Alert archive / Iowa / Flash Flood Warnings in 2016
Flash Flood Warning 21, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Aug 11, 2016, 9:31 PM CDT for 4 counties in Iowa. It was in force for 6 hr. 17 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
- Aug 11, 2016, 9:31 PM CDT (02:31 UTC)
- Expired
- Aug 12, 2016, 3:30 AM CDT
- In force
- 6 hr
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Benton County, IA, Iowa County, IA, Johnson County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 121 km from the middle of the area, began a volume at 02:31 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 11, 9:35 PM CDT | HEAVY RAIN 3.5 | Middle Amana, IA | MODERATE TO HEAVY RAIN CONTINUES. LOTS OF STANDING WATER. NO FLASH FLOODING OBSERVED SO FAR. |
| Aug 11, 9:58 PM CDT | HEAVY RAIN 2.75 | 1 Sse Cedar Rapids, IA | 1.00 INCHES IN THE LAST HOUR. |
| Aug 11, 10:15 PM CDT | FLASH FLOOD | Marengo, IA | DELAYED REPORT. WATER 16 INCHES DEEP ON ROADS IN TOWN. WATER 18 INCHES DEEP BLOCKING ROAD 1 1/2 MILES NORTH OF TOWN. |
| Aug 11, 10:25 PM CDT | HEAVY RAIN 2.15 | W Belle Plaine, IA | |
| Aug 11, 10:54 PM CDT | HEAVY RAIN 4.7 | Middle Amana, IA | 1.2 INCHES SINCE THE LAST UPDATE. |
| Aug 11, 11:00 PM CDT | FLASH FLOOD | Nne Swisher, IA | LOCAL STREAMS SWOLLEN, GRAVEL WASHED OVER ROADS, STANDING WATER IN 2 RESIDENCE BASEMENTS.6.88 INCHES OF RAIN IN PAST12 HOURS |
| Aug 11, 11:00 PM CDT | FLASH FLOOD | Swisher, IA | LOCAL STREAMS SWOLLEN. GRAVEL WASHED ACROSS ROADS. WATER IN BASEMENTS OF 2 HOMES. |
| Aug 11, 11:04 PM CDT | FLASH FLOOD | Swisher, IA | THE CRANDIC RAILROAD EXPERIENCED WASHED OUT TRACKS AND A BRIDGE IN THE SWISHER AREA. |
| Aug 11, 11:12 PM CDT | HEAVY RAIN 2.6 | 2 Nnw North Liberty, IA | |
| Aug 11, 11:13 PM CDT | FLASH FLOOD | Hiawatha, IA | ROAD CLOSURE IN TOWN DUE TO WATER OVER THE ROAD. |
| Aug 11, 11:21 PM CDT | HEAVY RAIN 3.75 | 1 Sse Cedar Rapids, IA | UPDATED TOTAL |
| Aug 11, 11:30 PM CDT | HEAVY RAIN 3.5 | Atkins, IA | VIA TWITTER AND BROADCAST MEDIA |
| Aug 11, 11:35 PM CDT | HEAVY RAIN 2.8 | 1 Sw North Liberty, IA | |
| Aug 11, 11:43 PM CDT | HEAVY RAIN 1.58 | 5 Nw Iowa City, IA | RAINFALL IN THE LAST 40 MINUTES. |
| Aug 12, 1:00 AM CDT | HEAVY RAIN 2.62 | Iowa City Municipal Air, IA | DAILY RAINFALL TOTAL. 2.12 INCHES FELL BETWEEN 10PM AND 1AM. |
| Aug 12, 1:00 AM CDT | HEAVY RAIN 4.91 | Cedar Rapids Municipal, IA | DAILY RAINFALL TOTAL. 4.83 INCHES FELL IN THE 6 HRS FROM 7PM TO 1AM. |
| Aug 12, 1:07 AM CDT | HEAVY RAIN 0.98 | 2 Nnw North Liberty, IA | IN THE LAST 2 HOURS. STORM TOTAL OF 3.58 THUS FAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.5 hours before the alert went out and 127 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
- 1433 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 1263 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 5.6
The text
As transmitted.
156 WGUS53 KDVN 120231 FFWDVN IAC011-095-103-113-120830- /O.NEW.KDVN.FF.W.0021.160812T0231Z-160812T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA/IL 931 PM CDT THU AUG 11 2016 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * FLASH FLOOD WARNING FOR... JOHNSON COUNTY IN EAST CENTRAL IOWA... LINN COUNTY IN EAST CENTRAL IOWA... IOWA COUNTY IN EAST CENTRAL IOWA... BENTON COUNTY IN EAST CENTRAL IOWA... * UNTIL 330 AM CDT FRIDAY * AT 928 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. 2 TO 4 INCHES OF RAIN HAVE FALLEN SO FAR...AND ADDITIONAL HEAVY RAIN IS EXPECTED. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. * SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CEDAR RAPIDS...IOWA CITY...VINTON...MARENGO...WEST BRANCH...MARION... CORALVILLE...NORTH LIBERTY...HIAWATHA...MOUNT VERNON...ROBINS... WILLIAMSBURG...BELLE PLAINE...CENTER POINT...LISBON...FAIRFAX...SOLON... TIFFIN...ELY AND ATKINS. ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 INCHES ARE POSSIBLE IN THE WARNED AREA THROUGH THE EARLY MORNING HOURS. FLOODING OF STREETS AND ROADS IN URBAN AREAS IS THE MAIN CONCERN. THERE WERE REPORTS OF STALLED CALLS IN CEDAR RAPIDS EARLIER THIS EVENING. DO NOT DRIVE THROUGH WATER OF ANY DEPTH. THIS INCLUDES THE FOLLOWING HIGHWAYS... INTERSTATE 80 IN IOWA BETWEEN MILE MARKERS 205 AND 253. INTERSTATE 380 BETWEEN MILE MARKERS 1 AND 48. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. && LAT...LON 4230 9230 4229 9136 4162 9137 4163 9230 $$ RP KINNEY
3 follow-up statements
157 WGUS73 KDVN 120415 FFSDVN FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA/IL 1115 PM CDT THU AUG 11 2016 IAC011-095-103-113-120830- /O.CON.KDVN.FF.W.0021.000000T0000Z-160812T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JOHNSON IA-LINN IA-IOWA IA-BENTON IA- 1115 PM CDT THU AUG 11 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT FOR JOHNSON...LINN...IOWA AND BENTON COUNTIES... AT 1113 PM CDT...LOCAL LAW ENFORCEMENT REPORTED FLASH FLOODING...WITH A ROAD CLOSURE IN HIAWATHA AND LOCALIZED FLOODING AROUND CEDAR RAPIDS. 3 TO 5 INCHES OF RAIN HAVE FALLEN SO FAR OVER MUCH OF THE WARNED AREA. MORE FLASH FLOODING IS EXPECTED OVERNIGHT. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CEDAR RAPIDS...IOWA CITY...VINTON...MARENGO...WEST BRANCH...MARION... CORALVILLE...NORTH LIBERTY...HIAWATHA...MOUNT VERNON...ROBINS... WILLIAMSBURG...BELLE PLAINE...CENTER POINT...LISBON...FAIRFAX...SOLON... TIFFIN...ELY AND ATKINS. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE WARNED AREA THROUGH THE EARLY MORNING HOURS. PRECAUTIONARY/PREPAREDNESS ACTIONS... BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. && LAT...LON 4230 9230 4229 9136 4162 9137 4163 9230 $$ RP KINNEY
760 WGUS73 KDVN 120553 FFSDVN FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA/IL 1253 AM CDT FRI AUG 12 2016 IAC011-095-103-113-120830- /O.CON.KDVN.FF.W.0021.000000T0000Z-160812T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JOHNSON IA-LINN IA-IOWA IA-BENTON IA- 1253 AM CDT FRI AUG 12 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT FOR JOHNSON...LINN...IOWA AND BENTON COUNTIES... AT 1248 AM CDT...DOPPLER RADAR INDICATED BETWEEN 3 AND 5.5 INCHES OF RAIN HAD FALLEN ACROSS MUCH OF THE WARNED AREA. THE HARDEST HIT AREA APPEARS TO BE SOUTHERN LINN COUNTY AND NORTHERN JOHNSON COUNTY. WHILE RAIN RATES HAVE DIMINISHED...THE THREAT OF FLASH FLOODING PERSISTS. LOCATIONS UNDER THREAT OF FLASH FLOODING INCLUDE... CEDAR RAPIDS...IOWA CITY...VINTON...MARENGO...WEST BRANCH...MARION... CORALVILLE...NORTH LIBERTY...HIAWATHA...MOUNT VERNON...ROBINS... WILLIAMSBURG...BELLE PLAINE...CENTER POINT...LISBON...FAIRFAX... SOLON...TIFFIN...ELY AND ATKINS. PRECAUTIONARY/PREPAREDNESS ACTIONS... BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING...PARTICULARLY ON RURAL ROADS. IN HILLY TERRAIN THERE ARE LOW WATER CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED ROADS. FIND AN ALTERNATE ROUTE. PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU CAN DO SO SAFELY. && LAT...LON 4230 9230 4229 9136 4162 9137 4163 9230 $$ WOLF
651 WGUS73 KDVN 120828 FFSDVN FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA/IL 328 AM CDT FRI AUG 12 2016 IAC011-095-103-113-120837- /O.EXP.KDVN.FF.W.0021.000000T0000Z-160812T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JOHNSON IA-LINN IA-IOWA IA-BENTON IA- 328 AM CDT FRI AUG 12 2016 ...THE FLASH FLOOD WARNING FOR JOHNSON...LINN...IOWA AND BENTON COUNTIES WILL EXPIRE AT 330 AM CDT... THE HEAVY RAIN HAS ENDED ALTHOUGH LIGHT RAIN WILL CONTINUE FOR A FEW HOURS. THUS FLASH FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES. LAT...LON 4230 9230 4229 9136 4162 9137 4163 9230 $$ WOLF
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:00 PM CDT | Special Weather Statement | DVN | Benton, Buchanan, Delaware, Dubuque, Jackson, Jones and 1 more | 60 min |
| Aug 11, 7:48 PM CDT | Flash Flood Warning | DVN | Linn | 3 hr |
| Aug 11, 8:16 PM CDT | Special Weather Statement | DVN | Iowa, Jackson, Jones | 59 min |
| Aug 11, 8:57 PM CDT | Special Weather Statement | DVN | Benton, Cedar, Clinton, Iowa, Jackson, Johnson and 3 more | 93 min |
| Aug 11, 9:15 PM CDT | River Flood Watch | DVN | Clinton, Scott | 4 days |
| Aug 11, 9:53 PM CDT | River Flood Watch | DVN | Iowa, Johnson | 4 days |
| Aug 11, 9:53 PM CDT | River Flood Watch | DVN | Johnson, Washington | 4 days |
| Aug 11, 10:33 PM CDT | Special Weather Statement | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 10 more | 87 min |
| Aug 11, 11:05 PM CDT | Flash Flood Warning | DVN | Cedar | 6 hr |
| Aug 11, 11:53 PM CDT | Special Weather Statement | DVN | Clinton, Des Moines, Henry, Jefferson, Keokuk, Louisa and 4 more | 67 min |
| Aug 12, 2:29 AM CDT | Special Weather Statement | DVN | Des Moines, Henry, Jefferson, Louisa, Van Buren | 2 hr |
| Aug 12, 7:26 AM CDT | River Flood Warning | DVN | Clinton, Scott | 4 days |
| Aug 12, 8:50 AM CDT | River Flood Warning | DVN | Cedar, Louisa, Muscatine | 4 days |
| Aug 12, 8:50 AM CDT | River Flood Warning | DVN | Iowa | 4 days |
| Aug 12, 8:50 AM CDT | River Flood Warning | DVN | Johnson, Washington | 4 days |
| Aug 12, 10:05 AM CDT | Areal Flood Warning | DVN | Benton, Buchanan, Cedar, Clinton, Iowa, Johnson and 4 more | 9 hr |
| Aug 12, 10:44 AM CDT | River Flood Watch | DVN | Louisa | 6 days |
| Aug 12, 10:44 AM CDT | River Flood Watch | DVN | Louisa | 5 days |
| Aug 12, 10:44 AM CDT | River Flood Watch | DVN | Louisa | 5 days |
Nearby
Flash Flood Warnings in Iowa, 2016Every flash flood warning in 2016
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.