Mesoscale Discussion 976

Issued

Jun 9, 2017, 7:08 PM CDT (00:08 UTC)

Expired

Jun 9, 2017, 8:15 PM CDT

In force

67 min

Issued by

the Storm Prediction Center

The Fargo/Grand Forks radar (KMVX), 92 km from the middle of the area, began a volume at 00:12 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.

979 
ACUS11 KWNS 100008
SWOMCD
SPC MCD 100008 
MNZ000-NDZ000-100115-

Mesoscale Discussion 0976
NWS Storm Prediction Center Norman OK
0708 PM CDT Fri Jun 09 2017

Areas affected...Portions of ND and northwestern MN

Concerning...Severe Thunderstorm Watch 309...

Valid 100008Z - 100115Z

The severe weather threat for Severe Thunderstorm Watch 309
continues.

SUMMARY...A damaging wind and large hail threat continues across WW
309. A local extension in area of the watch into parts of
northwestern MN may be needed within the next hour.

DISCUSSION...As of 00Z, multiple measured severe wind gusts of
83-104 mph have occurred over the past hour with a supercell
thunderstorm evolving into a small bow across Pierce into Benson
Counties in ND. A separate supercell in Wells County ND has recently
produced multiple large hail reports, some as large as 2 inches in
diameter. Finally, another supercell producing measured severe wind
gusts is moving southeastward along to perhaps just north of a
surface warm front draped across ND into western MN. The environment
downstream of this ongoing activity into eastern ND will remain
favorable for continued severe storm maintenance, with large hail,
damaging winds, and perhaps a tornado or two all possible. If any
supercell can remain discrete, the tornado threat may become
maximized near the warm front with locally backed surface winds
enhancing effective SRH. The warm front should serve as an eastward
limit to the more substantial surface-based supercell threat. Based
of its current position, a small eastward extension in area for the
ongoing Severe Thunderstorm Watch may be warranted for parts of
northwestern MN based on current radar trends.

..Gleason.. 06/10/2017

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...FGF...BIS...

LAT...LON   46620006 49040012 49019623 46589627 46620006

Mesoscale Discussions in North Dakota, 2017Mesoscale Discussions in Minnesota, 2017Every mesoscale discussion in 2017

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.