Alert archive / Illinois / Special Weather Statements in 2018

Special Weather Statement, NWS Quad Cities, IA

June 20, 2018Stephenson County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jun 20, 2018, 11:52 AM CDT for Stephenson County, Illinois. It was in force for 3 hr. 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 20, 2018, 11:52 AM CDT (16:52 UTC)
Expired: Jun 20, 2018, 2:45 PM CDT
In force: 3 hr
Issued by: NWS Quad Cities, IA

County Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 103 km from the middle of the area, began a volume at 16:56 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, 4.9 hours before the alert went out and 97 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: 235 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 80 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 Jun 20, 10:35 AM CDT, 1 hour 17 minutes earlier.

Area forecast discussion, Jun 20, 10:35 AM CDT, 1 hour 17 minutes before

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Hazardous weather outlook, Jun 20, 4:56 AM CDT, 6 hours 56 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
456 AM CDT Wed Jun 20 2018

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-211000-
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-
456 AM CDT Wed Jun 20 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

More rounds of scattered thunderstorms will occur across the area
this morning, then again by late afternoon and into the evening.
There will be a chance for some strong to severe storms with the
afternoon and evening storms. The primary threat from these storms
will be damaging winds, but there will also be a chance for an
isolated tornado with any strong storm moving along a frontal
boundary that is currently draped across the area along and south
of Interstate 80. The Storm Prediction Center has placed areas
generally along and south of a line from Cedar Rapids Iowa, to
the Quad Cities, and to east of Galesburg Illinois, in a marginal
risk for severe weather today and tonight.

The storms will also have the capability of producing very heavy
rainfall and at high rates. Areas that experience repeated
thunderstorm activity will have the possibility of being impacted
by flash flooding. The heavy rain will also aggravate any ongoing
river and small stream flooding.

A few area rivers are experiencing flooding. Please see the
latest Flood Statements and Flood Warnings for details.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Expect widespread rain and scattered thunderstorms Thursday and
Friday. The severe weather risk is low. However, additional rounds
of heavy rainfall on already saturated ground may lead to flooding
problems, including isolated flash flooding.

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.

Thunderstorms are possible late Saturday into Sunday, and again late
Monday into Tuesday. It is too early to determine the potential for
severe weather.

.SPOTTER INFORMATION STATEMENT...

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

12/RP Kinney

In the hours before

Local storm report, Jun 20, 6:26 AM CDT, 5 hours 26 minutes before

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Special weather statement, Jun 20, 6:36 AM CDT, 5 hours 16 minutes before

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Special weather statement, Jun 20, 7:17 AM CDT, 4 hours 35 minutes before

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Local storm report, Jun 20, 8:00 AM CDT, 3 hours 52 minutes before

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Special weather statement, Jun 20, 11:52 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
1152 AM CDT WED JUN 20 2018

ILC177-201945-
Stephenson-
1152 AM CDT WED JUN 20 2018

...Minor flooding ongoing along and near Yellow Creek...

On Wednesday morning, local emergency management reported ongoing
minor flooding on Yellow Creek and adjacent areas. It is reported
that river levels have not receded after the inital rise Monday
night and Tuesday and many acres of land have yet to drain into the
creek.

Rainfall amounts of 3.50 inches to 7.00 inches fell in the basin
Monday night into Tuesday morning.

Any additional rainfall prior to river levels receding will cause
additional flooding.

If you are driving and encounter a flooded roadway, Turn around,
don't drown. Most flood deaths occur in vehicles.

LAT...LON 4229 8976 4228 8970 4231 8956 4228 8954
      4224 8967 4223 8976 4224 8981 4232 8991
      4238 8987
TIME...MOT...LOC 1647Z 000DEG 0KT 4225 8975

Brooks

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 8:27 PM CDT	Special Weather Statement	DVN	Benton	63 min
Jun 20, 6:36 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Cedar, Iowa, Jefferson, Johnson and 4 more	24 min
Jun 20, 10:09 AM CDT	River Flood Watch	DVN	Iowa, Johnson	34 hr
Jun 20, 2:14 PM CDT	Special Weather Statement	DVN	Henry, Iowa, Jefferson, Keokuk, Lee, Van Buren and 1 more	61 min
Jun 20, 2:29 PM CDT	Tornado Warning	DVN	Keokuk	31 min
Jun 20, 3:10 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Keokuk, Louisa, Washington	65 min
Jun 20, 3:29 PM CDT	Special Weather Statement	DVN	Benton	31 min
Jun 20, 4:33 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones, Linn	42 min
Jun 20, 4:35 PM CDT	Special Weather Statement	DVN	Muscatine	55 min
Jun 20, 4:49 PM CDT	Special Weather Statement	DVN	Clinton, Scott	56 min
Jun 20, 5:25 PM CDT	Tornado Warning	DVN	Scott	29 min
Jun 20, 5:39 PM CDT	Flash Flood Warning	DVN	Scott	3 hr
Jun 20, 6:21 PM CDT	Special Weather Statement	DVN	Jefferson, Van Buren	54 min
Jun 19, 8:51 PM CDT	River Flood Warning	DVN	Henry, Rock Island, Whiteside	14 days
Jun 20, 4:47 PM CDT	Special Weather Statement	DVN	Hancock	58 min

Nearby

Special Weather Statements in Illinois, 2018 Every 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.