Alert archive / Iowa / Flash Flood Watches in 2017

Flash Flood Watch 6, NWS Quad Cities, IA

October 14, 201716 counties in Iowa; 9 counties in Illinois

NWS Quad Cities, IA issued this flash flood watch at Oct 14, 2017, 3:30 AM CDT for 16 counties in Iowa; 9 counties in Illinois. It took effect at Oct 14, 2017, 10:00 AM CDT. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Oct 14, 2017, 3:30 AM CDT (08:30 UTC)
In effect from: Oct 14, 2017, 10:00 AM CDT
Expired: Oct 14, 2017, 10:44 PM CDT
In force: 13 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

All 25 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 32 km from the middle of the area, began a volume at 08:33 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, 8.5 hours before the alert went out and 37 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: 1013 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 332 m²/s²
0-3 km storm-relative helicity: 810 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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 Oct 13, 11:46 PM CDT, 3 hours 44 minutes earlier.

Area forecast discussion, Oct 13, 11:46 PM CDT, 3 hours 44 minutes before

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Hazardous weather outlook, Oct 13, 4:43 AM CDT, 22 hours 47 minutes before

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In the hours before

Special weather statement, Oct 14, 1:03 AM CDT, 2 hours 27 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
103 AM CDT SAT OCT 14 2017

IAC087-101-103-107-115-139-183-140700-
Henry-Louisa-Keokuk-Johnson-Washington-Muscatine-Jefferson-
103 AM CDT SAT OCT 14 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN HENRY...LOUISA...
SOUTHEASTERN KEOKUK...SOUTHEASTERN JOHNSON...WASHINGTON...WESTERN
MUSCATINE AND NORTHEASTERN JEFFERSON COUNTIES UNTIL 200 AM CDT...

At 102 AM CDT, a strong thunderstorm was located over Pleasant Plain,
or 11 miles north of Fairfield, moving northeast at 40 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Muscatine, Fairfield, Washington, Wapello, Columbus Junction, West
Liberty, Lone Tree, Winfield, Riverside, Fruitland, Wayland, Morning
Sun, Brighton, Richland, Ainsworth, Grandview, Conesville, Columbus
City, Letts and Nichols.

Heavy rainfall is also occurring with this storm, and may cause
minor flooding. Do not drive your vehicle through flooded roadways.

LAT...LON 4160 9137 4160 9119 4112 9109 4097 9203
      4128 9214
TIME...MOT...LOC 0602Z 249DEG 35KT 4116 9189

RP KINNEY

Special weather statement, Oct 14, 1:48 AM CDT, 1 hour 42 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
148 AM CDT SAT OCT 14 2017

ILC073-131-161-195-IAC031-045-115-139-163-140745-
Rock
Island-Mercer-Whiteside-Henry-Louisa-Cedar-Scott-Muscatine-Clinton-
148 AM CDT SAT OCT 14 2017

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT AREAS FROM MUSCATINE
THROUGH THE QUAD CITIES AND CLINTON UNTIL 245 AM CDT...

At 145 AM CDT, strong thunderstorms were clustered near Muscatine,
moving northeast at 45 mph.

Heavy rainfall is occurring with these storms, and will cause minor
street flooding, ponding water on highways, and reduced visibility.
Do not drive your vehicle through flooded roadways.

Winds in excess of 30 mph and pea size hail are also possible with
the strongest storms.

Locations impacted include...
Davenport, Moline, Rock Island, Bettendorf, Clinton, Muscatine, East
Moline, Wapello, Columbus Junction, Durant, Silvis, Geneseo,
Eldridge, DeWitt, Milan, Colona, Camanche, Le Claire, Coal Valley and
West Liberty.

LAT...LON 4115 9137 4116 9137 4116 9148 4142 9148
      4142 9137 4165 9136 4193 9015 4193 9012
      4139 8994
TIME...MOT...LOC 0645Z 251DEG 50KT 4142 9118

RP KINNEY

Special weather statement, Oct 14, 2:18 AM CDT, 1 hour 12 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
218 AM CDT SAT OCT 14 2017

ILC073-161-IAC139-163-140745-
Rock Island-Henry-Scott-Muscatine-
218 AM CDT SAT OCT 14 2017

...A STRONG THUNDERSTORM WILL AFFECT ROCK ISLAND...NORTHWESTERN
HENRY...SOUTHERN SCOTT AND EAST CENTRAL MUSCATINE COUNTIES UNTIL 245
AM CDT...

At 218 AM CDT, a strong thunderstorm was located over Andalusia, or
10 miles southwest of Rock Island, moving northeast at 50 mph.

Winds in excess of 30 mph and penny size hail are possible with this
storm.

Locations impacted include...
Davenport, Moline, Rock Island, Bettendorf, East Moline, Silvis,
Eldridge, Colona, Milan, Le Claire, Coal Valley, Hampton, Port Byron,
Blue Grass, Buffalo, Andalusia, Rapids City, Princeton, Cordova and
Riverdale.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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 4140 9021 4133 9072 4133 9092 4148 9100
      4170 9033
TIME...MOT...LOC 0718Z 252DEG 44KT 4142 9076

RP KINNEY

Local storm report, Oct 14, 3:02 AM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
302 AM CDT SAT OCT 14 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0244 AM     HAIL             3 SE DAVENPORT          41.52N 90.57W
10/14/2017  E0.25 INCH       SCOTT              IA   PUBLIC

&&

RP KINNEY

Special weather statement, Oct 14, 3:03 AM CDT, 27 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
303 AM CDT SAT OCT 14 2017

ILC011-073-161-195-140900-
Rock Island-Whiteside-Henry-Bureau-
303 AM CDT SAT OCT 14 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN ROCK ISLAND...
WHITESIDE...NORTHERN HENRY AND NORTHWESTERN BUREAU COUNTIES UNTIL 400
AM CDT...

At 303 AM CDT, a strong thunderstorm was located near Erie, or 15
miles southwest of Morrison, moving northeast at 50 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
East Moline, Sterling, Rock Falls, Morrison, Le Claire, Fulton,
Prophetstown, Hampton, Port Byron, Erie, Walnut, Garden Plain, Rapids
City, Albany, Tampico, Cordova, Lyndon, Hooppole, Cleveland and
Coleta.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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 4146 8937 4149 9039 4158 9039 4159 9034
      4165 9034 4169 9031 4175 9031 4181 9018
      4193 9015 4192 8963 4159 8963 4158 8941
TIME...MOT...LOC 0803Z 252DEG 44KT 4162 9014

RP KINNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 14, 1:03 AM CDT	Special Weather Statement	DVN	Jefferson, Louisa, Washington	57 min
Oct 14, 1:48 AM CDT	Special Weather Statement	DVN	Louisa, Muscatine, Scott	57 min
Oct 14, 9:02 AM CDT	Special Weather Statement	DVN	Washington	28 min
Oct 14, 9:42 AM CDT	Special Weather Statement	DVN	Louisa, Muscatine, Scott	48 min
Oct 14, 1:44 PM CDT	Special Weather Statement	DVN	Henry	31 min
Oct 14, 4:46 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	59 min
Oct 14, 5:17 PM CDT	Severe Thunderstorm Warning	DVN	Lee	43 min
Oct 14, 5:31 PM CDT	Tornado Warning	DVN	Lee	44 min
Oct 14, 2:18 AM CDT	Special Weather Statement	DVN	Rock Island	27 min
Oct 14, 3:03 AM CDT	Special Weather Statement	DVN	Whiteside	57 min
Oct 14, 5:55 AM CDT	Special Weather Statement	DVN	Bureau, Putnam	65 min
Oct 14, 6:05 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	40 min
Oct 14, 10:45 AM CDT	Special Weather Statement	DVN	Henry	45 min
Oct 14, 12:11 PM CDT	Special Weather Statement	DVN	McDonough	34 min
Oct 14, 5:07 PM CDT	Special Weather Statement	DVN	Henderson	23 min
Oct 14, 5:26 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Warren	79 min
Oct 14, 5:43 PM CDT	Special Weather Statement	DVN	Bureau, Henry	32 min
Oct 14, 5:51 PM CDT	Severe Thunderstorm Warning	DVN	McDonough	54 min
Oct 14, 6:15 PM CDT	Special Weather Statement	DVN	Bureau, Putnam	30 min
Oct 14, 6:25 PM CDT	Tornado Warning	DVN	Hancock	20 min
Oct 14, 6:53 PM CDT	Areal Flood Warning	DVN	Henry	12 hr

Nearby

Flash Flood Watches in Iowa, 2017 Flash Flood Watches in Illinois, 2017 Every flash flood watch in 2017

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.