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Jan 17-19 Mid-Atlantic obs/disco


Ian

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URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

244 PM EST MON JAN 17 2011

DCZ001-MDZ013-014-016-VAZ040-051>055-501-502-180345-

/O.NEW.KLWX.WW.Y.0005.110118T0300Z-110118T1400Z/

DISTRICT OF COLUMBIA-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-

RAPPAHANNOCK-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-

FAIRFAX-ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-

NORTHERN FAUQUIER-SOUTHERN FAUQUIER-

INCLUDING THE CITIES OF...WASHINGTON...ANNAPOLIS...WALDORF...

CULPEPER...MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...

FALLS CHURCH...WARRENTON

244 PM EST MON JAN 17 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO

9 AM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS

ISSUED A WINTER WEATHER ADVISORY FOR SNOW...SLEET AND FREEZING

RAIN... WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO 9 AM EST

TUESDAY.

* PRECIPITATION TYPE...SNOW...SLEET AND FREEZING RAIN. FREEZING

RAIN WILL HAVE THE MOST SIGNIFICANT IMPACT.

* ACCUMULATIONS...LESS THAN ONE INCH OF SNOW AND SLEET

ACCUMULATION. AROUND ONE TENTH OF AN INCH OF ICE ACCUMULATION.

* TIMING...A MIX OF SNOW AND SLEET WILL DEVELOP THIS EVENING

BETWEEN 10 PM AND MIDNIGHT. SNOW AND SLEET IS EXPECTED TO CHANGE

TO FREEZING RAIN BETWEEN MIDNIGHT AND 2 AM...AND WILL CONTINUE

THROUGH MUCH OF THE NIGHT. FREEZING RAIN WILL THEN CHANGE TO

RAIN EARLY TUESDAY MORNING.

* TEMPERATURES...AROUND 30 TONIGHT AND EARLY TUESDAY MORNING.

HIGHS TUESDAY AFTERNOON AROUND 40.

* WINDS...NORTHEAST 5 TO 10 MPH TONIGHT. BECOMING NORTHWEST 10 TO

15 MPH TUESDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR

FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR

SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE

DRIVING.

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URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

244 PM EST MON JAN 17 2011

DCZ001-MDZ013-014-016-VAZ040-051>055-501-502-180345-

/O.NEW.KLWX.WW.Y.0005.110118T0300Z-110118T1400Z/

DISTRICT OF COLUMBIA-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-

RAPPAHANNOCK-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-

FAIRFAX-ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-

NORTHERN FAUQUIER-SOUTHERN FAUQUIER-

INCLUDING THE CITIES OF...WASHINGTON...ANNAPOLIS...WALDORF...

CULPEPER...MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...

FALLS CHURCH...WARRENTON

244 PM EST MON JAN 17 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO

9 AM EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS

ISSUED A WINTER WEATHER ADVISORY FOR SNOW...SLEET AND FREEZING

RAIN... WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO 9 AM EST

TUESDAY.

* PRECIPITATION TYPE...SNOW...SLEET AND FREEZING RAIN. FREEZING

RAIN WILL HAVE THE MOST SIGNIFICANT IMPACT.

* ACCUMULATIONS...LESS THAN ONE INCH OF SNOW AND SLEET

ACCUMULATION. AROUND ONE TENTH OF AN INCH OF ICE ACCUMULATION.

* TIMING...A MIX OF SNOW AND SLEET WILL DEVELOP THIS EVENING

BETWEEN 10 PM AND MIDNIGHT. SNOW AND SLEET IS EXPECTED TO CHANGE

TO FREEZING RAIN BETWEEN MIDNIGHT AND 2 AM...AND WILL CONTINUE

THROUGH MUCH OF THE NIGHT. FREEZING RAIN WILL THEN CHANGE TO

RAIN EARLY TUESDAY MORNING.

* TEMPERATURES...AROUND 30 TONIGHT AND EARLY TUESDAY MORNING.

HIGHS TUESDAY AFTERNOON AROUND 40.

* WINDS...NORTHEAST 5 TO 10 MPH TONIGHT. BECOMING NORTHWEST 10 TO

15 MPH TUESDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR

FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR

SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE

DRIVING.

WHERE IS LOUDOUN???

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Winter Weather Advisory

URGENT - WINTER WEATHER MESSAGENATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC244 PM EST MON JAN 17 2011MDZ004>007-009>011-VAZ042-180345-/O.NEW.KLWX.WW.Y.0005.110118T0300Z-110118T1700Z/FREDERICK MD-CARROLL-NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-LOUDOUN-INCLUDING THE CITIES OF...FREDERICK...WESTMINSTER...GAITHERSBURG...COLUMBIA...BALTIMORE...LEESBURG244 PM EST MON JAN 17 2011...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TONOON EST TUESDAY...THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HASISSUED A WINTER WEATHER ADVISORY FOR SNOW...SLEET AND FREEZINGRAIN...WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO NOON ESTTUESDAY.* PRECIPITATION TYPE...SNOW...SLEET AND FREEZING RAIN. FREEZING RAIN WILL HAVE THE MOST SIGNIFICANT IMPACT.* ACCUMULATIONS...ONE INCH OR LESS OF SNOW AND SLEET ACCUMULATION. ONE TO TWO TENTHS OF AN INCH OF ICE ACCUMULATION.* TIMING...A MIX OF SNOW AND SLEET WILL DEVELOP THIS EVENING BETWEEN 10 PM AND MIDNIGHT. SNOW AND SLEET IS EXPECTED TO CHANGE TO FREEZING RAIN BETWEEN MIDNIGHT AND 3 AM...AND WILL CONTINUE OVERNIGHT AND EARLY TUESDAY MORNING. FREEZING RAIN WILL THEN CHANGE TO RAIN LATE TUESDAY MORNING.* TEMPERATURES...UPPER 20S TONIGHT AND EARLY TUESDAY MORNING. HIGHS TUESDAY AFTERNOON IN THE UPPER 30S.* WINDS...NORTHEAST 5 TO 10 MPH TONIGHT. BECOMING NORTHWEST 10 TO 15 MPH TUESDAY.PRECAUTIONARY/PREPAREDNESS ACTIONS...A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...ORFREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FORSLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILEDRIVING.

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URGENT - WINTER WEATHER MESSAGE

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

244 PM EST MON JAN 17 2011

MDZ004>007-009>011-VAZ042-180345-

/O.NEW.KLWX.WW.Y.0005.110118T0300Z-110118T1700Z/

FREDERICK MD-CARROLL-NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-

SOUTHERN BALTIMORE-LOUDOUN-

INCLUDING THE CITIES OF...FREDERICK...WESTMINSTER...

GAITHERSBURG...COLUMBIA...BALTIMORE...LEESBURG

244 PM EST MON JAN 17 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO

NOON EST TUESDAY...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS

ISSUED A WINTER WEATHER ADVISORY FOR SNOW...SLEET AND FREEZING

RAIN...WHICH IS IN EFFECT FROM 10 PM THIS EVENING TO NOON EST

TUESDAY.

* PRECIPITATION TYPE...SNOW...SLEET AND FREEZING RAIN. FREEZING

RAIN WILL HAVE THE MOST SIGNIFICANT IMPACT.

* ACCUMULATIONS...ONE INCH OR LESS OF SNOW AND SLEET ACCUMULATION.

ONE TO TWO TENTHS OF AN INCH OF ICE ACCUMULATION.

* TIMING...A MIX OF SNOW AND SLEET WILL DEVELOP THIS EVENING

BETWEEN 10 PM AND MIDNIGHT. SNOW AND SLEET IS EXPECTED TO CHANGE

TO FREEZING RAIN BETWEEN MIDNIGHT AND 3 AM...AND WILL CONTINUE

OVERNIGHT AND EARLY TUESDAY MORNING. FREEZING RAIN WILL

THEN CHANGE TO RAIN LATE TUESDAY MORNING.

* TEMPERATURES...UPPER 20S TONIGHT AND EARLY TUESDAY MORNING.

HIGHS TUESDAY AFTERNOON IN THE UPPER 30S.

* WINDS...NORTHEAST 5 TO 10 MPH TONIGHT. BECOMING NORTHWEST 10 TO

15 MPH TUESDAY.

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Looking at recent regional obs... CAD pretty evident in the dewpoints (or in Ian's wetbulb line)... nice little wedge of drier air

post-96-0-73490200-1295293864.png

Interesting wind change from the DC area to Central VA as well... looks like it's the start of the area where the low to the south is starting to affect.

That map is interesting. My wxbug station that I use is only 1/4 mile from me and it has a NNE wind. I am S of DCA by about 10 miles

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