Alert archive / Missouri / Flood Watches in 2024

Flood Watch 9, NWS St. Louis, MO

July 16, 202425 counties in Missouri; 15 counties in Illinois

NWS St. Louis, MO issued this flood watch at Jul 16, 2024, 2:17 AM CDT for 25 counties in Missouri; 15 counties in Illinois. It took effect at Jul 16, 2024, 7:43 AM CDT. It was in force for 23 hr.

The area

The counties it named.

The facts

Issued
Jul 16, 2024, 2:17 AM CDT (07:17 UTC)
In effect from
Jul 16, 2024, 7:43 AM CDT
Expired
Jul 17, 2024, 7:00 AM CDT
In force
23 hr
Issued by
NWS St. Louis, MO
Flood severity
None
All 40 counties

Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 6 km from the middle of the area, began a volume at 07:19 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, 7.3 hours before the alert went out and 246 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 2024-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3169 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, Lincoln, IL at 00:00Z on 2024-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 161 square meters per square second.1939Sfc1 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
3169 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1385 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
161 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
1.7
Supercell composite
22.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch 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 flood watch went out at Jul 15, 10:57 PM CDT, 3 hours 20 minutes earlier.

Area forecast discussion, Jul 15, 10:57 PM CDT, 3 hours 20 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Jul 15, 3:00 PM CDT, 11 hours 17 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 6:00 AM CDTSevere Thunderstorm WarningLSXShelby45 min
Jul 16, 6:20 AM CDTAreal Flood AdvisoryLSXMarion, Ralls3 hr
Jul 16, 8:59 AM CDTAreal Flood AdvisoryLSXJefferson, Sainte Genevieve, Saint Francois34 min
Jul 16, 9:14 AM CDTSevere Thunderstorm WarningLSXAudrain, Monroe, Shelby49 min
Jul 16, 9:16 AM CDTRiver Flood WarningLSXJefferson, Saint Louis4 days
Jul 16, 9:33 AM CDTFlash Flood WarningLSXJefferson, Sainte Genevieve, Saint Francois3 hr
Jul 16, 9:47 AM CDTAreal Flood AdvisoryLSXCrawford, Iron, Saint Francois, Washington3 hr
Jul 16, 10:43 AM CDTFlash Flood WarningLSXAudrain, Lincoln, Monroe, Pike, Ralls, Shelby3 hr
Jul 16, 10:51 AM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles54 min
Jul 16, 11:35 AM CDTFlash Flood WarningLSXLincoln, Saint Charles, Warren3 hr
Jul 16, 11:37 AM CDTTornado Warning Tornado observedLSXFranklin, Warren27 min
Jul 16, 11:52 AM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Saint Louis38 min
Jul 16, 12:01 PM CDTFlash Flood WarningLSXFranklin, Jefferson, Saint Charles, Saint Louis, Warren, City of Saint Louis3 hr
Jul 16, 12:01 PM CDTTornado WarningLSXJefferson28 min
Jul 16, 12:31 PM CDTFlash Flood WarningLSXSainte Genevieve, Saint Francois, Washington3 hr
Jul 16, 12:49 PM CDTRiver Flood WarningLSXJefferson2 hr
Jul 16, 2:44 PM CDTRiver Flood WarningLSXJefferson15 hr
Jul 16, 3:24 PM CDTRiver Flood WarningLSXSaint Charles12 hr
Jul 16, 5:42 PM CDTRiver Flood WarningLSXSaint Charles4 days
Jul 16, 4:20 AM CDTAreal Flood AdvisoryLSXPike27 min
Jul 16, 4:28 AM CDTAreal Flood AdvisoryLSXBond, Montgomery3 hr
Jul 16, 4:33 AM CDTAreal Flood AdvisoryLSXFayette25 min
Jul 16, 4:47 AM CDTFlash Flood WarningLSXPike3 hr
Jul 16, 4:51 AM CDTFlash Flood WarningLSXMontgomery3 hr
Jul 16, 4:58 AM CDTFlash Flood WarningLSXFayette3 hr
Jul 16, 5:13 AM CDTAreal Flood AdvisoryLSXFayette, Marion3 hr
Jul 16, 5:19 AM CDTAreal Flood AdvisoryLSXGreene3 hr
Jul 16, 5:30 AM CDTFlash Flood WarningLSXMarion3 hr
Jul 16, 5:58 AM CDTAreal Flood AdvisoryLSXClinton, Washington39 min
Jul 16, 6:37 AM CDTFlash Flood WarningLSXClinton, Washington10 hr
Jul 16, 6:44 AM CDTFlash Flood WarningLSXMarion9 hr
Jul 16, 7:54 AM CDTFlash Flood WarningLSXBond, Clinton, Fayette, Madison, Monroe, Saint Clair4 hr
Jul 16, 9:18 AM CDTAreal Flood WarningLSXMarion6 hr
Jul 16, 2:48 PM CDTRiver Flood WarningLSXMonroe, Saint Clair4 days
Jul 16, 3:39 PM CDTAreal Flood AdvisoryLSXMarion7 hr
Jul 16, 4:43 PM CDTAreal Flood WarningLSXClinton, Washington12 hr

Nearby

Flood Watches in Missouri, 2024Flood Watches in Illinois, 2024Every flood watch in 2024

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.