Alert archive / Iowa / Flash Flood Warnings in 2017
Flash Flood Warning 5, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 21, 2017, 10:24 PM CDT for Bremer County, Iowa. It was in force for 15 hr. 4 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
- Jul 21, 2017, 10:24 PM CDT (03:24 UTC)
- Expired
- Jul 22, 2017, 1:45 PM CDT
- In force
- 15 hr
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Flood severity
- None
County Bremer County, IA
The radar
The La Crosse radar (KARX), 140 km from the middle of the area, began a volume at 03:24 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 |
|---|---|---|---|
| Jul 22, 1:35 AM CDT | FLASH FLOOD | 1 W Sumner, IA | REPORTS OF SEVERAL HOUSES WITH WATER FLOODING INTO BASEMENTS. NUMEROUS ROADS COVERED WITH WATER UP TO ONE FOOT IN PLACES. AT LEAST ONE PERSON BEING EVACUATED FROM HOME. |
| Jul 22, 4:00 AM CDT | FLASH FLOOD | 1 Nw Sumner, IA | UP TO A DOZEN EVACUATIONS FROM HIGH WATER AROUND THE SUMNER AREA. MULTIPLE ROAD CLOSURES AS WELL. |
| Jul 22, 5:41 AM CDT | FLASH FLOOD | 2 W Sumner, IA | IDOT REPORTS IA 93 BETWEEN COUNTY ROAD V48 (NEAR TRIPOLI) AND COUNTY ROAD V68 (NEAR SUMNER) IS BLOCKED DUE TO FLOODING. |
| Jul 22, 5:42 AM CDT | FLASH FLOOD | Sumner, IA | TOTAL EVACUATIONS IN SUMNER NOW 15-18 PEOPLE. NUMEROUS ROADS CONTINUE TO BE UNDERWATER. ELECTRICAL POWER IN SUMNER HAS BEEN INTERRUPTED AS WELL. |
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, 3.4 hours before the alert went out and 251 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
- 337 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 981 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
356 WGUS53 KDMX 220324 FFWDMX IAC017-220930- /O.NEW.KDMX.FF.W.0005.170722T0324Z-170722T0930Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Des Moines IA 1024 PM CDT FRI JUL 21 2017 The National Weather Service in Des Moines has issued a * Flash Flood Warning for... Northeastern Bremer County in northeastern Iowa... * Until 430 AM CDT Saturday. * At 1024 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Sumner, Tripoli and Frederika. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. 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 4277 9228 4291 9246 4291 9208 4272 9208 $$ Lee
6 follow-up statements
931 WGUS73 KDMX 220649 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 149 AM CDT SAT JUL 22 2017 IAC017-220930- /O.CON.KDMX.FF.W.0005.000000T0000Z-170722T0930Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Bremer IA- 149 AM CDT SAT JUL 22 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM CDT FOR NORTHEASTERN BREMER COUNTY... At 143 AM CDT, Doppler radar indicated thunderstorms producing very heavy rain across the warned area. Radar estimated rainfall of up to three to four inches of rain have already fallen since 10 PM Friday night and additional very heavy rain is expected to persist through the morning hours. At 140 AM CDT, local law enforcement reported several roads in the warned area being inundated with flowing water and the hardest hit area has been in and around Sumner in far northeast Bremer County. However other locations likely to experience flash flooding include...Tripoli and Frederika. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. Flash Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks. && LAT...LON 4277 9228 4291 9246 4291 9208 4272 9208 $$ Podrazik
850 WGUS53 KDMX 220916 FFWDMX IAC017-221300- /O.EXT.KDMX.FF.W.0005.000000T0000Z-170722T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Des Moines IA 416 AM CDT SAT JUL 22 2017 The National Weather Service in Des Moines has extended the * Flash Flood Warning for... Northeastern Bremer County in northeastern Iowa... * Until 800 AM CDT. * At 400 AM CDT, emergency management reported multiple evacuations in the Sumner area along with several road closures due to high water throughout the county. Radar estimated up to three to four inches of rain have already fallen in addition to what accumulated early Friday morning. Flash flooding is already occurring and is expected to persist through the morning hours. * Locations that will experience flooding include...Sumner, Tripoli and Frederika. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. 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 4277 9228 4291 9246 4291 9208 4272 9208 $$ Podrazik
424 WGUS73 KDMX 221101 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 601 AM CDT SAT JUL 22 2017 IAC017-221300- /O.CON.KDMX.FF.W.0005.000000T0000Z-170722T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Bremer IA- 601 AM CDT SAT JUL 22 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 AM CDT FOR NORTHEASTERN BREMER COUNTY... At 558 AM CDT, emergency management reported flash flooding in Sumner as well as throughout much of northeast Bremer County. At 542 AM CDT, emergency management reported multiple evacuations have occurred in Sumner as well as power being interrupted in town. Several roads in northeast Bremer County remain underwater. Additional locations that will experience flooding include... Tripoli and Frederika. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 4277 9228 4291 9246 4291 9208 4272 9208 $$ Podrazik
316 WGUS53 KDMX 221250 FFWDMX IAC017-221600- /O.EXT.KDMX.FF.W.0005.000000T0000Z-170722T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Des Moines IA 750 AM CDT SAT JUL 22 2017 The National Weather Service in Des Moines has extended the * Flash Flood Warning for... Northeastern Bremer County in northeastern Iowa... * Until 1100 AM CDT. * At 748 AM CDT, emergency management reported flash flooding continues across much of northeast Bremer County. Many small creeks continue to rise in and around Sumner. * Locations experiencing flooding include...Sumner, Tripoli and Frederika. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other drainage areas and low lying spots. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 4277 9228 4291 9246 4291 9208 4272 9208 $$ Podrazik
681 WGUS53 KDMX 221555 FFWDMX IAC017-221900- /O.EXT.KDMX.FF.W.0005.000000T0000Z-170722T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Des Moines IA 1055 AM CDT SAT JUL 22 2017 The National Weather Service in Des Moines has extended the * Flash Flood Warning for... Northeastern Bremer County in northeastern Iowa... * Until 200 PM CDT. * At 1054 AM CDT, local law enforcement reported flash flooding continues across much of northeast Bremer County. Many small creeks continue to rise in and around Sumner. * Some locations that will experience flooding include... Sumner, Tripoli and Frederika. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other drainage areas and low lying spots. && LAT...LON 4277 9228 4291 9246 4291 9208 4272 9208 $$ Kotenberg
096 WGUS73 KDMX 221845 FFSDMX Flash Flood Statement National Weather Service Des Moines IA 145 PM CDT SAT JUL 22 2017 IAC017-221853- /O.CAN.KDMX.FF.W.0005.000000T0000Z-170722T1900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Bremer IA- 145 PM CDT SAT JUL 22 2017 ...THE FLASH FLOOD WARNING FOR NORTHEASTERN BREMER COUNTY IS CANCELLED... The heavy rain has ended. However, local Emergency Management reports that several major roadways in northeastern Bremer County, including Highway 93 into Sumner, is still closed due to flooding. Please continue to heed any remaining road closures. LAT...LON 4277 9228 4291 9246 4291 9208 4272 9208 $$ Kotenberg
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 9:58 PM CDT | Special Weather Statement | DMX | Bremer | 62 min |
| Jul 22, 2:04 AM CDT | Flash Flood Warning | DMX | Black Hawk, Bremer, Butler | 6 hr |
| Jul 22, 3:59 AM CDT | Heat Advisory | DMX | Audubon, Cass, Guthrie | 16 hr |
| Jul 22, 7:56 AM CDT | Areal Flood Warning | DMX | Bremer | 24 hr |
| Jul 22, 2:19 PM CDT | Areal Flood Warning | DMX | Bremer | 24 hr |
Nearby
Flash Flood Warnings in Iowa, 2017Every flash flood warning in 2017
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.