Alert archive / Illinois / Mesoscale Discussions in 2014
Mesoscale Discussion 1349
The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2014, 7:09 PM CDT for 19 counties in Illinois; 19 counties in Iowa; 11 counties in Missouri. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jul 12, 2014, 7:09 PM CDT (00:09 UTC)
- Expired
- Jul 12, 2014, 8:45 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 49 counties
Appanoose County, IA, Cedar County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Mahaska County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Adair County, MO, Clark County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO
The radar
The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 00:11 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
Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 97 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
- 2609 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 916 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 13.9
The text
As transmitted, in the capitals the NWS used until 2016.
122
ACUS11 KWNS 130010
SWOMCD
SPC MCD 130009
ILZ000-IAZ000-MOZ000-130145-
MESOSCALE DISCUSSION 1349
NWS STORM PREDICTION CENTER NORMAN OK
0709 PM CDT SAT JUL 12 2014
AREAS AFFECTED...SE IA...FAR N MO...N IL
CONCERNING...TORNADO WATCH 411...
VALID 130009Z - 130145Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 411 CONTINUES.
SUMMARY...DEVELOPING COLD POOL WITH EMBEDDED SUPERCELL STRUCTURES
SHOULD RESULT IN AN INCREASE DAMAGING WIND RISK THROUGH 03Z.
MARGINALLY SEVERE HAIL AND A TORNADO OR TWO WILL REMAIN
POSSIBLE...WITH DOWNSTREAM WW ISSUANCE STILL LIKELY INTO N IL BY
LATE EVENING.
DISCUSSION...SUPERCELL HAS REMAIN PERSISTENT ALONG THE SW IA/NW MO
BORDER AREA...RIGHT-TURNING OVER WORTH INTO HARRISON COUNTY MO.
FARTHER NE...AMALGAMATING CELLS INTO MONROE AND WAPELLO COUNTY IA
HAVE SHOWN INCREASINGLY STRONG OUTBOUND VELOCITIES PER DMX RADAR.
00Z DVN RAOB SAMPLED MLCAPE AROUND 2500 J/KG WITH MEAN MIXING RATIOS
NEAR 18 G/KG. WITH STRONG 0-3 KM SHEAR AIDED BY 700 MB WLYS TO NEAR
40 KT...LEWP/BOWING STRUCTURES SHOULD FORM AS THE COLD POOL
CONTINUES TO DEEPEN. THIS SHOULD RESULT IN AN INCREASING RISK FOR
DAMAGING WINDS TOWARDS/ACROSS THE MS RIVER INTO LATE EVENING.
RELATIVELY WEAK CONVERGENCE HAS LIKELY LIMITED MORE ROBUST DISCRETE
CONVECTION FARTHER E INTO IL IN THE NEAR-TERM. BUT AS THE LLJ
STRENGTHENS THIS EVENING...ADDITIONAL CELLS MAY YET DEVELOP OUT
AHEAD OF THE IA/MO MCS.
..GRAMS.. 07/13/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LOT...ILX...LSX...DVN...DMX...EAX...
LAT...LON 41729192 41899069 41928938 41818882 41588851 41198848
40708883 40319021 40119172 39949437 40249456 40479442
40889366 41189301 41729192SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 9:09 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 23 more | 66 min |
| Jul 12, 9:51 PM CDT | Tornado Watch | SPC | Boone, Cook, DeKalb, DuPage, Ford, Fulton and 21 more | 3 hr |
| Jul 12, 11:44 PM CDT | Mesoscale Discussion | SPC | Grundy, Kendall, LaSalle, Will | 31 min |
| Jul 13, 12:41 PM CDT | Mesoscale Discussion | SPC | Clay, Clinton, Crawford, Edwards, Franklin, Gallatin and 23 more | 94 min |
Nearby
Mesoscale Discussions in Illinois, 2014Mesoscale Discussions in Iowa, 2014Mesoscale Discussions in Missouri, 2014Every mesoscale discussion in 2014
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.