Alert archive / Arizona / Mesoscale Discussions in 2008

Mesoscale Discussion 2245

September 10, 20086 counties in Arizona

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2008, 4:15 PM MST for 6 counties in Arizona. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Sep 10, 2008, 4:15 PM MST (23:15 UTC)
Expired: Sep 10, 2008, 5:15 PM MST
In force: 60 min
Issued by: the Storm Prediction Center

Counties Gila County, AZ, La Paz County, AZ, Maricopa County, AZ, Mohave County, AZ, Pinal County, AZ, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 162 km from the middle of the area, began a volume at 23:17 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

Phoenix, AZ (KPSR), launched 12:00Z, 11.3 hours before the alert went out and 167 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: 755 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1658 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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>

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 10, 10:57 AM MST	Mesoscale Discussion	SPC	Coconino, La Paz, Maricopa, Navajo, Yavapai	93 min
Sep 10, 11:47 AM MST	Severe Thunderstorm Watch	SPC	La Paz, Maricopa, Mohave, Yavapai, Yuma	7 hr

Nearby

Mesoscale Discussions in Arizona, 2008 Every mesoscale discussion in 2008

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.