FXUS63 KIWX 261755

AFDIWX



Area Forecast Discussion

National Weather Service Northern Indiana

155 PM EDT Thu Jun 26 2025



.KEY MESSAGES...



- Hot and humid conditions continue today resulting in a High 

  heat risk.



- Marginal Risk of severe thunderstorms through this evening

  with strong gusty winds and excessive rainfall the main

  threats.



- Slightly more mild temperatures on Saturday before a brief

  warm up again on Sunday and Monday.



&&



.DISCUSSION...

Issued at 151 PM EDT Thu Jun 26 2025



Another hot and humid day with highs topping out around 90 

degrees and heat indicies near 100 after you combine in the 

humidity. Sensitive populations should continue to take extra 

precautions against the heat. Moderate to strong instability 

and PWAT around 1.6in will promote convection through the rest 

of the afternoon, as we have already begun to see late morning 

and early afternoon across the Michiana region. Weak overall 

shear will inhibit sustained updrafts, and storms should be 

pulse-like with strong gusty outflow winds being the predominant

threat (in addition to lightning and localized heavy rain, of 

course). 



A cold front will eventually work its way into the area on 

Friday. Additional showers and storms will be expected (60-70% 

chance) as this front moves through the area. By Saturday, 

temperatures will have "cooled" down slightly into the low-mid 

80s. Rain chances favor the southern half of our forecast area 

on Sat.



Warmer temperatures return Sunday and Monday. However, surface 

high pressure building over the Central Plains and troughiness 

returning to Ontario/Great Lakes region which will cool us down 

a little bit for the first couple of July days. Hopefully the 

return of dewpoints back in the 60s vs the 70s we've been 

experiencing will be a welcome relief.



&&



.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...

Issued at 133 PM EDT Thu Jun 26 2025



Tstms have fired across southern MI between the I94 and I80

corridors while more widely sctd across nrn IN.This trend is

expected to continue through the rest of the aftn and evening

period, so will emphasize the SBN terminal site for convection 

through 00Z. Thus far, the storms have remained below svr

criteria as they are pulse in nature. The flow is predominately

SW for both sites and will carry this into the night hours then

winds turn more southerly overnight at KSBN. The heat and

elevated humidity levels continue Friday and coupled with the 

upper ridging weakening, expect a continuation of tstm 

development with daytime heating.



&&



.IWX WATCHES/WARNINGS/ADVISORIES...

IN...Heat Advisory until 8 PM EDT /7 PM CDT/ this evening for 

     INZ005>009-012>015-017-018-020-022>027-032>034-103-104-

     116-203-204-216.

OH...Heat Advisory until 8 PM EDT this evening for OHZ001-002-004-

     005-015-016-024-025.

MI...Heat Advisory until 8 PM EDT this evening for MIZ078>081-177-

     277.

MARINE...None.



&&



$$



DISCUSSION...Norman

AVIATION...Frazier

