- Tuesday February 1st, 2011 :: 10:39 a.m. EST
**(Winter Storm Warning)** in effect for **(Lehigh Valley)** thru **(2/2/11)**.
The National Weather Service issued a **(Winter Weather Warning)** for **(Lehigh Valley)** until **(2/2/11)**.
Attached is the Tuesday morning briefing package. The executive summary is as follows:
•Phase one of this current system will wind down late this morning in the south, and during the afternoon in the north. This means freezing drizzle in the south will change over to plain drizzle, then end by about noon. Light snow in the far north will either stay as light snow, or change over to sleet and/or freezing drizzle before ending by 3 or 4 pm. No significant precipitation is expected during the Tuesday afternoon commute. However, the Wednesday morning commute WILL be problematic.
•A lull in the precipitation is expected through the evening hours. Then precipitation associated with the second phase of this system will move in during the overnight hours (after midnight). Precipitation in a frozen form (snow, sleet, freezing rain) is expected in the northern two-thirds of the Mount Holly CWA (basically north of the C&D canal) to begin with. Then, as warmer air moves in, precipitation will change over to plain rain from south to north. However, this northward progression of plain rain will only make is so far north, then stop. Current thinking is that the Lehigh Valley and adjacent sections of central and northern New Jersey will stay in the frozen form throughout the day on Wednesday.
•As colder air moves in as the storm pulls away from the region late Wednesday, precipitation will change to light snow everywhere. Any additional accumulation near the end of the storm will be light.
• A Winter Storm Warning remains in effect north of Philadelphia for frozen precipitation this morning, and additional frozen precipitation overnight and on Wednesday. A Winter Weather Advisory remains in effect from Philadelphia south for freezing rain this morning, with a Winter Storm Watch in effect for this same area for frozen precipitation overnight and on Wednesday.
•Primary impacts from this storm system will be significant icing from freezing rain, heavy wet snow, heavy rain and minor coastal flooding.
•Icing threat: There continues to be a high risk for significant icing (in excess of 0.25 inches) due to freezing rain overnight (after midnight) and on Wednesday. There is a moderate risk for severe icing (in excess of 0.50 inches). A catastrophic icing event, while still possible, seems less likely. Highest risk areas for most severe icing is north and west of the I-95 Corridor. See icing slide for more details.
•Heavy snow threat: Snow Tuesday morning in the north will taper off this afternoon. Additional snow is possible overnight in the Lehigh Valley, southern Poconos and northwest New Jersey. However, most of the total snow that falls in these areas will come from the first phase of this system because sleet and freezing rain will be the predominate precipitation type on Wednesday.
•Rainfall threat: Areas which see primarily rain (south & east of the I-95 Corridor) can see rainfall amounts in excess of one inch. This will cause localized flooding problems. Flooding problems will be exacerbated in those areas which currently have considerable snow pack, as storm drains and culverts may be blocked by snow/ice.
•Coastal flooding threat: New moon occurs Wednesday, February 2nd, so regular high tides will be running high. Minor coastal flooding is expected during the Wednesday morning high tide, but nothing worse.
•Maintain situational awareness by monitoring our website at: http://weather.gov/phi)**.
A weather warning indicates a confirmed, current and present danger to this area.
Take necessary safety precautions.
Mike Zweifel, EMC
Borough of Coopersburg Emergency Management
5 N Main St
Coopersburg, PA 18036
Michael J Zweifel
Borough of Coopersburg