Alert archive / Iowa / Mesoscale Discussions in 2012
Mesoscale Discussion 209
The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 11:06 AM CST for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 2, 2012, 11:06 AM CST (17:06 UTC)
- Expired
- Mar 2, 2012, 3:00 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 59 counties
Cedar County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Boone County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Lee County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Clark County, MO, Knox County, MO, Lewis County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Marquette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Quad Cities radar (KDVN), 80 km from the middle of the area, began a volume at 17:06 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, 5.1 hours before the alert went out and 77 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
- 868 m above ground
- 0-6 km bulk shear
- 87 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
451
ACUS11 KWNS 021706
SWOMCD
SPC MCD 021706
ILZ000-WIZ000-IAZ000-MOZ000-022100-
MESOSCALE DISCUSSION 0209
NWS STORM PREDICTION CENTER NORMAN OK
1106 AM CST FRI MAR 02 2012
AREAS AFFECTED...NERN MO...ERN IA...NRN IL...SRN WI
CONCERNING...HEAVY SNOW
VALID 021706Z - 022100Z
MODERATE TO HEAVY SNOW WITH RATES NEAR 1 INCH AN HOUR WILL DEVELOP
LATE THIS MORNING ACROSS ERN IA...PROGRESSING NEWD INTO NRN IL AND
SRN WI THROUGH THE AFTERNOON.
A BAND OF HEAVIER SNOWFALL IS BEGINNING TO BECOME MORE WELL DEFINED
ACROSS ERN IA...INTERSECTING A BROAD MOIST SECTOR TO THE EAST AND
COLDER POST-FRONTAL AIR ADVECTING SEWD FROM THE NORTHWEST. MODERATE
SNOW HAS OCCASIONALLY BEEN REPORTED FROM KANSAS CITY NEWD TO OTTUMWA
IA. DRY LOW LEVELS NOTED ON 12Z AREA SOUNDINGS IS LIKELY HINDERING
HEAVIER RATES ATTM...THOUGH GRADUAL MOISTENING WILL CONTINUE TO
SUPPORT AN AMALGAMATION OF SNOWFLAKES. AS SUCH...RATES MAY BRIEFLY
INCREASE LATER THIS MORNING. CURRENT INDICATIONS ARE THAT THIS BAND
WILL PIVOT EWD...LEADING TO A RATHER TRANSITORY THREAT OF HEAVY
SNOWFALL RATES FOR PORTIONS OF NERN MO AND ERN IA. HOWEVER...LATER
TODAY...THE COMBINATION OF VERY FAVORABLE UPPER LEVEL JET DYNAMICS
AND FRONTOGENETICAL FORCING WILL LIKELY LEAD TO THE
DEVELOPMENT/REDEVELOPMENT OF A MORE PRIMARY BAND OF HEAVY
SNOW...FROM ERN IA...NRN IL AND INTO SRN WI.
..HURLBUT.. 03/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GRB...LOT...ILX...MKX...LSX...DVN...ARX...DMX...
EAX...
LAT...LON 43589060 43958932 43868855 43708831 43008784 42208810
41588963 40549073 39629200 39899261 41069254 42839125
43589060SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 1:46 AM CST | Mesoscale Discussion | SPC | Jackson, Monroe, Perry, Randolph, Saint Clair | 89 min |
| Mar 2, 2:07 AM CST | Severe Thunderstorm Watch | SPC | Calhoun, Jersey, Madison, Monroe, Randolph, Saint Clair | 5 hr |
| Mar 2, 4:25 AM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Christian, Clark, Clay, Clinton and 30 more | 95 min |
| Mar 2, 5:52 AM CST | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 29 more | 6 hr |
| Mar 2, 7:50 AM CST | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Douglas and 12 more | 85 min |
| Mar 2, 9:22 AM CST | Mesoscale Discussion | SPC | Alexander, Crawford, Edwards, Franklin, Gallatin, Hamilton and 13 more | 113 min |
| Mar 2, 9:54 AM CST | Tornado Watch | SPC | Alexander, Bond, Champaign, Christian, Clark, Clay and 41 more | 6 hr |
| Mar 2, 10:02 AM CST | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Crawford, Cumberland, Douglas and 3 more | 88 min |
| Mar 2, 12:05 PM CST | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Saline and 2 more | 85 min |
| Mar 2, 10:28 AM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 62 min |
Nearby
Mesoscale Discussions in Iowa, 2012Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Illinois, 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.