


Area Forecast Discussion
Issued by NWS Topeka, KS
Issued by NWS Topeka, KS
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
354 FXUS63 KTOP 101050 AFDTOP Area Forecast Discussion National Weather Service Topeka KS 550 AM CDT Thu Jul 10 2025 .KEY MESSAGES... - Morning storms should fall apart leaving hot conditions this afternoon. - Higher chances for showers and storms is forecast for Friday and Friday night. - There is a risk storms Friday could have damaging winds and heavy rainfall. && .UPDATE... Issued at 550 AM CDT Thu Jul 10 2025 The thunderstorms that formed over central NEB have shown a slow weakening trend over the last hour. An I though that the earlier storms that moved across southeast NEB may have increased inhibition. But the elevated nature of the storms is allowing them to develop south into northern KS. Profiler data also suggests there may be a MCV moving through central NEB. So think these showers and storms could persist into the mid-morning hours while the mid level convergence from the low level jet continues. Have added some 20 to 30 percent chance POPs across north central KS to account for this. The precip over northeast KS continues to weak and the storms that developed near Ottawa should continue to move east and out of the area over the next hour or so. If storms can persist into the late morning or early morning as the boundary layer deepens, there may be a risk for strong convection to develop. None of the CAMs show this and still think the advecting EML should keep the boundary layer capped. && .DISCUSSION... Issued at 248 AM CDT Thu Jul 10 2025 07Z water vapor imagery showed upper ridging over the southwest with a shortwave trough moving into the northern Rockies. A linear MCS was making it`s way through eastern NEB and approaching northeast KS. At the surface, a trough of low pressure was noted in the lee of the central Rockies with weak high pressure to the east of the area. Not a great deal of change in the forecast for today and unfortunately the confidence in the forecast hasn`t changed a lot either. This morning`s convection was suppose to be weakening as it encountered increasing CIN over northeast KS and it is beginning to show signs of weakening. Still have increased POPs across the northern counties where it looks like storms should push into the area. But does an MCV linger this afternoon and will is be over northeast KS or further to the north and east. Based on current obs and water vapor imagery, think if there will be a MCV it may influence the weather more over northern MO than here. Aside from that, the models show the surface boundary remaining to the west of the forecast area through the afternoon with warming mid level temps as an EML advects northeast. 700MB temps are progged to increase to between +12 and +15C across central and into northeast KS. So with out an obvious forcing mechanism or boundary to focus convergence, think the daytime hours are most likely to remain dry. Today looks to be one of the hottest days with parts of north central KS approaching 100 degrees. Dewpoints are forecast to mix out into the middle 60s. This is expected to keep heat indices around 100 so conditions for a heat advisory appear to be marginal. The day shift can watch dewpoints to see if heat indices may end up higher. The surface front, which is progged to be a little slower, is forecast to approach north central KS tonight and gradually move into the area by Friday evening as shortwave energy passes mainly north of the forecast area. There are questions about severe potential tonight, especially if storms hold off until the overnight period as surface based CIN should be on the increase. But Friday afternoon and evening may be the time when severe potential is highest. Instability south of the boundary should be plentiful with some modest bulk shear of 25 to 35KT. With freezing levels around 14 KFT, it looks to be difficult for storms to produce hail unless a discrete supercell can organize a solid mesocyclone. So damaging winds and heavy rainfall look to be the main hazards. Models show the higher QPF amounts Friday night as the boundary slides south. So this is when the highest POPs are in the forecast. With the slower progression of the frontal boundary, the POPs Saturday are a little higher then the prev forecasts had. After Saturday, a quasi zonal pattern develops with no obvious synoptic scale energy progged to impact the area. So the general 10 to 20 percent chance POPs are in the forecast given the expected return of a conditionally unstable airmass. The next synoptically driven chance for precip looks to be Tuesday or Wednesday as another shortwave passing through the northern plains potentially brings a front into the area. There are some differences between the GFS and ECMWF starting to show up with the timing of the trough and boundary. So the confidence in the forecast is a little lower. Stuck with the blend which still has chance POPs in the forecast for Tuesday through Wednesday night. This may be overly broad but given the lower predictability is probably warranted. && .AVIATION /12Z TAFS THROUGH 12Z FRIDAY/... Issued at 550 AM CDT Thu Jul 10 2025 With none of the CAMs handling the ongoing convection very well, the forecast mainly is just an extrapolation of current trends. Don`t have enough confidence in storms west of CNK holding together long enough to impact MHK, and the stuff north of TOP continues to dissipate. So will keep a dry forecast in the short term and adjust to trends. Overnight convection is forecast to mainly stay west of MHK and think probs are around 20 percent after midnight. So again will leave out any mention of precip. A strengthening pressure gradient is expected to cause southerly winds to become gusty. Overall think VFR conditions should prevail. && .TOP WATCHES/WARNINGS/ADVISORIES... None. && $$ UPDATE...Wolters DISCUSSION...Wolters AVIATION...Wolters