Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Quad Cities, IA

October 14, 2017Louisa County, Muscatine County, Scott County, Iowa; Rock Island County, Illinois

NWS Quad Cities, IA issued this special weather statement at Oct 14, 2017, 1:48 AM CDT for Louisa County, Muscatine County, Scott County, Iowa; Rock Island County, Illinois. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Oct 14, 2017, 1:48 AM CDT (06:48 UTC)
Expired
Oct 14, 2017, 2:45 AM CDT
In force
57 min
Issued by
NWS Quad Cities, IA

Counties Louisa County, IA, Muscatine County, IA, Scott County, IA, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 40 km from the middle of the area, began a volume at 06:49 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, 6.8 hours before the alert went out and 46 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2017-10-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2017-10-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 332 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 13, 11:46 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Oct 13, 11:46 PM CDT, 2 hours 2 minutes before
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Hazardous weather outlook, Oct 13, 4:43 AM CDT, 21 hours 5 minutes before
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In the hours before

Special weather statement, Oct 14, 1:03 AM CDT, 45 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, 0 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

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 14, 1:03 AM CDTSpecial Weather StatementDVNJefferson, Louisa, Washington57 min
Oct 14, 3:30 AM CDTFlash Flood WatchDVNBenton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 10 more19 hr
Oct 14, 9:02 AM CDTSpecial Weather StatementDVNWashington28 min
Oct 14, 9:42 AM CDTSpecial Weather StatementDVNLouisa, Muscatine, Scott48 min
Oct 14, 1:44 PM CDTSpecial Weather StatementDVNHenry31 min
Oct 14, 4:46 PM CDTSevere Thunderstorm WarningDVNLee, Van Buren59 min
Oct 14, 5:17 PM CDTSevere Thunderstorm WarningDVNLee43 min
Oct 14, 5:31 PM CDTTornado WarningDVNLee44 min
Oct 14, 2:18 AM CDTSpecial Weather StatementDVNRock Island27 min
Oct 14, 3:03 AM CDTSpecial Weather StatementDVNWhiteside57 min
Oct 14, 5:55 AM CDTSpecial Weather StatementDVNBureau, Putnam65 min
Oct 14, 6:05 AM CDTSevere Thunderstorm WarningDVNBureau, Putnam40 min
Oct 14, 10:45 AM CDTSpecial Weather StatementDVNHenry45 min
Oct 14, 12:11 PM CDTSpecial Weather StatementDVNMcDonough34 min
Oct 14, 5:07 PM CDTSpecial Weather StatementDVNHenderson23 min
Oct 14, 5:26 PM CDTSevere Thunderstorm WarningDVNHenderson, Warren79 min
Oct 14, 5:43 PM CDTSpecial Weather StatementDVNBureau, Henry32 min
Oct 14, 5:51 PM CDTSevere Thunderstorm WarningDVNMcDonough54 min
Oct 14, 6:15 PM CDTSpecial Weather StatementDVNBureau, Putnam30 min
Oct 14, 6:25 PM CDTTornado WarningDVNHancock20 min
Oct 14, 6:53 PM CDTAreal Flood WarningDVNHenry12 hr

Nearby

Special Weather Statements in Iowa, 2017Special Weather Statements in Illinois, 2017Every special weather statement 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.