Alert archive / Iowa / Mesoscale Discussions in 2016

Mesoscale Discussion 924

June 14, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Jun 14, 2016, 6:24 PM CDT for 4 states. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jun 14, 2016, 6:24 PM CDT (23:24 UTC)
Expired: Jun 14, 2016, 7:30 PM CDT
In force: 66 min
Issued by: the Storm Prediction Center

All 38 counties

Allamakee County, IA, Buchanan County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Mitchell County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Winneshiek County, IA, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Rock Island County, IL, Whiteside County, IL, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Winona County, MN, Crawford County, WI, Grant County, WI, Iowa County, WI, La Crosse County, WI, Lafayette County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 85 km from the middle of the area, began a volume at 23:24 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, 11.4 hours before the alert went out and 177 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 569 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 989 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

309 
ACUS11 KWNS 142325
SWOMCD
SPC MCD 142324 
WIZ000-ILZ000-IAZ000-MNZ000-150030-

MESOSCALE DISCUSSION 0924
NWS STORM PREDICTION CENTER NORMAN OK
0624 PM CDT TUE JUN 14 2016

AREAS AFFECTED...PORTIONS OF SERN MN...ERN IA...WRN WI...AND NWRN IL

CONCERNING...SEVERE THUNDERSTORM WATCH 256...

VALID 142324Z - 150030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 256
CONTINUES.

SUMMARY...MAINLY A DAMAGING WIND THREAT CONTINUES ACROSS WW 256. AN
ISOLATED TORNADO ALSO REMAINS POSSIBLE.

DISCUSSION...LATEST RADAR IMAGERY AS OF 2320Z DEPICTS A LINE OF
STRONG TO SEVERE THUNDERSTORMS MOVING EWD ACROSS SERN MN AND NERN
IA. DAMAGING WINDS WILL CONTINUE TO BE THE MAIN THREAT WITH THIS
ACTIVITY AS IT MOVES EWD INTO WRN WI. SOME STRONGER CORES HAVE BEEN
NOTED IN CNTRL IA MOVING INTO WRN PORTIONS OF WW 256...AND THESE
THUNDERSTORMS MAY HAVE A LARGE HAIL THREAT IN ADDITION TO SOME
STRONG/GUSTY WINDS. A BROKEN BAND OF CONVECTION ACROSS E-CNTRL IA
INTO NWRN IL IS SITUATED NEAR A SFC WARM FRONT...AND THIS ACTIVITY
MAY POSE THE BEST CHANCE FOR AN ISOLATED TORNADO IN THE SHORT TERM
GIVEN BACKED SELY SFC WINDS...SLIGHTLY MORE FAVORABLE STORM
MODE...AND EFFECTIVE SRH GENERALLY AROUND 100-150 M2/S2. ALL OF THE
AFOREMENTIONED ACTIVITY WILL CONTINUE TO HAVE A SEVERE THREAT UNTIL
IT REACHES/MOVES ACROSS THE WARM FRONT AND BECOMES ELEVATED.
FINALLY...A LOCAL EXTENSION IN AREA SWD TO INCLUDE MORE OF SERN IA
AND W-CNTRL IL MAY BE NEEDED TO ACCOUNT FOR ONGOING STRONG/SEVERE
THUNDERSTORMS NEAR DAVENPORT IA.

..GLEASON.. 06/14/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MKX...DVN...ARX...

LAT...LON   44039279 44329206 44369131 43569029 42888979 42158974
            41308966 41289172 42949203 42959291 44039279

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 14, 3:49 PM CDT	Mesoscale Discussion	SPC	Henry, Jo Daviess, Mercer, Rock Island	56 min
Jun 14, 4:03 PM CDT	Severe Thunderstorm Watch	SPC	Carroll, Jo Daviess, Stephenson	7 hr
Jun 14, 11:45 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Benton, Black Hawk, Boone and 57 more	2 hr
Jun 14, 12:43 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 52 more	8 hr
Jun 14, 2:51 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Benton, Black Hawk, Boone and 59 more	114 min
Jun 14, 6:15 PM CDT	Mesoscale Discussion	SPC	Taylor	3 hr
Jun 14, 2:33 PM CDT	Tornado Watch	SPC	Big Stone, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 32 more	5 hr
Jun 14, 5:16 PM CDT	Mesoscale Discussion	SPC	Big Stone, Blue Earth, Carver, Chippewa, Dakota, Faribault and 20 more	59 min

Nearby

Mesoscale Discussions in Iowa, 2016 Mesoscale Discussions in Wisconsin, 2016 Mesoscale Discussions in Illinois, 2016 Every mesoscale discussion in 2016

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.