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ACUS11 KWNS 221822
SWOMCD
SPC MCD 221821
UTZ000-WYZ000-IDZ000-222015-

Mesoscale Discussion 1341
NWS Storm Prediction Center Norman OK
0121 PM CDT Wed Aug 22 2018

Areas affected...Southeastern Idaho...far southwestern
Wyoming...north-central and portions of central Utah

Concerning...Severe potential...Watch likely

Valid 221821Z - 222015Z

Probability of Watch Issuance...80 percent

SUMMARY...Storm development is evident on visible satellite imagery.
Further development is likely as the afternoon progresses. Large
hail and damaging wind gusts are possible. A WW may be needed within
the next hour.

DISCUSSION...Convective initiation has occurred along the higher
terrain southeast of the Great Salt Lake. Further attempts at
initiation are also evident along the mountains of central Utah per
visible satellite imagery. With the mid-level speed max approaching
the area, effective bulk shear values of 25-55 kts are likely with
the higher values occurring in the northern portion of the
discussion area. Relatively cold temperatures aloft, along with
sufficient shear for supercells, will lead to a threat for large
hail. Damaging wind gusts will also be possible. A WW may be needed
within the next hour.

..Wendt/Guyer.. 08/22/2018

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

ATTN...WFO...RIW...SLC...PIH...

LAT...LON 42501276 42631228 42721166 42411110 41721085 41121087
39751153 39301175 38821198 38801231 39031251 39671256
40321265 40921271 41621282 42501276



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This is a multi-part message in MIME format...

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ACUS11 KWNS 221826
SWOMCD
SPC MCD 221825 COR
UTZ000-WYZ000-IDZ000-222015-

Mesoscale Discussion 1341
NWS Storm Prediction Center Norman OK
0125 PM CDT Wed Aug 22 2018

Areas affected...Southeastern Idaho...far southwestern
Wyoming...north-central and portions of central Utah

Concerning...Severe potential...Watch likely

Valid 221825Z - 222015Z

CORRECTED FOR DIRECTION REFERENCE

Probability of Watch Issuance...80 percent

SUMMARY...Storm development is evident on visible satellite imagery.
Further development is likely as the afternoon progresses. Large
hail and damaging wind gusts are possible. A WW may be needed within
the next hour.

DISCUSSION...Convective initiation has occurred along the higher
terrain west of the Great Salt Lake. Further attempts at initiation
are also evident along the mountains of central Utah per visible
satellite imagery. With the mid-level speed max approaching the
area, effective bulk shear values of 25-55 kts are likely with the
higher values occurring in the northern portion of the discussion
area. Relatively cold temperatures aloft, along with sufficient
shear for supercells, will lead to a threat for large hail. Damaging
wind gusts will also be possible. A WW may be needed within the next
hour.

..Wendt/Guyer.. 08/22/2018

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

ATTN...WFO...RIW...SLC...PIH...

LAT...LON 42501276 42631228 42721166 42411110 41721085 41121087
39751153 39301175 38821198 38801231 39031251 39671256
40321265 40921271 41621282 42501276



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