Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

June 25, 2021Stephenson County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jun 25, 2021, 2:34 PM CDT for Stephenson County, Illinois. It was in force for 41 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 25, 2021, 2:34 PM CDT (19:34 UTC)
Expired: Jun 25, 2021, 3:15 PM CDT
In force: 41 min
Issued by: NWS Quad Cities, IA

County Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 108 km from the middle of the area, began a volume at 19:38 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, 7.6 hours before the alert went out and 103 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: 22 J/kg
Mixed-layer CIN: -140 J/kg
Mixed-layer LCL: 711 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 14 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 25, 12:51 PM CDT, 1 hour 43 minutes earlier.

Area forecast discussion, Jun 25, 12:51 PM CDT, 1 hour 43 minutes before

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Hazardous weather outlook, Jun 25, 3:34 AM CDT, 11 hours before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
334 AM CDT Fri Jun 25 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-260845-
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-
334 AM CDT Fri Jun 25 2021

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

Thunderstorms will be seen today and tonight with the potential
for severe storms. The thunderstorms will also be capable of
heavy rain, thus a flash flood watch is in effect for most areas
south of Interstate 80.

The Storm Prediction Center has a slight risk of severe storms
south of an Ottumwa, Iowa to Galesburg, Illinois line. North of
that line there is a marginal risk of severe storms.

If severe storms occur today and tonight the primary risk is
damaging winds.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

There is a daily risk of thunderstorms across the area. Locally
heavy rainfall is also possible.

The Storm Prediction Center has a marginal risk of severe storms
on Saturday. The risk area is south of a line from Freeport,
Illinois to Ottumwa, Iowa. If severe storms develop the primary
risk is damaging winds.

Beyond Saturday it is too early to determine any severe risk.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

In the hours before

Local storm report, Jun 25, 11:31 AM CDT, 3 hours 3 minutes before

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Local storm report, Jun 25, 11:36 AM CDT, 2 hours 58 minutes before

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Local storm report, Jun 25, 11:42 AM CDT, 2 hours 52 minutes before

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Special weather statement, Jun 25, 2:12 PM CDT, 22 minutes before

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Special weather statement, Jun 25, 2:16 PM CDT, 18 minutes before

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Special weather statement, Jun 25, 2:34 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.

Issued	Product	Office	Counties	Lasted
Jun 24, 7:23 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	40 min
Jun 24, 8:13 PM CDT	Special Weather Statement	DVN	Jefferson	47 min
Jun 24, 8:42 PM CDT	Flash Flood Warning	DVN	Jefferson, Van Buren	6 hr
Jun 24, 11:34 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	41 min
Jun 24, 11:44 PM CDT	Severe Thunderstorm Warning	DVN	Lee	46 min
Jun 25, 2:49 AM CDT	Areal Flood Warning	DVN	Jefferson, Van Buren	17 hr
Jun 25, 4:07 AM CDT	River Flood Warning	DVN	Van Buren	10 hr
Jun 25, 4:07 AM CDT	River Flood Warning	DVN	Lee	62 hr
Jun 25, 5:05 AM CDT	Special Weather Statement	DVN	Cedar	40 min
Jun 25, 8:07 AM CDT	Areal Flood Warning	DVN	Van Buren	26 hr
Jun 25, 2:12 PM CDT	Special Weather Statement	DVN	Dubuque	33 min
Jun 25, 2:48 PM CDT	Special Weather Statement	DVN	Delaware, Dubuque	57 min
Jun 25, 4:26 PM CDT	Special Weather Statement	DVN	Delaware, Dubuque	49 min
Jun 25, 6:18 PM CDT	Special Weather Statement	DVN	Benton, Jackson, Jones, Linn	42 min
Jun 25, 12:36 AM CDT	Special Weather Statement	DVN	Hancock, McDonough	24 min
Jun 25, 1:24 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	51 min
Jun 25, 1:44 AM CDT	Flash Flood Warning	DVN	Bureau, Henry	6 hr
Jun 25, 2:16 PM CDT	Special Weather Statement	DVN	Jo Daviess	29 min
Jun 24, 8:23 PM CDT	River Flood Watch	DVN	Clark	14 hr
Jun 24, 10:57 PM CDT	Special Weather Statement	DVN	Scotland	33 min
Jun 25, 10:09 AM CDT	River Flood Warning	DVN	Clark	56 hr

Nearby

Special Weather Statements in Illinois, 2021 Every special weather statement in 2021

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.