RAMMB: Regional and Mesoscale Meteorology Branch



Talking Points for Detecting Low-level Thunderstorm Outflow (LTO) Boundaries at Night:

1) Classic Tstorm Outflow

A) Normal preference of visible imagery over others during the day

B) Identify outflows in upper-left panel (2)

C) Note importance of boundary later in the time period

D) Enhancement of IR example at cold end (typical) draws attention to the cold end when we want to monitor the warm end in this case.

2) May 31 10.7um (overnight hours: 5-10 UTC)

A) Ask for a student to identify outflow if possible

B) Main point: Hard to see outflow clouds in 10.7um because ground and cloud temps are not that different.

C) Discuss MCS appearance and anvil temperature gradients....where to look for outflows in scene.

3) May 31 3.9um (overnight hours: 5-10 UTC)

A) Low-level cloud features are revealed

B) Cold tops are "speckly" due to noise increase in 3.9um at cold temps (5 C)

C) Note that source regions and movement of low cloud areas can now also be seen

4) Understanding the Fog/Stratus product

A) Satellite senses what temperature at 3.9 um ?

B) Cloud is different temperature (in reality) than that sensed in 3.9um...this is due to emissivity ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download