Alert archive / Iowa / Special Weather Statements in 2018

Special Weather Statement, NWS Quad Cities, IA

June 21, 2018Muscatine County, Iowa

NWS Quad Cities, IA issued this special weather statement at Jun 21, 2018, 2:49 PM CDT for Muscatine County, Iowa. It was in force for 56 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
Jun 21, 2018, 2:49 PM CDT (19:49 UTC)
Expired
Jun 21, 2018, 3:45 PM CDT
In force
56 min
Issued by
NWS Quad Cities, IA

County Muscatine County, IA

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 19:48 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 12:00Z, 7.8 hours before the alert went out and 57 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 12:00Z on 2018-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 263 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2018-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.193958Sfc1 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
263 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
469 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jun 21, 12:41 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Jun 21, 12:41 PM CDT, 2 hours 8 minutes before
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Hazardous weather outlook, Jun 21, 4:21 AM CDT, 10 hours 28 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
421 AM CDT Thu Jun 21 2018

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-220930-
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-
421 AM CDT Thu Jun 21 2018

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

Expect periods of showers and thunderstorms today and tonight.
Flash flooding and more prolonged flooding are possible,
especially along and east of a line from Manchester to Moline,
where a Flash Flood Watch is in effect. A few strong storms are
possible later this afternoon and evening, with gusty winds the
main threat.

Area rivers are experiencing flooding. Please see the
latest Flood Statements and Flood Warnings for details.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Isolated thunderstorms are possible Friday, with no severe weather
expected.

Flooding is expected to continue on some tributary rivers.
Rounds of heavy rainfall may also cause additional river sites to
rise later this week. Please see the latest Flood Statements and
Flood Warnings for details.

There is a low chance of non-severe thunderstorms late Saturday
into Sunday. More widespread storms are expected late Monday into
Tuesday, with some potential for heavy rain and severe weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today and tonight, mainly for
reports of flash flooding and high water.

RP Kinney

In the hours before

Special weather statement, Jun 21, 12:02 PM CDT, 2 hours 47 minutes before
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Special weather statement, Jun 21, 12:11 PM CDT, 2 hours 38 minutes before
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Local storm report, Jun 21, 12:30 PM CDT, 2 hours 19 minutes before
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Local storm report, Jun 21, 1:10 PM CDT, 1 hour 39 minutes before
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Special weather statement, Jun 21, 1:22 PM CDT, 1 hour 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Quad Cities IA/IL
122 PM CDT THU JUN 21 2018

IAZ040-051>053-063>068-077-078-088-089-ILZ015>017-024>026-035-211915-
Mercer-Warren-Bureau-Henry-Henderson-Rock
Island-McDonough-Clinton-Linn-Henry-Benton-Iowa-Washington-Louisa-
Johnson-Scott-Buchanan-Des Moines-Muscatine-Cedar-Jones-
122 PM CDT THU JUN 21 2018

... Brief Funnel Clouds possible over the next hour ...

At 116 PM CDT...Showers and storms with a history of producing
funnel clouds were located from Cedar Rapids to Aledo, moving
northwest. In addition to funnel clouds, these storms will be
capable of producing locally heavy rainfall of 1 to 2 inches per
hour, causing street flooding and rises in creeks.

Funnel clouds of this nature are short lived and rarely touch the
ground. However, if you notice one approaching the ground, move
indoors to a place of safety.

The National Weather Service will continue to closely monitor the
situation. Please forward reports of funnel cloud sightings to the
nearest law enforcement agency for relay to the National Weather
Service.

LAT...LON 4230 9230 4230 9207 4241 9205 4124 8978
      4123 8987 4115 8987 4115 9044 4050 9045
      4181 9230
TIME...MOT...LOC 1816Z 180DEG 0KT 4149 9106

Speck
Special weather statement, Jun 21, 2:49 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 9:42 PM CDTRiver Flood WatchDVNDubuque, Jackson24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNMuscatine, Scott24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNLouisa, Muscatine24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNLouisa24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNDes Moines, Louisa24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNDes Moines24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNDes Moines, Lee24 hr
Jun 21, 3:47 AM CDTFlash Flood WatchDVNCedar, Clinton, Delaware, Dubuque, Jackson, Johnson and 6 more23 hr
Jun 21, 11:16 AM CDTRiver Flood WarningDVNDubuque, Jackson11 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNMuscatine, Scott15 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNMuscatine15 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNLouisa, Muscatine16 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNLouisa18 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNDes Moines, Louisa19 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNDes Moines21 days
Jun 21, 11:16 AM CDTRiver Flood WarningDVNDes Moines, Lee21 days
Jun 21, 11:16 AM CDTSpecial Weather StatementDVNCedar, Johnson, Louisa, Muscatine3 hr
Jun 21, 11:32 AM CDTRiver Flood WatchDVNClinton, Scott24 hr
Jun 21, 11:40 AM CDTSpecial Weather StatementDVNBenton, Cedar, Des Moines, Johnson, Linn, Louisa and 1 more20 min
Jun 21, 12:02 PM CDTSpecial Weather StatementDVNJohnson118 min
Jun 21, 12:11 PM CDTSpecial Weather StatementDVNBenton, Cedar, Des Moines, Henry, Iowa, Johnson and 7 more49 min
Jun 21, 1:22 PM CDTSpecial Weather StatementDVNBenton, Cedar, Iowa, Johnson, Linn, Louisa and 2 more53 min
Jun 21, 2:05 PM CDTRiver Flood WatchDVNMuscatine24 hr
Jun 21, 2:54 PM CDTSpecial Weather StatementDVNMuscatine66 min
Jun 21, 3:01 PM CDTSpecial Weather StatementDVNJohnson119 min
Jun 20, 8:21 PM CDTRiver Flood WarningDVNHenry, Rock Island13 days
Jun 20, 8:57 PM CDTRiver Flood WatchDVNWhiteside24 hr
Jun 20, 8:57 PM CDTRiver Flood WatchDVNStephenson24 hr
Jun 20, 9:42 PM CDTRiver Flood WatchDVNHancock37 hr
Jun 21, 3:27 PM CDTFlash Flood WarningDVNHenry5 hr
Jun 21, 4:27 PM CDTSpecial Weather StatementDVNMercer33 min
Jun 21, 4:39 PM CDTSpecial Weather StatementDVNBureau, Putnam81 min

Nearby

Special Weather Statements in Iowa, 2018Every special weather statement in 2018

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.