Slow-moving thunderstorms developed along an outflow boundary across West Tennessee, near the Tennessee River, and Northeast Mississippi during the early morning hours on July 1, 2020. Some locations picked up more than 8 inches of rain.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MEG wrote it up.
Slow-moving thunderstorms developed along an outflow boundary across West Tennessee, near the Tennessee River, and Northeast Mississippi during the early morning hours on July 1, 2020. Some locations picked up more than 8 inches of rain. Meanwhile, a mesoscale convective system that developed over Southeast Nebraska and Northwest Missouri earlier in the day raced southeast and moved through the Mid-South during the afternoon and early evening hours with more heavy rain and isolated wind damage.
The local office's own words before the first event, 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 the first event at Jun 30, 10:52 PM CST, 3 hours 8 minutes earlier.
Area Forecast Discussion National Weather Service Memphis TN 1152 PM CDT Tue Jun 30 2020 .UPDATE... Aviation Update Below && .PREV DISCUSSION... /issued 909 PM CDT Tue Jun 30 2020/ UPDATE... Storms across West Tennessee are becoming outflow dominate this evening and have lost energy from daytime heating. As a result expect accelerated weakening over the next few hours. Temperatures have cooled into the low 70s where substantial rain has fallen with low 80s across most of the Midsouth. 30 PREV DISCUSSION... /issued 640 PM CDT Tue Jun 30 2020/ UPDATE... Aviation Update Below PREV DISCUSSION... /issued 340 PM CDT Tue Jun 30 2020/ DISCUSSION... GOES-16 Satellite trends place a low over Illinois, with a weak shortwave slowly advances eastward towards the Missouri Bootheel. KNQA/Regional WSR- 88D radar trends indicate isolated showers near the Missouri Bootheel and over West Tennessee near the Tennessee River. The atmosphere is decently moist with PWAT values nearing 2 inches. Surface instability is a whopping 5000 J/kg with minimal deep layer sheer. With that being said a stronger storm or two will be possible through this afternoon and the aforementioned moisture parameters suggests a localized flood risk as well. Short term models including Convective Allowing Model Solutions (CAMs) indicate the potential for scattered showers and thunderstorms to develop through the rest of this afternoon into this evening. By this evening, an MCS just to our north will push through west Tennessee will begin to decay. A few strong thunderstorms containing gusty winds, and localized heavy rainfall will be possible as the MCS moves through. There is also the potential for another MCS to develop during the overnight hours across the Midwest which then the remnants could impact our area by Wednesday. By tomorrow night into Thursday a back door cold front will push through the Mid- South allowing for more convection through the end of the week. Temperatures will stay in the upper 80s to lower 90s through the weekend. Unfortunately, heat indices will around 102-105F with with tomorrow forecasted to have the highest heat indices. Dewpoint temperatures will generally be in the upper 70s. Confidence is still a bit messy after Friday into the weekend. There will be some upper level energy that dives south towards the Gulf on Thursday, which sits there for a few days and eventually organizes into a closed upper low. Models are a bit more consistent now that moisture will pinwheel back into our area as the low forms. Have kept keep PoPs low at this time since most of the dynamics will be focused to our south. We will continue to monitor. SGW && .AVIATION... 06Z TAF Scattered showers and thunderstorms will be the theme through this TAF cycle. VFR conditions however with the storms and showers MVFR/IFR conditions can be expected. Winds 5-10kts with some gusts to 20kts expected. SMW && .MEG WATCHES/WARNINGS/ADVISORIES... AR...None. MO...None. MS...None. TN...None. &&
Hazardous Weather Outlook National Weather Service Memphis TN 347 AM CDT Tue Jun 30 2020 ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017- 020>024-TNZ001>004-019>022-048>055-088>092-011215- 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- 347 AM CDT Tue Jun 30 2020 This hazardous weather outlook is for portions of East Arkansas... the Missouri Bootheel...North Mississippi...and West Tennessee. .DAY ONE...Today and Tonight Strong to severe thunderstorms will be possible across the Mid-South this afternoon into the overnight hours. Damaging winds and localized flash flooding will be possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Strong to severe storms will be possible across the Mid-South on Wednesday. Damaging winds and localized flash flooding will be possible. Heat indices of 105 to 108 degrees will be possible Thursday portions of East-Central Arkansas and Northwest Mississippi. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time. KRM
Special Weather Statement
National Weather Service Memphis TN
951 PM CDT Tue Jun 30 2020
TNZ054-055-091-092-010330-
Henderson TN-Decatur TN-McNairy TN-Hardin TN-
951 PM CDT Tue Jun 30 2020
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 1030 PM CDT
FOR...
Southeastern Henderson County in western Tennessee...
Southern Decatur County in western Tennessee...
East central McNairy County in western Tennessee...
Hardin County in western Tennessee...
At 950 PM CDT...a strong thunderstorm producing pea size hail or
larger and winds at least 40 mph was located near Savannah, moving
east at 20 mph.
Very heavy rain along with continuous cloud to ground lightning are
also possible with this thunderstorm.
People in southeastern Henderson...southern Decatur...east central
McNairy and Hardin Counties should monitor this storm closely.
LAT...LON 3539 8799 3539 8803 3537 8803 3535 8800
3533 8802 3530 8802 3529 8798 3510 8799
3510 8842 3538 8837 3540 8835 3542 8836
3549 8835 3548 8799 3547 8803 3544 8804
3543 8803 3541 8797
TIME...MOT...LOC 0250Z 277DEG 17KT 3527 8824Special Weather Statement
National Weather Service Memphis TN
1141 PM CDT Tue Jun 30 2020
MSZ005-006-009-010530-
Tishomingo MS-Alcorn MS-Prentiss MS-
1141 PM CDT Tue Jun 30 2020
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 1230 AM CDT
FOR...
Tishomingo County in northeastern Mississippi...
Southeastern Alcorn County in northeastern Mississippi...
Eastern Prentiss County in northeastern Mississippi...
At 1140 PM CDT...a strong thunderstorm producing winds at least 40
mph was located over Burnsville, or near Iuka, moving south at 25
mph.
Very heavy rain along with continuous cloud to ground lightning are
also possible with this thunderstorm.
People in Tishomingo...southeastern Alcorn and eastern Prentiss
Counties should monitor this storm closely.
LAT...LON 3450 8815 3449 8844 3483 8845 3489 8812
3479 8811
TIME...MOT...LOC 0440Z 347DEG 19KT 3481 8831Special Weather Statement
National Weather Service Memphis TN
1212 AM CDT Wed Jul 1 2020
TNZ090-091-010545-
Hardeman TN-McNairy TN-
1212 AM CDT Wed Jul 1 2020
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 1245 AM CDT
FOR...
Southeastern Hardeman County in western Tennessee...
Southwestern McNairy County in western Tennessee...
At 1212 AM CDT...a strong thunderstorm producing winds at least 40
mph was located near Pocahontas, or near Big Hill Pond State Park,
moving east at 35 mph.
Very heavy rain along with continuous cloud to ground lightning are
also possible with this thunderstorm.
People in southeastern Hardeman and southwestern McNairy Counties
should monitor this storm closely.
LAT...LON 3500 8880 3506 8891 3523 8883 3514 8854
3500 8843
TIME...MOT...LOC 0512Z 291DEG 31KT 3512 8879
MJPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEMPHIS TN
1220 AM CDT WED JUL 01 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1215 AM HEAVY RAIN PITTSBURG LANDING 35.16N 88.32W
07/01/2020 M3.98 INCH HARDIN TN MESONET
3.98 INCHES OF RAIN HAS FALLEN AT THE SHILOH RAWS IN
THE PAST 3 HOURS.
&&
MJSpecial Weather Statement
National Weather Service Memphis TN
1236 AM CDT Wed Jul 1 2020
MSZ006-009-017-010600-
Itawamba MS-Tishomingo MS-Prentiss MS-
1236 AM CDT Wed Jul 1 2020
...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 100 AM CDT
FOR...
Northern Itawamba County in northeastern Mississippi...
Southern Tishomingo County in northeastern Mississippi...
Prentiss County in northeastern Mississippi...
At 1235 AM CDT...a strong thunderstorm producing winds in excess of
40 mph was located near Thrashers, or 7 miles southeast of
Booneville, moving southeast at 40 mph.
Very heavy rain along with continuous cloud to ground lightning are
also possible with this thunderstorm. Downed tree branches could
result in scattered power outages.
People in northern Itawamba...southern Tishomingo and Prentiss
Counties should monitor this storm closely.
LAT...LON 3437 8817 3434 8827 3441 8849 3475 8860
3476 8831 3455 8815
TIME...MOT...LOC 0535Z 330DEG 34KT 3462 8845
MJSpecial Weather Statement National Weather Service Memphis TN 1258 AM CDT Wed Jul 1 2020 MSZ017-024-010645- Itawamba MS-Monroe MS- 1258 AM CDT Wed Jul 1 2020 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 145 AM CDT FOR... Itawamba County in northeastern Mississippi... Northeastern Monroe County in northeastern Mississippi... At 1257 AM CDT...a strong thunderstorm producing winds at least 40 mph was located near Fulton, moving southeast at 35 mph. Very heavy rain along with continuous cloud to ground lightning are also possible with this thunderstorm. Damage to tree limbs could result in scattered power outages. People in Itawamba and northeastern Monroe Counties should monitor this storm closely. LAT...LON 3390 8823 3398 8855 3447 8854 3446 8816 TIME...MOT...LOC 0557Z 335DEG 28KT 3428 8832 MJ
The Columbus AFB radar (KGWX), 141 km away, was scanning. The volume nearest the first event began at 08:00 UTC.
7 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Significant flooding near the intersection of Highway 69 and Highway 226.
Christmasville Road was completely washed out between Oakfield and Watson Roads. Up to one foot of water covered Christmasville Road near Bermuda Road and Northeast Middle School.
Highway 45 is closed at Ozier Road near Pinson due to flooding.
Part of the road in the 800 block of Simmons Road caved in. The road was closed to all traffic.
A levee broke outside of Selmer toward Purdy which, when combined with very heavy rainfall of up to eight inches, resulted in widespread flash flooding. Twenty people were rescued. Ten homes and 50 businesses were flooded and damaged. Roads and bridges were also damaged.
Several feet of water covered Forty Forks Road near Bethel Springs.
State Route 198 closed in both directions between Hillcrest Circle Drive and Paul Coffman Drive due to flooding.
Trees and powerlines were knocked down south of Millington from South Lucy Road to Pleasant Ridge Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2020Every state in 2020This day in weather historyWarnings in Tennessee, July 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 909450, 909455, 909460, 909476, 909480, 909478, 909462, 909688.