Alert archive / Missouri / Mesoscale Discussions in 2011
Mesoscale Discussion 67
The Storm Prediction Center issued this mesoscale discussion at Feb 1, 2011, 10:36 AM CST for 30 counties in Illinois; 25 counties in Iowa; 62 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 1, 2011, 10:36 AM CST (16:36 UTC)
- Expired
- Feb 1, 2011, 4:30 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 117 counties
Appanoose County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Knox County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Adair County, MO, Audrain County, MO, Bates County, MO, Benton County, MO, Boone County, MO, Caldwell County, MO, Callaway County, MO, Camden County, MO, Carroll County, MO, Cass County, MO, Cedar County, MO, Chariton County, MO, Clark County, MO, Clay County, MO, Clinton County, MO, Cole County, MO, Cooper County, MO, Dallas County, MO, Daviess County, MO, DeKalb County, MO, Gasconade County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Henry County, MO, Hickory County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Knox County, MO, Laclede County, MO, Lafayette County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Maries County, MO, Marion County, MO, Mercer County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Pettis County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saint Charles County, MO, Saline County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, St. Clair County, MO, Sullivan County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 140 km from the middle of the area, began a volume at 16:39 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
Davenport, (KDVN), launched 12:00Z, 4.6 hours before the alert went out and 210 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 667 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 293 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
896
ACUS11 KWNS 011636
SWOMCD
SPC MCD 011636
ILZ000-MOZ000-IAZ000-KSZ000-012230-
MESOSCALE DISCUSSION 0067
NWS STORM PREDICTION CENTER NORMAN OK
1036 AM CST TUE FEB 01 2011
AREAS AFFECTED...NRN MO...SRN IA...WRN IL
CONCERNING...BLIZZARD
VALID 011636Z - 012230Z
SNOWFALL WILL EXPAND N/EWD AHEAD OF AN INTENSE MID-LEVEL IMPULSE
PIVOTING TOWARDS THE MID-MS RIVER VALLEY. SNOWFALL RATES WILL
INCREASE TO 2-3 IN/HR ACROSS NRN MO...AND INTO WRN IL AFTER 20Z.
STRENGTHENING N-NWLY BOUNDARY LAYER WINDS MAY PRODUCE NEAR BLIZZARD
CONDITIONS.
CURRENT RADAR TRENDS AND SHORT-TERM FORECAST MODEL OUTPUT INDICATE A
NEWD SHIFT OF HEAVIEST SNOWFALL BANDS INTO NRN MO AND WRN IL. THIS
WILL OCCUR COINCIDENT WITH INCREASING DEEP-LAYER ASCENT ASSOCIATED
WITH UPPER-LEVEL DIFFLUENCE AND DCVA AHEAD OF MIDLEVEL IMPULSE
CURRENTLY OVER CNTRL OK. SIGNIFICANT ISENTROPIC UPGLIDE ASSOCIATED
WITH WARM CONVEYOR BELT WRAPPING AROUND APPROACHING CYCLONE /WITH
40-50 KTS OF FLOW IN 285-295 K LAYER/ WILL ACT TO ENHANCE DEEP-LAYER
ASCENT. FOCUSED MESOSCALE BANDING /WITH SOME CONVECTIVE ENHANCEMENT
FROM SIGNIFICANT AMOUNT OF SLANTWISE INSTABILITY/ WILL BE SUPPORTED
BY LOW-MIDLEVEL FRONTOGENETIC MAXIMUM SHIFTING INTO NRN MO.
WIDESPREAD SNOWFALL RATES ARE EXPECTED TO RANGE BETWEEN 2-3 IN/HR
ACROSS MUCH OF NRN MO...SPREADING INTO WRN IL AFTER 20Z. LOCALLY
HIGHER SNOWFALL RATES WILL BE POSSIBLE WITHIN THE MOST INTENSE
MESOSCALE BANDS. ACROSS SRN IA...SNOWFALL RATES SHOULD GENERALLY
RANGE BETWEEN 1-2 IN/HR.
..ROGERS.. 02/01/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...LSX...DVN...SGF...DMX...EAX...
LAT...LON 39248998 38399113 37259317 38109478 40459441 41679315
42049073 41468958 40718875 39748922 39248998SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 1, 6:54 AM CST | Mesoscale Discussion | SPC | Bond, Clinton, Fayette, Jersey, Madison, Marion and 5 more | 5 hr |
| Feb 1, 11:42 AM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 27 more | 5 hr |
| Feb 1, 3:36 PM CST | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Calhoun, Carroll and 49 more | 6 hr |
| Jan 31, 10:36 PM CST | Mesoscale Discussion | SPC | Barry, Barton, Camden, Cedar, Christian, Cole and 20 more | 5 hr |
| Feb 1, 3:11 AM CST | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Camden, Cass and 22 more | 6 hr |
| Feb 1, 1:11 PM CST | Mesoscale Discussion | SPC | Barry, Barton, Dade, Jasper, Lawrence, McDonald and 1 more | 4 hr |
Nearby
Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Iowa, 2011Every mesoscale discussion in 2011
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.