Alert archive / Iowa / Flash Flood Warnings in 2017
Flash Flood Warning 20, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Jul 21, 2017, 11:54 PM CDT for Chickasaw County, Floyd County, Iowa. It was in force for 10 hr. 12 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, 11:54 PM CDT (04:54 UTC)
- Expired
- Jul 22, 2017, 9:46 AM CDT
- In force
- 10 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Chickasaw County, IA, Floyd County, IA
The radar
The La Crosse radar (KARX), 141 km from the middle of the area, began a volume at 04:56 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, 2:25 AM CDT | HEAVY RAIN 3.84 | 3 E Charles City, IA | THE DURATION OF THE HEAVY RAIN EVENT WAS 4 HOURS. |
| Jul 22, 2:25 AM CDT | HEAVY RAIN 3.84 | 3 E Charles City, IA | |
| Jul 22, 3:00 AM CDT | FLASH FLOOD | 5 Nw Nashua, IA | PARTIAL WASHOUT OF A ROAD NEAR THE INTERSECTION OF 240TH STREET AND VISTA LANE. |
| Jul 22, 3:00 AM CDT | FLASH FLOOD | 5 Sw Bassett, IA | PARTIAL WASHOUT OF RAILROAD CROSSING NEAR THE INTERSECTION OF WALNUT AVENUE AND 230TH STREET. |
| Jul 22, 6:45 AM CDT | HEAVY RAIN 2.4 | 3 Sse Rockford, IA | MESONET STATION RKFI4, ROCKFORD-SHELL ROCK RVR. |
| Jul 22, 6:55 AM CDT | HEAVY RAIN 5.01 | 3 E Charles City, IA | AWOS STATION CCY, CHARLES CITY AIRPORT. |
| Jul 22, 7:00 AM CDT | HEAVY RAIN 5.58 | New Hampton, IA | COCORAHS STATION IA-CW-3, NEW HAMPTON. |
| Jul 22, 7:00 AM CDT | HEAVY RAIN 5.99 | New Hampton, IA | COCORAHS STATION IA-CW-2, NEW HAMPTON. |
| Jul 22, 7:00 AM CDT | HEAVY RAIN 6.63 | 1 Sse Charles City, IA | CO-OP OBSERVER STATION CIYI4, CHARLES CITY. |
| Jul 22, 7:00 AM CDT | HEAVY RAIN 7 | New Hampton, IA | STORM TOTAL. |
| Jul 22, 7:30 AM CDT | HEAVY RAIN 6.01 | 1 Sse Charles City, IA | MESONET STATION CCYI4, CHARLES CITY-CEDAR RIVER. |
| Jul 22, 7:30 AM CDT | HEAVY RAIN 6.01 | Charles City, IA | MESONET STATION CCYI4, CHARLES CITY-CEDAR RIVER. |
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, 4.9 hours before the alert went out and 212 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.
620
WGUS53 KARX 220454
FFWARX
IAC037-067-221045-
/O.NEW.KARX.FF.W.0020.170722T0454Z-170722T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
1154 PM CDT FRI JUL 21 2017
The National Weather Service in La Crosse has issued a
* Flash Flood Warning for...
Floyd County in north central Iowa...
Northern Chickasaw County in northeastern Iowa...
* Until 545 AM CDT
* At 1152 PM CDT, law enforcement reports thunderstorms producing
heavy rain and flash flooding across the warned area. 2 to 3
inches of have fallen since 10 pm, with another 1 to 3 inches
expected through early morning. Flash flooding has been reported
in Charles City, and is likely ongoing in many other areas.
* Some locations that will experience flooding include...
Charles City, New Hampton, Nashua, Nora Springs, Rockford, Lawler,
Rudd, Floyd, Marble Rock, North Washington, Colwell, County Roads V
56 And B 33, County Roads B 60 And T 64, County Roads B 33 And T
76, County Roads B 20 And T 26, Carrville, Highway 14 And County
Road B 60, Little Turkey, Roseville and Oakwood.
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.
&&
LAT...LON 4320 9302 4316 9208 4304 9208 4307 9255
4295 9255 4297 9302
$$
Lawrence4 follow-up statements
029
WGUS73 KARX 220714
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
214 AM CDT SAT JUL 22 2017
IAC037-067-221045-
/O.CON.KARX.FF.W.0020.000000T0000Z-170722T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Floyd IA-Chickasaw IA-
214 AM CDT SAT JUL 22 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 AM CDT FOR
FLOYD AND NORTHERN CHICKASAW COUNTIES...
At 208 AM CDT, local law enforcement reported continued flash
flooding across the area, with several reports of water flowing over
roads.
Rainfall is gradually coming to an end across the area, though flash
flooding will continue through sunrise as runoff continues.
Some locations that will experience flooding include...
Charles City, New Hampton, Nashua, Nora Springs, Rockford, Lawler,
Rudd, Floyd, Marble Rock, North Washington, Colwell, County Roads V
56 And B 33, County Roads B 60 And T 64, County Roads B 33 And T 76,
County Roads B 20 And T 26, Carrville, Highway 14 And County Road B
60, Little Turkey, Roseville and Oakwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4320 9302 4316 9208 4304 9208 4307 9255
4295 9255 4297 9302
$$
DL415
WGUS73 KARX 220755
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
255 AM CDT SAT JUL 22 2017
IAC037-067-221045-
/O.CON.KARX.FF.W.0020.000000T0000Z-170722T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Floyd IA-Chickasaw IA-
255 AM CDT SAT JUL 22 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 AM CDT FOR
FLOYD AND NORTHERN CHICKASAW COUNTIES...
At 253 AM CDT, local law enforcement reported flash flooding across
parts of the area. The heaviest rain has shifted south of the area
but flash flooding continues, especially over Chickasaw county. Some
roads may be washed out in spots or have water flowing over them.
Some locations that will experience flooding include...
Charles City, New Hampton, Nashua, Nora Springs, Rockford, Lawler,
Rudd, Floyd, Marble Rock, North Washington, Colwell, County Roads V
56 And B 33, County Roads B 60 And T 64, County Roads B 33 And T 76,
County Roads B 20 And T 26, Carrville, Highway 14 And County Road B
60, Little Turkey, Roseville and Oakwood.
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.
&&
LAT...LON 4320 9302 4316 9208 4304 9208 4307 9255
4295 9255 4297 9302
$$
Wetenkamp389
WGUS53 KARX 221015
FFWARX
IAC037-067-221515-
/O.EXT.KARX.FF.W.0020.000000T0000Z-170722T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
515 AM CDT SAT JUL 22 2017
The National Weather Service in La Crosse has extended the
* Flash Flood Warning for...
Floyd County in north central Iowa...
Northern Chickasaw County in northeastern Iowa...
* Until 1015 AM CDT
* At 513 AM CDT, some areas of flash flooding continue, especially
across southern portions of Floyd County due to 3 to 7 inches of
earlier rainfall.
* Some locations that will experience flooding may include...
Charles City, New Hampton, Nashua, Nora Springs, Rockford, Lawler,
Rudd, Floyd, Marble Rock, North Washington, Colwell, County Roads V
56 And B 33, County Roads B 60 And T 64, County Roads B 33 And T
76, County Roads B 20 And T 26, Carrville, Highway 14 And County
Road B 60, Little Turkey, Roseville and Oakwood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4320 9302 4316 9208 4304 9208 4307 9255
4295 9255 4297 9302
$$
Lawrence008
WGUS73 KARX 221446
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
946 AM CDT SAT JUL 22 2017
IAC037-067-221453-
/O.CAN.KARX.FF.W.0020.000000T0000Z-170722T1515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Floyd IA-Chickasaw IA-
946 AM CDT SAT JUL 22 2017
...THE FLASH FLOOD WARNING FOR FLOYD AND NORTHERN CHICKASAW COUNTIES
IS CANCELLED...
Law enforcement reported that flood waters have receded but numerous
roads are washed out. Flooding is no longer expected to pose a
threat but please continue to heed any road closures.
LAT...LON 4320 9302 4316 9208 4304 9208 4307 9255
4295 9255 4297 9302
$$
DASThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 9:06 PM CDT | River Flood Warning | ARX | Clayton | 38 hr |
| Jul 21, 9:06 PM CDT | River Flood Warning | ARX | Clayton | 63 hr |
| Jul 21, 10:18 PM CDT | Flash Flood Warning | ARX | Chickasaw, Clayton, Fayette | 12 hr |
| Jul 22, 1:21 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard, Winneshiek | 39 min |
| Jul 22, 9:56 AM CDT | Areal Flood Warning | ARX | Clayton | 24 hr |
| Jul 22, 10:09 AM CDT | Areal Flood Warning | ARX | Chickasaw, Clayton, Fayette | 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.