Alert archive / Iowa / Flash Flood Watches in 2020
Flash Flood Watch 4, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood watch at Jun 10, 2020, 3:49 AM CDT for 9 counties in Iowa. It took effect at Jun 10, 2020, 6:00 AM CDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Jun 10, 2020, 3:49 AM CDT (08:49 UTC)
- In effect from
- Jun 10, 2020, 6:00 AM CDT
- Expired
- Jun 10, 2020, 4:00 PM CDT
- In force
- 10 hr
- Issued by
- NWS Quad Cities, IA
- Flood severity
- None
Counties Benton County, IA, Buchanan County, IA, Cedar County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Johnson County, IA, Jones County, IA, Linn County, IA
The radar
The Quad Cities radar (KDVN), 94 km from the middle of the area, began a volume at 08:49 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, 8.8 hours before the alert went out and 99 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
- 104 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 203 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before this flash flood watch went out at Jun 10, 3:44 AM CDT, 5 minutes earlier.
Area forecast discussion, Jun 10, 3:44 AM CDT, 5 minutes before
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Hazardous Weather Outlook National Weather Service Quad Cities IA IL 447 AM CDT Tue Jun 9 2020 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-101000- Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson- Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll- Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren-Hancock-McDonough-Scotland-Clark- 447 AM CDT Tue Jun 9 2020 This Hazardous Weather Outlook is for portions of north central Illinois...northwest Illinois...west central Illinois...east central Iowa...northeast Iowa...southeast Iowa and northeast Missouri. .DAY ONE...TODAY AND TONIGHT Periods of heavy rain are likely Today from the remnants of tropical storm Cristobal. A Flash Flood Watch is in effect for the counties along and west of the Mississippi River. Rainfall rates up to 2 inches per hour are possible with the heaviest bands of rain. There is a Moderate risk for flash flooding roughly for areas west of the Mississippi River and a Slight risk to the east. A widespread 1 to 3 inches of rain is anticipated along and west of a line from Dubuque, Iowa to Keokuk, Iowa. Isolated amounts near 4 or 5 inches are possible. There is a low risk for a few brief spin up tornadoes area-wide through the afternoon. A Wind Advisory is in effect for Bureau and Putnam Counties through the evening for east to southeast wind gusts of 40 to 50 mph. Gusts up to 40 mph are possible futher west, extending toward the Mississippi River. The winds will turn to the southwest late this afternoon and evening. Flooding continues along portions of the Wapsipinicon River and Mississippi River. Please see the latest Flood Statements and Flood Warnings for details. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today. Rainfall amounts over 1 inch and reports of flash flooding would be appreciated. Uttech
In the hours before
Special weather statement, Jun 10, 12:23 AM CDT, 3 hours 26 minutes before
Special Weather Statement National Weather Service Quad Cities IA/IL 1223 AM CDT Wed Jun 10 2020 IAC095-101-103-107-183-100545- Keokuk-Johnson-Washington-Jefferson-Iowa- 1223 AM CDT Wed Jun 10 2020 ...A STRONG THUNDERSTORM WILL AFFECT KEOKUK...SOUTHWESTERN JOHNSON... NORTHWESTERN WASHINGTON...NORTH CENTRAL JEFFERSON AND SOUTHERN IOWA COUNTIES UNTIL 1245 AM CDT... At 1222 AM CDT, a strong thunderstorm was located over Sigourney, moving northeast at 50 mph. Winds in excess of 40 mph and pea size hail are possible with this storm. Torrential rainfall is also occurring with this storm. Locations impacted include... Sigourney, Wellman, North English, Richland, Delta, Keswick, South English, Parnell, Millersburg, Harper, Kinross, Hayesville, Keota, Ollie, Webster, Frytown, Lancaster, Lake Iowa Park, Keokuk County Expo and Lake Belva Deer Park. Minor flooding of low lying areas, creeks, streams and urban areas is possible. If you encounter water over a roadway, do not drive through it. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4112 9202 4126 9239 4166 9222 4157 9166 TIME...MOT...LOC 0522Z 209DEG 45KT 4132 9217 Uttech
Special weather statement, Jun 10, 12:45 AM CDT, 3 hours 4 minutes before
Special Weather Statement National Weather Service Quad Cities IA/IL 1245 AM CDT Wed Jun 10 2020 IAC095-103-107-183-100630- Keokuk-Johnson-Washington-Iowa- 1245 AM CDT Wed Jun 10 2020 ...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN KEOKUK... CENTRAL JOHNSON...NORTHERN WASHINGTON AND SOUTHEASTERN IOWA COUNTIES UNTIL 130 AM CDT... At 1244 AM CDT, radar indicated strong thunderstorms were located along a line extending from North English to near Washington. Movement was northeast at 40 mph. Winds in excess of 30 mph are possible. Torrential rainfall is also occurring with these storms. Locations impacted include... Iowa City, Washington, Coralville, Williamsburg, Kalona, Tiffin, Wellman, University Heights, North English, Riverside, Oxford, Hills, South English, Parnell, Kinross, Richmond, West Chester, Frytown, Windham and Johnson County Fairgrounds. This includes Interstate 80 in Iowa between mile markers 220 and 240. Minor flooding of low lying areas, creeks, streams and urban areas is possible. If you encounter water over a roadway, do not drive through it. Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 4179 9190 4162 9138 4128 9175 4150 9223 TIME...MOT...LOC 0544Z 219DEG 37KT 4153 9211 4137 9175 Uttech
Special weather statement, Jun 10, 1:09 AM CDT, 2 hours 40 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
109 AM CDT Wed Jun 10 2020
ILC131-161-195-IAC031-139-163-100645-
Rock Island-Mercer-Whiteside-Cedar-Scott-Muscatine-
109 AM CDT Wed Jun 10 2020
...A STRONG THUNDERSTORM WILL AFFECT ROCK ISLAND...NORTHWESTERN
MERCER...WESTERN WHITESIDE...SOUTHEASTERN CEDAR...SCOTT AND
NORTHEASTERN MUSCATINE COUNTIES UNTIL 145 AM CDT...
At 108 AM CDT, a strong thunderstorm was located over Andalusia, or 9
miles southwest of Rock Island, moving northeast at 50 mph.
Winds in excess of 30 mph and brief heavy rain are possible with
this storm.
Locations impacted include...
Davenport, Moline, Rock Island, Bettendorf, East Moline, Durant,
Silvis, Eldridge, Milan, Le Claire, Hampton, Port Byron, Walcott,
Blue Grass, Buffalo, Andalusia, Rapids City, Princeton, Long Grove
and Cordova.
This includes the following highways...
Interstate 74 in Iowa between mile markers 1 and 5.
Interstate 80 in Iowa between mile markers 277 and 306.
Interstate 74 in Illinois between mile markers 1 and 5.
Interstate 280 between mile markers 1 and 18.
Minor flooding of low lying areas, creeks, streams and urban areas
is possible. If you encounter water over a roadway, do not drive
through it.
LAT...LON 4127 9067 4130 9106 4168 9091 4174 9033
4173 9032 4174 9031 4175 9017
TIME...MOT...LOC 0608Z 220DEG 42KT 4142 9074
UttechSpecial weather statement, Jun 10, 1:13 AM CDT, 2 hours 36 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
113 AM CDT Wed Jun 10 2020
IAC031-103-105-139-100645-
Cedar-Johnson-Jones-Muscatine-
113 AM CDT Wed Jun 10 2020
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CEDAR...NORTHEASTERN
JOHNSON...SOUTHEASTERN JONES AND NORTHWESTERN MUSCATINE COUNTIES
UNTIL 145 AM CDT...
At 112 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Oakdale to near Atalissa. Movement
was northeast at 45 mph.
Winds in excess of 30 mph and brief heavy rain are possible with
these storms.
Locations impacted include...
Iowa City, Muscatine, Tipton, West Branch, Mechanicsville, Stanwood,
Coralville, West Liberty, Wilton, University Heights, Lowden,
Bennett, Atalissa, Rochester, Buchanan, Clarence, Newport, Cedar
Valley, Muscatine County Fairgrounds and Johnson County Fairgrounds.
This includes Interstate 80 in Iowa between mile markers 243 and 274.
Minor flooding of low lying areas, creeks, streams and urban areas
is possible. If you encounter water over a roadway, do not drive
through it.
LAT...LON 4186 9142 4186 9137 4193 9136 4195 9134
4195 9090 4173 9090 4143 9109 4165 9161
TIME...MOT...LOC 0612Z 203DEG 39KT 4172 9154 4154 9115
UttechSpecial weather statement, Jun 10, 1:38 AM CDT, 2 hours 11 minutes before
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</html>The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 7:21 PM CDT | Areal Flood Warning | DVN | Benton, Buchanan, Linn | 12 hr |
| Jun 9, 8:19 PM CDT | River Flood Warning | DVN | Benton, Iowa | 7 days |
| Jun 9, 8:19 PM CDT | River Flood Warning | DVN | Johnson, Washington | 62 hr |
| Jun 9, 8:47 PM CDT | River Flood Watch | DVN | Louisa | 21 days |
| Jun 9, 8:47 PM CDT | River Flood Watch | DVN | Louisa | 21 days |
| Jun 9, 8:47 PM CDT | River Flood Warning | DVN | Cedar, Louisa, Muscatine | 21 days |
| Jun 9, 8:47 PM CDT | River Flood Warning | DVN | Johnson, Louisa, Washington | 48 hr |
| Jun 9, 9:01 PM CDT | River Flood Warning | DVN | Buchanan, Linn | 3 days |
| Jun 9, 9:01 PM CDT | River Flood Warning | DVN | Cedar, Jones, Linn | 7 days |
| Jun 9, 9:35 PM CDT | River Flood Warning | DVN | Des Moines, Louisa | 21 days |
| Jun 9, 10:38 PM CDT | Areal Flood Warning | DVN | Buchanan | 12 hr |
| Jun 9, 11:38 PM CDT | Special Weather Statement | DVN | Jefferson, Van Buren | 37 min |
| Jun 10, 12:02 AM CDT | Special Weather Statement | DVN | Keokuk | 28 min |
| Jun 10, 12:15 AM CDT | River Flood Warning | DVN | Lee | 22 hr |
| Jun 10, 12:23 AM CDT | Special Weather Statement | DVN | Keokuk | 22 min |
| Jun 10, 12:45 AM CDT | Special Weather Statement | DVN | Johnson, Washington | 45 min |
| Jun 10, 1:09 AM CDT | Special Weather Statement | DVN | Scott | 36 min |
| Jun 10, 1:13 AM CDT | Special Weather Statement | DVN | Cedar, Johnson, Muscatine | 32 min |
| Jun 10, 9:36 AM CDT | Special Weather Statement | DVN | Linn | 54 min |
| Jun 10, 9:44 AM CDT | Flash Flood Warning | DVN | Linn | 5 hr |
| Jun 10, 10:10 AM CDT | River Flood Warning | DVN | Louisa | 21 days |
| Jun 10, 10:10 AM CDT | River Flood Warning | DVN | Louisa | 21 days |
| Jun 10, 10:16 AM CDT | River Flood Warning | DVN | Des Moines, Henry, Lee | 65 hr |
| Jun 10, 10:31 AM CDT | Areal Flood Warning | DVN | Buchanan | 48 hr |
| Jun 10, 11:12 AM CDT | Special Weather Statement | DVN | Benton, Delaware | 93 min |
| Jun 10, 1:00 PM CDT | Special Weather Statement | DVN | Louisa, Muscatine | 60 min |
| Jun 10, 1:11 PM CDT | Special Weather Statement | DVN | Clinton, Scott | 64 min |
| Jun 10, 2:20 PM CDT | Areal Flood Warning | DVN | Benton, Linn | 24 hr |
| Jun 9, 11:41 PM CDT | Special Weather Statement | DVN | McDonough | 34 min |
| Jun 10, 1:38 AM CDT | Special Weather Statement | DVN | Whiteside | 37 min |
| Jun 10, 2:05 AM CDT | Special Weather Statement | DVN | Whiteside | 25 min |
Nearby
Flash Flood Watches in Iowa, 2020Every flash flood watch in 2020
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.