Tropical Storm Arlene Makes Landfall (6/30/2011)

Figure 1. Infrared satellite imagery of the Atlantic Basin

Tropical Storm Arlene made landfall between 4am and 5am CDT near the city of Cabo Rojo, Mexico.  Maximum winds were recorded around 65 mph before making landfall, about 9 mph lower than hurricane status.  Arlene will continue to deteriorate as it continues moving west into the Sierra Madre Oriental Mountains.  This will be a very dangerous situation for many folks living in this area of Mexico, as they have to deal with lots of flooding.   Rainbands from Arlene have reached as far north as central Texas.

As far as rainfall in the Rio Grande Valley, light to moderate rainfall has fallen over the area since Tuesday, 6/28.  The latest rainfall totals, as of Wednesday afternoon, from Brownsville’s Doppler Radar are:

Figure 2. Total rainfall from 10:42pm CDT Tuesday through 10:09am CDT Thursday


Figure 3. 12Z 6/30 500mb map

Looking at 500mb (~18,000 ft), above, most of the central U.S. is under a ridge of high pressure.  A dry and stable airmass is set in this area and will see mostly sunny to partly cloudy skies until a shortwave trough, located over the southwest U.S., moves into the area tomorrow.

Today, there is a chance of severe weather east of the shortwave trough axis.  This includes states such as: eastern Utah, Colorado, southeast Wyoming, western Nebraska, North & South Dakota, and Minnesota.  As the shortwave trough moves northeast, so will the severe threat.  The Storm Prediction Center has issued out day 1 (today) and day 2 (tomorrow) severe threat:

Figure 4. Day 1 severe weather outlook issued by SPC

Figure 5. Day 2 severe weather outlook issued by SPC.

*Areas in yellow are considered to be in a slight risk of severe storms*
*Areas in green are areas that may see non-severe thunderstorms*

Figure 6. Current (18Z) Surface analysis with surface fronts from HPC

Taking a look a the surface conditions around the nation, you can see a stalled out front along the Gulf coast states.  This will be generating sea breeze showers and thunderstorms during the daytime, as long as the front is stalled there.  So, even though there is an upper level ridge affecting the mid-and-upper level of this area, surface conditions can affect lift and precipitation.


About Brian

University of Oklahoma graduate with a degree in Meteorology. Follow me on Twitter: @WeatherInformer
This entry was posted in Weather and tagged , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s