Data available since January 1, 2004. Severe weather, tornado, thunderstorm, fire weather, storm report, tornado watch, severe thunderstorm watch, mesoscale discussion, convective outlook products from the Storm Prediction Center.

MCD #0417 - issued 0542 PM CDT Saturday, April 5 CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE AREAS AFFECTED...PARTS OF EASTERN KENTUCKY...EASTERN TENNESSEE...AND FAR WESTERN VIRGINIA VALID 052242Z - 052345Z Graphic. Current Watches. Radar Mosaics and Weather Watches; US: Northwest: Northcentral: Northeast:

2001年11月7日 · When conditions actually begin to shape up for severe weather, SPC often issues a Mesoscale Discussion (MCD) statement anywhere from roughly half an hour to several hours before issuing a weather watch. SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and freezing rain (see below).

Severe weather, tornado, thunderstorm, fire weather, storm report, tornado watch, severe thunderstorm watch, mesoscale discussion, convective outlook products from the Storm Prediction Center.

The IEM has a database archive of SPC MCDs since 2003. The download offered here does not contain the MCD text discussion, but the polygon geometry along with some metadata. The backend database that services this download updates in realtime, so the data should be as current as your download.

portions of middle and western TN. Over middle TN, 50 kt of 0-6 km. front. This is supporting ingestion of large boundary-layer. greater tornado risk here. Farther southwest into western TN, 50 kt. slightly elevated inflow and a greater risk for large hail. ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OHX...MEG...

The Storm Prediction Center (SPC) Mesoscale Discussions (MDs or MCDS) Web Service consist of polygon layers that displays SPC issued Mesoscale Discussions (MDs or MCDs) that focus on severe thunderstorm potential over the continental U.S. for the next 6 hours with an emphasis on the first 1-3 hours. SPC also issues MDs for mesoscale aspects of ...

The IEM maintains an archive of the watch polygons issued by the Storm Prediction Center since 1997. Please note that these watches are not the official spatial bounds anymore as the WCN (watch by county) product is the official coverage. Backend documentation exists in case you want to automate against this service.

Convective mesoscale discussions are issued by the National Oceanic and Atmospheric Administration ’s Storm Prediction Center based at the National Weather Center in Norman, Oklahoma. [1][2] One type of mesoscale discussion is a meso-gamma mesoscale discussion, which are for tornadoes believed to be at least EF2 on the Enhanced Fujita scale, or ...

SUMMARY...A severe thunderstorm watch is likely later this afternoon. for portions of Iowa into Northern Illinois and Southern Wisconsin. in anticipation of convective initiation, forecast to occur between. 19-21Z. Thunderstorms are expected to grow upscale quickly into a. bowing line, which will be capable of 80+ MPH winds, though 1.00+.