Alert archive / Iowa / Flash Flood Warnings in 2021
Flash Flood Warning 4, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Jun 25, 2021, 11:37 PM CDT for Linn County, Iowa. It was in force for 101 min. 2 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
- Jun 25, 2021, 11:37 PM CDT (04:37 UTC)
- Expired
- Jun 26, 2021, 1:18 AM CDT
- In force
- 101 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Flood severity
- None
County Linn County, IA
The radar
The Quad Cities radar (KDVN), 96 km from the middle of the area, began a volume at 04:35 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 |
|---|---|---|---|
| Jun 25, 11:41 PM CDT | FLASH FLOOD | 1 Ne Marion, IA | CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 1 NE MARION. DEEP FLOWING WATER AT 35TH STREET AND MCGOWAN BOULEVARD. |
| Jun 26, 12:02 AM CDT | HEAVY RAIN 6.76 | 1 Ne Marion, IA | CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 1 NE MARION. |
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, 4.6 hours before the alert went out and 101 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
- 316 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 897 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.8
The text
As transmitted.
538
WGUS53 KDVN 260437
FFWDVN
IAC113-260730-
/O.NEW.KDVN.FF.W.0004.210626T0437Z-210626T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
1137 PM CDT Fri Jun 25 2021
The National Weather Service in Quad Cities has issued a
* Flash Flood Warning for...
Central Linn County in east central Iowa...
* Until 230 AM CDT.
* At 1137 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 6 inches of rain
have fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Cedar Rapids, Marion, Springville, Whittier, Marion Airport and
Squaw Creek Park.
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 4204 9166 4215 9153 4208 9139 4199 9161
FLASH FLOOD...RADAR INDICATED
$$
Uttech2 follow-up statements
570
WGUS73 KDVN 260500
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
1200 AM CDT Sat Jun 26 2021
IAC113-260730-
/O.CON.KDVN.FF.W.0004.000000T0000Z-210626T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Linn IA-
1200 AM CDT Sat Jun 26 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM CDT SATURDAY
FOR CENTRAL LINN COUNTY...
At 1200 AM CDT, trained spotters reported thunderstorms producing
heavy rain across the warned area. Between 3 and 6 inches of rain
have fallen. Flash flooding is ongoing or expected to begin shortly.
Additional rainfall of less than a half inch is anticipated.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Cedar Rapids, Marion, Springville, Whittier, Marion Airport and
Squaw Creek Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4204 9166 4215 9153 4208 9139 4199 9161
FLASH FLOOD...OBSERVED
$$
Uttech272 WGUS73 KDVN 260618 FFSDVN Flash Flood Statement National Weather Service Quad Cities IA IL 118 AM CDT Sat Jun 26 2021 IAC113-260628- /O.CAN.KDVN.FF.W.0004.000000T0000Z-210626T0730Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Linn IA- 118 AM CDT Sat Jun 26 2021 ...FLASH FLOOD WARNING FOR CENTRAL LINN COUNTY HAS BEEN REPLACED WITH A FLOOD WARNING... The heavy rain across the warned area has ended and little additional rainfall is expected overnight. Any residual flood waters should continue to slowly recede. If you encounter water over roadways do not attempt to drive through it. LAT...LON 4204 9166 4215 9153 4208 9139 4199 9161 $$ Uttech
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 7:54 PM CDT | Special Weather Statement | DVN | Linn | 21 min |
| Jun 25, 9:18 PM CDT | Special Weather Statement | DVN | Des Moines, Henry, Lee | 27 min |
| Jun 25, 10:51 PM CDT | Special Weather Statement | DVN | Linn | 39 min |
| Jun 25, 10:59 PM CDT | Special Weather Statement | DVN | Benton | 46 min |
| Jun 26, 12:05 AM CDT | Special Weather Statement | DVN | Benton | 40 min |
| Jun 26, 1:18 AM CDT | Areal Flood Warning | DVN | Linn | 5 hr |
| Jun 26, 6:49 PM CDT | Special Weather Statement | DVN | Iowa | 26 min |
Nearby
Flash Flood Warnings in Iowa, 2021Every flash flood warning in 2021
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.