NAM(ETA) SHORT-RANGE FORECASTS

MSLP & Thick. 500 Z & VORT FCST 12H Prec 2M,850,700 T&6H PREC RA/SN SFC T/TD, WINDS CAPE, CIN, 0-6KM SHR PW, LI, Helicity EHI, SFC T, TD LCL HT, EHI B.R.N 850 Z,TD, WINDS 700 Z,RH, T,WINDS 250 Z,DIV, SPEED
06-hr 06-hr 00-06 06 hr 06-hr 06-hr 06 hr 06 hr 06 hr 06 hr 06 hr 06 hr 06 hr
12-hr 12-hr 00-12 12 hr 12-hr 12-hr 12 hr 12 hr 12 hr 12 hr 12 hr 12 hr 12 hr
18-hr 18-hr 06-18 18 hr 18-hr 18-hr 18 hr 18 hr 18 hr 18 hr 18 hr 18 hr 18 hr
24-hr 24-hr 12-24 24 hr 24-hr 24-hr 24 hr 24 hr 24 hr 24 hr 24 hr 24 hr 24 hr
30-hr 30-hr 18-30 30 hr 30-hr 30-hr 30-hr 30 hr 30 hr 30 hr 30 hr 30 hr 30 hr
36-hr 36-hr 24-36 36 hr 36-hr 36-hr 36-hr 36 hr 36 hr 36 hr 36 hr 36 hr 36 hr
42-hr 42-hr 30-42 42 hr 42-hr 42-hr 42-hr 42 hr 42 hr 42 hr 42 hr 42 hr 42 hr
48-hr 48-hr 36-48 48 hr 48-hr 48-hr 48-hr 48 hr 48 hr 48 hr 48 hr 48 hr 48 hr
54-hr 54-hr 42-54 54 hr 54-hr 54-hr 54-hr 54 hr 54 hr 54 hr 54 hr 54 hr 54 hr
60-hr 60-hr 48-60 60 hr 60-hr 60-hr 60-hr 60 hr 60 hr 60 hr 60-hr 60-hr 60-hr

ANIMATE THE NAM(ETA) IMAGES (select loop in far _blank column)
ANIMATED D(PROG)/DT (See how the model runs have been changing in their forecast)
Great Eta site (COD) with 84 hr images
NCEP SITE - all models every 6 hrs
Eta - AVN comparison from SPC

NAM(ETA) ISENTROPIC SURFACE MAP FORECASTS (290K,300K,310K):

Pressure, Winds, Mixing Ratio, and RH

12-hour ETA 290K 12-hour ETA 300K 12-hour ETA 310K
24-hour ETA 290K 24-hour ETA 300K 24-hour ETA 310K
36-hour ETA 290K 36-hour ETA 300K 36-hour ETA 310K
48-hour ETA 290K 48-hour ETA 300K 48-hour ETA 310K


PW (Precipitable Water) is a measure of total moisture in an atmospheric column
LI (Lifted Index) is a measure of instability (more negative-more severe potential, LI < -4 good)
Helicity (Storm-relative) indicates rotation potential (tornados more likely if SRH > 150 in region of high instability)
EHI (energy helicity index) likewise may help in forecasting supercells/tornadoes (values over 1.5 good)
LCL HT (Lifting Condensation Level height) may play a role in likelihood of storm's ability to produce tornadoes (values under 1500 m best)