July 2014 Recap

July 2014 Weather Summary for North Dakota

Precipitation:

After an excessively wet June, almost all of North Dakota recorded below average precipitation during the month of July (Figure 1).  The only exception was a few locations in the northeastern portion of the state.   Using data from the North Dakota Agricultural Weather Network (NDAWN), the statewide average precipitation for the month of July was 1.47 inches.  That is well below the July average of 2.87 inches.  That would rank July 2014 as the 14th driest on record. The U.S. Drought Monitor had less than 1% of North Dakota in abnormally dry conditions as of July 29, 2014.

Percent of Normal Precipitation
Percent of Normal Precipitation

 

Temperature:

July 2014 was the 10th straight month with below average temperatures in North Dakota. With the exception of a few areas near the Canadian border, the colder than average tempeatures were fairly uniformed in the -2° to -4° degree range across the state (Figure 2).    The NDAWN stations recorded an overall average temperature of 66.9 degrees which is 2.2 degrees below the 30 year average of 69.1 degrees for the month of July. That would rank the month as tied for the 25th coldest July since such records began in 1895.

 

Departure from Normal Air Tempeature
Departure from Normal Air Tempeature

 

Notable Weather:

On Monday, July 21, 2014 during the late afternoon and evening hours, a derecho (a long-lived line of severe thunderstorms) moved across North Dakota.  The strong wind associated with this event caused damge from near Dickinson to Grand Forks (Figure 3).  The derecho continued into the early hours of July 22 all the way to Lake Superior before weakening.  The most widespread damage in North Dakota occurred from Carrington to Grand Forks where several tornadoes developed along the bow echo.  The top wind speed recorded at any of the NDAWN sites was a 73 mph wind gust at the McHenry station in eastern Eddy County (Figure 4).

The thunderstorms not only produced strong wind and some tornadoes, but also localized heavy rain. The National Weather Service office in Grand Forks recorded 2.74 inches of rain and the Michigan NDAWN station recorded 4.00 inches that day.  It was the most widespread severe weather event of the season to date and also the biggest rain maker for the month of July in the state.

 

Derecho Summary
Derecho Summary

 

Daryl Ritchison