Geography of Memphis, Tennessee

Location in Shelby County and the state of Tennessee

The City of Memphis is located on the eastern bank of the Mississippi River in the southwest corner of the U.S. state of Tennessee. It is the regional hub for a tri-state area of Arkansas, Mississippi and Tennessee.

Shelby County is located over four natural aquifers, one of which is recognized as the "Memphis sand aquifer" or simply as the "Memphis aquifer." This particular water source is stated to contain more than 100 trillion gallons (380 km³) of water.

Memphis has a humid subtropical climate, with four distinct seasons. The summer months are persistently hot and humid due to moisture encroaching from the Gulf of Mexico.

Geography

Memphis is located in southwestern Tennessee at 35°7′3″N 89°58′16″W / 35.11750°N 89.97111°W / 35.11750; -89.97111.[1] The city sits on the eastern bank of the Mississippi River at the site of the 4th Chickasaw Bluff, just south of the mouth of the Wolf River. According to the United States Census Bureau, the city has a total area of 294.8 sq mi (763.4 km2), of which 279.3 sq mi (723.4 km2) is land and 15.4 sq mi (40.0 km2), or 5.24%, is water.

Cityscape

Three bridges over the Mississippi, view from Tom Lee Park (2007)

The city of Memphis It is the regional hub for a tri-state area of Arkansas, Mississippi and Tennessee. The city center is located on the Mississippi river at the site of the earliest settlements.

Interstate 40 enters the city from the northeast, and loops above the central part of the city, exiting across the Mississippi River and traveling to the west. Interstate 55 approaches the city from the south and connects with Interstate 240 which, along with I-40, creates the Inner Beltway. Interstate 269 is Memphis' Outer Beltway, traveling from Millington to Hernando via Arlington, Collierville, Piperton, and Byhalia. Upon completion, Interstate 69 will enter Memphis from Southaven along I-55. It will continue north on I-240 and then onto I-40, where it will branch off at SR-300 to continue north towards Dyersburg. Interstate 22 will eventually travel along US-78 from Birmingham to just outside Memphis and is expected to be named sometime in 2015.

U.S. Highway 72 leaves the city traveling to the southeast. The west end of U.S. Highway 78 begins in Memphis on Linden Avenue at the intersection of 2nd Street. As it leaves Memphis, US 78 follows Lamar Avenue, historically known as Pidgeon Roost Road for the nestings of passenger pigeons formerly in the vicinity. The east end of U.S. Highway 78 terminates in Charleston, South Carolina.

Tallest buildings

Name Stories Height
100 North Main 37 430 ft (130 m)
Clark Tower Executive Suites 32 400 ft (120 m)
One Commerce Square 31 396 ft (121 m)
Sterick Building 31 365 ft (111 m)

Current Geographical Boundaries

Memphis has expanded its city limits several times within the past half-century due to annexation. The current boundaries (as of December 2012) are roughly as follows:

An area within those boundaries that has not been annexed by the city of Memphis is a neighborhood known as the Bridgewater area, roughly bounded by I-40 to the north, Germantown Parkway to the east, Shelby Farms to the south and Whitten Road to the west. Memphis did try to annex this area in the mid-2000s but held it off due to an inability to move services into the area.

Per Tennessee law, each county is required to set up urban growth boundaries for it cities. Because of this, Memphis (along with each suburb) has what is known as an annexation reserve that defines the eventual city limits. This annexation reserve includes an area between the Big Creek Drainage Canal up to the southern border of Millington, Tennessee and western border of Bartlett, an area between Lakeland, Arlington, Fayette County, and Collierville, Tennessee, and then a small portion of land south of the Southwind area mentioned above.[2]

Sections and suburbs

The core of Memphis is marked by five major districts, with smaller districts lying within their borders. These are Downtown, Midtown, North Memphis, South Memphis, and East Memphis. In recent decades the city has expanded further by annexing adjacent territories, so these names can be somewhat misleading to those who are unfamiliar to the area.

Sections and neighborhoods:

Aquifer

Shelby County is located over four natural aquifers, one of which is recognized as the "Memphis sand aquifer" or simply as the "Memphis aquifer". This particular water source, located some 350 to 1100 ft (100 – 330 m) underground, is stated to contain more than 100 trillion gallons (380 km³) of water by Memphis Light, Gas, and Water, which draws, verifies the cleanliness of, and distributes the water to over 250,000 customers.[4]

Furthermore, in the time since the tapping of the well in 1887, the aquifer has only descended 125 ft (38 m), suggesting a reliable water source in Memphis for years to come.[5]

Most Memphians recognize this as their primary water source, and take great regional pride in their possession of the aquifer. Memphis water is notably soft, low in mineral content, and free of toxic substances.[6]

Climate

Memphis
Climate chart (explanation)
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4
 
 
50
33
 
 
4.4
 
 
55
36
 
 
5.2
 
 
64
44
 
 
5.5
 
 
73
53
 
 
5.3
 
 
81
62
 
 
3.6
 
 
89
70
 
 
4.6
 
 
92
74
 
 
2.9
 
 
91
73
 
 
3.1
 
 
85
65
 
 
4
 
 
74
54
 
 
5.5
 
 
63
44
 
 
5.7
 
 
52
35
Average max. and min. temperatures in °F
Precipitation totals in inches
Source: NOAA

Memphis has a humid subtropical climate (Köppen Cfa), with four distinct seasons, and is located in USDA Plant Hardiness Zone 8,[7] as compared to most of the state, which is located in Zone 7. Historically, April is the month with the highest frequency of tornadoes, though tornadoes have occurred every month of the year. Memphis is sunny approximately 65% of the time, with monthly percent possible sunshine ranging from 50% in December to 74% in June thru August.[8] The normal annual mean temperature is 63.0 °F (17.2 °C); the coolest year was 1917 with a mean of 59.6 °F (15.3 °C), while the warmest 2012 at 65.9 °F (18.8 °C).[lower-alpha 1] Precipitation averages 53.68 in (1,363 mm) annually, falling on 108 days, with a slight lull from August to October; historically, annual precipitation has ranged from 33.44 in (849 mm) in 1916 to 76.85 in (1,952 mm) in 1957.[9]

Spring

Spring often begins in late February or early March, following the onset of a sharp warmup. This season is also known as "severe weather season" due to the higher frequency of tornadoes, hail, and thunderstorms producing winds greater than 58 miles per hour (93 km/h). Average rainfall is slightly higher during each of the spring months exceeds 5 in (127 mm), making it the wettest season, but relative humidity is at its lowest. The average last freeze of spring falls on March 19, while the first 90 °F (32 °C)+ high can be expected on May 23.[9]

Summer

The summer months (late May to late September) are dominated by temperatures between 68 and 95 °F (20 and 35 °C), and humidity due to moisture encroaching from the Gulf of Mexico. Afternoon thunderstorms are frequent during some summers, but usually brief, lasting no longer than an hour. On average, annually there are 70 days of 90 °F (32 °C)+ highs, and 2.7 days of 100 °F (38 °C)+ highs.[lower-alpha 2] The highest recorded temperature was 108 °F (42 °C) on July 13, 1980; the highest minimum temperature is 84 °F (29 °C), occurring as recently as August 3, 2010.[9] The hottest month on record was July 1980 with a daily mean of 88.8 °F (31.6 °C), but as measured by monthly average high temperature, August 2007 was the hottest at 98.9 °F (37.2 °C).

Autumn

Early Autumn sees a slight reduction in relative humidity levels, but daytime temperatures remain warm into late October. Abrupt but short-lived cold snaps are common. Late Autumn is rainier and colder, with December on average recording the most rain of any month. Fall foliage becomes especially vibrant after the first frost, typically November, and lasts until early December. The average last 90 °F (32 °C)+ high of the warm season falls on September 22, while the average first freeze of autumn falls on November 14, yielding a growing season of 240 days.[9]

Winter

Winters are mild, but cold snaps can occur; on average there are 47 days annually with a low at or below freezing, and 4.7 days with a high at or below freezing. The official all-time record low temperature was −13 °F (−25 °C), which occurred on December 24, 1963, while the lowest daily maximum temperature on record is 6 °F (−14 °C) on January 10, 1962; the coldest month on record was January 1918 with an average of 27.6 °F (−2.4 °C). However, from December to February, there is an average of 6.3 days of 70 °F (21 °C)+ highs. Snowfall is not abundant but does occur during most winters, with a seasonal average of 3.8 in (9.7 cm) at the airport. Snowfall has ranged from zero in the three consecutive winters ending in 1947−48 to 25.1 in (64 cm) in 1917−18. Although March is a transition month, the largest daily snowfall was 18.0 in (46 cm) on March 17, 1892.[9] The most significant snow in many years fell on March 8, 2008 when 7 inches blanketed the city. While severe weather is more common in Spring, notable severe weather has occurred in winter. On February 5, 2008 a tornado killed 3 in Memphis during the 2008 Super Tuesday tornado outbreak.

Monthly normals and record temperatures

Sister cities

Memphis has two sister cities, as designated by Sister Cities International:

Landmarks

Notes

  1. ↑ On the warm end, 1928, 1929 and 1940 were discounted due to missing data in at least one month in each of those years.[9]
  2. ↑ The annual number of 90 °F+ days has ranged from 19 in 1906 to 109 in 1954; the summer of 1980 saw 33 days of 100 °F+ temperatures.

References

  1. ↑ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
  2. ↑ http://www.shelbycountytn.gov/DocumentCenter/Home/View/3671
  3. ↑ The Village Memphis Website
  4. ↑ Memphis Light, Gas, and Water Website – About Our Services
  5. ↑ L. Yu Lin, PhD, P.E, Drinking Water from Wells, Not From the River
  6. ↑ MLGW – 2005 Water Quality Table
  7. ↑
  8. 1 2 "WMO Climate Normals for MEMPHIS/WSCMO AP TN 1961–1990". National Oceanic and Atmospheric Administration. Retrieved 2014-03-10.
  9. 1 2 3 4 5 6 7 "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved 2014-05-13.
  10. ↑ Official records for Memphis were kept at downtown from January 1872 to December 1939 and at Memphis Int'l since January 1940.NCDC-NOAA (2015). "ThreadEx [Long-Term Station Extremes for America], Version 10.1, released 2 April 2015". Ithaca, NY, USA: Northeast Regional Climate Center (NRCC, Keith Eggleston) and National Oceanic and Atmospheric Administration (NOAA, Bryant Korzeniewski). Retrieved 2 December 2015.
  11. ↑ "Climate Normals and Records - National Weather Service Memphis, TN". National Weather Service. Retrieved 2012-01-09.
  12. ↑ "Station Name: TN MEMPHIS INTL AP". National Oceanic & Atmospheric Administration. Retrieved 2014-03-28.
  13. ↑ "Average Percent Sunshine through 2009". National Climatic Data Center. Retrieved 2012-11-16.
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