Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Quad Cities, IA

July 5, 2017Mercer County, Illinois

NWS Quad Cities, IA issued this special weather statement at Jul 5, 2017, 5:43 PM CDT for Mercer County, Illinois. It was in force for 32 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
Jul 5, 2017, 5:43 PM CDT (22:43 UTC)
Expired
Jul 5, 2017, 6:15 PM CDT
In force
32 min
Issued by
NWS Quad Cities, IA

County Mercer County, IL

The radar

The Quad Cities radar (KDVN), 34 km from the middle of the area, began a volume at 22:43 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, 10.7 hours before the alert went out and 38 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 2017-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 552 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 2017-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
552 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1126 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
6 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 Jul 5, 3:09 PM CDT, 2 hours 34 minutes earlier.

Area forecast discussion, Jul 5, 3:09 PM CDT, 2 hours 34 minutes before
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Hazardous weather outlook, Jul 5, 11:41 AM CDT, 6 hours 2 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
1141 AM CDT Wed Jul 5 2017

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-061645-
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-
1141 AM CDT Wed Jul 5 2017

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...THIS AFTERNOON AND TONIGHT

This afternoon into early this evening...Isolated to scattered
thunderstorms can be expected. A few of the stronger storms may
produce wind gusts to 40 MPH and small hail. Thunderstorms will
also be slow moving and produce localized rainfall of an inch or
two in a short time.

Heat index values will push into the lower 90s at many locations
this afternoon, but a few spots may see mid 90s.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Thursday afternoon...heat index values will soar into the mid 90s
at many locations, but upper 90s are possible.

There is a chance of thunderstorms Thursday evening and overnight.
The Storm Prediction Center has a slight risk for severe storms
across much of the outlook area. The main risk will be damaging
winds and large hail.

There is a chance for thunderstorms early next week. However, it
is too early to determine the severe weather risk.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed this afternoon or tonight.

Haase

In the hours before

Special weather statement, Jul 5, 3:27 PM CDT, 2 hours 16 minutes before
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Special weather statement, Jul 5, 4:45 PM CDT, 58 minutes before
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Special weather statement, Jul 5, 5:12 PM CDT, 31 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
512 PM CDT WED JUL 5 2017

IAC163-052245-
Scott-
512 PM CDT WED JUL 5 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN SCOTT COUNTY UNTIL
545 PM CDT...

At 512 PM CDT, a strong thunderstorm was located near Donahue, or 11
miles northeast of Durant, moving south at 10 mph.

Winds in excess of 40 mph and nickel size hail are possible with this
storm.

Locations impacted include...
Dixon, Maysville and Plainview.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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.

LAT...LON 4174 9071 4162 9067 4163 9083 4174 9079
TIME...MOT...LOC 2212Z 001DEG 10KT 4170 9074

MCCLURE
Local storm report, Jul 5, 5:13 PM CDT, 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
513 PM CDT WED JUL 05 2017

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

0508 PM     HAIL             S MACOMB                40.47N 90.68W
07/05/2017  M0.50 INCH       MCDONOUGH          IL   TRAINED SPOTTER

            TORRENTIAL RAIN WITH PEA TO MARBLE SIZED HAIL.

&&

DC
Special weather statement, Jul 5, 5:43 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Quad Cities IA/IL
543 PM CDT WED JUL 5 2017

ILC131-161-052315-
Rock Island-Mercer-
543 PM CDT WED JUL 5 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL ROCK ISLAND AND
NORTH CENTRAL MERCER COUNTIES UNTIL 615 PM CDT...

At 543 PM CDT, a strong thunderstorm was located over Hamlet, or 8
miles north of Aledo, moving southwest at 15 mph.

Winds in excess of 40 mph and nickel size hail are possible with this
storm.

Locations impacted include...
Reynolds, Hamlet, Gingle Corners, Aledo Mercer County Airport and
Marston.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

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.

LAT...LON 4139 9069 4132 9061 4121 9077 4136 9094
TIME...MOT...LOC 2243Z 062DEG 15KT 4132 9072

MCCLURE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 3:27 PM CDTSpecial Weather StatementDVNDubuque63 min
Jul 5, 5:12 PM CDTSpecial Weather StatementDVNScott33 min
Jul 5, 4:45 PM CDTSpecial Weather StatementDVNBureau30 min
Jul 5, 5:56 PM CDTSpecial Weather StatementDVNStephenson34 min

Nearby

Special Weather Statements in Illinois, 2017Every special weather statement in 2017

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.