(Click on any image to see larger image)
A relatively clear-cut mixed
case event occurred on 24 June, with a sea breeze providing the focus/trigger
for severe convection in RI and
Convection was expected across the northeastern
Thunderstorms initiated around noon in southern RI and SE MA, eventually becoming widespread thunderstorms with severe hail through the afternoon, as more storms from southern NH and central MA merged with the activity, resulting in some wind damage as well.
Attached are some 12Z soundings, surface plots with mesoscale analyses, radar, satellite and a couple of text products from NWS Taunton, MA (BOX). It is interesting to see how the weather evolves, and the NWS BOX forecasts and thought process. The Storm Prediction Center (SPC) issued a Mesoscale Discussion at 1207 PM EDT, did not identify the sea breeze role in the convection beginning to initiate, and eventually chose not to issue a watch box. SPC had our region in "See Text" all morning, then put much of
Once the convection formed, the warnings were definitely flying, and virtually all severe weather was warned with good lead times. There is no doubt that these are some EXTREMELY subtle features and were EXTREMELY difficult to resolve in real time, but it is good to see that this event behaved in a manner consistent with the research.
Figure 1. Skew-T Log-P display of 12Z 24 June raobs
Figure 2. a) MSAS station plot and surface dew points for 15Z 24 June, b) MSAS wind barbs and Theta-E for 15Z 24 June, and c) MSAS station plot, surface Theta-E and surface dew point for 18Z 24 June.
Figure 3. Satellite imagery from 24 June depicting a) water vapor imagery from 1415Z, b) visible imagery with lightning overlay at 1601Z, and c) visible imagery from 1815Z with lightning overlay.
Figure 4. Radar reflectivity from a) 16Z, b) 18Z, c) 20Z and d) 22Z.
Hail size key
Figure 5. Hail swaths through
Figure 6. Text products from NWS Taunton, MA depicting a) Area Forecast Discussion from 1010 AM 24 June, b) Area Forecast Discussion from 1146 AM 24 June, and c) Hazardous Weather Outlook from 446 AM 24 June.
Figure 7. Nowcasts from NWS Taunton, MA from a) 1105 AM 24 June, b) 1205 PM 24 June, c) 105 PM 24 June and d) 405 PM 24 June.
Severe weather reports for individual NWS offices, courtesy of The Iowa Environmental Mesonet division of Iowa State University Department of Agronomy