Here is a concise summary of the provided text:
**Current Weather Situation:**
* Unusual severe weather pattern in the US, with:
+ Record cold temperatures and a heat wave simultaneously
+ Tornadoes, giant hailstones, and storms across the country
+ Torrential rain and severe thunderstorms expected in the South on Tuesday
+ Mountain snow in the West on Tuesday
**Upcoming Weather Concerns:**
* **Wednesday-Thursday:** Heat wave in the central US and Canada, with organized clusters of thunderstorms (Mesoscale Convective Systems)
* **Weekend-Next Week:** Concerns for flash flooding as a cutoff low exits the US, followed by a brief period of quiet weather
**Tropical Weather Alert:**
* Unusually warm Atlantic Ocean waters fueling early tropical system development near Africa
* Two waves being monitored, with a high likelihood of one becoming Tropical Storm/Hurricane Brett, potentially threatening the US (Puerto Rico and/or the Gulf of Mexico)
**Actionable Advice:**
* Residents in the Southeast US: prepare for flash flooding
* Coastal residents: review and prepare hurricane emergency plans due to the unusual early tropical activity.
Here are the key facts extracted from the text, numbered and in short sentences, without opinions:
**Weather Events**
1. Unusual amounts of tornadoes, giant hailstones, and severe storms occurred across the US over the past week.
2. A pattern is developing, causing record cold temperatures and a heat wave simultaneously in the US.
3. Two concerning cyclones are brewing off the coast of Africa, potentially affecting the US in over a week.
**Short-term Forecast (Tuesday-Wednesday)**
4. Torrential rain and severe thunderstorms are expected in the southern US on Tuesday.
5. The Storm Prediction Center issued two separate slight risks of severe weather for Tuesday.
6. Strong winds and hail are possible in the Southeast on Tuesday.
7. Multiple rounds of showers and thunderstorms will occur from Shreveport, LA to Raleigh, NC, on Tuesday.
8. An expansive outlook for excessive rainfall was issued for Tuesday, highlighting flash flooding risks.
9. Mountain snow is expected in the western US on Tuesday due to a low-pressure system.
10. Temperatures will be 15-20 degrees below normal in the western US on Tuesday.
11. A large heat wave will build through the middle of the country and into central Canada on Wednesday.
12. Texas will experience temperatures over 100°F on Wednesday, while parts of northern Canada will reach the 90s.
**Weather Systems**
13. A "cutoff low" (an area of low pressure) is causing moisture to accumulate over the Gulf of Mexico.
14. This cutoff low is unusual for June and will take the entire weekend to clear the US.
15. A ridge will widen in the west by Sunday, leading to a brief period of quiet weather.
**Tropical Activity**
16. The Atlantic Ocean has extremely anomalous sea surface temperatures, fueling tropical systems near Africa.
17. Every wave coming off Africa currently has the potential to become a hurricane.
18. The National Hurricane Center is monitoring two waves, which may develop into Tropical Storm or Hurricane Brett.
19. Model data suggests one of these storms may intensify and move towards Puerto Rico.
**Preparedness**
20. Residents in coastal areas are advised to prepare their hurricane preparedness plans.