Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 292
The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2012, 3:40 PM CDT for 19 counties in Iowa; 18 counties in Missouri. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Mar 19, 2012, 3:40 PM CDT (20:40 UTC)
- Expired
- Mar 19, 2012, 5:15 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 37 counties
Appanoose County, IA, Boone County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Story County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Adair County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Daviess County, MO, Grundy County, MO, Harrison County, MO, Howard County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Mercer County, MO, Putnam County, MO, Randolph County, MO, Saline County, MO, Schuyler County, MO, Sullivan County, MO
The radar
The Des Moines radar (KDMX), 149 km from the middle of the area, began a volume at 20:40 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 12:00Z, 8.7 hours before the alert went out and 238 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
- 920 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 712 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
128 ACUS11 KWNS 192041 SWOMCD SPC MCD 192040 IAZ000-MOZ000-192215- MESOSCALE DISCUSSION 0292 NWS STORM PREDICTION CENTER NORMAN OK 0340 PM CDT MON MAR 19 2012 AREAS AFFECTED...NORTHERN MO/CENTRAL IA CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 192040Z - 192215Z AT LEAST A FEW SEVERE TSTMS CAPABLE OF HAIL/GUSTY WINDS AND PERHAPS EVEN A BRIEF TORNADO WILL BE POSSIBLE INTO EARLY EVENING ACROSS PORTIONS OF NORTHERN MO/CENTRAL IA. A WATCH DOES NOT APPEAR LIKELY OR IMMINENT AT THIS TIME...BUT CONVECTIVE TRENDS WILL CONTINUE TO BE MONITORED. SCATTERED TSTMS ARE GENERALLY FOCUSED AT MID AFTERNOON ALONG CONVECTIVE OUTFLOW/ZONE OF CONFLUENCE WITHIN A GENERAL NORTH-SOUTH CORRIDOR ACROSS NORTHERN MO/CENTRAL IA...WITH SOME ADDITIONAL STORMS IN THE EASTWARD ADJACENT WARM SECTOR ACROSS NORTH-CENTRAL/NORTHEAST MO AND FAR SOUTH-CENTRAL IA. DESTABILIZATION HAS BEEN TEMPERED IN THE IMMEDIATE VICINITY OF THE OUTFLOW OWING TO PERSIST CLOUD COVER...BUT LITTLE INHIBITION EXISTS IN THE ADJACENT WARM SECTOR WHERE TEMPERATURES HAVE REACHED THE UPPER 70S/LOWER 80S F. IN THE PRESENCE OF STRONG DEEP SOUTHERLY FLOW...SUFFICIENT INSTABILITY/LAPSE RATES EXIST FOR SOME THREAT FOR SEVERE HAIL/WINDS. FURTHERMORE...IT MAY NOT BE OUT OF THE QUESTION FOR STORMS IN THE NEARBY WARM SECTOR TO ACQUIRE SOME ROTATION GIVEN THE STRENGTH/BACKING OF LOW LEVEL FLOW PER REGIONAL WSR-88D VWPS/SURFACE DATA...SUCH THAT A BRIEF TORNADO CANNOT BE RULED OUT. ..GUYER.. 03/19/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LSX...DVN...DMX...EAX... LAT...LON 40269420 42659436 41209212 38979237 39059394 40269420
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 1:34 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 30 more | 116 min |
| Mar 19, 6:43 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 11 more | 62 min |
| Mar 19, 3:55 PM CDT | Mesoscale Discussion | SPC | McDonald | 95 min |
Nearby
Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Missouri, 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.