Alert archive / Kansas / Mesoscale Discussions in 2004
Mesoscale Discussion 749
The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 4:28 PM CDT for 12 counties in Kansas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 2004, 4:28 PM CDT (21:28 UTC)
- Expired
- May 18, 2004, 6:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Allen County, KS, Barber County, KS, Butler County, KS, Elk County, KS, Greenwood County, KS, Harvey County, KS, Kingman County, KS, Pratt County, KS, Reno County, KS, Sedgwick County, KS, Wilson County, KS, Woodson County, KS
The radar
The Wichita radar (KICT), 47 km from the middle of the area, began a volume at 21:30 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
Lamont, OK (KLMN), launched 12:00Z, 9.5 hours before the alert went out and 130 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
- 1372 J/kg
- Mixed-layer CIN
- -323 J/kg
- Mixed-layer LCL
- 772 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 379 m²/s²
- 0-3 km storm-relative helicity
- 375 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
280 ACUS11 KWNS 182128 SWOMCD SPC MCD 182128 KSZ000-182330- MESOSCALE DISCUSSION 0749 NWS STORM PREDICTION CENTER NORMAN OK 0428 PM CDT TUE MAY 18 2004 AREAS AFFECTED...SCENTRAL KS CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 182128Z - 182330Z ISOLATED SEVERE THUNDERSTORMS MAY DEVELOP IN THE VICINITY OF ICT IN THE NEXT 1-2 HRS. A WW WOULD LIKELY BE NEEDED IN THE NEXT HOUR IF DEEPER CONVECTION IS NOTED. LATEST VISIBLE IMAGERY SUGGESTS THAT CIN WAS WEAKENING TO THE NW-NE OF ICT WHERE LOW LEVEL CONVERGENCE WAS BEING MAXIMIZED AS OUTFLOW BOUNDARY APPEARED TO BE MERGING WITH THE SYNOPTIC FRONT. ELSEWHERE CIN WAS SUFFICIENTLY STRONG AS EVIDENT BY WAVE CLOUDS. A VERY UNSTABLE AIRMASS WAS IN PLACE WITH MLCAPES FROM 2500 TO 3000 J/KG PER THE 18Z LAMONT OK SOUNDING. LOW-MID LEVEL SHEAR IS SUFFICIENT FOR SUPERCELL DEVELOPMENT IF THUNDERSTORM INITIATION CAN OCCUR. LOW LEVEL SHEAR IS SOMEWHAT MARGINAL FOR TORNADOES / 10-15 KTS 0-1 KM SHEAR IN THE VICINITY OF THE OUTFLOW/FRONTAL BOUNDARY ZONE/ BUT GIVEN MAGNITUDE OF INSTABILITY A TORNADO WATCH WOULD LIKELY BE REQUIRED. ..CROSBIE.. 05/18/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TOP...ICT...DDC... 37459619 37329768 37139868 37279881 37579890 37989829 38099751 38259643 38189530 38099525 37849515 37489551
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 7:59 PM CDT | Mesoscale Discussion | SPC | Barton, Butler, Clark, Clay, Dickinson, Edwards and 40 more | 2 hr |
| May 17, 8:20 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Nemaha | 55 min |
| May 18, 6:22 AM CDT | Mesoscale Discussion | SPC | Coffey, Douglas, Franklin, Jefferson, Johnson, Leavenworth and 4 more | 113 min |
| May 18, 2:22 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Douglas, Ellsworth, Geary, Jackson and 10 more | 113 min |
| May 18, 6:27 PM CDT | Mesoscale Discussion | SPC | Anderson, Atchison, Chase, Coffey, Douglas, Franklin and 11 more | 2 hr |
Nearby
Mesoscale Discussions in Kansas, 2004Every mesoscale discussion in 2004
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.