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The Data originates at the National Weather Service, and is
made available here by the
UAlbany Department of Earth and Atmospheric Sciences
Surface Observations
KDCA 090052Z 00000KT 10SM FEW250 M02/M11 A3016 RMK AO2 SLP213 T10171111=
KDCA 090152Z 26003KT 10SM FEW250 M02/M11 A3018 RMK AO2 SLP217 T10171111=
KDCA 090252Z 21004KT 10SM CLR M02/M11 A3018 RMK AO2 SLP220 T10171111 53010=
KDCA 090352Z 00000KT 10SM CLR M02/M11 A3018 RMK AO2 SLP219 T10171106 $=
KDCA 090452Z 21005KT 10SM SCT200 M03/M10 A3019 RMK AO2 SLP223 T10331100
400111061 $=
KDCA 090552Z 00000KT 10SM BKN200 M04/M11 A3020 RMK AO2 SLP226 4/013 T10391106
11006 21056 53006 $=
KDCA 090652Z 00000KT 10SM OVC200 M03/M10 A3019 RMK AO2 SLP223 T10331100 $=
KDCA 090752Z 00000KT 10SM OVC200 M03/M11 A3020 RMK AO2 SLP224 T10331106 $=
KDCA 090852Z 03003KT 10SM FEW150 OVC200 M03/M08 A3019 RMK AO2 SLP222 T10281083
56004 $=
KDCA 090952Z 36004KT 10SM BKN200 M04/M11 A3017 RMK AO2 SLP216 T10391106=
KDCA 091052Z 33006KT 10SM FEW150 BKN200 M03/M11 A3017 RMK AO2 SLP216 T10331111=
KDCA 091152Z 00000KT 10SM SCT130 BKN200 M04/M10 A3016 RMK AO2 SLP211 4/013
T10391100 11022 21056 56011=
KDCA 091252Z 00000KT 10SM FEW090 BKN120 OVC200 M03/M09 A3015 RMK AO2 SLP209
T10281089=
KDCA 091352Z 00000KT 10SM FEW095 OVC120 M03/M09 A3015 RMK AO2 SLP210 T10281094=
KDCA 091452Z 21006KT 10SM BKN060 M02/M08 A3019 RMK AO2 SLP221 T10221083 53010=
KDCA 091452Z COR 21006KT 10SM OVC060 M02/M08 A3019 RMK AO2 SLP221 T10221083
53010=
KDCA 091552Z 20003KT 10SM FEW037 OVC046 M02/M08 A3016 RMK AO2 SLP213 T10171083=
KDCA 091652Z 15003KT 10SM SCT045 OVC060 M01/M08 A3011 RMK AO2 PRESFR SLP195
T10111083=
KDCA 091752Z 20004KT 10SM BKN042 OVC060 00/M07 A3007 RMK AO2 SLP183 4/013
933024 T00001072 10000 21044 58038=
KDCA 091852Z 00000KT 10SM BKN042 OVC095 01/M07 A3000 RMK AO2 SLP159 T00061067=
KDCA 091952Z 00000KT 10SM SCT045 BKN110 OVC140 02/M08 A2997 RMK AO2 SLP148
T00171078=
KDCA 092052Z 15003KT 10SM BKN036 OVC045 02/M06 A2995 RMK AO2 SLP142 T00171061
56041=
KDCA 092152Z 11004KT 2SM -SN BKN014 BKN023 OVC050 00/M03 A2993 RMK AO2 SNB04
SLP133 P0000 T00001033=
KDCA 092252Z 07004KT 7SM -SN FEW014 BKN041 OVC050 00/M04 A2992 RMK AO2 SNE19B39
SLP131 P0001 T00001039=
KDCA 092352Z 08004KT 3/4SM R01/5000V5500FT -SN BR VV003 M01/M03 A2990 RMK AO2
SLP124 SNINCR 1/13 931006 4/013 P0007 60008 T10111028 10022 21011 56018=
KDCA 100052Z 09005KT 3/4SM R01/5000V6000FT -SN BR VV003 M01/M03 A2988 RMK AO2
SLP118 SNINCR 2/15 P0010 T10111028=
Decoded Surface Observations
The weather observed at WASHINGTON DC, VA (KDCA) at 07:52 PM EST was:
The skies were mostly clear.
Temperature: 28F ( -2C) Dewpoint: 12F (-11C) Relative Humidity: 50%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.3 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 08:52 PM EST was:
The skies were mostly clear.
Temperature: 28F ( -2C) Dewpoint: 12F (-11C) Relative Humidity: 50%
Winds from the W (260 degs) at 3 mph.
Pressure: 1021.7 millibars. Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 09:52 PM EST was:
The skies were clear.
Temperature: 29F ( -2C) Dewpoint: 12F (-11C) Relative Humidity: 49%
Winds from the SW (210 degs) at 5 mph.
Pressure: 1022.0 millibars. Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 10:52 PM EST was:
The skies were clear.
Temperature: 29F ( -2C) Dewpoint: 13F (-11C) Relative Humidity: 51%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.9 millibars. Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 11:52 PM EST was:
The skies were partly cloudy.
Temperature: 26F ( -3C) Dewpoint: 14F (-10C) Relative Humidity: 60%
Winds from the SW (210 degs) at 6 mph.
Pressure: 1022.3 millibars. Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 24 hours was 34F.
The minimum temperature in the past 24 hours was 21F.
The weather observed at WASHINGTON DC, VA (KDCA) at 12:52 AM EST was:
The skies were mostly cloudy.
Temperature: 25F ( -4C) Dewpoint: 13F (-11C) Relative Humidity: 60%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1022.6 millibars. Altimeter:30.20 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 22F.
The weather observed at WASHINGTON DC, VA (KDCA) at 01:52 AM EST was:
The skies were cloudy.
Temperature: 26F ( -3C) Dewpoint: 14F (-10C) Relative Humidity: 60%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1022.3 millibars. Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 02:52 AM EST was:
The skies were cloudy.
Temperature: 26F ( -3C) Dewpoint: 13F (-11C) Relative Humidity: 57%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1022.4 millibars. Altimeter:30.20 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 03:52 AM EST was:
The skies were cloudy.
Temperature: 27F ( -3C) Dewpoint: 17F ( -8C) Relative Humidity: 66%
Winds from the NE (030 degs) at 3 mph.
Pressure: 1022.2 millibars. Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 04:52 AM EST was:
The skies were mostly cloudy.
Temperature: 25F ( -4C) Dewpoint: 12F (-11C) Relative Humidity: 58%
Winds from the N (360 degs) at 5 mph.
Pressure: 1021.6 millibars. Altimeter:30.17 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 05:52 AM EST was:
The skies were mostly cloudy.
Temperature: 27F ( -3C) Dewpoint: 12F (-11C) Relative Humidity: 54%
Winds from the NW (330 degs) at 7 mph.
Pressure: 1021.6 millibars. Altimeter:30.17 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 06:52 AM EST was:
The skies were mostly cloudy.
Temperature: 25F ( -4C) Dewpoint: 14F (-10C) Relative Humidity: 63%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.1 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 28F.
The minimum temperature in the past 6 hours was 22F.
The weather observed at WASHINGTON DC, VA (KDCA) at 07:52 AM EST was:
The skies were cloudy.
Temperature: 27F ( -3C) Dewpoint: 16F ( -9C) Relative Humidity: 63%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1020.9 millibars. Altimeter:30.15 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 08:52 AM EST was:
The skies were cloudy.
Temperature: 27F ( -3C) Dewpoint: 16F ( -9C) Relative Humidity: 63%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1021.0 millibars. Altimeter:30.15 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 09:52 AM EST was:
The skies were mostly cloudy.
Temperature: 28F ( -2C) Dewpoint: 17F ( -8C) Relative Humidity: 63%
Winds from the SW (210 degs) at 7 mph.
Pressure: 1022.1 millibars. Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 09:52 AM EST was:
The skies were cloudy.
Temperature: 28F ( -2C) Dewpoint: 17F ( -8C) Relative Humidity: 63%
Winds from the SW (210 degs) at 7 mph.
Pressure: 1022.1 millibars. Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 10:52 AM EST was:
The skies were cloudy.
Temperature: 28F ( -2C) Dewpoint: 18F ( -8C) Relative Humidity: 64%
Winds from the SSW(200 degs) at 3 mph.
Pressure: 1021.3 millibars. Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 11:52 AM EST was:
The skies were cloudy.
Temperature: 30F ( -1C) Dewpoint: 18F ( -8C) Relative Humidity: 59%
Winds from the SE (150 degs) at 3 mph.
Pressure: 1019.5 millibars. Altimeter:30.11 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 12:52 PM EST was:
The skies were cloudy.
Temperature: 32F ( 0C) Dewpoint: 19F ( -7C) Relative Humidity: 58%
Winds from the SSW(200 degs) at 5 mph.
Pressure: 1018.3 millibars. Altimeter:30.07 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 32F.
The minimum temperature in the past 6 hours was 24F.
The weather observed at WASHINGTON DC, VA (KDCA) 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: 1015.9 millibars. Altimeter:30.00 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 02:52 PM EST was:
The skies were cloudy.
Temperature: 36F ( 2C) Dewpoint: 18F ( -8C) Relative Humidity: 48%
Winds from the CLM(CLM degs) at 0 mph.
Pressure: 1014.8 millibars. Altimeter:29.97 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 03:52 PM EST was:
The skies were cloudy.
Temperature: 35F ( 2C) Dewpoint: 21F ( -6C) Relative Humidity: 56%
Winds from the SE (150 degs) at 3 mph.
Pressure: 1014.2 millibars. Altimeter:29.95 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at WASHINGTON DC, VA (KDCA) at 04:52 PM EST was:
The skies were cloudy.
The weather reported was light snow.
Temperature: 32F ( 0C) Dewpoint: 27F ( -3C) Relative Humidity: 80%
Winds from the ESE(110 degs) at 5 mph.
Pressure: 1013.3 millibars. Altimeter:29.93 inches of mercury.
The prevailing visibility was 2 miles.
There has been 0.00 inches of precipitation in the past hour.
The weather observed at WASHINGTON DC, VA (KDCA) at 05:52 PM EST was:
The skies were cloudy.
The weather reported was light snow.
Temperature: 32F ( 0C) Dewpoint: 25F ( -4C) Relative Humidity: 74%
Winds from the ENE(070 degs) at 5 mph.
Pressure: 1013.1 millibars. Altimeter:29.92 inches of mercury.
The prevailing visibility was 7 miles.
There has been 0.01 inches of precipitation in the past hour.
The weather observed at WASHINGTON DC, VA (KDCA) at 06:52 PM EST was:
The skies were unobserved.
The weather reported was light snow and fog.
Temperature: 30F ( -1C) Dewpoint: 27F ( -3C) Relative Humidity: 88%
Winds from the E (080 degs) at 5 mph.
Pressure: 1012.4 millibars. Altimeter:29.90 inches of mercury.
The prevailing visibility was .75 miles.
The maximum temperature in the past 6 hours was 36F.
The minimum temperature in the past 6 hours was 30F.
There has been 0.07 inches of precipitation in the past hour.
There has been 0.08 inches of precipitation in the past 6 hours.
The weather observed at WASHINGTON DC, VA (KDCA) at 07:52 PM EST was:
The skies were unobserved.
The weather reported was light snow and fog.
Temperature: 30F ( -1C) Dewpoint: 27F ( -3C) Relative Humidity: 86%
Winds from the E (090 degs) at 6 mph.
Pressure: 1011.8 millibars. Altimeter:29.88 inches of mercury.
The prevailing visibility was .75 miles.
There has been 0.10 inches of precipitation in the past hour.
Short Range Forecast
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Zone Forecast
DCZ001-VAZ054-100230-
DISTRICT OF COLUMBIA-ARLINGTON/FALLS CHURCH/ALEXANDRIA-
INCLUDING THE CITIES OF...WASHINGTON...ALEXANDRIA...FALLS CHURCH
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 10 TO 14 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 40 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 AROUND 20.
.SUNDAY...MOSTLY SUNNY. HIGHS IN THE LOWER 30S.
.SUNDAY NIGHT...PARTLY CLOUDY. LOWS IN THE LOWER 20S.
.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
KDCA 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 26 30 26 38 23
TMP 32 32 32 31 29 26 24 26 27 30 30 29 28 31 36 36 32 29 26 25 35
DPT 22 23 22 21 19 16 18 18 19 17 16 16 16 16 16 15 14 12 11 13 13
CLD OV OV OV OV OV OV OV FW OV OV BK FW SC OV OV FW BK SC CL FW CL
WDR 10 06 05 02 34 33 33 33 34 33 33 33 33 34 32 32 32 31 32 32 32
WSP 05 04 06 06 12 19 22 24 22 20 18 17 16 17 16 16 12 11 09 09 11
P06 100 100 78 63 21 6 2 6 0 0 1
P12 100 84 21 6 0
Q06 3 3 1 1 0 0 0 0 0 0 0
Q12 3 2 0 0 0
T06 1/ 0 1/ 2 1/ 3 1/ 4 1/ 3 0/ 2 0/ 2 0/ 2 0/ 0 0/ 0
T12 3/ 3 1/ 4 0/ 2 0/ 2 0/ 0
POZ 51 53 28 20 10 4 4 3 1 0 6 1 2 2 0 3 2 1 0 0 1
POS 8 5 27 43 54 70 72 75 69 66 75100 80 78 81 86 74 72 69 76 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 7 8 8 8 8 8 8
VIS 6 5 5 5 5 4 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7
OBV N 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
KDCA 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 25 30| 25 38| 22 38| 19 34| 21 39| 23 34| 22 40| 25 27 47
TMP 28 28| 28 32| 24 32| 21 30| 23 35| 25 29| 24 35| 27
DPT 20 18| 15 14| 12 12| 10 13| 12 20| 16 13| 11 17| 16
WND 13 25| 23 17| 13 12| 9 13| 10 9| 9 17| 13 13| 7
P12 100 77| 14 0| 1 2| 8 7| 3 9| 44 29| 2 7| 17 22 22
P24 100| 14| 2| 8| 9| 44| 7| 32
Q12 4 1| 0 0| 0 0| 0 0| 0 0| 1 0| |
Q24 4| 0| 0| 0| 0| 1| |
T12 2 1| 1 1| 1 1| 1 1| 1 1| 3 2| 2 2| 2
T24 | 6 | 2 | 2 | 2 | 3 | 3 | 3
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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