A slow-moving occluded surface low continued to trek into and across Iowa, provided another opportunity for some periods of moderate to heavy rainfall and funnel clouds. Unlike the day prior, overall conditions were not quite as conducive for heavy rainfall and numerous funnel clouds, but were still an option.
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 DMX wrote it up.
A slow-moving occluded surface low continued to trek into and across Iowa, provided another opportunity for some periods of moderate to heavy rainfall and funnel clouds. Unlike the day prior, overall conditions were not quite as conducive for heavy rainfall and numerous funnel clouds, but were still an option. Overall instability was less with MUCAPE values only around 1000 J/kg, but with boundaries in the area and lifted condensation levels around 750 m, the possibility of a few funnel clouds was present. Overall, the day was quiet by recent days standards, with mostly showers to weak thunderstorms present. One funnel cloud report was made, and at least one instance of total heavy rainfall of 2 inches or more.
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 Des Moines, IA wrote its last area forecast discussion before the first event at Jun 25, 9:09 PM CST, 51 minutes earlier.
Area Forecast Discussion National Weather Service Des Moines IA 1009 PM CDT Mon Jun 25 2018 .UPDATE... Issued at 1010 PM CDT Mon Jun 25 2018 Have sent out a quick update with the latest radar trends for pops and extended the flash flood watch through 12z. NAM showing potential for heavy rain still across the north through late tonight with a few rounds of showers and storms still anticipated as an upper trough rotates northeastward toward Iowa. Therefore with the heavy rains and saturated conditions already in place across portions of northern Iowa have opted to extend the Flash Flood Watch through 12z Tuesday. && .DISCUSSION.../Tonight through Monday/ Issued at 326 PM CDT Mon Jun 25 2018 Upper trough continues to spin off to the west across central NE/KS with the surface reflection across SE NE. A warm frontal boundary extends across far northern MO southeastward into central MO with a quasi-dry line/sfc trough axis stretching SSE across far NW MO. These two features have a few developing weak storms associated with them at the moment and are expected to rotate ENE into south central Iowa through the evening hours as the upper level system slowly nudges ENE into east central NE by 06z tonight. Some clearing behind an initial push of showers and some weak thunderstorms across the far southwest into MO. MUCAPE values around 1000 J/KG with strong deep layer shear. As the boundaries rotate northward, there will be a small window of chances for severe storms through early/mid evening across far central into south central Iowa. Given the lower values of instability present, expect the hail threat to be lower. With soundings showing tall, skinny CAPE and decent shear, strong storm rotation expected. Low LCLs and increased sfc vorticity near the boundaries should yield a main threat of tornadoes for any strong to severe storm. A downburst can't be ruled out. Other threat will be for heavy rainfall as the upper low continues to lift ENE and rounds of storms move through west central and north central Iowa. Storm motions should still be more progressive, but with a few areas of storms to move through and potential lingering of storms across the far north the threat of heavy rainfall still possible. Much of it will depend on the intensity of the activity by mid/late evening as it pushes into northern Iowa. Narrow corridor of higher PWATS as well so could see some higher rain rates at times. Into Tuesday the upper trough to move across Iowa through the day with continues chances for showers and some storms. Threat into the afternoon across the far east/southeast of some stronger CAPE and storms to develop along the frontal boundary moving across southeast Iowa. There will be a small window in the far southeast for a severe storm through the afternoon hours, with the activity expected to quickly move east southeast of the area. Precipitation to quickly move east of the area Tuesday evening with skies to clear as well with the upper trough moving north and east of the state. Wednesday will have a brief area of high pressure build into the state with another frontal boundary dropping south into the state toward late Wednesday into Thursday. The boundary to stall across Iowa Thursday with an upper level shortwave to top a broad upper level ridge building into the central US. This could bring additional chances for storms and potentially a strong storm across northern Iowa Thursday afternoon. Drier conditions then build in for Friday with thermal profiles warming and temperatures heating back up. An upper level trough to dig into the northern Rockies/northern Plains by the weekend with a frontal boundary dropping through the state by late Saturday into Sunday. This will bring the next chance for widespread precipitation beyond tonight/Tuesday. && .AVIATION.../For the 00Z TAFS through 00Z Tuesday evening/ Issued at 624 PM CDT Mon Jun 25 2018 Showers moving through north with thunderstorms to transition through the area this evening into the early morning hours. Areas of showers and some thunderstorms possible across much of the area through Tuesday. Tried to highlight the best times, but trends will change as the upper level system continues to track northeast through Iowa Tuesday. Winds to shift around to the west to the southwest into west toward Tuesday. && .HYDROLOGY... Issued at 326 PM CDT Mon Jun 25 2018 Little changes expected with the threat for heavy rainfall with a few rounds of storms expected to move through west central into north central Iowa tonight. Still possible to have more progressive storm motions, but with the heavy rainfall from the past day to few days it won't take much to exacerbate the already wet conditions. && .DMX WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch until 7 AM CDT Tuesday for IAZ004>007-015>017- 023>025-033>035-044>046. && UPDATE...Beerends DISCUSSION...Beerends AVIATION...Beerends HYDROLOGY...Beerends
Hazardous Weather Outlook National Weather Service Des Moines IA 302 PM CDT Mon Jun 25 2018 IAZ026>028-036>039-047>050-057>062-070>074-081>084-092>094-262015- Franklin-Butler-Bremer-Hamilton-Hardin-Grundy-Black Hawk-Boone- Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek- Cass-Adair-Madison-Warren-Marion-Adams-Union-Clarke-Lucas-Taylor- Ringgold-Decatur- 302 PM CDT Mon Jun 25 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight River Flood Warnings remain in effect for portions of the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Thunderstorms are forecast this afternoon and evening. Isolated severe storms are possible, especially in central and southwest Iowa. All modes of severe weather are possible including large hail, damaging winds and isolated tornadoes. Locally heavy rain is possible across the entire area tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Flood Warnings are expected to continue for portions of the area through early next week. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Scattered severe thunderstorms are possible over southeast Iowa on Tuesday afternoon and evening. Large hail and damaging winds appear to be the primary threats. Additional thunderstorms will be possible Thursday morning. It is too early to determine the potential for severe weather during that time. Hot and humid weather will return to the region Thursday through Saturday with heat indices approaching 95 to 105 F. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening across central Iowa. Spotter activation may be needed Tuesday over portions of southeast Iowa. IAZ004>007-015>017-023>025-033>035-044>046-262015- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Crawford-Carroll- Greene- 302 PM CDT Mon Jun 25 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight A Flash Flood Watch is in effect for the area through late this evening. Flood Warnings remain in effect for portions of the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Thunderstorms are forecast this afternoon and evening. Isolated severe storms are possible, especially in central and southwest Iowa. All modes of severe weather are possible including large hail, damaging winds and isolated tornadoes. Locally heavy rain is possible across the entire area tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Flood Warnings are expected to continue for portions of the area through into early next week. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Non-severe thunderstorms are possible on Tuesday afternoon and evening. Additional thunderstorms will be possible Thursday morning. It is too early to determine the potential for severe weather during that time. Hot and humid weather will return to the region Thursday through Saturday with heat indices approaching 95 to 105 F. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening across central Iowa. IAZ075-085-086-095>097-262015- Mahaska-Monroe-Wapello-Wayne-Appanoose-Davis- 302 PM CDT Mon Jun 25 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Thunderstorms are forecast this afternoon and evening. Isolated severe storms are possible. Large hail, damaging winds, and isolated tornadoes are the primary threats. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Scattered severe thunderstorms are possible on Tuesday afternoon and evening. Large hail and damaging winds appear to be the primary threats. Additional thunderstorms will be possible Thursday morning. It is too early to determine the potential for severe weather during that time. Hot and humid weather will return to the region Thursday through Saturday with heat indices approaching 95 to 105 F. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. Spotter activation may be needed Tuesday.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
936 PM CDT MON JUN 25 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0935 PM HEAVY RAIN 2 E DES MOINES INT AIRP 41.53N 93.61W
06/25/2018 M3.08 INCH POLK IA PUBLIC
VIA SOCIAL MEDIA.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
943 PM CDT MON JUN 25 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0941 PM HEAVY RAIN 2 S NORWALK 41.47N 93.68W
06/25/2018 M2.10 INCH WARREN IA TRAINED SPOTTER
CREEK IN WINDFLOWER PARK MOVING SWIFTLY AND
OUT OF BANKS, DOES NOT HAPPEN OFTEN.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
951 PM CDT MON JUN 25 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0950 PM HEAVY RAIN 2 SSE ALTOONA 41.63N 93.47W
06/25/2018 M2.09 INCH POLK IA COCORAHS
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1004 PM CDT MON JUN 25 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1003 PM HEAVY RAIN MITCHELLVILLE 41.66N 93.36W
06/25/2018 M3.14 INCH POLK IA PUBLIC
DITCHES FULL.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1016 PM CDT MON JUN 25 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1015 PM HEAVY RAIN 1 N PLEASANT HILL 41.60N 93.51W
06/25/2018 E4.00 INCH POLK IA PUBLIC
VIA SOCIAL MEDIA.
&&
FOWLEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1057 PM CDT MON JUN 25 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1057 PM HEAVY RAIN CARLISLE 41.50N 93.49W
06/25/2018 E4.00 INCH WARREN IA PUBLIC
VIA BROADCAST MEDIA.
&&The Des Moines radar (KDMX), 116 km away, was scanning. The volume nearest the first event began at 04:00 UTC.
1 heavy rain, 1 funnel cloud, 1 flash flood. Local standard time, as filed.
Public reported heavy rainfall of 2.10 inches from late on the 25th though the morning and early afternoon of the 26th.
Chaser reported a funnel cloud 2 miles west of the intersection of Highway 30 and Highway 330 along Highway 30.
Water was reported out of the bank of a local creek and running through farm fields south of Mitchellville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2018Every state in 2018This day in weather historyWarnings in Iowa, June 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: 764648, 764647, 766992.