Upon adjournment, Fed Chairman Ben Bernanke & Co. will release a formal statement to the market. In it, the Fed is expected to announce “no change” in the Fed Funds Rate.

The Fed Funds Rate is currently in a target range of 0.000-0.250 percent.

The Fed Funds Rate is an inter-bank lending rate. It’s also the basis for Prime Rate, a consumer interest rate on which credit card payments are based, among other consumer loans.  Prime Rate is equal to the Fed Funds Rate + 3 percent.  Credit card rates, therefore, will likely stay flat today, too.

Mortgage rates, however, should change.  Possibly by a lot.  The 30-year fixed mortgage does not correlate with the Fed Funds Rate (as shown in the chart at right).

The reason mortgage rates will change today is because, in its statement, the Federal Reserve will highlight vrious parts of the economy, identifying strengths, weaknesses and probable threats to growth.

These observations influence investors with a stake in bond markets and future returns and, with Wall Street on edge right now — unsure of whether recent economic growth is a longer-term trend or a short-lived blip –  mortgage rates could shoot higher or they could drop, depending on how traders interpret the Fed.

It’s a difficult time to be shopping mortgages in Illinois.

Further complicating matters is Greece’s recent debt downgrade to junk status. A small contagion fear is budding worldwide and, as a result, the flight-to-quality has picked up steam. Mortgage rates are down because of it but could reverse higher at any moment.

Therefore, if you’re actively shopping for a mortgage today, it may be prudent to lock your rate ahead of the Fed’s announcement and any major market reversal. Mortgage rates may fall today, but there’s very little room for them to fall.  This is, however, a lot of room for them to rise.

The Fed adjourns at 2:15 PM ET.  Call your loan officer to lock your rate.

The 5/1 ARM is pulling away from the 30 Year Fixed.  This is a big change in loan options versus a year ago.

The data is from Freddie Mac’s weekly survey of 125 participating banks and the results show that the 5/1 ARM is getting pretty low relative to its 30 Year Fixed counterpart.

What a difference a year makes:

• In April 2009, the two products had the same mortgage rate
• In April 2010, the two products are split by 0.99 percent

On a $200,000 home loan, that’s a difference of $117 per month to a mortgage payment.

Adjustable-rate mortgages aren’t suitable for everyone, but they can be a terrific fit given your individual circumstance.  For example, any one of the following scenarios could warrant a 5-year ARM:

1. Buying a home with an intent to sell within 5 years
2. Currently financed with a 30-year fixed mortgage with plans to sell within 5 years
3. Interested in low payments and comfortable with longer-term interest rate and payment uncertainty

Additionally, homeowners with existing ARMs may want to refinance into a brand-new ARM, if only to extend the initial change date on the current note.

Before opting an ARM or a fixed, speak with your loan officer about how adjustable-rate mortgages work, and what longer-term risks may exist.  The savings may be tempting, but there’s more to consider than just the payment.