Weather: Tonight, Tomorrow, Next Day, Five Days, and Intermediate-Term Outlooks for the U.S. and a Six-Day Forecast for the World: posted June 21, 2023

Updated at 3:57 p.m. Wednesday, June 21, 2023

Here is what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term outlooks and a five-day World weather forecast.

We start with the U.S. Information.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
302 PM EDT Wed Jun 21 2023

Valid 00Z Thu Jun 22 2023 – 00Z Sat Jun 24 2023

…Heat wave to persist from eastern/southern New Mexico across much of
Texas…

…Wet weather across much of the eastern U.S. and through the Plains…
 

First, the 48-Hour Forecast (It is a 48 to 72 Hour Forecast actually)

Daily weather maps. The Day 1 map updates twice a day and the Day 2 and 3 maps update only once a day. These maps update automatically. But if that does not happen, you can get updates by clicking HERE

TODAY (or late in the day the evening/overnight map will appear)

TOMORROW

NEXT DAY

This animation shows how things may play out over the next 60 hours. To update click here.

The NWS Climate Prediction Center’s: Watches, Warnings, and Advisories plus other information can be found HERE.

ATMOSPHERIC RIVERS

This tells us what is approaching the West Coast. Click HERE to update If I have not gotten around to doing the update.   Here is some useful information about Atmospheric Rivers.

Continuation of the NWS Short Range Forecast. It is updated by NWS twice a day and these updates can be found here. We post at least one of those updates daily, sometimes both. The Highlights are shown in the lede paragraph of this article.

The large scale flow across the nation is forecast not to change
appreciably during the first few days of summer, remaining highly
amplified. This pattern will be characterized by a slow moving upper low
stretching from the Southeast into the Ohio Valley, an upper ridge
centered across the Southern Plains and another strong upper low pushing
inland from California into the Northern Rockies. The slow moving eastern
closed low will support a broad region of precipitation over the next few
days, stretching from Florida, northward through the Southeast, Southern
to Central Appalachians, Mid Atlantic into the Ohio Valley. The southern
portions of these areas have seen much above average precipitation over
the past few weeks with totals 300 to 600% of normal across the Southeast,
North Florida into portions of the Carolinas and far southwest Virginia.
Additional heavy rainfall potential across these areas will pose the
threat of flash flooding. Farther to the north, the rainfall will be much
welcomed across the Ohio Valley into the Mid-Atlantic where moderate
drought conditions exist.

Wet weather also likely over the next few days across large portions of
the mid section of the nation from the Northern Plains, southward into
portions of the Central to Southern Plains. Similar to portions of the
Southeast, large sections of the Central to Northern Plains have also seen
much above average precip over the past few weeks with the potential
additional heavy rains also posing a flash flood threat across this area.
In addition to a flash flood threat, thunderstorms across the mid section
of the nation will also pose a severe weather threat with large hail and
high winds the greatest threat, along with a lesser threat for tornadoes.
Across areas of the east and central U.S. that have higher rainfall
chances over the next few day, high temperatures will be below to much
below normal. Record low maximum temperatures are possible Thursday
across portions of the Southern Appalachians from Upstate South Carolina,
eastern Tennessee into Southwest Virginia.

While wet weather and below average temperatures affect large portions of
the eastern and central U.S., the record breaking heat wave will persist
from eastern and southern portions of New Mexico, east across large
portions of Texas. An upper ridge is forecast to remain centered across
these regions, supporting a continuation of much above average to record
high temperatures, along with high heat indices from very humid conditions
combined with the very high temperatures. Excessive Heat warnings and
heat advisories are in effect across much of Texas into southern and
southeastern New Mexico. There may be a brief respite from the very hot
temps for northern Texas over the next two days in the vicinity of a
stationary front which will support increased clouds and rain chances.
However, this will be short lived with triple digit heat rebuilding across
this area this weekend into early next week. To the south of this, triple
digit heat will be unrelenting from south and eastern New Mexico, across
much of central to south Texas. Across these areas, near record to
record high temperatures are possible through the remainder of the week
into next week, along with dangerous heat indices values. An elevated
fire weather risk is also possible over the next few days from eastern
Arizona, across much of New Mexico. Dry conditions, low relative
humidities and windy conditions will support the enhanced fire risk, with
this risk likely continuing into the weekend and early next week given
little expected change to the overall weather pattern across this portion
of the nation.

Learn about wave patterns HERE.

Below is the current five-day cumulative forecast of precipitation (Updates can be found HERE)