Alert archive / Iowa / Flash Flood Warnings in 2016

Flash Flood Warning 35, NWS Des Moines, IA

September 22, 20164 counties in Iowa

NWS Des Moines, IA issued this flash flood warning at Sep 22, 2016, 11:24 PM CDT for 4 counties in Iowa. It was in force for 6 hr. 8 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, 11:24 PM CDT (04:24 UTC)
Expired: Sep 23, 2016, 5:15 AM CDT
In force: 6 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

Counties Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Franklin County, IA

The radar

The Des Moines radar (KDMX), 138 km from the middle of the area, began a volume at 04:23 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
Sep 23, 2:42 AM CDT	FLOOD	1 Nnw Shell Rock, IA	IOWA DEPARTMENT OF TRANSPORTATION AND LOCAL LAW ENFORCEMENT HAVE CLOSED HIGHWAY 3 BETWEEN COUNTY ROAD T55 NEAR CLARKSVILLE AND US 218 NEAR SHELL ROCK DUE TO THE SHELL ROCK RIVER.
Sep 23, 3:03 AM CDT	FLOOD	1 Sse Clarksville, IA	IOWA 188 IS CLOSED BETWEEN IA 3 AND COUNTY ROAD T64 (SOUTH OF CLARKSVILLE). THE ROAD IS BLOCKED BECAUSE OF FLOODING FROM THE SHELL ROCK RIVER.
Sep 23, 3:19 AM CDT	FLASH FLOOD	4 Wsw Geneva, IA	WATER FLOWING OVER FEDERAL HIGHWAY 65 SOUTH OF 95TH STREET IN FRANKLIN COUNTY.
Sep 23, 4:00 AM CDT	FLASH FLOOD	4 Sse Coulter, IA	NUMEROUS SECONDARY ROADS IN FRANKLIN COUNTY WITH WATER OVER THEM TO VARY DEPTHS. SOME ROADS ARE CLOSED.
Sep 23, 4:45 AM CDT	FLOOD	1 Se Waverly, IA	ALL OF SOUTHEAST PORTION OF WAVERLY HAS BEEN EVACUATED DUE TO THE CEDAR RIVER FLOODING ...TIME OF EVACUATION UNKNOWN .
Sep 23, 4:45 AM CDT	FLASH FLOOD	3 Ene Waverly, IA	NORTHEAST OF WAVERLY ALONG V21 OR IVORY AVENUE, A BRIDGE HAS WATER FLOWING OVER IT DUE TO BASKINS RUN.
Sep 23, 4:45 AM CDT	FLASH FLOOD	Denver, IA	IN DENVER, ALONG FOREST AVENUE, AN OFFICER IS NOTIFYING RESIDENTS TO EVACUATE DUE TO THE CREEK FLOODING NORTHERN PART OF TOWN.
Sep 23, 5:00 AM CDT	FLASH FLOOD	3 S Clarksville, IA	WATER UP TO THE WHEEL WELLS OF A PICKUP TRUCK ALONG 220TH ST NEAR TERRACE AVENUE.

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, 4.4 hours before the alert went out and 230 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

004 
WGUS53 KDMX 230424
FFWDMX
IAC017-023-033-069-231015-
/O.NEW.KDMX.FF.W.0035.160923T0424Z-160923T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1124 PM CDT THU SEP 22 2016

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BUTLER COUNTY IN NORTH CENTRAL IOWA...
  SOUTHERN CERRO GORDO COUNTY IN NORTH CENTRAL IOWA...
  FRANKLIN COUNTY IN NORTH CENTRAL IOWA...
  BREMER COUNTY IN NORTHEASTERN IOWA...

* UNTIL 515 AM CDT.

* AT 1117 PM CDT...ADDITIONAL STORMS ARE IMPACTING THE AREAS OF
  NORTHEAST IOWA THAT SAW EXTREMELY HEAVY RAINS LAST NIGHT. SOILS
  REMAIN SATURATED AND RIVERS REMAIN ABOVE FLOOD STAGE. RAINS FROM
  STORMS TONIGHT WILL ONLY AID TO PROLONG OR EXACERBATE ONGOING
  FLOODING CONCERNS. IN ADDITION...THE LEVEE ON THE SHELL ROCK RIVER
  IN CLARKSVILLE HAS FAILED AND EVACUATIONS ARE UNDERWAY IN THE
  TOWN. TWO INCHES OF RAIN WITH LOCALLY HIGHER AMOUNTS ARE POSSIBLE
  THROUGH THE COURSE OF THE NIGHT FROM THESE STORMS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WAVERLY...HAMPTON...ALLISON...SUMNER...DENVER...CLARKSVILLE...
  TRIPOLI...SHELL ROCK...SHEFFIELD...GREENE...ROCKWELL...
  JANESVILLE...READLYN...DUMONT...LATIMER...PLAINFIELD...THORNTON...
  COULTER...MESERVEY AND FREDERIKA.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 158 AND 188.
 
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...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4264 9349 4305 9349 4305 9302 4291 9302
      4291 9208 4264 9208

$$

SKOW

1 follow-up statement

647 
WGUS73 KDMX 230804
FFSDMX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
304 AM CDT FRI SEP 23 2016

IAC017-023-033-069-231015-
/O.CON.KDMX.FF.W.0035.000000T0000Z-160923T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUTLER IA-CERRO GORDO IA-FRANKLIN IA-BREMER IA-
304 AM CDT FRI SEP 23 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM CDT FOR
BUTLER...SOUTHERN CERRO GORDO...FRANKLIN AND BREMER COUNTIES...

AT 300 AM CDT...THE FIRST WAVE OF SHOWERS AND STORMS HAD CLEARED THE
WARNED AREA. HOWEVER...ADDITIONAL STORMS WERE FORMING JUST TO THE
WEST AND WILL BE ENTERING THE AREA SHORTLY. THE COMBINATION OF THE
HEAVY RAIN TONIGHT ON TOP OF SATURATED SOILS AND ALREADY FLOODED
RIVERS WILL ONLY AID TO PROLONG OR EXACERBATE ONGOING FLOODING
CONCERNS. IN ADDITION...THE LEVEE ON THE SHELL ROCK RIVER IN
CLARKSVILLE FAILED SHORTLY AFTER 10 PM...RESULTING IN THE FLOODING
OF A SIGNIFICANT AREA OF THE TOWN. AN ADDITIONAL ONE TO TWO INCHES
OF RAIN WITH LOCALLY HIGHER AMOUNTS ARE POSSIBLE THROUGH THE REST OF
THE NIGHT FROM THESE STORMS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
WAVERLY...HAMPTON...ALLISON...SUMNER...DENVER...CLARKSVILLE...
TRIPOLI...SHELL ROCK...SHEFFIELD...GREENE...ROCKWELL...JANESVILLE...
READLYN...DUMONT...LATIMER...PLAINFIELD...THORNTON...COULTER...
MESERVEY AND FREDERIKA.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 158 AND 188.
 
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...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4264 9349 4305 9349 4305 9302 4291 9302
      4291 9208 4264 9208

$$

SKOW

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 22, 9:16 PM CDT	Special Weather Statement	DMX	Polk	29 min
Sep 22, 9:37 PM CDT	Flash Flood Warning	DMX	Story	6 hr
Sep 23, 12:22 AM CDT	River Flood Warning	DMX	Story	31 hr
Sep 23, 1:14 AM CDT	River Flood Warning	DMX	Polk, Story	33 hr
Sep 23, 1:22 AM CDT	Flash Flood Warning	DMX	Hancock, Wright	6 hr
Sep 23, 3:36 AM CDT	Flash Flood Warning	DMX	Franklin, Humboldt, Kossuth, Wright	6 hr
Sep 23, 5:19 AM CDT	Areal Flood Warning	DMX	Butler, Franklin	6 hr
Sep 23, 5:42 AM CDT	Flash Flood Warning	DMX	Palo Alto, Pocahontas	4 hr
Sep 23, 7:15 AM CDT	Areal Flood Warning	DMX	Hancock, Wright	4 hr
Sep 23, 11:12 AM CDT	Areal Flood Warning	DMX	Black Hawk, Bremer, Butler, Franklin, Hancock, Wright	48 hr

Nearby

Flash Flood Warnings in Iowa, 2016 Every 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.