Alert archive / Michigan / Mesoscale Discussions in 2012

Mesoscale Discussion 1221

June 19, 2012Alcona County, Alpena County, Presque Isle County, Michigan

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2012, 12:33 PM EDT for Alcona County, Alpena County, Presque Isle County, Michigan. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Jun 19, 2012, 12:33 PM EDT (16:33 UTC)
Expired
Jun 19, 2012, 1:30 PM EDT
In force
57 min
Issued by
the Storm Prediction Center

Counties Alcona County, MI, Alpena County, MI, Presque Isle County, MI

The radar

The NCL Michigan radar (KAPX), 80 km from the middle of the area, began a volume at 16:37 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

Alpena, MI (KAPX), launched 12:00Z, 4.6 hours before the alert went out and 106 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-pSkew-T log-p diagram, Alpena, MI at 12:00Z on 2012-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1280 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Alpena, MI at 12:00Z on 2012-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 92 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1280 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1087 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
92 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

085 
ACUS11 KWNS 191634
SWOMCD
SPC MCD 191633
MIZ000-191730-

MESOSCALE DISCUSSION 1221
NWS STORM PREDICTION CENTER NORMAN OK
1133 AM CDT TUE JUN 19 2012

AREAS AFFECTED...NERN LOWER MI

CONCERNING...SEVERE THUNDERSTORM WATCH 411...

VALID 191633Z - 191730Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 411
CONTINUES.

SUMMARY...SEVERE THREAT STEADILY ENDING FROM W TO E ACROSS THE WW
AREA AS THE BOWING STORM CLUSTER SHIFTS TOWARD/INTO LK HURON.

DISCUSSION...LATEST RADAR LOOP SHOWS THE BOWING STORM CLUSTER
SHIFTING QUICKLY EWD ACROSS NERN LOWER MI AND INTO NRN LK HURON
ATTM...WITH JUST A FEW LAKESHORE COUNTIES IN NERN LOWER MI WHERE
LIMITED/ISOLATED DAMAGING WIND THREAT PERSISTS.

AS STORMS CONTINUE SHIFTING OFFSHORE OVER THE NEXT HALF HOUR TO
HOUR...SEVERE THREAT WILL GRADUALLY COME TO AN END ACROSS THIS AREA.

..GOSS.. 06/19/2012

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

ATTN...WFO...APX...

LAT...LON   44688386 44738416 45448381 45818435 45808311 44628308
            44688386

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 6:11 AM EDTMesoscale DiscussionSPCMenominee34 min
Jun 19, 10:00 AM EDTMesoscale DiscussionSPCAlcona, Alpena, Antrim, Benzie, Cheboygan, Crawford and 12 more60 min
Jun 19, 10:11 AM EDTSevere Thunderstorm WatchSPCAlcona, Alpena, Antrim, Benzie, Charlevoix, Cheboygan and 9 more3 hr

Nearby

Mesoscale Discussions in Michigan, 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.