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000
FXUS63 KBIS 140951
AFDBIS

Area Forecast Discussion
National Weather Service Bismarck ND
451 AM CDT Sun Apr 14 2024

.KEY MESSAGES...

- Shower and thunderstorms likely early this week, turning to
  snow chances in the north Wednesday to Friday night.

- Expect breezy to windy conditions every day this week.

- Colder temperatures Wednesday night through Friday.

&&

.DISCUSSION...
Issued at 450 AM CDT Sun Apr 14 2024

Surface high pressure and a shortwave ridge is leading to clear
skies and calm winds this morning. Today won`t be as warm as
yesterday but still mainly in the 70s. We used the NBM 50th
percentile to raise temperatures, especially in the southwest
where a nice thermal ridge moves over today. Yesterday we over
preformed the NBM with highs getting into the lower 80s, so that
is why we raised temperatures today.

The big low pressure system will move through the western CONUS
today, and start affecting us this evening when flow turns
southwest. A slight chance of showers and maybe a thunderstorm are
possible in the north and west while the shortwave ridge moves
through. Once the ridge is through tonight, the chances for
showers and thunderstorms goes up as the low pressure will be on
the east side of the Rockies. Southerly diffluent flow will
exist over the state Monday and Monday night. CAPE values Monday
morning through the day look to be around 300-500 J/kg with a
good amount of shear to produce thunderstorms. Non-severe
storms are expected with that low of CAPE. The SPC has the
marginal risk ending on the South Dakota side of the North
Dakota South Dakota border Monday. The CAMs have the most
aggressive storms developing in western SD and traveling north,
so we might get the leftover storms from SD that may or may not
be severe late Monday evening. This is when the chance for
storms looks the greatest with the CAPE and shear. On the far
southern end of this system in Oklahoma, severe storms are
likely, so they might take some energy from getting up here for
our storms. Total QPF through the week is just shy of 0.50
inches in the west to just over an inch in the south and east.
This will be some much needed moisture with the lack of snow
this winter.

Tuesday another upper low develops to the northwest of this low,
creating a double low that will impact us all week. Winds will
be breezy to windy all week with tight pressure gradient winds,
and cold air advection starting Wednesday. Wednesday is when
the second low drops in from Canada, lower temperatures to the
30s and 40s, with lows overnight in the 20s. A cold front will
also sweep through west to east. So a chance of snow is possible
the rest of the week, mainly north of Highway 2.

&&

.AVIATION /06Z TAFS THROUGH 06Z MONDAY/...
Issued at 450 AM CDT Sun Apr 14 2024

VFR with clear skies and calm winds until late this morning
when scattered mid level clouds move in. Winds will gust up to
25kts by Sunday night from the north. Scattered showers and
thunderstorms are possible Sunday evening through the overnight,
but did not include in TAF yet.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...Smith
AVIATION...Smith