Alert archive / Kansas / Mesoscale Discussions in 2003
Mesoscale Discussion 485
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2003, 2:52 PM CDT for 21 counties in Kansas; Pawnee County, Nebraska. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2003, 2:52 PM CDT (19:52 UTC)
- Expired
- Apr 18, 2003, 4:45 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 22 counties
Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Coffey County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Lyon County, KS, Marshall County, KS, Nemaha County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Pawnee County, NE
The radar
The Topeka radar (KTWX), 47 km from the middle of the area, began a volume at 19:53 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Topeka, KS (KTOP), launched 12:00Z, 7.9 hours before the alert went out and 96 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 839 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 318 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Apr 18, 6:14 AM CDT | Mesoscale Discussion | SPC | Clay, Cloud, Dickinson, Ellsworth, Geary, Harvey and 13 more | 2 hr |
| Apr 18, 3:50 PM CDT | Tornado Watch | SPC | Anderson, Atchison, Brown, Chase, Clay, Cloud and 27 more | 6 hr |
| Apr 18, 5:15 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Jackson, Jefferson, Nemaha and 1 more | 90 min |
| Apr 18, 6:20 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Boone, Burt, Cedar, Colfax, Cuming and 13 more | 6 hr |
Nearby
Mesoscale Discussions in Kansas, 2003Mesoscale Discussions in Nebraska, 2003Every mesoscale discussion in 2003
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.