Alert archive / Illinois / Flash Flood Warnings in 2019

Flash Flood Warning 5, NWS Chicago, IL

June 5, 2019Ogle County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 5, 2019, 2:40 AM CDT for Ogle County, Illinois. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 5, 2019, 2:40 AM CDT (07:40 UTC)
Expired
Jun 5, 2019, 6:45 AM CDT
In force
4 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

County Ogle County, IL

The radar

The Chicago radar (KLOT), 113 km from the middle of the area, began a volume at 07:42 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, 7.7 hours before the alert went out and 108 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 00:00Z on 2019-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 632 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 00:00Z on 2019-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.1939587897Sfc1 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
632 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
1122 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before this flash flood warning went out at Jun 5, 1:13 AM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jun 5, 1:13 AM CDT, 1 hour 27 minutes before
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Hazardous weather outlook, Jun 4, 3:06 PM CDT, 11 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
306 PM CDT Tue Jun 4 2019

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
052015-
Winnebago-Boone-McHenry-Lake-Ogle-Lee-De Kalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Porter-Newton-Jasper-Benton-
306 PM CDT Tue Jun 4 2019 /406 PM EDT Tue Jun 4 2019/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited hail risk...up to quarter size.
     Limited damaging wind risk...up to 60 mph.
  Limited Flooding Risk.

DISCUSSION...

Isolated to scattered showers and thunderstorms will be possible
this evening. An additional round of thunderstorms may develop
very late tonight and towards daybreak on Wednesday. Some of the
strongest storms could produce marginally severe hail and strong,
gusty winds. Any storms will also be capable of producing locally
heavy rainfall which could lead to isolated instances of minor
flooding tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Limited Severe Thunderstorm Risk, mainly I-80 and south.
Saturday through Monday...
  Limited Thunderstorm Risk.

DISCUSSION:

After a potential round of morning showers and thunderstorms on
Wednesday, additional isolated to scattered thunderstorms will be
possible in the afternoon hours. Whether storms manage to develop
Wednesday afternoon remains uncertain. If storms do form, they
would have the potential to become strong to severe, mainly near
and south of I-80, with a threat for strong wind gusts. Any
storms would be relatively slow moving, resulting in a threat for
localized heavy rainfall.

Thunderstorm chances will return this weekend. Severe weather is
not expected at this time.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed tonight.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east-southeast at 25 to 30 mph.

LMZ740>745-052015-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
306 PM CDT Tue Jun 4 2019

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...Tonight.

Weather hazards expected...

  Hazardous conditions for small craft through this afternoon.
  Elevated Thunderstorm Risk...with an associated:
     Limited hail risk...up to quarter size.
     Limited thunderstorm wind gust risk...up to 40 knots.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Wednesday...
  Limited Thunderstorm Risk.
Saturday through Monday...
  Limited Thunderstorm Risk.

Carlaw

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In the hours before

Special weather statement, Jun 4, 11:46 PM CDT, 2 hours 54 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
1146 PM CDT Tue Jun 4 2019

ILZ003-008-050515-
Winnebago IL-Ogle IL-
1146 PM CDT Tue Jun 4 2019

...SIGNIFICANT WEATHER ADVISORY FOR OGLE AND WINNEBAGO COUNTIES UNTIL
1215 AM CDT...

At 1146 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Pecatonica to Forreston to near Lanark.
Movement was east southeast at 40 mph.

Penny size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Rockford, Loves Park, Machesney Park, Oregon, Mount Morris, Rockford
Airport, Roscoe, Byron, Cherry Valley, Winnebago, Polo, Pecatonica,
Forreston, Durand, Stillman Valley, Davis Junction, Leaf River,
Adeline, Lake Summerset and New Millford.

Including the following interstates...
 I-39 between mile markers 109 and 123.
 I-90 between mile markers 61 and 72.

This includes...  Castle Rock State Park, Lowden State Park, Ogle
County Fairgrounds, Rock Cut State Park, Rock Valley College,
Rockford Aviators Baseball, Rockford Speedway, White Pines State
Park, and Winnebago County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.

&&

LAT...LON 4220 8969 4220 8940 4246 8939 4240 8894
      4208 8894 4190 8962 4193 8963 4193 8969
TIME...MOT...LOC 0446Z 286DEG 33KT 4234 8931 4212 8960 4206 8976

RC
Special weather statement, Jun 4, 11:58 PM CDT, 2 hours 42 minutes before
Special Weather Statement
National Weather Service Chicago/Romeoville
1158 PM CDT Tue Jun 4 2019

ILZ019-050545-
La Salle IL-
1158 PM CDT Tue Jun 4 2019

...SIGNIFICANT WEATHER ADVISORY FOR LA SALLE COUNTY UNTIL 1245 AM
CDT...

At 1157 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Mendota to near McNabb. Movement was east
at 35 mph.

Winds in excess of 45 mph will be possible with these storms.

Locations impacted include...
Ottawa, Streator, Peru, Mendota, Oglesby, La Salle, Utica, Earlville,
North Utica, Wenona, Leland, Tonica, Grand Ridge, Naplate, Lostant,
Cedar Point, Kangley, Troy Grove and Leonore.

Including the following interstates...
 I-39 between mile markers 41 and 77.
 I-80 between mile markers 73 and 92.

This includes...Buffalo Rock State Park, Illinois Valley Community
College, Matthiessen State Park, Starved Rock State Park, and Tri-
County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.

&&

LAT...LON 4163 8917 4163 8880 4111 8879 4111 8893
      4106 8893 4103 8905 4110 8905 4110 8916
TIME...MOT...LOC 0457Z 263DEG 29KT 4156 8919 4118 8926

Kluber
Special weather statement, Jun 5, 12:45 AM CDT, 1 hour 55 minutes before
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Special weather statement, Jun 5, 1:12 AM CDT, 1 hour 28 minutes before
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Special weather statement, Jun 5, 1:39 AM CDT, 1 hour 1 minute before
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Special weather statement, Jun 5, 1:45 AM CDT, 55 minutes before
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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 4, 8:41 PM CDTRiver Flood AdvisoryLOTLaSalle54 hr
Jun 4, 11:18 PM CDTSevere Thunderstorm WarningLOTLee26 min
Jun 4, 11:46 PM CDTSpecial Weather StatementLOTOgle, Winnebago29 min
Jun 4, 11:58 PM CDTSpecial Weather StatementLOTLaSalle47 min
Jun 5, 12:24 AM CDTSevere Thunderstorm WarningLOTLaSalle29 min
Jun 5, 12:45 AM CDTSpecial Weather StatementLOTKendall45 min
Jun 5, 1:00 AM CDTAreal Flood AdvisoryLOTBoone, Cook, DeKalb, DuPage, Kane, Lake and 1 more5 hr
Jun 5, 1:12 AM CDTSpecial Weather StatementLOTWill33 min
Jun 5, 1:39 AM CDTSpecial Weather StatementLOTWill36 min
Jun 5, 1:45 AM CDTSpecial Weather StatementLOTCook30 min
Jun 5, 1:48 AM CDTSpecial Marine WarningLOT87 min
Jun 5, 2:59 AM CDTSpecial Weather StatementLOTOgle31 min
Jun 5, 3:16 AM CDTSpecial Weather StatementLOTDeKalb29 min
Jun 5, 4:18 AM CDTAreal Flood AdvisoryLOTDeKalb, Grundy, Kendall, LaSalle, Lee3 hr
Jun 5, 7:30 AM CDTRiver Flood AdvisoryLOTLaSalle36 hr
Jun 5, 10:26 AM CDTRiver Flood AdvisoryLOTCook39 hr
Jun 5, 2:49 PM CDTMarine Dense Fog AdvisoryLOT38 hr
Jun 5, 1:06 PM CDTSpecial Weather StatementLOTBenton24 min

Nearby

Flash Flood Warnings in Illinois, 2019Every flash flood 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.