Forecasting mistakes
Chase forecasting mistakes
Every new chaser makes the same mistakes. Here are the biggest ones — and how to avoid them.
Mistake 1: Chasing the SPC High Risk
SPC High Risk days are famous. They're also busted often. Meanwhile, Slight Risk days sometimes produce significant tornadoes.
- High Risk based on ensemble probability, not certainty.
- Chaser convergence makes High Risk days worse for photography.
- Chase what YOU forecast, not what SPC advertises.
- Ordinary chase-day setups can be gems if you target right.
Mistake 2: Trusting the HRRR blindly
- HRRR is excellent but not gospel.
- HRRR sometimes fires storms 100 miles from where they actually fire.
- Overconfidence in HRRR = chase dead sky.
- Use HRRR + reality check.
- Watch how HRRR trended in this pattern historically.
- Compare with NAM 3km + observations.
Mistake 3: Fixating on CAPE
CAPE is instability. Big CAPE doesn't mean big tornadoes.
- Some famous outbreaks had modest CAPE (500-1500 J/kg).
- Some non-events had 4000+ J/kg.
- CAPE without shear = pop-up storms.
- CAPE without low-level rotation = high-based storms.
- Look at STP, SCP, effective SRH.
- Look at LCL height.
- Look at winds at multiple levels.
Mistake 4: Ignoring CIN (the cap)
- The cap is the warm layer aloft that prevents storms from firing.
- Cap holds until sun heats surface enough to break it.
- Cap can hold too long — dead chase day.
- Cap can break too early — messy storms.
- Check CIN forecast.
- Check surface temperature vs cap temperature.
- Cap breaks = 3-5 PM typically.
Mistake 5: Wrong target zone
- Chasing where storms are POSSIBLE isn't the same as OPTIMAL.
- Best target: dryline / cold front intersection.
- Best target: where surface convergence maximizes.
- Best target: 50-100 miles ahead of dryline.
- Not the highest CAPE spot necessarily.
- Not the SPC highest risk polygon exactly.
- Read mesoanalysis to find the sweet spot.
Mistake 6: Forgetting logistics
- Where's fuel?
- What roads are gravel?
- Where's the hotel tonight?
- What time is the hotel accepting late check-in?
- Where's cell service?
- Where's dinner if this chase runs late?
- Where's the tornado warning polygon overlap with civilization?
- These matter more than you think.
Mistake 7: Too committed to target
- Set target. Position. Then be willing to abandon.
- Storms fire where they fire.
- Chasers who rigidly stick to targets miss the day.
- Flexibility is a virtue.
- But don't chase every cell — you'll never intercept anything.
- Balance conviction with adaptation.
Mistake 8: Forgetting golden hour
- Storm structure most photogenic at sunset.
- Photograph EVERY sunset supercell.
- Photography-only days when tornadoes don't drop.
- Some best photos come from ordinary supercells at 8 PM.
Mistake 9: Confusing model output with forecast
- HRRR output is a MODEL result, not a FORECAST.
- A forecast synthesizes model with observations, expertise, uncertainty.
- Screenshotting a single model run and calling it forecast = amateur.
- Read SPC. Read local WFO discussions. Read multiple models.
- Then form your forecast.
Mistake 10: Chase log fatigue
- Not logging chase days = not learning.
- Log setup, target, result.
- Compare with reality afterward.
- Where did you go wrong?
- What patterns did you miss?
- What did you get right?
- Chasers who log grow. Chasers who don't plateau.
Mistake 11: Neglecting communication
- Failing to text partner during chase.
- Not checking in with home base.
- Getting into radio dead zone unnoticed.
- Ham radio not tuned.
- Backup comm not available.
Mistake 12: Chasing tired
- Fatigue-driven decisions kill chasers.
- Sleep debt accumulates.
- Rest days between chase clusters.
- Rotate driving.
- Coffee is not sleep.
- Nap when possible.
- Chase log will show fatigue-linked bad calls.
Mistake 13: Not accepting bust days
- You will bust often.
- Even pros bust regularly.
- Bust doesn't mean you were wrong — atmosphere is uncertain.
- Learn from bust. Don't self-flagellate.
- Next chase day is coming.