Alert archive / Iowa / Flash Flood Watches in 2019
Flash Flood Watch 3, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood watch at May 18, 2019, 3:59 AM CDT for 30 counties in Iowa. It took effect at May 18, 2019, 4:00 PM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- May 18, 2019, 3:59 AM CDT (08:59 UTC)
- In effect from
- May 18, 2019, 4:00 PM CDT
- Expired
- May 19, 2019, 1:00 AM CDT
- In force
- 9 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
All 30 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Grundy County, IA, Guthrie County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 41 km from the middle of the area, began a volume at 09:02 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Topeka, KS (KFOE), launched 00:00Z, 9.0 hours before the alert went out and 321 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 186 J/kg
- Mixed-layer CIN
- -217 J/kg
- Mixed-layer LCL
- 1950 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 120 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
What forecasters said that day
The local office's own words before this flash flood watch went out, 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 this flash flood watch went out at May 18, 3:44 AM CDT, 15 minutes earlier.
Area forecast discussion, May 18, 3:44 AM CDT, 15 minutes before
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Hazardous Weather Outlook National Weather Service Des Moines IA 342 PM CDT Fri May 17 2019 IAZ004-182045- Emmet- 342 PM CDT Fri May 17 2019 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight A River Flood Warning is in effect for the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Showers and thunderstorms are possible this evening and overnight. A few may become strong to severe with hail and strong winds the primary threats. .DAYS TWO THROUGH SEVEN...Saturday through Thursday More widespread shower and thunderstorm activity is expected to develop Saturday and continue into Saturday night. The potential exists for severe thunderstorms capable of producing large hail and damaging wind gusts. The most favorable period for severe weather occurs during the afternoon and evening hours. In addition, heavy rainfall will be possible which could cause localized flooding concerns. Another round of thunderstorm activity is forecast for Tuesday into Tuesday night. Severe weather and heavy rainfall will be possible, but details remain uncertain at this time. .SPOTTER INFORMATION STATEMENT... Spotters may be needed Saturday afternoon and evening. IAZ005>007-015>017-023>028-033>039-044>050-057>062-182045- Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-Pocahontas- Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-Webster- Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone- Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek- 342 PM CDT Fri May 17 2019 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Showers and thunderstorms are possible this evening and overnight. A few may become strong to severe with hail and strong winds the primary threats. .DAYS TWO THROUGH SEVEN...Saturday through Thursday More widespread shower and thunderstorm activity is expected to develop Saturday and continue into Saturday night. The potential exists for severe thunderstorms capable of producing large hail and damaging wind gusts. The most favorable period for severe weather occurs during the afternoon and evening hours. In addition, heavy rainfall will be possible which could cause localized flooding concerns. Another round of thunderstorm activity is forecast for Tuesday into Tuesday night. Severe weather and heavy rainfall will be possible, but details remain uncertain at this time. .SPOTTER INFORMATION STATEMENT... Spotters may be needed Saturday afternoon and evening. IAZ070>075-081>086-092>097-182045- Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 342 PM CDT Fri May 17 2019 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday More widespread shower and thunderstorm activity is expected to develop Saturday and continue into Saturday night. The potential exists for severe thunderstorms capable of producing large hail and damaging wind gusts. The most favorable period for severe weather occurs during the afternoon and evening hours. In addition, heavy rainfall will be possible which could cause localized flooding concerns. Another round of thunderstorm activity is forecast for Tuesday into Tuesday night. Severe weather and heavy rainfall will be possible, but details remain uncertain at this time. .SPOTTER INFORMATION STATEMENT... Spotters may be needed Saturday afternoon and evening.
In the hours before
Special weather statement, May 17, 11:48 PM CDT, 4 hours 11 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 7:13 PM CDT | Special Weather Statement | DMX | Cerro Gordo | 47 min |
| May 18, 10:11 AM CDT | River Flood Watch | DMX | Polk | 7 days |
| May 18, 10:11 AM CDT | River Flood Watch | DMX | Davis, Wapello | 11 hr |
| May 18, 10:11 AM CDT | River Flood Watch | DMX | Polk | 7 days |
| May 18, 10:11 AM CDT | River Flood Watch | DMX | Dallas, Greene | 5 days |
| May 18, 3:56 PM CDT | Special Weather Statement | DMX | Appanoose | 19 min |
| May 18, 4:18 PM CDT | Special Weather Statement | DMX | Appanoose, Davis, Lucas, Monroe, Wapello, Wayne | 42 min |
| May 18, 5:38 PM CDT | Special Weather Statement | DMX | Davis, Wapello | 52 min |
| May 18, 6:28 PM CDT | Special Weather Statement | DMX | Poweshiek | 62 min |
Nearby
Flash Flood Watches in Iowa, 2019Every flash flood watch in 2019
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.