Alert archive / Arizona / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 65, NWS Flagstaff, AZ

September 15, 1999Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 15, 1999, 3:16 PM MST for Yavapai County, Arizona. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 15, 1999, 3:16 PM MST (22:16 UTC)
Expired: Sep 15, 1999, 3:50 PM MST
In force: 34 min
Issued by: NWS Flagstaff, AZ
Area: Whole counties

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 22:20 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 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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 15, 2:50 PM MST, 26 minutes earlier.

Area forecast discussion, Sep 15, 2:50 PM MST, 26 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION...CORRECTION TO SYNOPSIS
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
250 PM MST WED SEP 15 1999

SYNOPSIS...A WEAK TROUGH WILL CONTINUE MOVING ACROSS NORTHERN
ARIZONA THROUGH TONIGHT. THUNDERSTORMS WILL BEGIN DISSIPATING LATER
THIS EVENING IN THE WEST...WHILE CONTINUING PAST MIDNIGHT NEAR THE
WHITE MOUNTAINS. LINGERING MOISTURE WILL ALLOW ISOLATED
THUNDERSTORMS TO DEVELOP WEST OF THE RIM...WITH SCATTERED STORMS
ALONG THE HIGHER TERRAIN OF THE RIM COUNTRY. A DRYING TREND WILL
BEGIN ON FRIDAY...BUT SOME MOISTURE ALONG WITH A CHANCE OF
THUNDERSTORMS WILL LINGER OVER EASTERN ARIZONA THROUGH MONDAY.

DISCUSSION...FORECAST FOCUS REMAINS ON THE EFFECTS OF THE MID LEVEL
SHORTWAVE THROUGH THE AREA. THUNDERSTORMS CONTINUE MOVING ALONG A
LINE IN THE SOUTHERN TO SOUTHEASTERN CWA. STORMS ARE MOVING EAST
WITH A SMALL GROUP COMPONENT TO THE NORTH. NONE OF THE STORMS HAVE
GOTTEN OUT OF HAND YET. THE ACTIVITY SHOULD CONTINUE MOVING EAST
THROUGH TONIGHT...WITH A DIURNAL TENDENCY TOWARD CLEARING. STORMS
WILL CONTINUE UNTIL PRETTY LATE TONIGHT. FOG IS A POSSIBILITY AGAIN
IN SOME OF THOSE AREAS THE REALLY CLEAR OUT.

MOISTURE WILL BE SLOW TO CLEAR OUT WITH THE RIDGE SETTING UP OVER
SOUTHERN NEW MEXICO THURSDAY. SCATTERED THUNDERSTORMS ARE LIKELY TO
DEVELOP OVER THE ERN AND SRN PORTIONS OF THE CWA. WITH MORE OF A
DIURNAL TENDENCY...WILL GO WITH SLIGHT CHANCE POPS THURDAY NIGHT
WHILE EXPECTING STORMS TO END LATE. BY FRIDAY...RH IS HIGH ENOUGH
OVER THE WHITE MTNS AND RIM COUNTRY FOR CHANCE POPS MENTIONED OVER
THE HIGHER TERRAIN.

IN THE EXTENDED...SATURDAY THROUGH MONDAY...MOISTURE APPEARS TO
LINGER IN THE FLG CWA THROUGH SATURDAY...WITH A CHANCE OF PRECIP.
SUNDAY AND MONDAY LOOK TO BE DRIER AS THE RIDGE AXIS PUSHES EAST.
WILL KEEP A CHANCE OF PRECIP IN THE EASTERN ZONES THROUGH DAY 5.

PEREZ

.FLG...NONE.

In the hours before

Special weather statement, Sep 15, 9:30 AM MST, 5 hours 46 minutes before

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Special weather statement, Sep 15, 9:30 AM MST, 5 hours 46 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 Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 14, 5:13 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	47 min
Sep 15, 1:54 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	31 min
Sep 15, 3:04 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	31 min
Sep 15, 3:42 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	33 min
Sep 15, 3:55 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Sep 15, 4:50 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	50 min

Nearby

Severe Thunderstorm Warnings in Arizona, 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; radar from the NEXRAD Level II archive.