the winter storm of january 27 28 2009
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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

The Winter storm of January 27-28, 2009

Snow, Sleet, Freezing Rain

a short introduction to cloud physics
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.
january 27 early morning
January 27 Early Morning

SNOW

T < 32 °F

RAIN

T > 32 °F

SLEET

T < 32 °F

january 27 mid morning
January 27 Mid Morning

SNOW

T < 32 °F

RAIN

T > 32 °F

T < 32 °F

FREEZING RAIN

sounding at 2 38pm
Sounding at 2:38PM

5 °C (40 °F)

at 6000 ft

-5 °C (23 °F)

at 1000 ft

sounding at 7 11pm
Sounding at 7:11PM

7 °C (44 °F)

at 3000 ft

-4 °C (25 °F)

at 1500 ft

january 28 early morning
January 28 Early Morning

SNOW

T < 32 °F

RAIN

T > 32 °F

what we did
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.
what we did con t
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.
what we did con t15
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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