Alert archive / Montana / Flash Flood Warnings in 2001

Flash Flood Warning 18, NWS Glasgow, MT

July 18, 2001Dawson County, McCone County, Richland County, Montana

NWS Glasgow, MT issued this flash flood warning at Jul 18, 2001, 4:41 AM MDT for Dawson County, McCone County, Richland County, Montana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 18, 2001, 4:41 AM MDT (10:41 UTC)
Expired
Jul 18, 2001, 7:45 AM MDT
In force
3 hr
Issued by
NWS Glasgow, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Dawson County, MT, McCone County, MT, Richland County, MT

The radar

The Glasgow radar (KGGW), 135 km from the middle of the area, began a volume at 10:41 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 10.7 hours before the alert went out and 134 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, Glasgow Intl Airport, MT at 00:00Z on 2001-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 339 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, Glasgow Intl Airport, MT at 00:00Z on 2001-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.193958Sfc1 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
339 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
2182 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

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

NWS Glasgow, MT wrote its last area forecast discussion before this flash flood warning went out at Jul 18, 2:52 AM MDT, 1 hour 49 minutes earlier.

Area forecast discussion, Jul 18, 2:52 AM MDT, 1 hour 49 minutes before
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In the hours before

Local storm report, Jul 18, 2:53 AM MDT, 1 hour 48 minutes before
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<html lang="en">
<head>
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  <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.
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Special weather statement, Jul 18, 3:00 AM MDT, 1 hour 41 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 Glasgow, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 7:53 PM MDTSevere Thunderstorm WarningGGWGarfield67 min
Jul 17, 8:52 PM MDTSevere Thunderstorm WarningGGWRichland53 min
Jul 17, 8:58 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Prairie62 min
Jul 17, 9:51 PM MDTSevere Thunderstorm WarningGGWRichland54 min
Jul 17, 9:57 PM MDTSevere Thunderstorm WarningGGWDawson, McCone, Prairie63 min
Jul 17, 10:11 PM MDTTornado WarningGGWDawson64 min
Jul 17, 10:24 PM MDTSevere Thunderstorm WarningGGWRoosevelt, Sheridan66 min
Jul 17, 10:40 PM MDTFlash Flood WarningGGWRichland3 hr
Jul 17, 10:47 PM MDTSevere Thunderstorm WarningGGWRichland58 min
Jul 17, 10:52 PM MDTTornado WarningGGWRichland53 min
Jul 17, 10:54 PM MDTFlash Flood WarningGGWDawson3 hr
Jul 17, 10:56 PM MDTSevere Thunderstorm WarningGGWPrairie64 min
Jul 17, 11:09 PM MDTFlash Flood WarningGGWRoosevelt3 hr
Jul 17, 11:15 PM MDTSevere Thunderstorm WarningGGWDawson60 min
Jul 17, 11:23 PM MDTFlash Flood WarningGGWSheridan3 hr
Jul 17, 11:34 PM MDTSevere Thunderstorm WarningGGWRoosevelt, Sheridan56 min
Jul 17, 11:46 PM MDTSevere Thunderstorm WarningGGWRichland59 min
Jul 17, 11:46 PM MDTTornado WarningGGWRoosevelt59 min
Jul 17, 11:51 PM MDTSevere Thunderstorm WarningGGWPrairie54 min
Jul 18, 12:47 AM MDTSevere Thunderstorm WarningGGWPrairie58 min
Jul 18, 1:07 AM MDTFlash Flood WarningGGWPrairie3 hr
Jul 18, 1:46 AM MDTFlash Flood WarningGGWRichland3 hr
Jul 18, 2:01 AM MDTFlash Flood WarningGGWDawson3 hr
Jul 18, 2:15 AM MDTFlash Flood WarningGGWRoosevelt3 hr
Jul 18, 2:28 AM MDTFlash Flood WarningGGWSheridan3 hr

Nearby

Flash Flood Warnings in Montana, 2001Every flash flood warning in 2001

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.