Alert archive / Iowa / Flash Flood Warnings in 2018
Flash Flood Warning 3, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jun 9, 2018, 4:00 PM CDT for Cerro Gordo County, Worth County, Iowa. It was in force for 6 hr. 3 reports 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
- Jun 9, 2018, 4:00 PM CDT (21:00 UTC)
- Expired
- Jun 9, 2018, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cerro Gordo County, IA, Worth County, IA
The radar
The Des Moines radar (KDMX), 161 km from the middle of the area, began a volume at 21:00 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 |
|---|---|---|---|
| Jun 9, 4:47 PM CDT | FLASH FLOOD | 1 Nnw Mason City, IA | SEVERAL ROADS IN TOWN REPORTEDLY UNDER 1 TO 2 FEET OF WATER. |
| Jun 9, 4:50 PM CDT | FLASH FLOOD | 5 S Mason City, IA | CULVERTS ARE OVERWHELMED. WATER IS ALREADY COVERING HALF OF THE OUTSIDE LINES ON HWY 65 AT THIS LOCATION. |
| Jun 9, 6:31 PM CDT | FLASH FLOOD | 5 S Mason City, IA | US 65 CLOSED DUE TO WATER OVER THE ROADWAY NEAR MILE MARKER 200. |
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 12:00Z, 9.0 hours before the alert went out and 194 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
- 395 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 661 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted.
712 WGUS53 KDMX 092100 FFWDMX IAC033-195-100300- /O.NEW.KDMX.FF.W.0003.180609T2100Z-180610T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Des Moines IA 400 PM CDT SAT JUN 9 2018 The National Weather Service in Des Moines has issued a * Flash Flood Warning for... Worth County in north central Iowa... Cerro Gordo County in north central Iowa... * Until 1000 PM CDT Saturday. * At 359 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Radar has estimated up to two inches of rain have already fallen. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Mason City, Nora Springs, Manly, Rockwell, Mason City Municipal Airport, Rice Lake, Clear Lake, Ventura, Thornton, Plymouth, Fertile, Kensett, Grafton, Hanlontown, Joice, Swaledale, Rock Falls, Burchinal, Portland and Bolan. This includes Interstate 35 between mile markers 181 and 212. PRECAUTIONARY/PREPAREDNESS ACTIONS... Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks. && LAT...LON 4294 9303 4295 9350 4340 9350 4341 9302 $$ Podrazik
3 follow-up statements
107 WGUS73 KDMX 092357 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 657 PM CDT SAT JUN 9 2018 IAC033-195-100300- /O.CON.KDMX.FF.W.0003.000000T0000Z-180610T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Worth IA-Cerro Gordo IA- 657 PM CDT SAT JUN 9 2018 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT FOR WORTH AND CERRO GORDO COUNTIES... At 656 PM CDT, Doppler radar indicated heavy rain across the warned area. Up to three inches of rain have already fallen. Flash flooding is already occurring. US 65 is closed near mile marker 200 due to water over the roadway. Some locations that will experience flooding include... Mason City, Nora Springs, Manly, Rockwell, Mason City Municipal Airport, Rice Lake, Clear Lake, Ventura, Thornton, Plymouth, Fertile, Kensett, Grafton, Hanlontown, Joice, Swaledale, Rock Falls, Burchinal, Portland and Bolan. This includes Interstate 35 between mile markers 181 and 212. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks. && LAT...LON 4294 9303 4295 9350 4340 9350 4341 9302 $$ Zogg
359 WGUS73 KDMX 100046 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 746 PM CDT SAT JUN 9 2018 IAC033-195-100300- /O.CON.KDMX.FF.W.0003.000000T0000Z-180610T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Worth IA-Cerro Gordo IA- 746 PM CDT SAT JUN 9 2018 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT FOR WORTH AND CERRO GORDO COUNTIES... Runoff from previous heavy rainfall of up to three inches will continue to produce flooding. Some locations that will experience flooding include... Mason City, Nora Springs, Manly, Rockwell, Mason City Municipal Airport, Rice Lake, Clear Lake, Ventura, Thornton, Plymouth, Fertile, Kensett, Grafton, Hanlontown, Joice, Swaledale, Rock Falls, Burchinal, Portland and Bolan. This includes Interstate 35 between mile markers 181 and 212. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks. && LAT...LON 4294 9303 4295 9350 4340 9350 4341 9302 $$ Hagenhoff
019 WGUS73 KDMX 100252 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 952 PM CDT SAT JUN 9 2018 IAC033-195-100301- /O.EXP.KDMX.FF.W.0003.000000T0000Z-180610T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Worth IA-Cerro Gordo IA- 952 PM CDT SAT JUN 9 2018 ...THE FLASH FLOOD WARNING FOR WORTH AND CERRO GORDO COUNTIES WILL EXPIRE AT 1000 PM CDT... The heavy rain has ended. Flash flooding is no longer expected to pose a threat. However, an Areal Flood Warning has been issued for continued water on area roads and highways. Please continue to heed any remaining road closures. LAT...LON 4294 9303 4295 9350 4340 9350 4341 9302 $$ Cogil
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 4:25 AM CDT | Special Weather Statement | DMX | Adams, Audubon, Carroll, Cass, Crawford, Taylor | 50 min |
| Jun 9, 5:57 AM CDT | Areal Flood Warning | DMX | Butler | 24 hr |
| Jun 9, 7:05 AM CDT | Special Weather Statement | DMX | Butler, Cerro Gordo, Franklin, Grundy, Hardin, Jasper and 3 more | 40 min |
| Jun 9, 11:25 AM CDT | Flash Flood Watch | DMX | Black Hawk, Bremer, Butler, Cerro Gordo, Worth | 12 hr |
| Jun 9, 11:46 AM CDT | Special Weather Statement | DMX | Worth | 59 min |
| Jun 9, 2:52 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 38 min |
| Jun 9, 2:57 PM CDT | Tornado Warning | DMX | Winnebago, Worth | 33 min |
| Jun 9, 3:20 PM CDT | Tornado Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 25 min |
| Jun 9, 3:37 PM CDT | Tornado Warning | DMX | Cerro Gordo, Hancock, Worth | 22 min |
| Jun 9, 3:57 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 48 min |
| Jun 9, 4:07 PM CDT | Tornado Warning | DMX | Cerro Gordo | 38 min |
| Jun 9, 5:39 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 66 min |
| Jun 9, 6:09 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 51 min |
| Jun 9, 6:58 PM CDT | Severe Thunderstorm Warning | DMX | Franklin | 32 min |
Nearby
Flash Flood Warnings in Iowa, 2018Every flash flood warning in 2018
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.