Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 147, NWS Grand Forks, ND

July 15, 1999Roseau County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 15, 1999, 9:30 AM CDT for Roseau County, Minnesota. It was in force for 35 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 15, 1999, 9:30 AM CDT (14:30 UTC)
Expired: Jul 15, 1999, 10:05 AM CDT
In force: 35 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Roseau County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 178 km from the middle of the area, began a volume at 14:32 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.

What was reported inside it

Time	Report	Where	Remark
Jul 15, 10:00 AM CDT	Thunderstorm Wind	Roseau, MN	Metal siding was blown off an apartment building.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 2.5 hours before the alert went out and 186 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1877 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 15, 3:00 AM CDT, 6 hours 30 minutes earlier.

Area forecast discussion, Jul 15, 3:00 AM CDT, 6 hours 30 minutes before

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In the hours before

Special weather statement, Jul 15, 7:46 AM CDT, 1 hour 44 minutes before

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Special weather statement, Jul 15, 7:46 AM CDT, 1 hour 44 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.
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The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 15, 8:31 AM CDT	Severe Thunderstorm Warning	FGF	Pembina	34 min
Jul 15, 3:50 PM CDT	Severe Thunderstorm Warning	FGF	Richland	35 min
Jul 15, 10:43 AM CDT	Severe Thunderstorm Warning	FGF	Lake of the Woods	32 min
Jul 15, 3:37 PM CDT	Tornado Warning	FGF	Lake of the Woods	33 min
Jul 15, 4:04 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	31 min
Jul 15, 4:35 PM CDT	Severe Thunderstorm Warning	FGF	Becker	30 min
Jul 15, 4:44 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	36 min
Jul 15, 5:01 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard	34 min
Jul 15, 5:16 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail	34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1999 Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.