WINTER STORM WARNING ISSUED

Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE WAKEFIELD VA
311 PM EST WED DEC 15 2010

...SNOW...POSSIBLY MIXED WITH SLEET AND LIGHT FREEZING RAIN LATE
TONIGHT AND THURSDAY...

.A LOW PRESSURE SYSTEM WILL MOVE ACROSS THE MID-MISSISSIPPI
TONIGHT AND THEN INTO THE MID-ATLANTIC REGION ON THURSDAY. THIS
SYSTEM WILL SPREAD WINTER WEATHER ACROSS MOST OF THE REGION
BEGINNING LATE TONIGHT...AND ESPECIALLY ON THURSDAY. AT THIS
TIME...THE HEAVIEST SNOW AMOUNTS APPEAR TO BE FOCUSED OVER
CENTRAL AND SOUTH-CENTRAL VIRGINIA...INCLUDING THE INTERSTATE
95 CORRIDOR. THERE IS THE POTENTIAL FOR SNOW TO MIX WITH OR
CHANGE OVER TO SLEET AND LIGHT FREEZING RAIN THURSDAY AFTERNOON...
MAINLY NEAR THE NORTH CAROLINA BORDER.

VAZ048-060>062-065>071-079>082-087>089-161030-
/O.UPG.KAKQ.WS.A.0006.101216T0900Z-101217T0000Z/
/O.NEW.KAKQ.WS.W.0005.101216T0900Z-101217T0000Z/
FLUVANNA-PRINCE EDWARD-CUMBERLAND-GOOCHLAND-MECKLENBURG-LUNENBURG-
NOTTOWAY-AMELIA-POWHATAN-CHESTERFIELD-HENRICO-BRUNSWICK-DINWIDDIE-
PRINCE GEORGE-CHARLES CITY-GREENSVILLE-SUSSEX-SURRY-
INCLUDING THE CITIES OF...FARMVILLE...GOOCHLAND...SOUTH HILL...
CREWE...COLONIAL HEIGHTS...RICHMOND...LAWRENCEVILLE...
PETERSBURG...HOPEWELL...EMPORIA...WAKEFIELD
311 PM EST WED DEC 15 2010

...WINTER STORM WARNING IN EFFECT FROM 4 AM TO 7 PM EST
THURSDAY...

THE NATIONAL WEATHER SERVICE IN WAKEFIELD HAS ISSUED A WINTER
STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 4 AM TO 7 PM
EST THURSDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* ACCUMULATION...2 TO 5 INCHES OF SNOW.

* ICE AMOUNTS...A TRACE TO ONE TENTH OF AN INCH OF ICE IS
  POSSIBLE...MAINLY TOWARD THE NORTH CAROLINA BORDER THURSDAY
  AFTERNOON AND EVENING.

* TIMING: LATE TONIGHT THROUGH THURSDAY EVENING.

* IMPACTS: HAZARDOUS TRAVEL CONDITIONS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET...AND ICE ARE EXPECTED OR OCCURRING. THIS WILL MAKE TRAVEL
VERY HAZARDOUS OR IMPOSSIBLE.

It appears that before the potentially large winter storm this weekend, Richmond is slated for a glancing blow by a system coming out of the Rockies early Thursday into Thursday night. The temperature profiles for the system seem to indicate a snow event for Richmond, but some of the local meteorologists and NWS are calling for some mixing (a changeover to sleet and freezing rain). The NWS is currently expecting 2″-4″ of snow, and we could get as much as 3″-6″ before all is said and done. Mixing issue Thursday evening could limit accumulations. Snow is expected to begin around 9AM tomorrow morning.

Below is the 00z GFS from 12/15/2010. It shows us in .25-.50 liquid precip, which is roughly 2.5″-5″ of snow.

18Z NAM:

Saw on the local news that next week (19th-22nd) looks very interesting. Could we have the coveted coastal storm setup brewing? We’ll be keeping an eye on the models and posting updates. Feel free to join in on the discussion.

The 00GFS waffled again…now the storm slides OTS…

The image below is the 18z gfs and it shows us getting 9-10″ of snow total!

This graph of the 18z GFS data shows 9″ as well

12/21/2010 Update:

No measurable precipitation affected the Richmond metro area for this projected storm. Instead, the bulk of the moisture was confined to the southeast portion of the state. The sotrm system was wisked out to sea (OTS) without so much a flurry in downtown Richmond. Below is an image of the storm prior to it exiting the southeast coast:

UPDATE*

The NWS has now changed Thursday’s forecast to “Snow Likely” with a 60% chance. Snow should start around 9-10AM and continue through early evening. It may mix with some sleet and/or freezing rain as it tapers off.

The NAM is showing 3-4″ for us, as of the last run. We’ll monitor this as Thursday nears.

The NAM snow depth map as of Thurs night: