Alert archive / Tennessee / Dense Fog Advisories in 2021
Dense Fog Advisory 9, NWS Memphis, TN
NWS Memphis, TN issued this dense fog advisory at Jul 24, 2021, 4:51 AM CDT for 9 counties in Mississippi; 17 counties in Tennessee; Clay County, Arkansas. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 24, 2021, 4:51 AM CDT (09:51 UTC)
- Expired
- Jul 24, 2021, 7:41 AM CDT
- In force
- 3 hr
- Issued by
- NWS Memphis, TN
All 27 counties
Clay County, AR, Alcorn County, MS, Benton County, MS, Itawamba County, MS, Lee County, MS, Monroe County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 99 km from the middle of the area, began a volume at 09:55 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Little Rock, AR (KLZK), launched 00:00Z, 9.9 hours before the alert went out and 124 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 835 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1427 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- -5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Memphis, TN wrote its last area forecast discussion before this dense fog advisory went out at Jul 24, 4:27 AM CDT, 24 minutes earlier.
Area forecast discussion, Jul 24, 4:27 AM CDT, 24 minutes before
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</html>Hazardous weather outlook, Jul 24, 4:36 AM CDT, 15 minutes before
Hazardous Weather Outlook National Weather Service Memphis TN 436 AM CDT Sat Jul 24 2021 ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017- 020>024-TNZ001>004-019>022-048>055-088>092-251145- Alcorn-Benton MS-Benton TN-Calhoun-Carroll-Chester-Chickasaw-Clay- Coahoma-Craighead-Crittenden-Crockett-Cross-DeSoto-Decatur- Dunklin-Dyer-Fayette-Gibson-Greene-Hardeman-Hardin-Haywood- Henderson-Henry-Itawamba-Lafayette-Lake-Lauderdale-Lee AR-Lee MS- Madison-Marshall-McNairy-Mississippi-Monroe-Obion-Panola-Pemiscot- Phillips-Poinsett-Pontotoc-Prentiss-Quitman-Shelby-St. Francis- Tallahatchie-Tate-Tippah-Tipton-Tishomingo-Tunica-Union-Weakley- Yalobusha- 436 AM CDT Sat Jul 24 2021 This hazardous weather outlook is for portions of East Arkansas... the Missouri Bootheel...North Mississippi...and West Tennessee. .DAY ONE...Today and Tonight A Heat advisory is in effect from 11 AM to 7 PM for portions of northwest Mississippi, west Tennessee and east Arkansas. Heat index values will be near 105 this afternoon. .DAYS TWO THROUGH SEVEN...Sunday through Friday Hot and humid conditions will stretch through the week, with heat index values in the triple digits. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time. SMW
In the hours before
Special weather statement, Jul 24, 3:18 AM CDT, 1 hour 33 minutes before
Special Weather Statement National Weather Service Memphis TN 318 AM CDT Sat Jul 24 2021 ARZ009-018-028-036-MOZ113-115-MSZ001>017-020>024-TNZ001>004- 019>022-048>055-088>092-241230- Clay-Greene-Mississippi-Crittenden-Dunklin-Pemiscot-DeSoto- Marshall-Benton MS-Tippah-Alcorn-Tishomingo-Tunica-Tate-Prentiss- Coahoma-Quitman-Panola-Lafayette-Union-Pontotoc-Lee MS-Itawamba- Tallahatchie-Yalobusha-Calhoun-Chickasaw-Monroe-Lake-Obion- Weakley-Henry-Dyer-Gibson-Carroll-Benton TN-Lauderdale-Tipton- Haywood-Crockett-Madison-Chester-Henderson-Decatur-Shelby-Fayette- Hardeman-McNairy-Hardin- Including the cities of Piggott, Corning, Paragould, Blytheville, West Memphis, Kennett, Caruthersville, Southaven, Olive Branch, Holly Springs, Ashland, Ripley MS, Corinth, Iuka, Tunica, Senatobia, Booneville, Clarksdale, Marks, Batesville, Oxford, New Albany, Pontotoc, Tupelo, Fulton, Charleston, Water Valley, Coffeeville, Bruce, Calhoun City, Houston, Okolona, Amory, Aberdeen, Tiptonville, Union City, Martin, Dresden, Paris, Dyersburg, Humboldt, Milan, Huntingdon, Camden, Ripley TN, Covington, Brownsville, Alamo, Jackson, Henderson, Lexington, Parsons, Decaturville, Bartlett, Germantown, Collierville, Memphis, Millington, Somerville, Oakland, Bolivar, Selmer, and Savannah 318 AM CDT Sat Jul 24 2021 ...Patchy Dense Fog Early This Morning... Patchy, dense fog will affect portions of the Mid-South through the early morning hours, resulting in hazardous travel conditions on area roads. Visibility will range from 2 to 4 miles in many areas, but may be locally reduced to 1/2 mile or less at times, especially near lakes, rivers, or other sources of moisture. Motorists are advised to exercise caution on area roadways due to the potential for rapidly changing visibility. MJ
The office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 4:13 AM CDT | Heat Advisory | MEG | Coahoma, DeSoto, Panola, Quitman, Tallahatchie, Tate and 1 more | 15 hr |
| Jul 24, 2:24 PM CDT | Heat Advisory | MEG | Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more | 29 hr |
Nearby
Dense Fog Advisories in Tennessee, 2021Dense Fog Advisories in Mississippi, 2021Dense Fog Advisories in Arkansas, 2021Every dense fog advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.