Alert archive / Iowa / Flash Flood Warnings in 2016
Flash Flood Warning 31, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Sep 21, 2016, 8:54 PM CDT for Bremer County, Iowa. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 21, 2016, 8:54 PM CDT (01:54 UTC)
- Expired
- Sep 22, 2016, 3:00 AM CDT
- In force
- 6 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), 149 km from the middle of the area, began a volume at 01:57 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.9 hours before the alert went out and 201 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
- 560 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 1439 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 249 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
347 WGUS53 KDMX 220154 FFWDMX IAC017-220800- /O.NEW.KDMX.FF.W.0031.160922T0154Z-160922T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 854 PM CDT WED SEP 21 2016 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... BREMER COUNTY IN NORTHEASTERN IOWA... * UNTIL 300 AM CDT THURSDAY. * AT 853 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UPWARDS OF 6 PLUS INCHES OF RAIN HAVE FALLEN IN AREAS TO THE WEST AND NORTHWEST AND HAVE BEGUN TO MOVE INTO THE WARNED AREA WHERE 2 PLUS INCHES HAVE ALREADY FALLEN IN PLACES. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. * SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... WAVERLY...SUMNER...TRIPOLI...READLYN...PLAINFIELD...FREDERIKA AND WAVERLY MUNICIPAL AIRPORT. ADDITIONAL RAINFALL AMOUNTS OF 4 OR MORE INCHES ARE POSSIBLE IN THE WARNED AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES. && LAT...LON 4274 9255 4291 9255 4291 9208 4264 9208 $$ CURTIS
1 follow-up statement
309 WGUS73 KDMX 220424 FFSDMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1124 PM CDT WED SEP 21 2016 IAC017-220800- /O.CON.KDMX.FF.W.0031.000000T0000Z-160922T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BREMER IA- 1124 PM CDT WED SEP 21 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 AM CDT FOR NORTHWESTERN BREMER COUNTY... AT 1120 PM CDT...THE THREAT FOR FLASH FLOODING CONTINUES ACROSS THE WARNED AREA. UPWARDS OF FIVE INCHES OF RAIN FELL OVER NORTHWEST BREMER COUNTY THIS EVENING. THIS WILL LEAD TO EXTREMELY RAPID RISES ON AREA STREAMS AND IN LOW AREAS PRONE TO FLOODING. ADDITIONAL HEAVY RAINFALL IS ALSO FORECAST TONIGHT WHICH MAY EXACERBATE THE FLOODING CONDITIONS. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... TRIPOLI...PLAINFIELD AND FREDERIKA. PRECAUTIONARY/PREPAREDNESS ACTIONS... BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING SPOTS. && LAT...LON 4274 9255 4291 9255 4291 9218 4281 9226 $$ SKOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 7:05 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 55 min |
| Sep 21, 7:16 PM CDT | Tornado Warning | DMX | Cerro Gordo | 13 min |
| Sep 21, 7:43 PM CDT | Tornado Warning | DMX | Bremer, Butler | 47 min |
| Sep 21, 8:26 PM CDT | Special Weather Statement | DMX | Bremer | 64 min |
| Sep 21, 9:05 PM CDT | Special Weather Statement | DMX | Bremer | 40 min |
| Sep 21, 9:39 PM CDT | River Flood Warning | DMX | Black Hawk, Bremer, Butler | 5 days |
| Sep 21, 9:40 PM CDT | River Flood Warning | DMX | Black Hawk | 8 days |
| Sep 21, 9:41 PM CDT | River Flood Warning | DMX | Black Hawk, Bremer, Butler | 6 days |
| Sep 21, 9:50 PM CDT | River Flood Warning | DMX | Cerro Gordo, Floyd, Worth | 4 days |
| Sep 21, 10:51 PM CDT | Areal Flood Warning | DMX | Cerro Gordo, Franklin, Worth | 48 hr |
| Sep 22, 3:05 AM CDT | Areal Flood Warning | DMX | Bremer | 24 hr |
| Sep 22, 4:13 AM CDT | Flash Flood Warning | DMX | Cerro Gordo, Hancock | 6 hr |
| Sep 22, 7:00 AM CDT | Flash Flood Warning | DMX | Butler | 4 hr |
| Sep 22, 10:22 AM CDT | River Flood Warning | DMX | Wright | 6 days |
| Sep 22, 11:23 AM CDT | Areal Flood Warning | DMX | Bremer, Butler | 24 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.