Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 53, NWS La Crosse, WI

September 22, 2016Chickasaw County, Floyd County, Iowa

NWS La Crosse, WI issued this flash flood warning at Sep 22, 2016, 3:55 AM CDT for Chickasaw County, Floyd County, Iowa. It was in force for 4 hr. 7 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
Sep 22, 2016, 3:55 AM CDT (08:55 UTC)
Expired
Sep 22, 2016, 8:15 AM CDT
In force
4 hr
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Emergency
Flash flood emergency
Flood severity
None

Counties Chickasaw County, IA, Floyd County, IA

The radar

The La Crosse radar (KARX), 151 km from the middle of the area, began a volume at 08:54 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

TimeReportWhereRemark
Sep 22, 4:45 AM CDTHEAVY RAIN 5.282 Sse Bassett, IACO-OP OBSERVER STATION IONIA 2W /IONI4/. THE DURATION OF THE HEAVY RAIN EVENT WAS 24 HOURS.
Sep 22, 4:45 AM CDTHEAVY RAIN 5.282 Wsw Ionia, IACO-OP OBSERVER STATION IONIA 2W /IONI4/. THE DURATION OF THE HEAVY RAIN EVENT WAS 24 HOURS.
Sep 22, 4:56 AM CDTFLASH FLOODNashua, IAFIRE DEPT PUMPING WATER OUT OF BASEMENTS IN NASHUA. .
Sep 22, 6:30 AM CDTHEAVY RAIN 7.552 Wsw Nashua, IACO-OP OBSERVER STATION NASHUA 2SW /NHUI4/.
Sep 22, 6:55 AM CDTHEAVY RAIN 4.793 E Charles City, IAAWOS STATION CHARLES CITY AIRPORT /CCY/.
Sep 22, 7:00 AM CDTHEAVY RAIN 6.351 Sse Charles City, IACO-OP OBSERVER STATION CHARLES CITY /CIYI4/.
Sep 22, 7:00 AM CDTHEAVY RAIN 9.362 Sse Nora Springs, IACOCORAHS STATION NORA SPRINGS 2.4 SSE /IA-FL-3/.

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, 8.9 hours before the alert went out and 206 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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2016-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 144 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2016-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 428 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
144 J/kg
Mixed-layer CIN
-361 J/kg
Mixed-layer LCL
641 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
428 m²/s²
0-3 km storm-relative helicity
596 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.6

Open this sounding in Storm Lab

The text

As transmitted.

396 
WGUS53 KARX 220855
FFWARX
IAC037-067-221315-
/O.NEW.KARX.FF.W.0053.160922T0855Z-160922T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
355 AM CDT THU SEP 22 2016

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CHICKASAW COUNTY IN NORTHEASTERN IOWA...
  FLOYD COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 815 AM CDT

* THIS IS AN EXTENSION OF THE FLASH FLOOD WARNING THAT HAD BEEN IN
  EFFECT FOR CHICKASAW. THIS ALSO REPLACES THE FLASH FLOOD EMERGENCY
  FOR FLOYD COUNTY. 

* AT 349 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT THE
  FLOODING SITUATION HAD STABILIZED ACROSS THE COUNTY.  WATER
  CONTINUES TO RISE AND SANDBAGGING IS ACTIVE. MANY ROADS ARE CLOSED
  AND HAVE WATER OVER THEM ACROSS CHICKASAW AND FLOYD COUNTIES. 

* FROM 4 TO 9 INCHES OF RAIN FELL OVERNIGHT IN THIS LOCAL AREA.
  
* RIVERS...STREAMS...AND CREEKS WILL ALL BE RISING OR ARE OUT OF
  THEIR BANKS THIS MORNING. 

* USE EXTREME CAUTION IS DRIVING IN THE DARKNESS THIS MORNING. 

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 4321 9302 4321 9282 4310 9255 4291 9219
      4291 9302

$$

DAB

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 21, 7:05 PM CDTFlash Flood WarningARXChickasaw5 hr
Sep 21, 7:11 PM CDTSevere Thunderstorm WarningARXFloyd49 min
Sep 21, 7:34 PM CDTTornado WarningARXFloyd41 min
Sep 21, 8:11 PM CDTFlash Flood Warning EmergencyARXFloyd8 hr
Sep 21, 8:44 PM CDTSpecial Weather StatementARXAllamakee, Winneshiek46 min
Sep 21, 9:19 PM CDTSpecial Weather StatementARXClayton, Fayette56 min
Sep 21, 10:13 PM CDTSpecial Weather StatementARXClayton, Fayette62 min
Sep 22, 12:04 AM CDTFlash Flood WarningARXChickasaw4 hr
Sep 22, 12:13 AM CDTSpecial Weather StatementARXAllamakee, Chickasaw, Floyd, Howard, Mitchell, Winneshiek2 hr
Sep 22, 12:48 AM CDTFlash Flood WarningARXAllamakee6 hr
Sep 22, 1:00 AM CDTFlash Flood WarningARXHoward, Mitchell, Winneshiek6 hr
Sep 22, 2:20 AM CDTFlash Flood WarningARXChickasaw, Fayette, Floyd6 hr
Sep 22, 4:09 AM CDTFlash Flood WarningARXClayton6 hr
Sep 22, 4:53 AM CDTRiver Flood WarningARXMitchell3 days
Sep 22, 4:53 AM CDTRiver Flood WarningARXFloyd4 days
Sep 22, 5:39 AM CDTRiver Flood WarningARXAllamakee70 hr
Sep 22, 6:51 AM CDTFlash Flood WarningARXAllamakee3 hr
Sep 22, 7:00 AM CDTAreal Flood WarningARXHoward, Mitchell, Winneshiek6 hr
Sep 22, 8:02 AM CDTFlash Flood WarningARXChickasaw, Fayette, Floyd5 hr
Sep 22, 9:00 AM CDTRiver Flood WarningARXClayton5 days
Sep 22, 9:00 AM CDTRiver Flood WarningARXClayton4 days
Sep 22, 9:38 AM CDTFlash Flood WarningARXAllamakee3 hr
Sep 22, 10:19 AM CDTFlash Flood WarningARXClayton3 hr
Sep 22, 11:20 AM CDTRiver Flood WarningARXAllamakee, Clayton10 days
Sep 22, 11:20 AM CDTRiver Flood WarningARXClayton9 days
Sep 22, 12:58 PM CDTAreal Flood WarningARXAllamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more21 hr

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.