Chapter 12 cover Homework/Reading: Review 201 Precipitation Processes (or advanced – Ch 6 of W&H)...
Transcript of Chapter 12 cover Homework/Reading: Review 201 Precipitation Processes (or advanced – Ch 6 of W&H)...
Chapter 12 cover
Homework/Reading: Review 201 Precipitation Processes (or advanced – Ch 6 of W&H)Lyndon State Online Notes: http://apollo.lsc.vsc.edu/classes/met130/notes/chapter7/index.html
A Supercool Discussion:
Pure Water hard to FreezeLiquid to LatticeIf warmer than about -40 (C or F, doesn’t matter), need Ice Nuclei Colder than -15 C + IN = Good to Go-15 to -5 may freeze, otherwise, staying supercool(ed) UNTIL
Hits something below freezing, (or encounters a snowflake or other frozen hydrometeor)
Figure 12.1
N-G’s Snow/Freezing Precip. Forecasting Method (203)
• http://www.met.tamu.edu/class/wflm/tut/snow/snow5.html
• Our HDWX Chart based on it. – http://hdwx.tamu.edu/product.php?
productID=223
Figure 12.2
The “warm rain” process for freezing drizzle.
Figure 12.3
FRZL may be minor to the ground – but disastrous for aircraft.
Figure 12.4
Where did this low come from?
Figure 12.5
Figure 12.6
Deep South rare, but devastating!
Figure 12.7
Figure 12A
-Southern Ice Storm of Feb 1994 (MS, LA, AR, AL, TN, Extreme NE Texas
26 Counties in MS had Federal Disaster Declaration
Synthetic CLL Sounding from recent near Freezing Rain Event
Figure 12B
January 1998 Northeast Ice Storm
Figure 12C
1998!