Alert archive / Iowa / Flash Flood Warnings in 2019
Flash Flood Warning 21, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Aug 20, 2019, 5:06 AM CDT for 4 counties in Iowa. It was in force for 5 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 20, 2019, 5:06 AM CDT (10:06 UTC)
- Expired
- Aug 20, 2019, 10:27 AM CDT
- In force
- 5 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hamilton County, IA, Humboldt County, IA, Webster County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 10:06 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 20, 6:35 AM CDT | HEAVY RAIN 4.5 | Eagle Grove, IA | VIA SOCIAL MEDIA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 10.1 hours before the alert went out and 243 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1590 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
753 WGUS53 KDMX 201006 FFWDMX IAC079-091-187-197-201600- /O.NEW.KDMX.FF.W.0021.190820T1006Z-190820T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Des Moines IA 506 AM CDT Tue Aug 20 2019 The National Weather Service in Des Moines has issued a * Flash Flood Warning for... Northeastern Webster County in central Iowa... Southern Wright County in north central Iowa... Eastern Humboldt County in north central Iowa... North central Hamilton County in central Iowa... * Until 1100 AM CDT. * At 504 AM CDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Up to three inches of rain have already fallen based on home weather stations and radar estimates across the area. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Webster City, Clarion, Dakota City, Humboldt, Eagle Grove, Big Wall Lake, Goldfield, Dows, Renwick, Blairsburg, Thor, Woolstock, Hardy, Galt, Clarion Municipal Airport, Eagle Grove Municipal Airport and Sportsman Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 4266 9350 4243 9369 4270 9422 4289 9405 $$ Hagenhoff
2 follow-up statements
726 WGUS73 KDMX 201306 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 806 AM CDT Tue Aug 20 2019 IAC079-091-187-197-201600- /O.CON.KDMX.FF.W.0021.000000T0000Z-190820T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Webster IA-Wright IA-Humboldt IA-Hamilton IA- 806 AM CDT Tue Aug 20 2019 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT FOR NORTHEASTERN WEBSTER...SOUTHERN WRIGHT...EASTERN HUMBOLDT AND NORTH CENTRAL HAMILTON COUNTIES... At 802 AM CDT, Doppler radar indicated additional showers and thunderstorms with locally heavy rain entering the warned area. As much as 4 to 5 inches of rain has already fallen, with a total of 4.5 inches thus far reported in Eagle Grove. Flash flooding is likely occurring in some areas, or is expected to begin. Some locations that will experience flooding include... Webster City, Clarion, Dakota City, Humboldt, Eagle Grove, Big Wall Lake, Goldfield, Dows, Renwick, Blairsburg, Thor, Woolstock, Hardy, Galt, Clarion Municipal Airport, Eagle Grove Municipal Airport and Sportsman Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 4266 9350 4243 9369 4270 9422 4289 9405 $$ Zogg
801 WGUS73 KDMX 201527 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 1027 AM CDT Tue Aug 20 2019 IAC079-091-187-197-201535- /O.CAN.KDMX.FF.W.0021.000000T0000Z-190820T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Webster IA-Wright IA-Humboldt IA-Hamilton IA- 1027 AM CDT Tue Aug 20 2019 ...THE FLASH FLOOD WARNING FOR NORTHEASTERN WEBSTER...SOUTHERN WRIGHT...EASTERN HUMBOLDT AND NORTH CENTRAL HAMILTON COUNTIES IS CANCELLED... The heavy rain has ended. No reports of flash flooding have been received. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 4266 9350 4243 9369 4270 9422 4289 9405 $$ Zogg
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 2:35 AM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Wright | 40 min |
| Aug 20, 2:38 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Sac | 52 min |
| Aug 20, 2:49 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford | 41 min |
| Aug 20, 3:10 AM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth, Palo Alto | 35 min |
| Aug 20, 3:44 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 46 min |
| Aug 20, 3:48 AM CDT | Severe Thunderstorm Warning | DMX | Hancock, Humboldt, Kossuth, Wright | 42 min |
| Aug 20, 4:10 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Greene | 50 min |
| Aug 20, 4:20 AM CDT | Severe Thunderstorm Warning | DMX | Franklin, Hamilton, Hardin | 40 min |
| Aug 20, 4:33 AM CDT | Severe Thunderstorm Warning | DMX | Franklin, Hamilton, Hardin, Wright | 42 min |
| Aug 20, 4:35 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Boone, Dallas, Greene, Guthrie, Madison | 40 min |
| Aug 20, 5:02 AM CDT | Severe Thunderstorm Warning | DMX | Franklin, Grundy, Hamilton, Hardin | 43 min |
| Aug 20, 5:29 AM CDT | Tornado Warning | DMX | Madison, Warren | 31 min |
| Aug 20, 5:32 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Warren | 33 min |
| Aug 20, 5:38 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union, Warren | 28 min |
| Aug 20, 5:48 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk | 15 min |
| Aug 20, 5:55 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Jasper, Lucas, Mahaska, Marion, Monroe and 4 more | 65 min |
| Aug 20, 5:59 AM CDT | Tornado Warning | DMX | Lucas, Marion, Warren | 16 min |
| Aug 20, 6:34 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Lucas, Mahaska, Monroe, Wapello and 1 more | 56 min |
Nearby
Flash Flood Warnings in Iowa, 2019Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.