Alert archive / Illinois / Special Weather Statements in 2021

Special Weather Statement, NWS Quad Cities, IA

August 11, 2021Bureau County, Illinois

NWS Quad Cities, IA issued this special weather statement at Aug 11, 2021, 8:34 PM CDT for Bureau County, Illinois. It was in force for 26 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: Aug 11, 2021, 8:34 PM CDT (01:34 UTC)
Expired: Aug 11, 2021, 9:00 PM CDT
In force: 26 min
Issued by: NWS Quad Cities, IA
Hail: 0.75 in
Wind: 40

County Bureau County, IL

The radar

The Quad Cities radar (KDVN), 102 km from the middle of the area, began a volume at 01:37 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, 1.6 hours before the alert went out and 96 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: 3462 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 233 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 Aug 11, 7:14 PM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, Aug 11, 7:14 PM CDT, 1 hour 20 minutes before

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Hazardous weather outlook, Aug 11, 7:30 PM CDT, 1 hour 4 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
730 PM CDT Wed Aug 11 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-130030-
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-
730 PM CDT Wed Aug 11 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...TONIGHT

Numerous thunderstorms are expected south of Interstate 80 after
midnight. The main threats are gusty winds, frequent lightning and
torrential rainfall. Flash flooding is possible where heavier rain
fell recently.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Severe storms are possible Thursday afternoon and evening ahead of
a cold front, mainly south of a line from Stockton, Illinois to
Belle Plaine, Iowa where the Storm Prediction Center has a
Marginal Risk. There is a slight risk south of Highway 34. The
main severe weather threat will be damaging winds. Heavy rainfall
and frequent lightning will also be possible.

Very warm and humid conditions will linger through Thursday along
and south of Highway 30, where heat index readings near 100 are
possible in the afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected tonight.

Haase

In the hours before

Special weather statement, Aug 11, 3:36 PM CDT, 4 hours 58 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
336 PM CDT Wed Aug 11 2021

IAZ067-077-078-087-088-112100-
Henry IA-Washington IA-Muscatine IA-Louisa IA-Jefferson IA-
336 PM CDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of northern Henry,
western Louisa, southeastern Washington, southwestern Muscatine and
northeastern Jefferson Counties through 400 PM CDT...

At 336 PM CDT, Doppler radar was tracking a strong thunderstorm over
Coppock, or 10 miles south of Washington, moving east at 30 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Wayland around 340 PM CDT.
  Ainsworth, Crawfordsville and Olds around 355 PM CDT.

Other locations in the path of this storm include Winfield, Cotter
and Wyman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4103 9176 4120 9183 4136 9137 4110 9126
TIME...MOT...LOC 2036Z 252DEG 25KT 4114 9170

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

Ervin

Local storm report, Aug 11, 4:19 PM CDT, 4 hours 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
419 PM CDT WED AUG 11 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0419 PM     HAIL             1 SW MANCHESTER         42.47N 91.47W
08/11/2021  E0.25 INCH       DELAWARE           IA   TRAINED SPOTTER

&&

GROSS

Special weather statement, Aug 11, 8:34 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
Aug 12, 2:09 AM CDT	Special Weather Statement	DVN	Lee	21 min
Aug 12, 2:57 AM CDT	Heat Advisory	DVN	Lee	8 hr
Aug 12, 7:24 AM CDT	Special Weather Statement	DVN	Van Buren	36 min
Aug 12, 7:26 AM CDT	Severe Thunderstorm Warning	DVN	Van Buren	33 min
Aug 12, 9:10 AM CDT	Special Weather Statement	DVN	Van Buren	50 min
Aug 12, 9:23 AM CDT	Flash Flood Warning	DVN	Van Buren	4 hr
Aug 12, 9:54 AM CDT	Special Weather Statement	DVN	Lee, Van Buren	96 min
Aug 12, 10:32 AM CDT	Flash Flood Warning	DVN	Lee, Van Buren	6 hr
Aug 12, 11:29 AM CDT	Special Weather Statement	DVN	Lee, Van Buren	91 min
Aug 12, 12:44 PM CDT	Flash Flood Watch	DVN	Des Moines, Lee, Van Buren	8 hr
Aug 12, 2:39 AM CDT	Special Weather Statement	DVN	Henderson	36 min
Aug 12, 2:43 AM CDT	Special Weather Statement	DVN	Putnam	32 min
Aug 12, 2:59 AM CDT	Special Weather Statement	DVN	Henderson, Warren	31 min
Aug 12, 11:10 AM CDT	Special Weather Statement	DVN	Putnam	35 min
Aug 12, 12:55 PM CDT	Special Weather Statement	DVN	Hancock, McDonough	95 min
Aug 12, 1:39 PM CDT	River Flood Watch	DVN	Hancock, McDonough	8 hr
Aug 12, 8:35 AM CDT	Special Weather Statement	DVN	Scotland	25 min
Aug 12, 2:29 PM CDT	Flash Flood Warning	DVN	Scotland	4 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.