National Weather Service United States Department of Commerce

Heavy Rainfall and Flooding in the Southwest and Along the East Coast

A multi-day heavy rainfall event is set to begin across New Mexico into west Texas Tuesday through Wednesday. Flash flooding and debris flows in the vicinity of burn scars will also be possible. A strong coastal low will develop offshore of the Mid-Atlantic coast midweek, bringing heavy rainfall, strong winds and coastal flooding to much of the East Coast through Friday. Read More >

KMAF Aviation Climatology

The following values are percent of occurrence of different flying weather conditions.

The data was derived from 31 years of data (1973-2004).

Skip marginal visual flight rule occurrence table.

Ceiling between 1000-3000 feet and/or Visibility between 3-5 miles (MVFR)
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 7 % 6 % 6 % 4 % 4 % 1 % 1 % 2 % 4 % 5 % 5 % 5 % 4.2%
4 am 6 % 6 % 7 % 5 % 5 % 2 % 1 % 2 % 4 % 6 % 7 % 6 % 4.8%
7 am 6 % 7 % 10 % 7 % 9 % 3 % 2 % 1 % 5 % 8 % 8 % 7 % 6.1%
10 am 7 % 8 % 10 % 11% 12% 9 % 4 % 3 % 9 % 9 % 8 % 8 % 8.2%
1 pm 8 % 8 % 12 % 12% 16% 13% 8 % 7 % 14% 11% 10% 8 % 6.6%
4 pm 8 % 8 % 10 % 10% 12% 10% 7 % 7 % 12% 12% 9 % 6 % 8.7%
7 pm 9 % 9 % 8 % 7 % 7 % 5 % 4 % 3 % 9 % 9 % 8 % 8 % 7.2%
10 pm 8 % 8 % 7 % 4 % 5 % 2 % 2 % 2 % 5 % 5 % 7 % 7 % 5.2%

Skip instrument flight rule occurrence table.

Ceiling greater than or = 500 feet to less than 1000 feet and/or Visibility greater than or = to 1mile to less than 3 miles (IFR)
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 3 % 3 % 2 % 1 % 1 % 0 % 0 % 0 % 2 % 2 % 3 % 3 % 1.7%
4 am 3 % 4 % 2 % 1 % 1 % 0 % 0 % 0 % 2 % 3 % 3 % 4 % 1.9%
7 am 4 % 5 % 3 % 1 % 1 % 1 % 1 % 1 % 3 % 4 % 5 % 4 % 2.8%
10 am 4 % 7 % 4 % 4 % 3 % 1 % 2 % 2 % 4 % 6 % 5 % 4 % 3.8%
1 pm 6 % 7 % 4 % 6 % 5 % 2 % 2 % 2 % 5 % 7 % 6 % 3 % 4.6%
4 pm 7 % 6 % 4 % 3 % 2 % 1 % 1 % 1 % 5 % 6 % 5 % 5 % 3.8%
7 pm 5 % 6 % 3 % 1 % 1 % 0 % 0 % 0 % 3 % 3 % 4 % 4 % 2.5%
10 pm 4 % 3 % 2 % 2 % 1 % 0 % 1 % 0 % 2 % 2 % 2 % 4 % 1.9%

Skip low instrument flight rule occurrence table.

Ceiling greater than or = to 200 feet to less than 500 feet and/or Visibility greater than or = to 1/2 mile to less than 1 mile (LIFR)
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 4 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 2 % 2 % 0.9%
4 am 4 % 2 % 1 % 1 % 0 % 0 % 0 % 0 % 1 % 1 % 2 % 2 % 1.2%
7 am 4 % 3 % 2 % 1 % 1 % 0 % 0 % 0 % 2 % 2 % 3 % 2 % 1.7%
10 am 5 % 4 % 2 % 1 % 1 % 0 % 0 % 0 % 3 % 3 % 5 % 4 % 2.3%
1 pm 6 % 5 % 3 % 2 % 1 % 1 % 1 % 1 % 4 % 4 % 6 % 4 % 3.2%
4 pm 6 % 5 % 2 % 1 % 1 % 0 % 0 % 0 % 2 % 2 % 4 % 4 % 2.3%
7 pm 4 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 1 % 1 % 2 % 2 % 1.1%
10 pm 3 % 2 % 0 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 2 % 1 % 0.8%

Skip very low instrument flight rule occurrence table.

Ceiling less than 200 feet and/or Visibility less than 1/2 mile (VLIFR)
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 1 % 1 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 1 % 0.4%
4 am 3 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 0.8%
7 am 4 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 3 % 1.1%
10 am 6 % 4 % 1 % 1 % 0 % 0 % 0 % 0 % 0 % 2 % 3 % 3 % 1.7%
1 pm 5 % 6 % 2 % 1 % 1 % 0 % 0 % 0 % 1 % 3 % 3 % 4 % 2.2%
4 pm 3 % 3 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 0.8%
7 pm 1 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 0.3%
10 pm 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 0 % 0.2%

Skip marginal visual flight ruleand below occurrence table.

Ceiling less than or = to 3000 feet and/or Visibility less than or = to 5 miles
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 15% 12% 10% 5 % 5 % 0 % 0 % 0 % 0 % 0 % 1 % 1 % 0.4%
4 am 16% 14% 11% 0 % 6 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 0.8%
7 am 18% 17% 16% 0 % 11% 0 % 0 % 0 % 0 % 1 % 2 % 3 % 1.1%
10 am 22% 23% 17% 1 % 16% 0 % 0 % 0 % 0 % 2 % 3 % 3 % 1.7%
1 pm 25% 26% 21% 1 % 1 % 0 % 0 % 0 % 1 % 3 % 3 % 4 % 2.2%
4 pm 24% 22% 16% 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 0.8%
7 pm 19% 18% 12% 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 0.3%
10 pm 16% 13% 9 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 0 % 0.2%

Skip instrument flight rules and below occurrence table.

Ceiling less than 1000 feet and/or Visibility less than 3 miles
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 8% 12% 4% 1 % 1 % 0 % 0 % 0 % 2 % 2 % 6 % 6 % 3.5%
4 am 10% 8% 4% 2 % 1 % 0 % 0 % 0 % 3 % 4 % 6 % 8 % 3.8%
7 am 12% 10% 6% 2 % 2 % 1 % 1 % 1 % 5 % 7 % 10% 9 % 5.5%
10 am 15% 15% 7% 6 % 4 % 1 % 2 % 2 % 7 % 11% 13% 11% 7.8%
1 pm 17% 18% 9% 9 % 7 % 3 % 3 % 3 % 10% 14% 15% 11% 9.9%
4 pm 16% 14% 6% 4 % 3 % 1 % 1 % 1 % 7 % 8 % 10% 11% 6.8%
7 pm 10% 9% 4% 1 % 1 % 0 % 0 % 0 % 4 % 4 % 6% 7 % 3.8%
10 pm 8% 5% 2 % 3 % 1 % 0 % 1 % 0 % 2 % 2 % 5% 5 % 2.8%

Skip low instrument flight rules and below occurrence table.

Ceiling less than 500 feet and/or Visibility less than 1 mile
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 4 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 2 % 2 % 0.9%
4 am 4 % 2 % 1 % 1 % 0 % 0 % 0 % 0 % 1 % 1 % 2 % 2 % 1.2%
7 am 4 % 3 % 2 % 1 % 1 % 0 % 0 % 0 % 2 % 2 % 3 % 2 % 1.7%
10 am 5 % 4 % 2 % 1 % 1 % 0 % 0 % 0 % 3 % 3 % 5 % 4 % 2.3%
1 pm 6 % 5 % 3 % 2 % 1 % 1 % 1 % 1 % 4 % 4 % 6 % 4 % 3.2%
4 pm 6 % 5 % 2 % 1 % 1 % 0 % 0 % 0 % 2 % 2 % 4 % 4 % 2.3%
7 pm 4 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 1 % 1 % 2 % 2 % 1.1%
10 pm 3 % 2 % 0 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 2 % 1 % 0.8%

 

Ceiling less than 200 feet and/or Visibility less than 1/2 mile
Hour Jan Feb Mar Apr May Jun July Aug Sep Oct Nov Dec Ann
1 am 1 % 1 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 1 % 0.4%
4 am 3 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 0.8%
7 am 4 % 2 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 3 % 1.1%
10 am 6 % 4 % 1 % 1 % 0 % 0 % 0 % 0 % 0 % 2 % 3 % 3 % 1.7%
1 pm 5 % 6 % 2 % 1 % 1 % 0 % 0 % 0 % 1 % 3 % 3 % 4 % 2.2%
4 pm 3 % 3 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 2 % 0.8%
7 pm 1 % 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 0.3%
10 pm 1 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 0 % 1 % 0 % 0.2%