Alert archive / Missouri / Mesoscale Discussions in 2010
Mesoscale Discussion 1821
The Storm Prediction Center issued this mesoscale discussion at Sep 13, 2010, 5:45 PM CDT for 4 states. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Sep 13, 2010, 5:45 PM CDT (22:45 UTC)
- Expired
- Sep 13, 2010, 6:45 PM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 26 counties
Adams County, IA, Fremont County, IA, Montgomery County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Leavenworth County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Worth County, MO, Nemaha County, NE, Otoe County, NE, Richardson County, NE
The radar
The Pleasant Hill radar (KEAX), 153 km from the middle of the area, began a volume at 22:44 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, 10.8 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
- 1168 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 594 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
435
ACUS11 KWNS 132245
SWOMCD
SPC MCD 132245
MOZ000-IAZ000-KSZ000-NEZ000-132345-
MESOSCALE DISCUSSION 1821
NWS STORM PREDICTION CENTER NORMAN OK
0545 PM CDT MON SEP 13 2010
AREAS AFFECTED...NEB...NRN KS...SWRN IA...NWRN MO
CONCERNING...TORNADO WATCH 656...
VALID 132245Z - 132345Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 656 CONTINUES.
IMMEDIATE CONCERNS ARE FOR THE TRANSITIONING HP SUPERCELL SW OF
OMAHA TURNING INTO A HIGH-WIND SITUATION ACROSS SERN NEB...SWRN
IA...NWRN MO AND NERN KS. THE STORM SHOULD CONTINUE SEWD ALONG THE
INSTABILITY GRADIENT AND ALTHOUGH THE SLY LLJ AXIS WILL DEVELOP
ACROSS CNTRL KS/NEB THIS EVENING...WELL-ORGANIZED NATURE TO THE
STORM WILL LIKELY MAINTAIN SOME DEGREE OF SEVERE THREATS INTO NWRN
MO/NERN KS FOR A FEW MORE HOURS. AS A RESULT...A NEW WW WILL BE
NEEDED DOWNSTREAM.
..RACY.. 09/13/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DMX...EAX...OAX...TOP...
LAT...LON 39519538 40619642 40949609 41119453 40679408 40029393
39239425 38939500 39519538SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 2:38 PM CDT | Tornado Watch | SPC | Fremont, Mills, Montgomery, Page, Pottawattamie | 7 hr |
| Sep 13, 6:09 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Clarke, Decatur, Ringgold, Taylor, Union and 1 more | 4 hr |
| Sep 13, 1:38 PM CDT | Mesoscale Discussion | SPC | Brown, Clay, Cloud, Dickinson, Ellsworth, Geary and 18 more | 67 min |
| Sep 13, 5:07 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Comanche, Edwards, Ellis and 15 more | 53 min |
| Sep 13, 6:30 PM CDT | Mesoscale Discussion | SPC | Cloud, Decatur, Jewell, Marshall, Norton, Phillips and 3 more | 60 min |
Nearby
Mesoscale Discussions in Missouri, 2010Mesoscale Discussions in Iowa, 2010Mesoscale Discussions in Kansas, 2010Every mesoscale discussion in 2010
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.