SPC Mesoscale Discussions

Short-fuse forecast reasoning, watch potential and the environment SPC is monitoring now.

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Lower 48 · Click a polygon to open the discussion

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National discussion desk

Active SPC MDs

Polygons are colored by discussion type.

Tornado watch Watch likely / severe watch Watch possible Watch unlikely Winter weather General discussion

Latest analysis ingredients

Every layer uses the most recent mesoanalysis time.

MRMS radar MLCAPE fill MUCAPE fill MLCIN contours 0–1 km SRH contours 0–3 km SRH contours MSL pressure contours 500 mb height contours 850 mb height contours PWAT contours 0–6 km bulk-shear barbs 850 mb wind barbs 500 mb wind barbs Surface observations

Winter discussion ingredients

Matched to the latest winter discussion and mesoanalysis time.

Precipitation & visibility

MRMS precipitation type MRMS RALA radar 1-hour snowfall fill Freezing-rain accretion fill Snow-depth fill Visibility fill

Thermal profile

Wet-bulb rain/snow contours Surface temperature transition contours 925 mb temperature contours 850 mb temperature contours

Forcing & banding

700 mb deformation fill Mid-level lift contours 700 mb omega contours 700 mb RH contours Low-level lift contours

Wind & observations

MSL pressure contours 3-hour pressure-change contours Surface wind barbs 850 mb wind barbs 700 mb wind barbs Surface observations

Use with care Mesoscale discussions describe evolving potential. Follow official NWS warnings for life-safety decisions.

SPC discussion feed

Active Mesoscale Discussions

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