Alert archive / Illinois / Areal Flood Advisories in 2021

Areal Flood Advisory 20, NWS Lincoln, IL

July 29, 2021Peoria County, Tazewell County, Woodford County, Illinois

NWS Lincoln, IL issued this areal flood advisory at Jul 29, 2021, 2:47 PM CDT for Peoria County, Tazewell County, Woodford County, Illinois. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 29, 2021, 2:47 PM CDT (19:47 UTC)
Expired: Jul 29, 2021, 5:45 PM CDT
In force: 3 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon

Counties Peoria County, IL, Tazewell County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 62 km from the middle of the area, began a volume at 19:47 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

Lincoln, IL (KILX), launched 12:00Z, 7.8 hours before the alert went out and 97 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: 989 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1257 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Lincoln, IL wrote its last area forecast discussion before this areal flood advisory went out at Jul 29, 12:46 PM CDT, 2 hours 1 minute earlier.

Area forecast discussion, Jul 29, 12:46 PM CDT, 2 hours 1 minute before

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Hazardous weather outlook, Jul 29, 11:40 AM CDT, 3 hours 7 minutes before

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In the hours before

Special weather statement, Jul 29, 9:04 AM CDT, 5 hours 43 minutes before

Special Weather Statement
National Weather Service Lincoln IL
904 AM CDT Thu Jul 29 2021

ILZ028>031-291445-
Marshall-Peoria-Woodford-Stark-
904 AM CDT Thu Jul 29 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MARSHALL...
NORTHWESTERN WOODFORD...STARK...NORTHERN TAZEWELL AND NORTHEASTERN
PEORIA COUNTIES UNTIL 945 AM CDT...

At 903 AM CDT, Doppler radar was tracking a strong thunderstorm near
Wyoming, or 16 miles west of Lacon, moving southeast at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Peoria, Lacon, Chillicothe, Metamora, Germantown Hills, Princeville,
Rome, Wyoming, Dunlap, Toulon, Washburn, Spring Bay, Sparland, Bay
View Gardens, West Jersey, Castleton, Camp Grove, Peoria Heights,
Cazenovia and Hopewell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to 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 4093 8919 4074 8943 4075 8955 4071 8955
      4070 8956 4103 8998 4118 8981
TIME...MOT...LOC 1403Z 308DEG 36KT 4103 8973

NMB

Special weather statement, Jul 29, 9:47 AM CDT, 5 hours before

Special Weather Statement
National Weather Service Lincoln IL
947 AM CDT Thu Jul 29 2021

ILZ027-029-291515-
Peoria-Knox-
947 AM CDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT EASTERN KNOX AND WESTERN PEORIA
COUNTIES UNTIL 1015 AM CDT...

At 945 AM CDT, Doppler radar was tracking a strong thunderstorm near
Williamsfield, or 18 miles east of Galesburg, moving southeast at 40
mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Elmwood, Trivoli, Brimfield, Yates City, Williamsfield, Kickapoo and
Dahinda.

This includes Interstate 74 between mile markers 58 and 82.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to 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 4089 9020 4099 9008 4079 8971 4063 8988
TIME...MOT...LOC 1445Z 305DEG 33KT 4086 9004

NMB

Local storm report, Jul 29, 2:19 PM CDT, 28 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 7:43 AM CDT	Special Weather Statement	ILX	Marshall, Stark, Woodford	62 min
Jul 29, 9:04 AM CDT	Special Weather Statement	ILX	Stark	41 min
Jul 29, 9:47 AM CDT	Special Weather Statement	ILX	Peoria	28 min
Jul 29, 3:17 PM CDT	Special Weather Statement	ILX	Logan	28 min

Nearby

Areal Flood Advisories in Illinois, 2021 Every areal flood advisory in 2021

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.