Alert archive / Illinois / Special Weather Statements in 2020

Special Weather Statement, NWS Quad Cities, IA

August 9, 2020Stephenson County, Illinois

NWS Quad Cities, IA issued this special weather statement at Aug 9, 2020, 5:23 PM CDT for Stephenson County, Illinois. It was in force for 7 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 9, 2020, 5:23 PM CDT (22:23 UTC)
Expired
Aug 9, 2020, 5:30 PM CDT
In force
7 min
Issued by
NWS Quad Cities, IA

County Stephenson County, IL

The radar

The Milwaukee radar (KMKX), 92 km from the middle of the area, began a volume at 22:24 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, 10.4 hours before the alert went out and 128 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 2020-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1113 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 2020-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 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
1113 J/kg
Mixed-layer CIN
-172 J/kg
Mixed-layer LCL
885 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-18 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 Aug 9, 3:53 PM CDT, 1 hour 30 minutes earlier.

Area forecast discussion, Aug 9, 3:53 PM CDT, 1 hour 30 minutes before
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Hazardous weather outlook, Aug 9, 4:52 PM CDT, 31 minutes before
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In the hours before

Special weather statement, Aug 9, 12:49 PM CDT, 4 hours 34 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
1249 PM CDT Sun Aug 9 2020

IAC019-055-091830-
Buchanan-Delaware-
1249 PM CDT Sun Aug 9 2020

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT EASTERN BUCHANAN AND
NORTHWESTERN DELAWARE COUNTIES UNTIL 130 PM CDT...

At 1248 PM CDT, radar indicated strong thunderstorms were located
along a line extending from near Arlington to near Quasqueton.
Movement was northeast at 30 mph.

Winds in excess of 40 mph and pea size hail are possible with these
storms.

Locations impacted include...
Manchester, Edgewood, Winthrop, Quasqueton, Lamont, Greeley, Aurora,
Dundee, Masonville, Winthrop Golf Course, Manchester Airport, Coffins
Grove Park, Twin Bridges Park, Backbone State Park and Jakway Park.

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

LAT...LON 4259 9127 4236 9176 4264 9178 4264 9127
TIME...MOT...LOC 1748Z 225DEG 25KT 4269 9172 4242 9170

Speck
Special weather statement, Aug 9, 1:28 PM CDT, 3 hours 55 minutes before
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Special weather statement, Aug 9, 1:28 PM CDT, 3 hours 55 minutes before
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Special weather statement, Aug 9, 2:27 PM CDT, 2 hours 56 minutes before
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Special weather statement, Aug 9, 5:23 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
Aug 9, 8:06 AM CDTSpecial Weather StatementDVNBuchanan39 min
Aug 9, 8:39 AM CDTSpecial Weather StatementDVNBuchanan66 min
Aug 9, 9:16 AM CDTSpecial Weather StatementDVNDelaware44 min
Aug 9, 9:55 AM CDTSpecial Weather StatementDVNDubuque65 min
Aug 9, 12:49 PM CDTSpecial Weather StatementDVNDelaware41 min
Aug 9, 1:28 PM CDTSpecial Weather StatementDVNDelaware47 min

Nearby

Special Weather Statements in Illinois, 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.