Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS Quad Cities, IA

October 14, 2017McDonough County, Illinois

NWS Quad Cities, IA issued this special weather statement at Oct 14, 2017, 12:11 PM CDT for McDonough County, Illinois. It was in force for 34 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: Oct 14, 2017, 12:11 PM CDT (17:11 UTC)
Expired: Oct 14, 2017, 12:45 PM CDT
In force: 34 min
Issued by: NWS Quad Cities, IA

County McDonough County, IL

The radar

The Quad Cities radar (KDVN), 116 km from the middle of the area, began a volume at 17:10 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, 5.2 hours before the alert went out and 118 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Oct 14, 6:57 AM CDT, 5 hours 14 minutes earlier.

Area forecast discussion, Oct 14, 6:57 AM CDT, 5 hours 14 minutes before

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Hazardous weather outlook, Oct 14, 5:12 AM CDT, 6 hours 59 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
512 AM CDT Sat Oct 14 2017

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-151000-
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-
512 AM CDT Sat Oct 14 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...TODAY AND TONIGHT

More rounds of showers and thunderstorms will occur today and this
evening. Strong to severe storms are possible later this
afternoon and evening across much of the Outlook area, but areas
currently more favored are generally east and south of a line from
Freeport in northwestern Illinois, to Tipton Iowa, and to
Sigourney in southeastern Iowa. The main threats are damaging
winds up to 70 mph and isolated tornadoes. The Storm Prediction
Center has placed these favored areas in an enhanced risk for
severe weather. The rest of the area is in either a slight risk or
marginal risk for severe weather today and tonight.

Widespread heavy rain is also expected through tonight. localized
amounts of more than 3 inches are possible. With some areas
getting more saturated from recent rounds of heavy rainfall,
additional rounds of thunderstorms and high rainfall rates could
produce flash flooding. Flooding may also occur on small streams
an creeks, along with in bank rises on area rivers. A Flash Flood
Watch has been issued through tonight for areas generally along
and north of a line from Sigourney Iowa, to Princeton Illinois.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Patchy frost is possible early Monday morning, especially along and
north of Interstate 80.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely this afternoon and evening.

12/RP KINNEY

In the hours before

Special weather statement, Oct 14, 7:55 AM CDT, 4 hours 16 minutes before

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Local storm report, Oct 14, 8:17 AM CDT, 3 hours 54 minutes before

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Special weather statement, Oct 14, 9:02 AM CDT, 3 hours 9 minutes before

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Special weather statement, Oct 14, 9:42 AM CDT, 2 hours 29 minutes before

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Special weather statement, Oct 14, 10:45 AM CDT, 1 hour 26 minutes before

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Special weather statement, Oct 14, 12:11 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
1211 PM CDT SAT OCT 14 2017

ILC067-071-109-141745-
Hancock-Henderson-McDonough-
1211 PM CDT SAT OCT 14 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN HANCOCK...
SOUTHEASTERN HENDERSON AND NORTHWESTERN MCDONOUGH COUNTIES UNTIL 1245
PM CDT...

At 1211 PM CDT, a strong thunderstorm was located near La Harpe, or
10 miles northeast of Carthage, moving northeast at 40 mph.

Winds in excess of 30 mph and dime size hail are possible with this
storm.

Locations impacted include...
La Harpe and Blandinsville.

LAT...LON 4054 9110 4071 9090 4066 9079 4064 9079
      4063 9074 4060 9067 4047 9102
TIME...MOT...LOC 1711Z 234DEG 35KT 4053 9101

MCCLURE

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 14, 1:03 AM CDT	Special Weather Statement	DVN	Jefferson, Louisa, Washington	57 min
Oct 14, 1:48 AM CDT	Special Weather Statement	DVN	Louisa, Muscatine, Scott	57 min
Oct 14, 3:30 AM CDT	Flash Flood Watch	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 10 more	19 hr
Oct 14, 9:02 AM CDT	Special Weather Statement	DVN	Washington	28 min
Oct 14, 9:42 AM CDT	Special Weather Statement	DVN	Louisa, Muscatine, Scott	48 min
Oct 14, 1:44 PM CDT	Special Weather Statement	DVN	Henry	31 min
Oct 14, 4:46 PM CDT	Severe Thunderstorm Warning	DVN	Lee, Van Buren	59 min
Oct 14, 5:17 PM CDT	Severe Thunderstorm Warning	DVN	Lee	43 min
Oct 14, 5:31 PM CDT	Tornado Warning	DVN	Lee	44 min
Oct 14, 2:18 AM CDT	Special Weather Statement	DVN	Rock Island	27 min
Oct 14, 3:03 AM CDT	Special Weather Statement	DVN	Whiteside	57 min
Oct 14, 5:55 AM CDT	Special Weather Statement	DVN	Bureau, Putnam	65 min
Oct 14, 6:05 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	40 min
Oct 14, 10:45 AM CDT	Special Weather Statement	DVN	Henry	45 min
Oct 14, 5:07 PM CDT	Special Weather Statement	DVN	Henderson	23 min
Oct 14, 5:26 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Warren	79 min
Oct 14, 5:43 PM CDT	Special Weather Statement	DVN	Bureau, Henry	32 min
Oct 14, 5:51 PM CDT	Severe Thunderstorm Warning	DVN	McDonough	54 min
Oct 14, 6:15 PM CDT	Special Weather Statement	DVN	Bureau, Putnam	30 min
Oct 14, 6:25 PM CDT	Tornado Warning	DVN	Hancock	20 min
Oct 14, 6:53 PM CDT	Areal Flood Warning	DVN	Henry	12 hr

Nearby

Special Weather Statements in Illinois, 2017 Every 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.