May 2004 - a Review of Weather, Temperatures, and Precipitation for the Quad State Region.

Weather Summary for May 2004

The major weather systems affecting the Quad State Region for the month of April 2004 can be summarized as follows. This information is taken from the “Monthly Report of River and Flood Conditions“ for the region.

In May, severe weather season arrived late in the month along with an early dose of summer. During the third week of May, temperatures topped out daily in the middle and upper 80s. Several cooperative observers reported highs reaching into the lower 90s. Average temperatures for the month were up to 6 degrees above the normal of 65 to 67 degrees. Total precipitation for the month varied depending on your location in the HSA. Southeast Missouri ended May with normal to slightly above normal precipitation. Other sites ended the month with above to much above normal rainfall. Paducah received 5.76 inches for May, 1.01 inches above normal; Evansville, Indiana received 9.31 inches, 4.3 inches above normal.

A storm system, both at the surface and upper levels, passed across the region during the first few days of May. Showers and thunderstorms produced on average between three-quarters inch and 1 ½ inches. Some locations along the I-64 corridor from southeast Illinois across the Wabash River into southwest Indiana received much more. Reports of flooded roads and road closures were common.

High pressure set up in the upper levels from the 7th through the end of the month with a warm and moist south to southwesterly flow for most of May. Much of the month’s weather was produced along a quasi-stationary front that stretched across the Midwest traveling north and south with weak upper level storm systems. Enough moisture was present that when showers and thunderstorms developed, brief heavy rains were possible with the ability to drop a quick one inch in 15 to 30 minutes. Rainfall rates of 2 to 3 inches in one hour were common.

Periodic showers and thunderstorms developed between the 10th and 19th. Rainfall totals were highly variable but generally ranged between 1 ½ and 3 inches. A much larger storm system set up during the last week of May bringing daily chances of showers and thunderstorms. Total amounts between the 25th and 31st averaged between 1 and 3 inches. Evansville, IN received over 5 inches of rain.

Figure 1. May Average Daily Temperature Summaries (Degrees F) for Several Quad State Region Locations.

Location

Temperatures (F) >

High

Low

Average

Carbondale, IL

  (above normal)

Normal (94 years)  

2004 only >

76.2

79.8

52.9

61.1

64.6

70.5

Cape Girardeau, MO

  (above normal)

Normal (30 years)

2004 only >

77.7

79.4

56.3

59.7

67.0

69.6

Evansville, IN

  (above normal)

Normal (30 years)

2004 only >

77.1

79.8

54.0

60.5

65.6

70.1

Paducah, KY

  (above normal)

Normal (30 years)

2004 only >

76.9

80.5

55.0

61.8

65.9

71.2

Poplar Bluff, MO

  (above normal)

Normal (30 years)

2004 only >

79.0

79.8

55.9

61.0

67.5

70.4

Figure 2. May Average Monthly Precipitation (inches) and May 2004 Observed Precipitation for Several Quad State Region Locations

Location

 

Total Precipitation

(includes melted snow)

2004 difference

from normal

Carbondale, IL

  (below normal)

Normal:

2004:

4.82

2.49


-2.33

Cape Girardeau, MO

  (above normal)

Normal:

2004:

4.33

5.03


 0.70

Evansville, IN

  (above normal)

Normal:

 2004:

5.01

9.31


 4.30

Paducah, KY

  (above normal)

Normal:

2004:

4.75

5.76


 1.01

Poplar Bluff, MO

  (above normal)

Normal:

2004:

4.79

5.59


 0.80

 

 


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