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The Winter storm of January 27-28, 2009 PowerPoint PPT Presentation


The Winter storm of January 27-28, 2009. Snow, Sleet, Freezing Rain. A Short Introduction to Cloud Physics. To make snow, the temperature must be below freezing the entire path until at the surface.

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The Winter storm of January 27-28, 2009

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The winter storm of january 27 28 2009 l.jpg

The Winter storm of January 27-28, 2009

Snow, Sleet, Freezing Rain


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A Short Introduction to Cloud Physics

  • To make snow, the temperature must be below freezing the entire path until at the surface.

  • Once snow melts as it is falling, it will not turn back into snow again, no matter the temperature.

  • Melted snow that drops below freezing will stay liquid, called "supercooled". This is freezing rain.

  • If freezing rain completely refreezes, it will become sleet.


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January 27 After Midnight

SNOW

T < 32 °F


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January 27 Early Morning

SNOW

T < 32 °F

RAIN

T > 32 °F

SLEET

T < 32 °F


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January 27 Mid Morning

SNOW

T < 32 °F

RAIN

T > 32 °F

T < 32 °F

FREEZING RAIN


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Sounding at 2:38PM

5 °C (40 °F)

at 6000 ft

-5 °C (23 °F)

at 1000 ft


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Sounding at 7:11PM

7 °C (44 °F)

at 3000 ft

-4 °C (25 °F)

at 1500 ft


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January 28 Early Morning

SNOW

T < 32 °F

RAIN

T > 32 °F


January 28 mid morning l.jpg

January 28 Mid Morning

SNOW

T < 32 °F


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Total Liquid


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Ice Accumulation


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Snow Accumulation


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What We Did

  • Tuesday January 20th (7 days in advance)

    • Outlook: Large winter system will affect area on Monday and Tuesday.

    • Forecast Tuesday: 50% chance of snow.

  • Wednesday January 21st

    • Outlook: Significant weather system will impact area early next week...accumulations of snow, sleet, and freezing rain late Monday Night and Tuesday.

    • Forecast Tuesday: 60% chance of light snow. Light snow accumulations.

  • Thursday January 22nd

    • Outlook: Storm system will impact area late Monday and Tuesday...wintery mix

    • Forecast Tuesday: 60% chance of light snow. Light snow accumulations.


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What We Did (con't)

  • Friday January 23rd

    • Outlook: Storm system will likely spread wintery precipitation Late Monday through Early Wednesday...significant accumulations possible.

    • Forecast Monday Night & Tuesday: 60% chance of snow. significant snow accumulations possible.

  • Saturday January 24th

    • Outlook: Big winter storm will impact area Late Monday through Wednesday...significant snow and ice accumulation are expected Late Monday Night through Tuesday Night.

    • Forecast Tuesday: 70% chance of snow and slight chance of sleet. Light snow accumulations.

  • Sunday January 25th

    • Preliminary Conference Call

    • Winter Storm Watch: Two waves...first wave, 3 to 6 inches of snow...second wave, quarter inch of ice.

    • Forecast

      • Monday Night: 3 to 6 inches of snow.

      • Tuesday & Tuesday Night: Freezing rain, sleet & snow.


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What We Did (con't)

  • Monday January 26th

    • Conference Calls

    • Winter Storm Warning: Snow, sleet, and ice...3 to 4 inches of snow by Tuesday Morning with an additional 1 to 2 inches of snow and sleet Tuesday Night.

    • Forecast

      • Monday Night: 3 to 5 inches of snow.

      • Tuesday: Sleet and snow until midday then sleet, freezing rain and snow in the afternoon. Snow and sleet accumulation of 1 to 2 inches...tenth of an inch ice.

      • Tuesday Night: Freezing rain and sleet in the evening, snow after midnight. Snow and sleet accumulation of 1 to 2 inches...quarter of an inch of ice.


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