An upper level low pressure system brought heavy rain and some flash flooding to the region on the 22nd of April. Gradient winds also produced some downed trees in the afternoon of the 22nd and once again early in the morning on the 26th.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 upper level low pressure system brought heavy rain and some flash flooding to the region on the 22nd of April. Gradient winds also produced some downed trees in the afternoon of the 22nd and once again early in the morning on the 26th.
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 Apr 22, 4:33 AM CST, 4 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service Jackson MS 533 AM CDT Sun Apr 22 2018 .UPDATE... Updated for 12Z aviation discussion && .AVIATION... 12Z TAF discussion: MVFR ceilings have moved into the area along with showers. Some IFR ceilings have also moved in. These lowered ceilings will continue through the morning into the afternoon as a swath of rain moves east and should affect all TAF sites. Additional showers and some thunderstorms will be possible this afternoon ahead of the cold front that will move through. Some storms could be severe with gusty winds. The bulk of the rain should move out of the area by 00Z. A brief return to VFR ceilings may be possible this afternoon or early evening before a return to MVFR/IFR ceilings tonight. Some lowered vis will also be possible, especially in the heavier rain bands through the day. Today is not looking like a good day to fly. /28/ && .DISCUSSION... Today and tonight: The main concern in the short term is the rain and storms today and potential for severe storms. A swath of showers and embedded thunderstorms are slowly making their way east overnight. This comes as a large cutoff low spins across the Southern Plains. Through today, this low will slowly move east. As this occurs, a surface low will develop across portions of southeast Arkansas. Ahead of this low, moisture will continue to move into the region. Showers and storms will develop and move across the area through the day. The greatest potential for any severe storms should be generally along and east of the Mississippi River, but especially across portions of east central Mississippi. This will be the case as some destabilization could occur later this morning into the afternoon hours especially along the actual cold front. Hi-res model guidance shows less in the way of storms across northern portions of the forecast area due to potentially being more stable from earlier convection, but if there can be enough of a lull and/or breaks to allow for some heating, there could be a severe storm along the front. Thus, will leave this area in the marginal risk. The primary risks with these storms today will be from damaging winds, but a tornado cannot be completely ruled out, particularly across east central Mississippi. Hail seems less likely of all the weather hazards as lapse rates are not overly impressive. Will also keep the mention of heavy rain and localized flooding, though this seems like a lesser risk as well. The rain and storms should mostly be out of the forecast area by this evening, though some wraparound moisture may bring a few light showers to the northeast/Golden Triangle this evening. The upper low will be very slow to move out of the region, with it lingering across the Mid-South as we head into Monday morning. /28/ Tomorrow (Monday) through next Saturday: In the wake of the cold front moving through, expect west- northwesterly cold air advection to keep lingering moisture and widespread clouds locked in by the start of the work week. With the center of the cold core upper low moving right over the mid-South, expect these conditions to remain locked in throughout the day. These widespread light rain and drizzle chances will keep most of the area much cooler to start the work week, some areas around 10 degrees below average (mid-upper 60s in the north to low 70s in the south). Expect the coolest temperatures Monday along and north of the I-20 corridor & some areas could reach the top 5 coolest high temperatures for Monday. If coverage and intensity of light rain is more than anticipated, this setup could easily struggle to reach these anticipated highs. In addition, lows will be slightly warmer due lingering clouds. Expect ridging to slowly build along the Atlantic seaboard Tuesday, keeping the cold core upper low slow to depart the area. This will keep boundary layer moisture and light rain and drizzle chances lingering into the Golden Triangle by Tuesday, with highs slightly below normal. As the upper low builds to the east, finally you can expect a brief drying period as weak shortwave ridging builds in. However, this will be only temporary and maybe not even last into mid-week (Wednesday) as another trough & clipper dives down through the Great Lakes. Model consensus continues to struggle with the phasing of this trough and one also diving through the Plains. The GFS is the most phased and faster to move rain chances in Wednesday while the Euro/Canadian are less phased and more focused on Thursday. Decided to lower PoPs Wednesday but kept lower end light rain chances through Thursday. Timing consensus will be ironed out in the coming days. As the trough and rain chances depart, expect another brief dry period around Friday morning. However, another clipper system (trough) will be diving down again through the Great Lakes. This will help another weak cold front and light rain chances to move back in around late week-early weekend. Consensus of global models continues to struggle as models seem to have somewhat different picture on trough amplification. Regardless, expect another round of light rain chances and maybe some thunder in the west on Friday- Saturday, with most rain chances moving out by next weekend. Thankfully, none of these fronts and systems look really concerning. After that, expect strong surface ridging and drier air to build in, helping cooler than normal temperatures to move back in by next weekend. /DC/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 75 54 68 53 / 99 18 18 14 Meridian 75 54 70 53 / 100 40 16 14 Vicksburg 75 54 69 54 / 81 6 14 14 Hattiesburg 76 55 73 54 / 100 18 6 9 Natchez 76 53 71 53 / 86 5 8 8 Greenville 73 55 67 53 / 75 23 38 16 Greenwood 72 55 66 53 / 88 26 42 23 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. && 28
Hazardous Weather Outlook National Weather Service Jackson MS 429 AM CDT Sun Apr 22 2018 ARZ074-075-LAZ007>009-015-016-023>026-MSZ034-040-230930- Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland- Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Washington- Issaquena- 429 AM CDT Sun Apr 22 2018 This hazardous weather outlook is for portions of southeast Arkansas, northeast Louisiana, northwest Mississippi, and west central Mississippi. .DAY ONE...Today and Tonight FLOODING THREAT...Limited TIMING...Today Localized rainfall amounts of up to 1 to 3 inches are possible through early afternoon. This could result in localized flash flooding. (https://www.weather.gov/images/jan/graphicast/image1.png) .DAYS TWO THROUGH SEVEN...Monday through Saturday 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 Saturday. MSZ018-019-025>033-035>039-041>066-072>074-230930- Bolivar-Sunflower-Leflore-Grenada-Carroll-Montgomery-Webster-Clay- Lowndes-Choctaw-Oktibbeha-Humphreys-Holmes-Attala-Winston-Noxubee- 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- 429 AM CDT Sun Apr 22 2018 This hazardous weather outlook is for portions of central Mississippi, north central Mississippi, and south central Mississippi. .DAY ONE...Today and Tonight SEVERE THUNDERSTORMS THREAT...Marginal TIMING...Today FLOODING THREAT...Limited TIMING...Today Isolated severe storms capable of producing damaging wind gusts, and a tornado or two are possible mid morning through early evening. (https://www.weather.gov/images/jan/graphicast/image2.png) Localized rainfall amounts of up to 1 to 3 inches are possible through early afternoon. This could result in localized flash flooding. (https://www.weather.gov/images/jan/graphicast/image1.png) .DAYS TWO THROUGH SEVEN...Monday through Saturday 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 may be needed for portions of the region today. 28 && ...HAZARD LEGEND... *FLOODING* Extreme...Confident in significant flooding. Significant...Significant flooding possible. Elevated...Confident in flooding. Limited...Flooding possible. *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... https://www.weather.gov/jan Stay Aware, Stay Safe NWS JAN Briefing Page... https://www.weather.gov/jan/safe Latest Weather Briefing... https://www.weather.gov/jan/weather_briefing Find NWS JAN on Facebook... https://www.facebook.com/NWSJacksonMS Follow NWS JAN on Twitter... @NWSJacksonMS Follow NWS JAN on Youtube... https://www.youtube.com/user/NWSJacksonMiss ...ADDITIONAL URLS FOR FLOODING ISSUES... Current Watches and Warnings... https://www.weather.gov/jan/safe_HeavyRain Observed Precipitation Images... https://www.weather.gov/jan/precipmaps River Forecast Center... https://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 ...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
935 AM CDT SUN APR 22 2018
MSZ063-064-221515-
Lawrence MS-Jefferson Davis MS-
935 AM CDT SUN APR 22 2018
...A GUSTY SHOWER WILL AFFECT EASTERN LAWRENCE AND NORTHERN
JEFFERSON DAVIS COUNTIES THROUGH 1015 AM CDT...
At 934 AM CDT, Meteorologists were tracking a shower producing gusty
wind near Progress, or 21 miles south of Pinola, moving northeast at
30 mph.
Winds in excess of 40 mph will be possible with this shower.
Locations impacted include...
Prentiss, Clem, Progress, Arm and Silver Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.
&&
LAT...LON 3147 9005 3157 9011 3177 8992 3177 8981
3173 8976 3162 8976
TIME...MOT...LOC 1434Z 228DEG 27KT 3157 9000
DLSpecial Weather Statement
National Weather Service Jackson MS
1004 AM CDT SUN APR 22 2018
MSZ062-221545-
Lincoln MS-
1004 AM CDT SUN APR 22 2018
...A GUSTY SHOWER WILL AFFECT SOUTHERN LINCOLN COUNTY THROUGH 1045
AM CDT...
At 1004 AM CDT, Meteorologists were tracking a strong thunderstorm
near Center Point, or 10 miles northwest of Mccomb, moving northeast
at 25 mph.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Brookhaven, Enterprise, Center Point, Ruth and Bogue Chitto.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.
&&
LAT...LON 3140 9063 3162 9048 3141 9024 3139 9024
3135 9034 3135 9063
TIME...MOT...LOC 1504Z 231DEG 21KT 3136 9057
DLThe Jackson/Brandon,MS radar (KDGX), 19 km away, was scanning. The volume nearest the first event began at 15:32 UTC.
2 flash flood, 2 strong wind. Local standard time, as filed.
Water covered the road along Executive Place.
Water covered the road along White Blvd.
A tree was blown down on the intersection of Country Road 376 and Highway 11 near Enterprise.
Two trees were blown down, partially impacting a nearby church. Adjacent power lines were downed as well along with blockage of one lane of traffic.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Mississippi in 2018Every state in 2018This day in weather historyWarnings in Mississippi, April 2018
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: 748346, 748347, 748350, 748353.