National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FXUS63 KIWX 211927
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
327 PM EDT Sun Apr 21 2024

.KEY MESSAGES...

- Dry and cool this weekend with frost possible tonight into Monday
  morning.

- Showers Tuesday, turning cool Wednesday-Thursday

- Big warmup next weekend

&&

.DISCUSSION...
Issued at 259 PM EDT Sun Apr 21 2024

Ridging over the upper Midwest building into the region today
which will allow for clearing skies and light winds which makes
for good radiational cooling conditions. Have issued a Frost
Advisory across the entire CWA from Midnight EDT tonight until 8
AM EDT tomorrow morning. There is a concern though that the
synoptic warming with the incoming ridge may offset some of the
cooling however even if that happens some areas such as low
lying areas and especially the northeastern portions of the CWA
will see the potential for some frost. In this case took a
better safe than sorry approach. So you may want to protect
those cold sensitive plants and animals overnight tonight as
lows 31-38 degrees will be possible.

With ridging moving in further on Monday should see the high
temperatures rebound nicely with highs back into the 60s.
Troughing begins to move in on Tuesday which will bring
increased chances of showers with a slight chance of a rumble of
thunder or two Tuesday afternoon. Winds will also be breezy to
gusty with gusts around 25 mph possible. The trough will start
a cooling trend across the area for Tuesday through Thursday
when highs on Wednesday will only get into the 50s while by
Thursday morning we see another cold morning with the
possibility of frost. Lows on Thursday morning will be in the
upper 20s to lower 30s. Of course any lingering clouds could
keep things a bit warmer so will need to keep monitoring that
situation.

By the end of the week and into the weekend higher amplitude
ridging will bring warmer temperatures and by the weekend highs
will be in the 70s. On Sunday, a few locations may flirt with
the lower 80s. With the warmer temperatures we will also see an
increase in showers and thunderstorms.

&&

.AVIATION /18Z TAFS THROUGH 18Z MONDAY/...
Issued at 1230 PM EDT Sun Apr 21 2024

GOES East satellite imagery depicts clouds moving off to the
southeast this afternoon. By the start of the TAF cycle, KSBN
should have clear skies and KFWA may still have a few clouds,
but clearing will be quickly approaching. VFR conditions prevail
through the TAF period. Winds are starting to pick up this
afternoon, with gusts up to 20 kts possible before 00Z tonight.
Overnight, winds become much lighter. Calm winds and clear skies
persist overnight and into Monday morning.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...Frost Advisory from midnight EDT /11 PM CDT/ tonight to 8 AM
     EDT /7 AM CDT/ Monday for INZ005>009-012>015-017-018-020-
     022>027-032>034-103-104-116-203-204-216.
OH...Frost Advisory from midnight tonight to 8 AM EDT Monday for
     OHZ001-002-004-005-015-016-024-025.
MI...Frost Advisory from midnight tonight to 8 AM EDT Monday for
     MIZ078>081-177-277.
MARINE...None.

&&

$$

DISCUSSION...Andersen
AVIATION...Johnson