Alert archive / Missouri / Areal Flood Advisories in 2021

Areal Flood Advisory 14, NWS St. Louis, MO

June 28, 2021Saint Louis County, Missouri

NWS St. Louis, MO issued this areal flood advisory at Jun 28, 2021, 2:05 PM CDT for Saint Louis County, Missouri. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jun 28, 2021, 2:05 PM CDT (19:05 UTC)
Expired: Jun 28, 2021, 5:15 PM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

County Saint Louis County, MO

The radar

The St Louis radar (KLSX), 22 km from the middle of the area, began a volume at 19:05 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, 7.1 hours before the alert went out and 231 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: 386 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 948 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 59 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 St. Louis, MO wrote its last area forecast discussion before this areal flood advisory went out at Jun 28, 12:53 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jun 28, 12:53 PM CDT, 1 hour 12 minutes before

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Hazardous weather outlook, Jun 28, 4:52 AM CDT, 9 hours 13 minutes before

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In the hours before

Local storm report, Jun 28, 8:20 AM CDT, 5 hours 45 minutes before

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Local storm report, Jun 28, 8:40 AM CDT, 5 hours 25 minutes before

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Local storm report, Jun 28, 1:10 PM CDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
110 PM CDT MON JUN 28 2021

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

0405 AM     FLASH FLOOD      4 WNW OLD MONROE        38.95N 90.83W
06/26/2021                   LINCOLN            MO   EMERGENCY MNGR

            WATER RESCUE.

&&

Local storm report, Jun 28, 1:17 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
117 PM CDT MON JUN 28 2021

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

0900 PM     FLASH FLOOD      2 E HANNIBAL            39.71N 91.35W
06/25/2021                   MARION             MO   EMERGENCY MNGR

            BEAR CREEK QUICKLY FILLED UP CAUSING WATER
            TO OVERFLOW ONTO SEVERAL SURFACE STREETS,
            MAKING THEM IMPASSABLE.

&&

Local storm report, Jun 28, 1:29 PM CDT, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
129 PM CDT MON JUN 28 2021

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

0204 PM     TSTM WND DMG     3 NNE HAMBURG           39.27N 90.68W
06/26/2021                   CALHOUN            IL   LAW ENFORCEMENT

            COUNTY DISPATCH REPORTS TREES DOWN ON A
            NUMBER ROADS ACROSS THE NORTHERN PORTION OF
            THE COUNTY.

&&

Local storm report, Jun 28, 1:59 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
159 PM CDT MON JUN 28 2021

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

0128 PM     TORNADO          BARROW                  39.51N 90.40W
06/26/2021                   GREENE             IL   LAW ENFORCEMENT

            SHERIFFS DEPUTY REPORTED A TORNADO IN A
            FIELD TO THE NORTHWEST OF ROODHOUSE, IL
            MOVING TOWARD MANCHESTER, IL. NO DAMAGE WAS
            REPORTED.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 3:42 AM CDT	Areal Flood Advisory	LSX	Callaway, Cole, Osage	3 hr
Jun 28, 3:54 AM CDT	Flash Flood Watch	LSX	Audrain, Boone, Callaway, Cole, Knox, Lewis and 6 more	39 hr
Jun 28, 4:37 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	53 min
Jun 28, 6:11 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Montgomery, Warren	49 min
Jun 28, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	38 min

Nearby

Areal Flood Advisories in Missouri, 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.