Alert archive / Kansas / Mesoscale Discussions in 2012
Mesoscale Discussion 842
The Storm Prediction Center issued this mesoscale discussion at May 19, 2012, 7:03 PM CDT for Harper County, Sumner County, Kansas; Alfalfa County, Grant County, Oklahoma. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2012, 7:03 PM CDT (00:03 UTC)
- Expired
- May 19, 2012, 8:00 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
Counties Harper County, KS, Sumner County, KS, Alfalfa County, OK, Grant County, OK
The radar
The Vance AFB radar (KVNX), 40 km from the middle of the area, began a volume at 00:04 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
Lamont, OK (KLMN), launched 00:00Z, 0.1 hours before the alert went out and 68 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
- 1730 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 1706 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
674
ACUS11 KWNS 200003
SWOMCD
SPC MCD 200003
KSZ000-OKZ000-200100-
MESOSCALE DISCUSSION 0842
NWS STORM PREDICTION CENTER NORMAN OK
0703 PM CDT SAT MAY 19 2012
AREAS AFFECTED...S-CNTRL KS...N-CNTRL OK
CONCERNING...SEVERE THUNDERSTORM WATCH 281...282...
VALID 200003Z - 200100Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
281...282...CONTINUES.
SUMMARY...TORNADO THREAT WILL LIKELY WANE IN THE NEXT HOUR WITH
TSTMS DEVELOPING SWWD ALONG THE COLD FRONT ALONG THE KS/OK BORDER.
DISCUSSION...NUMEROUS TORNADO REPORTS HAVE OCCURRED IN THE PAST HOUR
WITH A TSTM CLUSTER JUST AHEAD OF AND ALONG A COLD FRONT ANALYZED
FROM AROUND 20 W CNK TO 20 SE P28. THIS THREAT HAS BEEN MAXIMIZED
ALONG THE N/S TO NE/SW INFLECTION POINT OF THE FRONT WITH THE
ORIENTATION OF THE CLUSTER...INTERCEPTING THE LOW-LEVEL MOIST AXIS
CHARACTERIZED BY LOWER 60S SURFACE DEW POINTS. THIS THREAT WILL WANE
AS LOW-LEVEL FLOW HAS COMMENCED WEAKENING PER TIME-SERIES OF ICT VWP
DATA. THIS WEAKENING SHOULD PERSIST WITH FLOW BECOMING INCREASINGLY
DIVERGENT AS WELL WITH NEB SHORT WAVE IMPULSE PROGRESSING AWAY FROM
THE REGION.
..GRAMS.. 05/20/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ICT...OUN...DDC...
LAT...LON 37199837 37569790 37709762 37649742 37359733 36979750
36719777 36589807 36589835 36709854 36789858 37199837SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 9:03 PM CDT | Severe Thunderstorm Watch | SPC | Butler, Chautauqua, Cowley, Elk, Greenwood, Montgomery and 3 more | 7 hr |
| May 19, 11:09 PM CDT | Mesoscale Discussion | SPC | Chautauqua, Cowley, Elk, Labette, Montgomery, Wilson | 66 min |
| May 20, 1:30 AM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Creek, Garvin and 14 more | 90 min |
| May 20, 3:00 AM CDT | Mesoscale Discussion | SPC | Caddo, Cleveland, Grady, Kiowa, McClain, Okfuskee and 2 more | 90 min |
Nearby
Mesoscale Discussions in Kansas, 2012Mesoscale Discussions in Oklahoma, 2012Every mesoscale discussion in 2012
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.