Below is a sounding showing the temperature and dewpoint temperature profile dur

Question

Below is a sounding showing the temperature and dewpoint temperature profile during a freezing rain event in Amarillo, TX in 2015 that prompted the National Weather Service to issue a ice storm warning. Examine the sounding and identify which arrow is pointing toward the “deep melting layer”.

Select one:

a. A

b. B

c. C

d. D

e. This ice storm did not have a deep melting layer. It formed due to radiation cooling at the surface over night.

7363 AMA Amarillo Arpt(Awos) 2 100 SLAT 35.23 SELV 1099 SHOW 16.54 LIFT 20.29 LFTV 20.36 SWET 56.00 KINX 9.70 CTOT 12.60 VTOT 13.70 TOTL 26.30 CAPE 0.00 CAPV 0.00 CINS 0.00 CINV 0.00 EQLV-9999 EQTV-9999 LFCT-9999 LFCV -9999 BRCH 0.00 BACV 0.00 LCLT 270.2 LCLP 855.9 MLTH 282.6 MLMR 3.67 THCK 5522 PWAT 15.62 13950 200 12160 400 7410 500 5740 m 700 3102 518 m 1000 218m 10 University of Wyoming -80 -70 -6050 40-30-2010 20 30 00Z 29 Nov 2015

Explanation / Answer

Answer B

The air just above the surface sub-freezing layer have a temperature above freezing. The air temperature is above freezing when the line is to the right of 0oC, that is between 850 – 750 mb. This layer is known as deep melting layer where the frozen precipitation from above would melt into liquid.

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