Alert archive / Illinois / Areal Flood Advisories in 2016

Areal Flood Advisory 2, NWS St. Louis, MO

February 20, 2016Bond County, Illinois

NWS St. Louis, MO issued this areal flood advisory at Feb 20, 2016, 11:11 PM CST for Bond County, Illinois. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Feb 20, 2016, 11:11 PM CST (05:11 UTC)
Expired
Feb 21, 2016, 3:15 AM CST
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon

County Bond County, IL

The radar

The St Louis radar (KLSX), 110 km from the middle of the area, began a volume at 05:12 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 00:00Z, 5.2 hours before the alert went out and 158 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, Lincoln, IL at 00:00Z on 2016-02-21Temperature 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, Lincoln, IL at 00:00Z on 2016-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2731 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
163 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 Feb 20, 10:56 PM CST, 15 minutes earlier.

Area forecast discussion, Feb 20, 10:56 PM CST, 15 minutes before
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Hazardous weather outlook, Feb 20, 3:50 PM CST, 7 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
350 PM CST SAT FEB 20 2016

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-211215-
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-ST. CLAIR IL-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-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
350 PM CST SAT FEB 20 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TONIGHT

SCATTERED THUNDERSTORMS ARE POSSIBLE THROUGH TONIGHT...
PARTICULARLY ALONG AND SOUTH OF INTERSTATE 70. SOME OF THE STORMS
WILL BE STRONG TO SEVERE WITH THE MAIN THREAT BEING LARGE HAIL.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

BRITT

In the hours before

Local storm report, Feb 20, 8:41 PM CST, 2 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
841 PM CST SAT FEB 20 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0836 PM     HAIL             1 N MAPAVILLE           38.26N  90.49W
02/20/2016  E0.25 INCH       JEFFERSON          MO   TRAINED SPOTTER

&&

GKS
Local storm report, Feb 20, 8:47 PM CST, 2 hours 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
847 PM CST SAT FEB 20 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0846 PM     HAIL             1 N MAPAVILLE           38.26N  90.49W
02/20/2016  E0.88 INCH       JEFFERSON          MO   TRAINED SPOTTER

            HAIL INCREASED TO NICKEL SIZE

&&

GKS
Local storm report, Feb 20, 9:05 PM CST, 2 hours 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
905 PM CST SAT FEB 20 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 PM     HAIL             CRYSTAL CITY            38.23N  90.38W
02/20/2016  E0.25 INCH       JEFFERSON          MO   TRAINED SPOTTER

&&

GKS
Local storm report, Feb 20, 9:18 PM CST, 1 hour 53 minutes before
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Local storm report, Feb 20, 9:51 PM CST, 1 hour 20 minutes before
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Local storm report, Feb 20, 10:13 PM CST, 58 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 20, 6:18 PM CSTSevere Thunderstorm WarningLSXFranklin, Jefferson, Washington42 min
Feb 20, 6:46 PM CSTSevere Thunderstorm WarningLSXJefferson44 min
Feb 20, 7:18 PM CSTSevere Thunderstorm WarningLSXFranklin42 min
Feb 20, 7:59 PM CSTSevere Thunderstorm WarningLSXFranklin, Jefferson46 min
Feb 20, 9:07 PM CSTAreal Flood AdvisoryLSXFranklin, Jefferson, Washington4 hr
Feb 20, 9:22 PM CSTFlash Flood WarningLSXFranklin, Jefferson4 hr
Feb 20, 7:30 PM CSTSevere Thunderstorm WarningLSXRandolph30 min

Nearby

Areal Flood Advisories in Illinois, 2016Every areal flood advisory in 2016

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.