STEP 4:
Look for low level relative humidity trends to see if moisture will be available. Check to see if the FOUS60 Layer 1 relative humidity is greater than or equal to 85% with drier conditions aloft. Soundings can also be used to check for low level moisture and drier conditions aloft.
Station: MSP
Model: ETA
Run Time: 12Z 27JAN02
| Valid | Precip Accum | Lyr1 RH | Lyr2 RH | Lyr3 RH | 700 VV | LI | SFC Prs | Bndry Lyr Wind | 1000-500 Thickness | Lry 1 Temp | Lyr 3 Temp | Lyr 5 Temp |
| 27/12Z | --- | 69% | 26% | 63% | 1.2 | 5 | 1007 | 2413 | 5530 | 3 | 9 | 6 |
| 27/18Z | 0.00 | 82% | 19% | 59% | 1.9 | 9 | 1008 | 2511 | 5530 | 0 | 10 | 6 |
| 28/00Z | 0.00 | 97% | 39% | 61% | 1.0 | 10 | 1010 | 3013 | 5490 | 0 | 3 | 4 |
| 28/06Z | 0.00 | 98% | 42% | 52% | 2.1 | 14 | 1015 | 0118 | 5430 | -3 | -4 | 0 |
| 28/12Z | 0.00 | 95% | 60% | 55% | -0.3 | 13 | 1019 | 3617 | 5380 | -7 | -5 | -1 |
| 28/18Z | 0.00 | 89% | 69% | 41% | -0.9 | 15 | 1020 | 0113 | 5350 | -9 | -7 | -1 |
| 29/00Z | 0.00 | 89% | 68% | 48% | 0.9 | 17 | 1019 | 0117 | 5320 | -9 | -9 | -4 |
| 29/06Z | 0.01 | 86% | 84% | 25% | -1.6 | 17 | 1023 | 0117 | 5260 | -13 | -12 | -9 |
| 29/12Z | 0.02 | 84% | 82% | 27% | -3.0 | 16 | 1024 | 0115 | 5230 | -16 | -13 | -11 |
| 29/18Z | 0.05 | 83% | 77% | 14% | 2.8 | 14 | 1028 | 3510 | 5190 | -15 | -15 | -13 |
| 30/00Z | 0.02 | 84% | 55% | 16% | -0.5 | 12 | 1028 | 3308 | 5170 | -14 | -14 | -13 |
Station: MSP
Model: NGM
Run Time: 12Z 27JAN02
| Valid | Precip Accum | Lyr1 RH | Lyr2 RH | Lyr3 RH | 700 VV | LI | SFC Prs | Bndry Lyr Wind | 1000-500 Thickness | Lry 1 Temp | Lyr 3 Temp | Lyr 5 Temp |
| 27/12Z | --- | 65% | 29% | 67% | -0.4 | 7 | 1008 | 22008 | 5530 | 5 | 9 | 6 |
| 27/18Z | 0.00 | 69% | 20% | 68% | 1.0 | 9 | 1007 | 2610 | 5520 | 1 | 10 | 6 |
| 28/00Z | 0.00 | 82% | 31% | 94% | 0.0 | 12 | 1012 | 3418 | 5480 | 0 | 3 | 4 |
| 28/06Z | 0.00 | 96% | 40% | 76% | 0.4 | 13 | 1017 | 0117 | 5430 | -6 | -2 | 2 |
| 28/12Z | 0.00 | 95% | 57% | 59% | -0.8 | 13 | 1021 | 0312 | 5370 | -10 | -5 | 0 |
| 28/18Z | 0.00 | 86% | 73% | 59% | 1.3 | 13 | 1022 | 0407 | 5340 | -10 | -8 | 0 |
| 29/00Z | 0.00 | 95% | 70% | 71% | 2.0 | 14 | 1018 | 0410 | 5340 | -8 | -11 | -1 |
| 29/06Z | 0.00 | 95% | 68% | 29% | -0.3 | 16 | 1020 | 0410 | 5290 | -9 | -14 | -5 |
| 29/12Z | 0.00 | 96% | 83% | 23% | 0.0 | 14 | 1020 | 0309 | 5240 | -10 | -16 | -5 |
Here are the 850mb RH charts (light blue and green is higher RH) from the 12Z January 28th ETA model run for 12Z January 28th, 18Z January 28th, 00Z January 29th, and 06Z January 29th.
