTER MILE OR LESS AT TIMES.
TOTAL SNOW ACCUMULATION OF 8 TO 12 INCHES. BLUSTERY WITH HIGHS IN
THE UPPER 20S. NORTHWEST WINDS 15 TO 25 MPH. GUSTS UP TO 35 MPH...
INCREASING TO 45 MPH IN THE AFTERNOON. CHANCE OF SNOW NEAR
100 PERCENT.
.WEDNESDAY NIGHT...MOSTLY CLOUDY. A CHANCE OF SNOW IN THE EVENING.
BLUSTERY WITH LOWS IN THE LOWER 20S. NORTHWEST WINDS 20 TO 25 MPH
WITH GUSTS UP TO 45 MPH. CHANCE OF SNOW 40 PERCENT.
.THURSDAY...PARTLY SUNNY. HIGHS IN THE MID 30S. NORTHWEST WINDS
15 TO 20 MPH WITH GUSTS UP TO 30 MPH.
.THURSDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 19. NORTHWEST WINDS
10 TO 15 MPH WITH GUSTS UP TO 25 MPH.
.FRIDAY...MOSTLY SUNNY. HIGHS IN THE UPPER 30S.
.FRIDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 20.
.SATURDAY...MOSTLY SUNNY. HIGHS IN THE MID 30S.
.SATURDAY NIGHT...PARTLY CLOUDY. LOWS 15 TO 20.
.SUNDAY...MOSTLY SUNNY. HIGHS IN THE LOWER 30S.
.SUNDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 20.
.PRESIDENTS DAY...MOSTLY SUNNY. HIGHS IN THE UPPER 30S.
.MONDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 20.
.TUESDAY...MOSTLY SUNNY. HIGHS IN THE MID 30S.
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 2/09/2010 1800 UTC
DT /FEB 10 /FEB 11 /FEB 12
HR 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 12 18
N/X 23 28 24 35 18
TMP 33 32 31 29 27 23 23 24 26 28 29 28 26 28 32 33 29 25 22 20 32
DPT 20 22 23 22 19 15 15 16 15 17 16 16 15 15 15 14 12 12 10 9 13
CLD OV OV OV OV OV OV BK CL BK BK BK BK BK BK BK BK FW FW BK SC SC
WDR 06 05 04 35 31 31 31 32 32 31 32 32 31 31 30 31 30 30 31 31 31
WSP 05 04 04 06 12 16 19 21 21 20 19 17 12 14 16 14 12 10 08 07 10
P06 100 100 77 61 21 6 5 5 0 0 3
P12 100 83 21 9 0
Q06 3 3 1 1 0 0 0 0 0 0 0
Q12 3 1 0 0 0
T06 0/ 0 0/ 2 0/ 2 1/ 4 0/ 3 0/ 2 0/ 2 0/ 2 0/ 0 0/ 0
T12 2/ 2 1/ 4 0/ 2 0/ 2 0/ 0
POZ 48 53 35 25 10 6 3 1 0 2 7 3 4 3 1 2 1 2 2 1 2
POS 19 19 56 68 76 88 89 91 87 86 91 97 93 90 94 94 85 83 81 83 97
TYP Z Z Z S S S S S S S S S S S S S S S S S S
SNW 2 0
CIG 5 3 2 3 3 4 5 6 6 6 6 8 8 7 6 8 8 8 8 8 8
VIS 6 5 5 5 4 4 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7
OBV BR BR BR BR BR BR BR 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 2/09/2010 1200 UTC
FHR 24 36| 48 60| 72 84| 96 108|120 132|144 156|168 180|192
WED 10| THU 11| FRI 12| SAT 13| SUN 14| MON 15| TUE 16|WED CLIMO
N/X 20 28| 23 34| 16 36| 14 33| 14 36| 17 32| 19 38| 20 24 46
TMP 25 24| 24 27| 19 29| 17 28| 16 30| 19 27| 22 32| 23
DPT 18 14| 12 10| 9 11| 7 9| 7 15| 9 12| 11 15| 14
WND 11 23| 23 16| 12 11| 8 11| 9 8| 7 15| 13 14| 10
P12 100 75| 12 3| 2 3| 8 8| 3 10| 44 26| 2 7| 17 22 22
P24 100| 12| 3| 10| 10| 44| 7| 34
Q12 4 1| 0 0| 0 0| 0 0| 0 0| 1 0| |
Q24 4| 0| 0| 0| 0| 1| |
T12 2 0| 0 0| 0 0| 0 0| 0 0| 1 1| 0 1| 1
T24 | 3 | 1 | 1 | 1 | 1 | 1 | 1
SNW 2| 0| 9| 9| 9| | |
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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