Alert archive / Illinois / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 1, NWS Quad Cities, IA

February 23, 2019Bureau County, Henry County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Feb 23, 2019, 6:36 PM CST for Bureau County, Henry County, Illinois. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 23, 2019, 6:36 PM CST (00:36 UTC)
Expired: Feb 23, 2019, 7:15 PM CST
In force: 39 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Bureau County, IL, Henry County, IL

The radar

The Quad Cities radar (KDVN), 68 km from the middle of the area, began a volume at 00:38 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 00:00Z, 0.6 hours before the alert went out and 62 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: 414 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 514 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Feb 23, 2:21 PM CST, 4 hours 15 minutes earlier.

Area forecast discussion, Feb 23, 2:21 PM CST, 4 hours 15 minutes before

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Hazardous weather outlook, Feb 23, 7:18 AM CST, 11 hours 18 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
718 AM CST Sat Feb 23 2019

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-241100-
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-
718 AM CST Sat Feb 23 2019

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

A Winter Weather Advisory remains in effect for areas along and
north of Highway 30 through 10 AM for freezing rain and some
sleet. Ice accumulations up to around two tenths of an inch are
expected.

A Wind Advisory is in effect for the entire area from late
tonight after Midnight, through Sunday evening.

A Flash Flood Watch has been issued for the entire area today
through this evening.

Rounds of moderate to locally heavy rain will move across the area
today through this evening. By this evening, much of the area may
have received rainfall amounts generally of a half inch, up to
two inches. This kind of rainfall combined with some snow melt
will produce the threat for flash flooding and general flooding.
Otherwise ponding of water on roads and drainage ditches is likely.
Urban and small stream flooding may also occur as the day
progresses.

Isolated to scattered thunderstorms are possible from roughly 2
PM to 8 PM. There is a marginal risk for severe storms this
afternoon across far southeastern Iowa into west central Illinois.
Hail and damaging winds would be the primary threats from any
strong to severe storm that may develop. Any storm will also be
able to produce locally heavy downpours and add to the flash flood
potential.

Saturday night, the rain is expected to change to snow from west
to east before ending. Snowfall amounts of 1 to 3 inches will be
possible by Sunday morning mainly northwest of a Cedar Rapids to
Manchester Iowa line. Areas to the east and south of those areas,
down to Interstate 80 will get less than an inch of snow.

Very strong west to northwest winds will develop late tonight
through Sunday. Sustained winds of 25 to 35 mph are expected with
gusts up to 50 mph. Higher gusts over 55 MPH may occur during a
couple of hours either side of daybreak Sunday morning. The high
winds may cause blowing and drifting snow in the areas that get a
few inches. Also, the strong winds combined with still falling
snow will produce significantly reduced visibility or even near
blizzard conditions in rural areas.

Run-off from all the rain, as well as snow melt may lead to
considerable rises and possible flooding along area rivers.
Breakup ice jams will also be a concern.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Very strong winds of 25 to 30 MPH and gusts to 50 MPH will
continue Sunday through Sunday evening. Higher gusts will be
possible in the morning. A Wind Advisory is in effect through
Sunday evening.

Wind chills may approach 20 below zero by Monday morning along
the Highway 20 corridor.

.SPOTTER INFORMATION STATEMENT...

There is a low chance that spotter activation will be needed this
afternoon. Reports of significant ice accumulations or flooding will
be appreciated today.

12

In the hours before

Special weather statement, Feb 23, 1:55 PM CST, 4 hours 41 minutes before

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Local storm report, Feb 23, 3:14 PM CST, 3 hours 22 minutes before

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Special weather statement, Feb 23, 6:31 PM CST, 5 minutes before

Special Weather Statement
National Weather Service Quad Cities IA/IL
631 PM CST SAT FEB 23 2019

ILC011-073-240100-
Henry-Bureau-
631 PM CST SAT FEB 23 2019

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN HENRY AND WESTERN
BUREAU COUNTIES UNTIL 700 PM CST...

At 631 PM CST, a strong thunderstorm was located over La Fayette, or
7 miles south of Kewanee, moving northeast at 60 mph.

Nickel size hail is possible with this storm.

Minor flooding of area creeks and streams is possible.

Locations impacted include...
Kewanee, Princeton, Walnut, Wyanet, Sheffield, Buda, Neponset,
Manlius, Mineral, Dover, New Bedford, Providence, Kasbeer, Kewanee
Municipal Airport, Normandy, Johnson-Sauk Trail State Park and Bureau
County Fairgrounds.

This includes Interstate 80 in Illinois between mile markers 36 and
57.

Minor flooding is possible. If you are driving and encounter a
flooded roadway, Turn around, don't drown. Most flood deaths occur in
vehicles.

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 4123 8965 4123 8987 4115 8987 4115 9001
      4158 8976 4159 8961 4149 8933
TIME...MOT...LOC 0031Z 206DEG 52KT 4114 8995

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 23, 6:21 PM CST	Dense Fog Advisory	DVN	Cedar, Clinton, Delaware, Des Moines, Dubuque, Henry and 13 more	5 hr
Feb 23, 6:45 PM CST	Special Weather Statement	DVN	Scott	90 min
Feb 23, 7:28 PM CST	River Flood Warning	DVN	Johnson, Louisa, Washington	3 days
Feb 23, 9:46 PM CST	High Wind Warning	DVN	Cedar, Clinton, Des Moines, Dubuque, Jackson, Johnson and 4 more	23 hr
Feb 24, 9:57 AM CST	River Flood Warning	DVN	Cedar, Louisa, Muscatine	45 hr
Feb 24, 3:45 PM CST	River Flood Warning	DVN	Keokuk	31 hr
Feb 23, 6:31 PM CST	Special Weather Statement	DVN	Bureau	29 min
Feb 23, 7:31 PM CST	Special Weather Statement	DVN	Jo Daviess	119 min
Feb 23, 7:34 PM CST	Special Weather Statement	DVN	Bureau	86 min
Feb 23, 9:45 PM CST	River Flood Warning	DVN	Henry	18 hr
Feb 24, 3:13 PM CST	Areal Flood Warning	DVN	Whiteside	4 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2019 Every severe thunderstorm warning in 2019

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.