An outflow boundary from overnight storms combined with a very moist and unstable airmass in place over the region, along with warm afternoon temperatures, to cause showers and thunderstorms. Some of these storms brought damaging winds to the region.
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 JAN wrote it up.
An outflow boundary from overnight storms combined with a very moist and unstable airmass in place over the region, along with warm afternoon temperatures, to cause showers and thunderstorms. Some of these storms brought damaging winds to the region.
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 Jackson, MS wrote its last area forecast discussion before the first event at Jul 1, 3:22 PM CST, 38 minutes earlier.
Area Forecast Discussion National Weather Service Jackson MS 422 PM CDT Sat Jul 1 2017 .DISCUSSION... Tonight and Tomorrow: Microburst parameters were decent for this afternoon and with a shortwave approaching, the risk for a few severe may continue overnight. PW values near 2 inches should yield more torrential downpours and localized flooding in poor drainage areas. Based on previous runs and current trends it looks like things are developing like expected. Earlier higher res models suggested a break this evening and redevelopment late tonight, based on current trends not really thinking there will be a big lag. Also not sure if storms will go overnight into Sunday, since activity was already going to the west and will likely be in the area well before midnight. A retrograding surface ridge may limit convection over the far southwest zones, but does not do much to change the airmass in the short term or really help to push the boundary out of the area. The ECMWF and GFS both show the wave to the west get stalled and not move through until Sunday afternoon, maintaining rain chances over a larger area. Went with a blend and kept much of the rain in the north. The higher res output was generally dry for tomorrow. Tweaked the pops but stuck with guidance temps. Near 90 still seems good for tomorrow. /7/ Sunday night through next Saturday: Hot and humid conditions with diurnal storm chances will remain through the July 4th holiday and through the week. By Sunday, that trough and surface low over the northern Great Lakes will have ejected into eastern Canada. The cold front will be draped across the Appalachians into the mid-Mississippi Valley with strong surface ridging extending through that area. In addition, surface and mid-level ridging will be situated over the Gulf of Mexico with nearly 590-595DM 500mb heights. Models show some of this surface ridging and slightly drier air advecting in from the south towards Lake Charles and into the southwest towards Natchez and the southwestern periphery of northeast Louisiana. This should limit convection chances there while elsewhere nearly an inch and three quarters to nearly 2 inch PWs will reside. With plenty of moisture, bumped up PoPs into likely from a line near Fountain Hill, Arkansas towards Quitman, MS and north. There could be some stronger to possibly severe wet microbursts given steeper lapse rates reflected by upper 20s vertical totals and some modest flow. There isn't as defined of a shortwave and trough/front as is the case today but there could be some potential. Will monitor the trends and may have to introduce something in later forecasts for possible isolated severe storm potential. In addition, slow moving storms and high levels of moisture could torrential downpours and a localized flood threat. As the ridge builds to our west-southwest by the start of the week, low-mid level height (700mb and 850mb) and temperature anomalies will increase. This will lead to some drying in areas to the western zones while areas to the east convection chances will linger through mid-week. Expect diurnal thunderstorm chances with lingering microburst potential through the week, especially over eastern areas. The most impactful weather looks to be the heat as temperatures will be in the low-mid 90s with dewpoints in the mid 70s. This will lead to increasing oppressive conditions, especially Monday through Thursday. Very confident this will be a concern along and west of the I-55 corridor with a little less confidence in the east due to increasing coverage of convection. Any areas on the periphery of any storm could be quite oppressive. Have continued the heat threat in the HWO/graphics. Expect hot and humid conditions to continue with slightly cooler temperatures as a shortwave trough ejects through the mid- Mississippi Valley. This in addition to an extremely anomalously strong ridge over the Rockies will amplify the upper trough and bring NW flow and a cold front down towards the area by late week into early next weekend. Hopefully this will help temper down our oppressive heat stress concerns. /DC/EC/ && .AVIATION... 18Z TAF discussion: Scattered to numerous showers and thunderstorms are expected again this afternoon, with most of the activity diminishing in the early evening. Models continue to show a disturbance passing to the northwest of the cwa with convection blowing up the nw portions of the area and spreading east along the highway 82 corridor. Again, the higher resolution models may be over doing it, but decided to add showers and thunderstorms around 6z for GLH, 8z for GWO and after 12z for GTR Sunday morning. Looks like there could be more stratus tonight, so showed lower ceilings starting around 10z elsewhere. Low clouds could move in a littler earlier. && .PRELIMINARY POINT TEMPS/POPS... Jackson 74 90 72 93 / 19 27 19 17 Meridian 73 90 72 92 / 20 36 25 29 Vicksburg 74 91 72 93 / 20 31 8 10 Hattiesburg 75 93 72 93 / 21 25 14 26 Natchez 73 90 72 92 / 19 16 8 10 Greenville 74 90 74 92 / 31 37 22 22 Greenwood 73 89 72 92 / 28 39 25 32 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. &&
Hazardous Weather Outlook National Weather Service Jackson MS 226 PM CDT Sat Jul 1 2017 ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-021930- Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland- Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar- Sunflower-Leflore-Grenada-Carroll-Montgomery-Webster-Clay-Lowndes- Choctaw-Oktibbeha-Washington-Humphreys-Holmes-Attala-Winston- Noxubee-Issaquena-Sharkey-Yazoo-Madison MS-Leake-Neshoba-Kemper- Warren-Hinds-Rankin-Scott-Newton-Lauderdale-Claiborne-Copiah- Simpson-Smith-Jasper-Clarke-Jefferson-Adams-Franklin MS-Lincoln- Lawrence-Jefferson Davis-Covington-Jones- 226 PM CDT Sat Jul 1 2017 This hazardous weather outlook is for portions of southeast Arkansas, northeast Louisiana, central Mississippi, north central Mississippi, and south central Mississippi. .DAY ONE...Tonight and Sunday SEVERE THUNDERSTORMS THREAT...Marginal TIMING...The rest of this afternoon through tonight Strong to severe storms will be possible through tonight. Damaging wind gusts to 60 mph and quarter sized hail will be the primary risks. Torrential rains may lead to localized flooding. (www.weather.gov/images/jan/graphicast/image1.png) .DAYS TWO THROUGH SEVEN...Sunday night through Friday Humid conditions and increasing temperatures may cause heat index values to peak near 105 degrees each afternoon through mid week. (www.weather.gov/images/jan/graphicast/image2.png) .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations may be needed for portions of the region remainder of the afternoon through tonight. MSZ072>074-021930- Marion-Lamar-Forrest- 226 PM CDT Sat Jul 1 2017 This hazardous weather outlook is for portions of south central Mississippi, and southeast Mississippi. .DAY ONE...Tonight and Sunday SEVERE THUNDERSTORMS THREAT...Marginal TIMING...Through the remainder of this afternoon and evening Strong to severe storms will be possible through this evening. Damaging wind gusts to 60 mph and quarter sized hail will be the primary risks. Torrential rains may lead to localized flooding. (www.weather.gov/images/jan/graphicast/image1.png) .DAYS TWO THROUGH SEVEN...Sunday night through Friday Humid conditions and increasing temperatures may cause heat index values to peak near 105 degrees each afternoon through mid week. (www.weather.gov/images/jan/graphicast/image2.png) .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations may be needed for portions of the region remainder of the afternoon. 21 && ...HAZARD LEGEND... *SEVERE THUNDERSTORMS* High...Significant severe thunderstorms are expected. Moderate...Severe storms expected with significant severe weather possible. Enhanced...Severe storms expected. Slight...Severe storms possible. Marginal...Isolated severe storms possible. ...USEFUL WEATHER WEB PAGES (URLS)... NWS JAN Home page... www.weather.gov/jan Stay Aware, Stay Safe NWS JAN Briefing Page... www.weather.gov/jan/safe Latest Weather Briefing... www.weather.gov/jan/weather_briefing Tropical page... www.weather.gov/jan/tropical National Hurricane Center Home Page... www.nhc.noaa.gov/ Find NWS JAN on Facebook... www.facebook.com/NWSJacksonMS Follow NWS JAN on Twitter... @NWSJacksonMS Follow NWS JAN on Youtube... www.youtube.com/user/NWSJacksonMiss ...ADDITIONAL URLS FOR SEVERE WEATHER ISSUES... Storm Prediction Center (SPC)... www.spc.noaa.gov/ Meso Analysis... www.spc.noaa.gov/exper/mesoanalysis/ Day 1 through 3 Outlooks... www.spc.noaa.gov/products/outlook/ Storm Reports... www.spc.noaa.gov/climo/online/
Special Weather Statement
National Weather Service Jackson MS
350 PM CDT SAT JUL 1 2017
MSZ028-029-032-012115-
Montgomery MS-Choctaw MS-Webster MS-
350 PM CDT SAT JUL 1 2017
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN CHOCTAW...
SOUTHWESTERN WEBSTER AND CENTRAL MONTGOMERY COUNTIES UNTIL 415 PM
CDT...
At 350 PM CDT, Meteorologists were tracking a strong thunderstorm
near Lodi, or 16 miles east of Winona, moving east at 25 mph.
Nickel size hail and winds in excess of 40 mph will be possible with
this storm.
This strong thunderstorm will be near...
Eupora around 410 PM CDT.
Other locations impacted by this storm include Walthall.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3366 8926 3333 8927 3338 8965 3340 8965
3340 8972 3342 8972 3359 8970
TIME...MOT...LOC 2050Z 270DEG 22KT 3348 8944
17Special Weather Statement National Weather Service Jackson MS 405 PM CDT SAT JUL 1 2017 MSZ040-041-012130- Sharkey MS-Issaquena MS- 405 PM CDT SAT JUL 1 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL ISSAQUENA AND WESTERN SHARKEY COUNTIES UNTIL 430 PM CDT... At 404 PM CDT, Meteorologists were tracking a strong thunderstorm near Rolling Fork, moving east at 25 mph. Dime size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Rolling Fork around 420 PM CDT. Anguilla around 430 PM CDT. Other locations impacted by this storm include Cary. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3276 9103 3291 9104 3301 9081 3273 9075 TIME...MOT...LOC 2104Z 257DEG 21KT 3284 9096 17
Special Weather Statement National Weather Service Jackson MS 409 PM CDT SAT JUL 1 2017 MSZ018-019-012145- Sunflower MS-Bolivar MS- 409 PM CDT SAT JUL 1 2017 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL SUNFLOWER AND SOUTHEASTERN BOLIVAR COUNTIES UNTIL 445 PM CDT... At 409 PM CDT, Meteorologists were tracking a strong thunderstorm near Boyle, or near Cleveland, moving east at 25 mph. Dime size hail and winds in excess of 40 mph will be possible with this storm. This strong thunderstorm will be near... Cleveland and Boyle around 415 PM CDT. Renova around 420 PM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. && LAT...LON 3360 9083 3376 9089 3388 9059 3361 9059 TIME...MOT...LOC 2109Z 257DEG 21KT 3370 9078 17
Special Weather Statement
National Weather Service Jackson MS
413 PM CDT SAT JUL 1 2017
LAZ007-012145-
Morehouse LA-
413 PM CDT SAT JUL 1 2017
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN MOREHOUSE PARISH
UNTIL 445 PM CDT...
At 413 PM CDT, Meteorologists were tracking a strong thunderstorm
near Bastrop, moving east at 25 mph.
Dime size hail and winds in excess of 40 mph will be possible with
this storm.
This strong thunderstorm will be near...
Bastrop around 420 PM CDT.
Beekman around 435 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3299 9182 3273 9179 3275 9205 3279 9206
3280 9205 3281 9206 3284 9207 3284 9206
3285 9207 3290 9208
TIME...MOT...LOC 2113Z 257DEG 20KT 3283 9200
17Special Weather Statement
National Weather Service Jackson MS
423 PM CDT SAT JUL 1 2017
MSZ037-044-045-012200-
Neshoba MS-Attala MS-Leake MS-
423 PM CDT SAT JUL 1 2017
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN LEAKE...
SOUTHEASTERN ATTALA AND NORTHWESTERN NESHOBA COUNTIES UNTIL 500 PM
CDT...
At 423 PM CDT, Meteorologists were tracking a strong thunderstorm
over Renfroe, or 8 miles northwest of Edinburg, moving northeast at
30 mph.
Dime size hail and winds in excess of 40 mph will be possible with
this storm.
This strong thunderstorm will be near...
Zama around 440 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3275 8948 3291 8959 3306 8935 3300 8932
3293 8932 3293 8928 3281 8921
TIME...MOT...LOC 2123Z 240DEG 26KT 3288 8946
17Special Weather Statement
National Weather Service Jackson MS
458 PM CDT SAT JUL 1 2017
MSZ038-012230-
Winston MS-
458 PM CDT SAT JUL 1 2017
...A STRONG THUNDERSTORM WILL AFFECT WINSTON COUNTY UNTIL 530 PM
CDT...
At 458 PM CDT, Meteorologists were tracking a strong thunderstorm
near Center Ridge, or 8 miles southwest of Louisville, moving
northeast at 35 mph.
Winds in excess of 40 mph will be possible with this storm.
This strong thunderstorm will be near...
Louisville around 515 PM CDT.
Millcreek around 525 PM CDT.
Other locations impacted by this storm include Noxapater.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3293 8932 3310 8932 3311 8930 3311 8922
3316 8921 3320 8915 3320 8911 3323 8911
3328 8902 3293 8882
TIME...MOT...LOC 2158Z 241DEG 29KT 3304 8917
17The Jackson/Brandon,MS radar (KDGX), 179 km away, was scanning. The volume nearest the first event began at 22:00 UTC.
1 thunderstorm wind. Local standard time, as filed.
Several trees were blown down along Highway 165.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2017Every state in 2017This day in weather historyWarnings in Louisiana, July 2017
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: 697426.