MD 1037 CONCERNING SEVERE THUNDERSTORM WATCH 270… FOR NORTHERN NORTH DAKOTA
Mesoscale Discussion 1037 NWS Storm Prediction Center Norman OK 1120 PM CDT Tue Jul 10 2018 Areas affected...Northern North Dakota Concerning...Severe Thunderstorm Watch 270... Valid 110420Z - 110615Z The severe weather threat for Severe Thunderstorm Watch 270 continues. SUMMARY...A wind damage threat is likely to continue for few more hours as a line of storms moves eastward across northern North Dakota. A new weather watch could be needed as the line approaches the eastern edge of the WW 270 around 0600Z although the risk should remain spatially and temporally limited. DISCUSSION...A well-developed linear MCS is ongoing across northwest North Dakota, which is located along a gradient of moderate instability. The RAP is estimating MLCAPE values across northern North Dakota in the 1500 to 3000 J/kg range. The line of storms is being supported by the moderate instability and by large-scale ascent associated with a shortwave trough moving eastward through the northern Plains near the top of an upper-level ridge. The WSR-88D VWP in northern North Dakota shows 0-6 km shear near 40 kt with backed east-southeasterly surface winds and strongly veering winds with height in the lowest 2 Km AGL. This wind profile will support bowing line segments within the MCS over the next few hours. A forward speed of around 50 kt will make wind damage possible along the leading edge of the linear MCS. ..Broyles/Grams.. 07/11/2018 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...FGF...BIS... LAT...LON 49200259 48740291 48240293 47960265 47910199 48119906 49149914 49330026 49280168 49200259
from SPC Mesoscale Discussions http://bit.ly/2suD0Qx
Be First to Comment