A moist airmass remained in place across the ArkLaMiss during mid-August. A stalled front allowed for a good coverage of showers and thunderstorms across the area.
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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.
A moist airmass remained in place across the ArkLaMiss during mid-August. A stalled front allowed for a good coverage of showers and thunderstorms across the area. These resulted in flash flooding for several locations as a strong upper level disturbance also moved through 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 Aug 14, 5:58 AM CST, 17 minutes earlier.
Area Forecast Discussion National Weather Service Jackson MS 658 AM CDT Mon Aug 14 2017 .UPDATE... Updated for 12Z aviation discussion && .AVIATION... 12Z TAF discussion: Aside from a few patchy areas of fog and low stratus this morning, the main concern for aviation hazards will be for convection, especially in the GLH/GWO area today. Convective trends should be on the decrease as we go into the evening hours. /EC/ && .DISCUSSION... Today through tonight: Broad mid-level troughing continues over the ArkLaMiss, along with a weak frontal boundary that extends across the northern portion of the area. A few thunderstorms are moving along this boundary this morning, and expect this activity to continue through the morning hours. This boundary will continue to be the focus of the bulk of thunderstorm development today, generally along the Highway 82 corridor. Will continue to highlight this area for a limited risk of flash flooding, as the greatest potential for flooding will continue to be near the boundary. For the remainder of the area, precipitable water continues to be well above two inches again, so expect scattered, diurnal thunderstorm activity. High temperatures will range from the mid 80s in the north to the low 90s in south this afternoon. Showers and thunderstorm will continue to be possible near the boundary overnight as it remains over the northern portions of the area. Another muggy night will prevail with lows in the mid 70s. /15/ Tuesday through Sunday: After an unseasonably long stretch of contending with the southward displaced westerlies and associated heavy convective precipitation over the ArkLaMiss, it appears we will see the pattern become more summer-like as the subtropical ridge shifts northward across the Gulf Coast states. Plenty of moisture will remain in the area, but weakening flow and decreasing lift/convergence should make thunderstorm activity more disorganized and diurnal in nature, especially for Wed through Friday. Going into the weekend, a shortwave trough crossing the mid MS valley region is forecast to briefly suppress the ridge with a weakness developing over the ArkLaMiss, and this could help to increase diurnal convective chances before heights rise again next week. Temperatures may increase to above normal values given the increasing ridge influence. /EC/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 90 74 90 74 / 46 27 41 17 Meridian 91 74 89 74 / 47 28 43 15 Vicksburg 90 75 90 75 / 43 23 35 9 Hattiesburg 93 75 90 74 / 53 25 54 19 Natchez 90 74 89 74 / 43 23 45 13 Greenville 87 74 89 75 / 81 43 46 8 Greenwood 86 74 88 74 / 80 45 47 10 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. &&
Hazardous Weather Outlook National Weather Service Jackson MS 508 AM CDT Mon Aug 14 2017 ARZ074-075-MSZ018-019-025>036-151015- Ashley-Chicot-Bolivar-Sunflower-Leflore-Grenada-Carroll- Montgomery-Webster-Clay-Lowndes-Choctaw-Oktibbeha-Washington- Humphreys-Holmes- 508 AM CDT Mon Aug 14 2017 This hazardous weather outlook is for portions of southeast Arkansas, central Mississippi, and north central Mississippi. .DAY ONE...Today and Tonight FLOODING THREAT...Limited TIMING...Today through Tonight Thunderstorms with heavy rainfall moving across saturated soils could bring localized flash flooding today into tonight. (www.weather.gov/images/jan/graphicast/image1.png) .DAYS TWO THROUGH SEVEN...Tuesday through Sunday An additional threat for localized flash flooding will continue Tuesday. (www.weather.gov/images/jan/graphicast/image1.png) .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations is not expected through next Sunday. LAZ007>009-015-016-023>026-MSZ037>066-072>074-151015- Morehouse-West Carroll-East Carroll-Richland-Madison LA- Franklin LA-Catahoula-Tensas-Concordia-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-Marion-Lamar-Forrest- 508 AM CDT Mon Aug 14 2017 This hazardous weather outlook is for portions of northeast Louisiana, central Mississippi, and south central Mississippi. .DAY ONE...Today and Tonight The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday The probability for widespread hazardous weather is low. .SPOTTER CALL TO ACTION STATEMENT... The activation of storm spotters, HAM radio operators, and emergency management personnel in support of severe weather operations is not expected through next Sunday. 21 && ...HAZARD LEGEND... *FLOODING* Extreme...Confident in significant flooding. Significant...Significant flooding possible. Elevated...Confident in flooding. Limited...Flooding 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 FLOODING ISSUES... Current Watches and Warnings... www.weather.gov/jan/safe_HeavyRain Observed Precipitation Images... www.weather.gov/jan/precipmaps River Forecast Center... www.weather.gov/lmrfc/ Significant River Flood Outlook... www.wpc.ncep.noaa.gov/nationalfloodoutlook/index.html Day 1 through 3 Excessive Rainfall... www.wpc.ncep.noaa.gov/qpf/excess_rain.shtml Excessive Rainfall Discussion... www.wpc.ncep.noaa.gov/discussions/qpferd.html Day 1 through 7 QPF... www.wpc.ncep.noaa.gov/qpf/qpf2.shtml QPF Discussion... www.wpc.ncep.noaa.gov/discussions/qpfpfd.html
Special Weather Statement
National Weather Service Jackson MS
624 AM CDT MON AUG 14 2017
ARZ075-141215-
Chicot AR-
624 AM CDT MON AUG 14 2017
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN CHICOT COUNTY UNTIL
715 AM CDT...
At 624 AM CDT, Meteorologists were tracking a strong thunderstorm
near Dermott, moving east at 10 mph.
Winds in excess of 40 mph will be possible with this storm.
This strong thunderstorm will be near...
Dermott around 640 AM 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.
Seek safe shelter inside a building or vehicle.
&&
LAT...LON 3352 9135 3353 9133 3352 9132 3352 9125
3343 9124 3344 9145 3356 9145 3356 9135
TIME...MOT...LOC 1124Z 265DEG 8KT 3355 9150
ECSpecial Weather Statement
National Weather Service Jackson MS
711 AM CDT MON AUG 14 2017
MSZ018-019-141300-
Sunflower MS-Bolivar MS-
711 AM CDT MON AUG 14 2017
...A STRONG THUNDERSTORM PRODUCING HEAVY RAINFALL WILL AFFECT
CENTRAL SUNFLOWER AND SOUTHEASTERN BOLIVAR COUNTIES UNTIL 800 AM
CDT...
At 710 AM CDT, Meteorologists were tracking a strong thunderstorm
near Ruleville, moving east at 55 mph.
Winds in excess of 40 mph will be possible with this storm.
This strong thunderstorm will be near...
Drew around 715 AM CDT.
Other locations impacted by this storm include Doddsville, Beulah,
Pace and Merigold.
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.
&&
LAT...LON 3361 9046 3353 9077 3353 9112 3368 9103
3376 9101 3378 9099 3379 9099 3394 9045
TIME...MOT...LOC 1210Z 264DEG 49KT 3377 9060
ECThe Little Rock radar (KLZK), 165 km away, was scanning. The volume nearest the first event began at 12:15 UTC.
3 flash flood. Local standard time, as filed.
Street flooding occurred in Dermott. Over a foot of water occurred on some streets.
Minor street flooding occurred in Lake Village.
Minor street flooding occurred in Portland.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arkansas in 2017Every state in 2017This day in weather historyWarnings in Arkansas, August 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: 713305, 713307, 713306.