Alert archive / Missouri / Mesoscale Discussions in 2005
Mesoscale Discussion 643
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2005, 9:50 PM CDT for Adams County, Iowa; 14 counties in Missouri. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2005, 9:50 PM CDT (02:50 UTC)
- Expired
- Apr 21, 2005, 10:45 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
Counties Adams County, IA, Caldwell County, MO, Carroll County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Pettis County, MO, Ray County, MO, Worth County, MO
The radar
The Pleasant Hill radar (KEAX), 33 km from the middle of the area, began a volume at 02:50 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
Topeka, KS (KTOP), launched 00:00Z, 2.8 hours before the alert went out and 138 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
- 795 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 1802 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 220251 SWOMCD SPC MCD 220250 MOZ000-IAZ000-220345- MESOSCALE DISCUSSION 0643 NWS STORM PREDICTION CENTER NORMAN OK 0950 PM CDT THU APR 21 2005 AREAS AFFECTED...NWRN/WCNTRL MO CONCERNING...TORNADO WATCH 178... VALID 220250Z - 220345Z VALID PORTIONS OF TORNADO WATCH 178 ACROSS PORTIONS OF WCNTRL/NWRN MO IS SET TO EXPIRE AT 04Z AND WILL NOT BE REISSUED. PRIMARY LINEAR BAND OF STRONG-SEVERE TSTMS APPEARS TO BE EVOLVING FROM NCNTRL TO SWRN MO LATE THIS EVENING...OR JUST EAST OF THE VALID PORTIONS OF WT 178. OTHER TSTMS HAVE BEEN STRUGGLING TO DEVELOP ALONG THE DRYLINE/COLD FRONT ACROSS NWRN MO...BUT EARLIER TSTMS HAVE PROBABLY EXHAUSTED SUBSTANTIAL INSTABILITY. MOREOVER...THE LLJ IS AIMED MORE INTO THE TSTMS DEVELOPING FARTHER EAST. ..RACY.. 04/22/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DMX...EAX... 38409439 41219474 38869301 38399370
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 7:47 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Camden, Cedar, Christian, Dade and 22 more | 88 min |
| Apr 21, 8:03 PM CDT | Mesoscale Discussion | SPC | Audrain, Boone, Callaway, Franklin, Gasconade, Howard and 12 more | 87 min |
| Apr 21, 8:19 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Madison and 7 more | 86 min |
| Apr 21, 10:25 PM CDT | Mesoscale Discussion | SPC | Audrain, Bollinger, Butler, Callaway, Camden, Carter and 38 more | 65 min |
| Apr 21, 11:50 PM CDT | Severe Thunderstorm Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 20 more | 6 hr |
| Apr 22, 3:09 AM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Dunklin, Mississippi, New Madrid and 5 more | 66 min |
Nearby
Mesoscale Discussions in Missouri, 2005Mesoscale Discussions in Iowa, 2005Every mesoscale discussion in 2005
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.