Alert archive / Illinois / Areal Flood Advisories in 2022

Areal Flood Advisory 21, NWS St. Louis, MO

July 2, 2022Monroe County, Randolph County, Saint Clair County, Illinois

NWS St. Louis, MO issued this areal flood advisory at Jul 2, 2022, 10:31 AM CDT for Monroe County, Randolph County, Saint Clair County, Illinois. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 2, 2022, 10:31 AM CDT (15:31 UTC)
Expired
Jul 2, 2022, 1:30 PM CDT
In force
3 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

Counties Monroe County, IL, Randolph County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 78 km from the middle of the area, began a volume at 15:35 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, 3.5 hours before the alert went out and 375 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 2022-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2022-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -45 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1717 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-45 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 St. Louis, MO wrote its last area forecast discussion before this areal flood advisory went out at Jul 2, 6:31 AM CDT, 4 hours earlier.

Area forecast discussion, Jul 2, 6:31 AM CDT, 4 hours before
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Hazardous weather outlook, Jul 2, 4:29 AM CDT, 6 hours 2 minutes before
Hazardous Weather Outlook
National Weather Service Saint Louis MO
429 AM CDT Sat Jul 2 2022

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-030930-
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-
Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Madison IL-Saint Clair-Monroe IL-Knox MO-
Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-
Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-
Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO-
Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO-
Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-
Madison MO-Reynolds MO-
429 AM CDT Sat Jul 2 2022

This Hazardous Weather Outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAY ONE...Today and tonight.

There is a chance of thunderstorms over the area tonight.  Isolated
severe thunderstorms are possible late this morning and this
afternoon over parts of central and southeast Missouri as well as
southwest Illinois. Damaging winds up to 60 mph are the primary
threat.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

The chance for thunderstorms continues Sunday through Friday across
parts of the area.

Dangerous levels of heat will return early next week with widespread
heat indices of 105 degrees or greater possible Tuesday into Thursday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this morning and this afternoon
over parts of central and southeast Missouri as well as southwest
Illinois.

Britt

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 2, 11:26 AM CDTAreal Flood AdvisoryLSXJefferson3 hr
Jul 2, 12:49 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Francois28 min
Jul 2, 3:25 AM CDTAreal Flood AdvisoryLSXClinton, Fayette, Marion3 hr

Nearby

Areal Flood Advisories in Illinois, 2022Every areal flood advisory in 2022

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.