Alert archive / Iowa / Special Weather Statements in 2020

Special Weather Statement, NWS Quad Cities, IA

June 21, 2020Buchanan County, Iowa

NWS Quad Cities, IA issued this special weather statement at Jun 21, 2020, 10:31 PM CDT for Buchanan County, Iowa. It was in force for 44 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, 2020, 10:31 PM CDT (03:31 UTC)
Expired
Jun 21, 2020, 11:15 PM CDT
In force
44 min
Issued by
NWS Quad Cities, IA

County Buchanan County, IA

The radar

The Quad Cities radar (KDVN), 141 km from the middle of the area, began a volume at 03:31 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, 3.5 hours before the alert went out and 146 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 2020-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 751 joules per kilogram.LCLEL10008507005003002001001 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 2020-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
751 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1523 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
104 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, 6:35 PM CDT, 3 hours 56 minutes earlier.

Area forecast discussion, Jun 21, 6:35 PM CDT, 3 hours 56 minutes before
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Hazardous weather outlook, Jun 21, 4:48 AM CDT, 17 hours 43 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
448 AM CDT Sun Jun 21 2020

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-221000-
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-
448 AM CDT Sun Jun 21 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

Isolated to scattered thunderstorms will develop this afternoon
across portions of the Outlook Area. While widespread severe
weather is not expected with this afternoon activity, a stronger
storm cell may be able to produce gusty winds and hail up to dime
size. Frequent cloud to ground lightning and locally heavy
downpours will also occur with afternoon thunderstorms.

Later tonight there will be the chance for a larger area of
thunderstorms moving down into the area from the northwest. Again,
at this time widespread severe weather is not expected. But there
may be a chance for a stronger segment of storms to produce gusty
winds and heavy rainfall that may lead to flooding.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

Thunderstorms are expected on Monday and Monday evening. At this
time severe storms are not anticipated, but stronger storms could
produce gusty winds, small hail, and heavy rain.

Storms will be possible later in the week, but it is too early to
assess any potential for severe weather.

.SPOTTER INFORMATION STATEMENT...

There is a low chance that spotter activation will be needed today
and tonight.

12/Brooks

In the hours before

Special weather statement, Jun 21, 6:09 PM CDT, 4 hours 22 minutes before
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Local storm report, Jun 21, 6:17 PM CDT, 4 hours 14 minutes before
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Local storm report, Jun 21, 6:48 PM CDT, 3 hours 43 minutes before
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Special weather statement, Jun 21, 6:51 PM CDT, 3 hours 40 minutes before
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Local storm report, Jun 21, 8:07 PM CDT, 2 hours 24 minutes before
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Special weather statement, Jun 21, 10:31 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 21, 11:02 PM CDTSpecial Weather StatementDVNBenton, Buchanan, Delaware43 min
Jun 21, 11:28 PM CDTSpecial Weather StatementDVNBenton, Buchanan47 min
Jun 21, 11:58 PM CDTSpecial Weather StatementDVNBenton, Delaware47 min
Jun 22, 12:51 AM CDTSpecial Weather StatementDVNBenton, Delaware, Dubuque, Jones, Linn54 min
Jun 22, 1:40 AM CDTSpecial Weather StatementDVNDubuque, Jackson, Jones65 min
Jun 22, 1:43 AM CDTSpecial Weather StatementDVNBenton, Buchanan62 min
Jun 22, 2:18 AM CDTSpecial Weather StatementDVNIowa57 min
Jun 22, 2:54 AM CDTSpecial Weather StatementDVNBuchanan51 min
Jun 22, 3:12 AM CDTSpecial Weather StatementDVNIowa, Johnson, Keokuk63 min
Jun 22, 3:35 AM CDTFlash Flood WarningDVNBuchanan6 hr
Jun 22, 3:44 AM CDTSpecial Weather StatementDVNWashington46 min
Jun 22, 4:23 AM CDTSpecial Weather StatementDVNHenry, Jefferson, Louisa, Muscatine, Washington52 min
Jun 22, 5:24 AM CDTSpecial Weather StatementDVNCedar, Clinton, Des Moines, Louisa, Muscatine, Scott66 min
Jun 22, 6:12 AM CDTSpecial Weather StatementDVNClinton, Scott63 min
Jun 22, 9:19 AM CDTRiver Flood WarningDVNClinton, Scott12 days
Jun 22, 9:19 AM CDTRiver Flood WarningDVNLinn6 days
Jun 22, 9:19 AM CDTRiver Flood WarningDVNCedar, Johnson, Linn7 days
Jun 22, 9:19 AM CDTRiver Flood WarningDVNCedar, Johnson7 days
Jun 22, 9:19 AM CDTRiver Flood WarningDVNCedar, Louisa, Muscatine21 days
Jun 22, 9:19 AM CDTRiver Flood WarningDVNBenton, Iowa9 days
Jun 22, 9:19 AM CDTRiver Flood WarningDVNJohnson, Washington13 hr
Jun 22, 9:58 AM CDTAreal Flood WarningDVNBenton, Buchanan24 hr
Jun 22, 10:03 AM CDTFlash Flood WatchDVNBenton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 5 more9 hr
Jun 22, 2:36 PM CDTSpecial Weather StatementDVNDes Moines24 min
Jun 22, 2:52 PM CDTRiver Flood WarningDVNCedar, Jones, Linn6 days
Jun 22, 2:56 PM CDTRiver Flood WarningDVNKeokuk41 hr
Jun 22, 2:59 PM CDTSevere Thunderstorm WarningDVNDes Moines, Henry46 min
Jun 22, 3:13 PM CDTRiver Flood WarningDVNBenton, Linn4 days
Jun 22, 3:21 PM CDTRiver Flood WarningDVNLouisa21 days
Jun 22, 3:21 PM CDTRiver Flood WarningDVNLouisa11 days
Jun 22, 4:02 PM CDTSpecial Weather StatementDVNLee58 min
Jun 22, 4:12 PM CDTSevere Thunderstorm WarningDVNLee63 min
Jun 22, 3:44 PM CDTSpecial Weather StatementDVNHenderson, Warren46 min
Jun 22, 4:18 PM CDTSevere Thunderstorm WarningDVNPutnam27 min
Jun 22, 4:49 PM CDTSpecial Weather StatementDVNPutnam26 min
Jun 22, 4:53 PM CDTSpecial Weather StatementDVNMcDonough37 min
Jun 22, 4:56 PM CDTSpecial Weather StatementDVNCarroll34 min
Jun 22, 5:04 PM CDTFlash Flood WarningDVNHancock, McDonough3 hr
Jun 22, 5:16 PM CDTSpecial Weather StatementDVNMcDonough14 min
Jun 22, 2:34 PM CDTSpecial Weather StatementDVNScotland26 min
Jun 22, 3:22 PM CDTSpecial Weather StatementDVNClark, Scotland38 min

Nearby

Special Weather Statements in Iowa, 2020Every special weather statement 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.