Alert archive / Iowa / Flash Flood Warnings in 2021

Flash Flood Warning 15, NWS Quad Cities, IA

August 25, 2021Iowa County, Keokuk County, Washington County, Iowa

NWS Quad Cities, IA issued this flash flood warning at Aug 25, 2021, 7:15 AM CDT for Iowa County, Keokuk County, Washington County, Iowa. It was in force for 4 hr. 5 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: Aug 25, 2021, 7:15 AM CDT (12:15 UTC)
Expired: Aug 25, 2021, 11:24 AM CDT
In force: 4 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

Counties Iowa County, IA, Keokuk County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 111 km from the middle of the area, began a volume at 12:14 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
Aug 25, 7:40 AM CDT	HEAVY RAIN 3.2	Parnell, IA	RAINFALL THIS MORNING - STILL RAINING AND LOTS OF STANDING WATER.
Aug 25, 7:52 AM CDT	FLASH FLOOD	Parnell, IA	NON-SPECIFIC REPORT FROM MPING FOR RIVER/CREEK OVERFLOWING; OR CROPLAND OR YARD OR BASEMENT FLOODING.
Aug 25, 7:55 AM CDT	FLASH FLOOD	Parnell, IA	LOTS OF STANDING WATER. ONE LOW LYING STREET FLOODED.
Aug 25, 7:59 AM CDT	HEAVY RAIN 3.45	1 Ese Williamsburg, IA	STILL RAINING.
Aug 25, 8:40 AM CDT	HEAVY RAIN 3.08	1 Ene North English, IA

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 12:00Z, 0.3 hours before the alert went out and 118 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: 818 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1355 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

274 
WGUS53 KDVN 251215
FFWDVN
IAC095-107-183-251815-
/O.NEW.KDVN.FF.W.0015.210825T1215Z-210825T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
715 AM CDT Wed Aug 25 2021

The National Weather Service in Quad Cities has issued a

* Flash Flood Warning for...
  Southeastern Iowa County in east central Iowa...
  Northeastern Keokuk County in southeastern Iowa...
  Northwestern Washington County in southeastern Iowa...

* Until 115 PM CDT.

* At 715 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches 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...
  Williamsburg, Wellman, North English, Parnell, Kinross and 
  Holbrook.

This includes the following highways...
	Interstate 80 in Iowa between mile markers 217 and 228.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4170 9208 4170 9184 4163 9183 4160 9183
      4153 9183 4151 9183 4145 9183 4141 9207

FLASH FLOOD...RADAR INDICATED

$$

McClure

4 follow-up statements

604 
WGUS73 KDVN 251238
FFSDVN

Flash Flood Statement
National Weather Service Quad Cities IA IL
738 AM CDT Wed Aug 25 2021

IAC095-107-183-251815-
/O.CON.KDVN.FF.W.0015.000000T0000Z-210825T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iowa IA-Keokuk IA-Washington IA-
738 AM CDT Wed Aug 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN IOWA, NORTHEASTERN KEOKUK AND 
NORTHWESTERN WASHINGTON COUNTIES...

At 738 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. Additional rainfall amounts of 1 to 2 inches 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...
  Williamsburg, Wellman, North English, Parnell, Kinross and 
  Holbrook.

This includes the following highways...
	Interstate 80 in Iowa between mile markers 217 and 228.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4170 9208 4170 9184 4163 9183 4160 9183
      4153 9183 4151 9183 4145 9183 4141 9207

FLASH FLOOD...RADAR INDICATED

$$

McClure

078 
WGUS73 KDVN 251251
FFSDVN

Flash Flood Statement
National Weather Service Quad Cities IA IL
751 AM CDT Wed Aug 25 2021

IAC095-107-183-251815-
/O.CON.KDVN.FF.W.0015.000000T0000Z-210825T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iowa IA-Keokuk IA-Washington IA-
751 AM CDT Wed Aug 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN IOWA, NORTHEASTERN KEOKUK AND 
NORTHWESTERN WASHINGTON COUNTIES...

At 751 AM CDT, Trained weather spotters reported heavy rain of 3.20 
inches of rain in Parnell since 5 AM with a considerable amount of 
standing water. Between 2 and 4 inches of rain have fallen within 
the warning area. Additional rainfall amounts of 1 to 2 inches are 
possible in the warned area. Flash flooding is ongoing or expected 
to begin shortly.

HAZARD...Flash flooding caused by heavy rain.

SOURCE...Trained spotters reported.

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...
  Williamsburg, Wellman, North English, Parnell, Kinross and 
  Holbrook.

This includes the following highways...
	Interstate 80 in Iowa between mile markers 217 and 228.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4170 9208 4170 9184 4163 9183 4160 9183
      4153 9183 4151 9183 4145 9183 4141 9207

FLASH FLOOD...OBSERVED

$$

McClure

034 
WGUS73 KDVN 251303
FFSDVN

Flash Flood Statement
National Weather Service Quad Cities IA IL
803 AM CDT Wed Aug 25 2021

IAC095-107-183-251815-
/O.CON.KDVN.FF.W.0015.000000T0000Z-210825T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iowa IA-Keokuk IA-Washington IA-
803 AM CDT Wed Aug 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN IOWA, NORTHEASTERN KEOKUK AND 
NORTHWESTERN WASHINGTON COUNTIES...

At 803 AM CDT, A trained weather spotter reported a low lying street 
flooded in Parnell. Between 2 and 4 inches of rain have fallen. 
Flash flooding is already occurring.

HAZARD...Flash flooding caused by heavy rain.

SOURCE...Trained spotters reported.

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...
  Williamsburg, Wellman, North English, Parnell, Kinross and 
  Holbrook.

This includes the following highways...
	Interstate 80 in Iowa between mile markers 217 and 228.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4170 9208 4170 9184 4163 9183 4160 9183
      4153 9183 4151 9183 4145 9183 4141 9207

FLASH FLOOD...OBSERVED

$$

McClure

078 
WGUS73 KDVN 251624
FFSDVN

Flash Flood Statement
National Weather Service Quad Cities IA IL
1124 AM CDT Wed Aug 25 2021

IAC095-107-183-251634-
/O.CAN.KDVN.FF.W.0015.000000T0000Z-210825T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iowa IA-Keokuk IA-Washington IA-
1124 AM CDT Wed Aug 25 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN IOWA, 
NORTHEASTERN KEOKUK AND NORTHWESTERN WASHINGTON COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 4170 9208 4170 9184 4163 9183 4160 9183
      4153 9183 4151 9183 4145 9183 4141 9207

$$

Sheets

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 3:53 AM CDT	Special Weather Statement	DVN	Jefferson	37 min

Nearby

Flash Flood Warnings in Iowa, 2021 Every 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.