Sample prep sheet from the Virga prototype, built automatically from NWS, NOAA and model data. Nothing here is hand-edited.

Forecast Prep — Thu Oct 22, 2026

Evening show · LIVE 9:06 PM EDT · models: ECMWF, GEM, GFS, ICON, HRRR, NAM, NBM
AFD 719 PM EDT Thu Oct 22 2026 · PFM 226 PM EDT Thu Oct 22 2026

Top stories cold open

Talking points

Almanac yesterday + today so far

StationYest. highYest. lowRainPeak gustToday so far hi/lo
Knoxville74°42°0973° / 43°
Chattanooga78°43°01076° / 43°
Tri-Cities75°34°01371° / 36°
Crossville74°39°01172° / 40°
Knoxville normal today 69°/46° · record high 86° (1947) · record low 25° (1987)

Big picture NWS Morristown, SPC, alerts, tropics

No MRX watches, warnings or advisories in effect.
SPC: no severe or thunder risk for our points, days 1-3.
Tropics: PTC Josephine 55 kt; TS Vance 55 kt
MRX key messages (719 PM EDT Thu Oct 22 2026)
Updated at 709 PM EDT Thu Oct 22 2026

- Early morning patchy fog potential continues near rivers and lakes.

- Dry weather dominates the forecast period, with cool mornings
  and pleasant afternoons each day. Afternoon relative humidity
  will remain on the lower side as well, but light winds will
  prevail.
Full discussion

Discussion

Issued at 131 PM EDT Thu Oct 22 2026

Clear skies have taken over across CWA after a little fog was seen 
earlier this morning near TRI and across our southern counties. High 
pressure continues to dominate our forecast for the foreseeable 
future. This spells temperatures a degree or two above normal during 
the afternoons and cooler mornings with patchy fog. The biggest 
challenge over the next several days will be dew points and dry air 
aloft mixing down to the surface pushing RH values lower than what 
NBM guidance would otherwise suggest. As far as fire weather goes, 
the saving grace of light winds throughout the period will mitigate 
any great concerns. As dry as it is and has been, we'd be having a 
widespread fire danger if it wasn't for these light winds.

Where's all the precipitation? Well, it currently resides out west, 
especially over the Four Corners region and is being blocked from 
getting to us by this high pressure over the center of the country. 
Long range guidance would suggest that this blocking pattern will 
start to break down by the middle of next week with our first chance 
of rain potentially getting to us by next weekend -- just in time 
for Halloween. While that sounds ghoulish, that solution is only in 
the GFS. The Euro keeps us dry right through Halloween weekend. For 
now, enjoy this consistently comfortable weather. It's bound to end 
eventually.

Aviation

(00Z TAFS)
Issued at 709 PM EDT Thu Oct 22 2026

VFR conditions will continue with clear or nearly clear skies
throughout this TAF cycle. The only exception is the possibility 
of brief morning fog near TRI. Northeasterly winds will be light.

Mrx Watches/Warnings/Advisories

NC...NONE.
TN...NONE.
VA...NONE.

Local forecast by region Tomorrow high · low tomorrow morning

RegionHighLowRainModels wetGust
Northern Plateau68–69°upper 60s43°low 40s00%16
Southern Plateau69°upper 60s43°low 40s00%14
Western Valley71–72°low 70s50–51°low 50s00%16
Southern Valley73°low 70s46–48°mid to upper 40s00%15
Central Valley71°low 70s44–46°mid 40s00%17
Northern Valley68–70°upper 60s to low 70s38–42°upper 30s to low 40s00%13
NE TN Mountains66–69°mid to upper 60s37–42°upper 30s to low 40s00%15
Foothills70°low 70s44–47°mid to upper 40s00%12
Smokies High Peaks49–58°upper 40s to upper 50s35–40°mid 30s to low 40s00%13
Ranges span the points in each region (consensus of models at each point). Rain = consensus inches; Models wet = share of models with ≥0.05".

Model check — Knoxville who agrees, who's the outlier, what changed since yesterday

DayECMWFGEMGFSICONHRRRNAMNBMCons.NWSSpreadvs 24h ago
Today71/43
0"
71/39
0"
73/41
0"
72/43
0"
73/41
0"
73/42
0"
72/47
0"
72/42
0"
–/–
2°
Tomorrow70/46
0"
68/40
0"
73/44
0"
71/44
0"
73/44
0"
69/48
0"
72/44
0"
71/44
0"
72/43
0%
5°
Sat 10/2470/46
0"
68/35
0"
71/42
0"
71/41
0"
–69/45
0"
72/44
0"
71/43
0"
72/41
0%
4°
Sun 10/2570/46
0"
69/35
0"
71/45
0"
70/40
0"
––72/43
0"
70/43
0"
–/44
3°
Mon 10/2671/44
0"
68/36
0"
71/45
0"
70/37
0"
––72/42
0"
71/42
0"
71/–
0%
4°
Tue 10/2774/46
0"
70/38
0"
74/46
0"
74/38
0"
––74/44
0"
74/44
0"
72/44
0%
4°+2°
Wed 10/2872/52
0"
69/37
0"
75/49
0"
70/42
0"
––73/47
0"
72/47
0"
74/45
0%
6°+2°
Thu 10/2973/47
0"
68/47
0"
73/47
0"
72/41
0"
––73/46
0"
73/47
0"
74/47
0%
5°
High/low °F with daily rain beneath. Highlighted = model ≥4° off the pack. Spread = warmest minus coolest model high (≥6° flagged = low confidence). vs 24h ago = change in the consensus high since yesterday's runs.

7-day — Knoxville with normals

DayHighLowNormalvs normalRainConfidenceHow to say it
Today72°42°69/464° above normal0" · 0%highlow 70s; dry
Tomorrow71°44°69/46near normal0" · 0%mediumupper 60s to low 70s; dry
Sat 10/2471°43°69/45near normal0" · 0%highupper 60s to low 70s; dry
Sun 10/2570°43°68/45near normal0" · 0%highupper 60s to low 70s; dry
Mon 10/2671°42°68/453° above normal0" · 0%highupper 60s to low 70s; dry
Tue 10/2774°44°68/446° above normal0" · 0%mediumlow to mid 70s; dry
Wed 10/2872°47°67/445° above normal0" · 0%mediumupper 60s to mid 70s; dry
Thu 10/2973°47°67/436° above normal0" · 0%mediumupper 60s to low 70s; dry
Rain % = share of models with ≥0.05" that day (a stand-in for PoP).

Extended — ensembles GEFS + ECMWF members, Knoxville

DayHigh 10%Median90%Chance ≥0.1"Normal
Tue 10/2769°72°76°0%68
Wed 10/2869°72°74°0%67
Thu 10/2970°72°75°0%67
Fri 10/3067°73°77°2%66
Sat 10/3162°73°79°11%66
Sun 11/161°71°80°55%66
Mon 11/261°72°82°35%65
Tue 11/356°68°80°33%65
Wed 11/453°64°79°24%64
Thu 11/551°64°79°27%64

Hooks what viewers are planning around

Virga prep sheet · generated 10/22 9:06 PM · numbers computed from public NWS, NOAA and Open-Meteo data; verify before air.