Interstates and NWS county warning areas

[CNGL-Leudimin]

Inspired by the "Which Interstate goes through the most area codes?", I figured out I should combine roads and weather, and see which ones cross the most NWS county warning areas. Here is a complete list of 2 digit Interstates, and which forecast areas they cross.
2: Brownsville (BRO) (1)
4: Tampa (TBW), Melbourne (MLB) (2)
5: San Diego (SGX), Los Angeles/Oxnard (LOX), San Joaquin Valley/Hanford (HNX), Sacramento (STO), Medford (MFR), Portland OR (PQR), Seattle (SEW) (7)
8: SGX, Phoenix (PSR) (2)
10: LOX, SGX, PSR, Tucson (TWC), El Paso (EPZ), Midland/Odessa (MFR), San Angelo (SJT), Austin/San Antonio (EWX), Houston/Galveston (HGX), Lake Charles (LCH), New Orleans/Baton Rouge (LIX), Mobile (MOB), Tallahassee (TAE), Jacksonville (JAX) (14)
11: Las Vegas (VEF) (1 for now)
12: LIX (1)
14: Fort Worth/Dallas (FWD) (1)
15: SGX, VEF, Salt Lake City (SLC), Pocatello (PIH), Great Falls (TGX) (5)
16: Peachtree City/Atlanta (FFC), Charleston SC (CHS) (2)
17: PSR, Flagstaff (FGZ) (2)
19: TWC (1)
20: MAF, SJT, FWD, Shreveport (SHV), Jackson MS (JAN), Birmingham (BMX), FFC, Columbia SC (CAE), Wilmington NC (ILM) (9)
22: Memphis (MEG), BMX (2)
24: Paducah (PAH), Nashville (OHX), Morristown/Knoxville (MRX), FFC (4)
25: EPZ, Albuquerque (ABQ), Pueblo (PUB), Denver/Boulder (BOU), Cheyenne (CYS), Riverton (RIW) (6)
26: MRX, Greenville-Spartanburg (GSP), CAE, CHS (4)
27: Lubbock (LUB), Amarillo (AMA) (2)
29: Kansas City/Pleasant Hill (EAX), Omaha/Valley (OAX), Sioux Falls (FSD), Aberdeen (ABR), Grand Forks (FGF) (5)
30: FWD, SHV, Little Rock (LZK)
35: Corpus Christi (CPR), EWX, FWD, Norman/Oklahoma City (OUN), Wichita (ICT), Topeka (TOP), EAX, Des Moines (DMX), Chanhassen/Twin Cities (MPX), Duluth (DLH) (10)
37: CPR, EWX (2)
39: Lincoln IL (ILX), Chicago (LOT), Milwaukee/Sullivan (MKX), Green Bay (GRB)
40: VEF, FGZ, ABQ, AMA, OUN, Tulsa (TSA), LKZ, MEG, OHX, MRX, GSP, Raleigh (RAH), Newport/Morehead City (MHX), ILM (14)
41: MKX, GRB (2)
42: not yet signed (0 for now)
43: MKX, GRB (2)
44: OUN, TSA, Springfield MO (SGF), St. Louis (LSX)
45: HGX, FWD (2)
49: LCH, SHV, TSA, SGF, EAX (5 for now)
55: LIX, JAN, MEG, PAH, LSX, ILX, LOT (7)
57: PAH, LSX, ILX, LOT (4 for now)
59: LIX, JAN, BMX, Huntsville (HUN), FFC (5)
64: LSX, PAH, Louisville (LMK), Jackson KY (JKL), Charleston WV (RLX), Blacksburg/Roanoke (RNK), Baltimore/Washington (LWX), Wakefield VA (AKQ) (8)
65: MOB, BMX, HUN, OHX, LMK, Indianapolis (IND), Northern Indiana (IWX), LOT (8)
66: LWX (1)
68: Pittsburgh (PBZ), LWX (2)
69: BRO (69C and 69E only), CRP, HGX, MEG, PAH, IND, IWX, Grand Rapids (GRR), Detroit/Pontiac (DTX) (9 for now)
70: SLC, Grand Junction (GJT), BOU, Goodland (GLD), Dodge City (DDC), ICT, TOP, LSX, ILX, IND, Wilmington OH (ILN, de facto "Cincinnati/Wilmington"), PBZ, State College (CTP), LWX (14)
71: LMK, ILN, Cleveland (CLE) (3)
72: LSX, ILX (2)
73: RAH, RNK (2 for now)
74W: Quad Cities/Davenport (DVN), ILX, IND, ILN (4)
74E: RNK, RAH, ILM (3)
75: Miami (MFL), TBW, JAX, TAE, FFC, MRX, JKL, LMK, ILN, IWX, CLE, DTX, Gaylord (APX) (13)
76W: BOU, North Platte (LBF) (2)
76E: CLE, PBZ, CTP, Mount Holly/Philadelphia (PHI) (4)
77: CAE, GSP, RNK, RLX, PBZ, CLE (6)
78: CTP, PHI, New York/Upton (OKX) (3)
79: RLX, PBZ, CLE (3)
80: San Francisco Bay Area/Monterey (MTR), STO, Reno (REV), Elko (LKN), SLC, RIW, CYS, LBF, Hastings (GID), OAX, DMX, DVN, LOT, IWX, CLE, PBZ, CTP, Binghamton (BGM), PHI, OKX (20)
81: MRX, RNK, LWX, CTP, BGM, Buffalo (BUF) (6)
82: Pendleton (PDT) (1)
83: LWX, CTP (2)
84W: PQR, PDT, Boise (BOI), PIH, SLC (5)
84E: BGM, PHI (Eastbound only), OKX, Albany NY (ALY), Boston/Norton (BOX) (4.5)
85: BMX, FFC, GSP, RAH, AKQ (5)
86W: PIH (1)
86E: CLE, BUF, BGM (3 for now)
87S: RAH (1 for now)
87N: OKX, ALY, Burlington (BTV) (3)
88W: DVN, LOT (2)
88E: BGM, ALY (2)
89: Gray/Portland ME (GYX), BTV (2)
90: SEW, PDT, Spokane (OTX), Missoula (MSO), TFX, Billings (BYZ), RIW, Rapid City (UNR), ABR, FSD, MPX, La Crosse (ARX), MKX, LOT, IWX, CLE, BUF, BGM, ALY, BOX (20)
91: OKX, BOX, ALY, BTV (4)
93: BOX, GYX, BTV (3)
94: BYZ, Glasgow (GGW), Bismarck (BIS), FGF, MPX, ARX, MKX, LOT, IWX, GRR, DTX (11)
95: MFL, MLB, JAX, CHX, ILM, AKQ, LWX, PHI, OKX, BOX, GYX, Caribou (CAR) (12)
96: GRR, DTX (2)
97: LWX (1)
99: CTP, BGM (2)
A1: Anchorage (AFC) (1)
A2: AFC, Fairbanks (AFG) (2)
A3: AFC (1)
A4: AFC, AFG (2)
Interstates of Hawaii: Honolulu (HFO) (1 each)
Unsigned Interstates of Puerto Rico: San Juan (SFO) (1 each)

NWS county warning areas devoid of Interstates: Juneau (AJK), Eureka (EKA), Guam (GUM), Key West (KEY), Marquette (MQT). Prior to 2013 this applied to BRO as well.

[CNGL-Leudimin]

And here is the amount of Interstates, both 2di and 3di, in each NWS county warning area.
Albuquerque (ABQ): 25, 40 (2)
Aberdeen (ABR): 29, 90 (2)
Anchorage (AFC): A1, A2, A3, A4 (4)
Fairbanks (AFG): A2, A4 (2)
Juneau (AJK): none (0)
Wakefield VA (AKQ): 64, 95, 264, 295, 464, 564, 664 (7)
Albany NY (ALY): 84, 87, 88, 90, 91, 587, 787, 890 (8)
Amarillo (AMA): 27, 40 (2)
Gaylord (APX): 75 (1)
La Crosse (ARX): 90, 94 (2)
Binghamton (BGM): 80, 81, 84, 86, 88, 90, 380, 476, 481, 690 (10)
Bismarck (BIS): 94, 194 (2)
Birmingham (BMX): 20, 22, 59, 65, 85, 359, 459, 759 (8)
Boise (BOI): 84, 184 (2)
Denver/Boulder (BOU): 25, 70, 76, 225, 270 (5)
Boston/Norton (BOX): 90, 91, 93, 95, 190, 195, 290, 291 CT, 291 MA, 295, 384, 391, 395, 495, 691 (15)
Brownsville (BRO): 2, 69E, 69C, 169 (4)
Burlington (BTV): 87, 89, 91, 93, 189 (5)
Buffalo (BUF): 81, 90, 190, 290, 390, 490, 590, 781, 990 (9)
Billings (BYZ): 90, 94 (2)
Columbia SC (CAE): 20, 26, 77, 126, 520 (5)
Caribou (CAR): 95, 395 (2)
Charleston SC (CHS): 16, 26, 95, 516, 526 (5)
Cleveland (CLE): 71, 75, 77, 79, 80, 90, 271, 277, 280, 475, 480, 490, 680 (13)
Corpus Christi (CRP): 35, 37, 69E, 69W (4)
State College (CTP): 70, 76, 78, 80, 81, 83, 99, 180, 283 (9)
Cheyenne (CYS): 25, 80, 180 (2.5, 180 really shouldn't be an Interstate)
Dodge City (DDC): 70 (1)
Duluth (DLH): 35, 535 (2)
Des Moines (DMX): 35, 80, 235, 380 (4)
Detroit/Pontiac (DTX): 75, 94, 96, 275, 475, 675, 696 (7)
Quad Cities/Davenport (DVN): 74, 80, 88, 180, 280, 380 (6)
Kansas City/Pleasant Hill (EAX): 29, 35, 49, 70, 229, 435, 635, 670 (8)
Eureka (EKA): none (0)
El Paso (EPZ): 10, 25, 110 (3)
Austin/San Antonio (EWX): 10, 35, 37, 410 (4)
Peachtree City/Atlanta (FFC): 16, 20, 24, 59, 85, 185, 275, 285, 475, 575, 675, 985 (12)
Grand Forks (FGF): 29, 94 (2)
Sioux Falls (FSD): 29, 90, 129, 229 (4)
Fort Worth-Dallas (FWD): 14, 20, 30, 35, 35E, 35W, 45, 345, 635, 820 (10)
Glasgow (GGW): 94 (1)
Hastings (GID): 80 (1)
Grand Junction (GJT): 70 (1)
Goodland (GLD): 70 (1)
Green Bay (GRB): 39, 41, 43 (3)
Grand Rapids (GRR): 69, 94, 96, 194, 196, 296, 496 (7)
Greenville-Spartanburg (GSP): 26, 40, 77, 85, 185, 240, 385, 485, 585 (9)
Guam (GUM): none (0)
Gray/Portland ME (GYX): 89, 93, 95, 195, 293, 295, 393, 495 (8)
Honolulu (HFO): H1, H2, H3, H201 (4)
Houston/Galveston (HGX): 10, 45, 69, 610 (4)
San Joaquin Valley/Hanford (HNX): 5 (1)
Huntsville (HUN): 59, 65, 565 (3)
Wichita (ICT): 35, 70, 135, 235 (4)
Wilmington NC (ILM): 40, 74, 95, 140 (4)
Wilmington OH (ILN, de facto "Cincinnati/Wilmington"): 70, 71, 74, 75, 270, 275, 471, 670, 675 (9)
Lincoln IL (ILX): 39, 55, 57, 72, 74, 155, 474 (7)
Indianapolis (IND): 65, 69, 70, 74, 465, 865 (6)
Northern Indiana (IWX): 65, 69, 80, 90, 94, 469 (6)
Jackson MS (JAN): 20, 55, 59, 220 (4)
Jacksonville (JAX): 10, 75, 95, 295 (4)
Jackson KY (JKL): 64, 75 (2)
Key West (KEY): none (0)
North Platte (LBF): 76, 80 (2)
Lake Charles (LCH): 10, 49, 210 (3)
New Orleans/Baton Rouge (LIX): 10, 12, 55, 59, 110, 310, 510, 610, 910 (9)
Elko (LKN): 80 (1)
Louisville (LMK): 64, 65, 71, 165, 264, 265 (6, the 265s are considered one even if not continuously signed yet)
Los Angeles/Oxnard (LOX): 5, 10, 105, 110, 210, 405, 605, 710 (8)
St. Louis (LSX): 44, 55, 57, 64, 70, 72, 170, 172, 255, 270 (10) 
Lubbock (LUB): 27 (1)
Baltimore/Washington (LWX): 64, 66, 68, 70, 81, 83, 95, 97, (195 DC not yet signed), 195 MD, 270, 295, 366, 370, 395 DC/VA, 395 MD, 495, 595, 695 DC (to be taken down), 695 MD, 795, 895 (20)
Little Rock (LZK): 30, 40, 430, 440, 530, 630 (6)
Midland/Odessa (MAF): 10, 20 (2)
Memphis (MEG): 22, 40, 55, 69, 155, 240, 255, 269, 555 (9)
Miami (MFL): 75, 95, 195, 395, 595 (5)
Medford (MFR): 5 (1)
Newport/Morehead City (MHX): 40 (1)
Milwaukee/Sullivan (MKX): 39, 41, 43, 90, 94, 794, 894 (7, although 894 shouldn't count as it's redundant to 41)
Melbourne (MLB): 4, 95 (2)
Mobile (MOB): 10, 65, 110, 165 (4)
Chanhassen/Twin Cities (MPX): 35, 35E, 35W, 90, 94, 394, 494, 694 (8)
Marquette (MQT): none (0)
Morristown/Knoxville (MRX): 24, 26, 40, 75, 124, 381, 475, 640 (8)
Missoula (MSO): 90 (1)
San Francisco Bay Area/Monterey (MTR): 80, 205, 238, 280, 380, 580, 680, 880, 980 (9)
Omaha/Valley (OAX): 29, 80, 180, 480, 680, 880 (6)
Nashville (OHX): 24, 40, 65, 440, 840 (5)
New York/Upton (OKX): 78, 80, 87, 91, 95, 278, 280, 287, 295, 478, 495, 678, 695 (13)
Spokane (OTX): 90 (1)
Norman/Oklahoma City (OUN): 35, 40, 44, 235, 240 (5)
Paducah (PAH): 24, 55, 57, 64, 69, 165 (6)
Pittsburgh (PBZ): 68, 70, 77, 79, 279, 376, 470, 579 (8)
Mount Holly/Philadelphia (PHI): 76, 78, 80, 84 (Eastbound only), 95, 176, 195, 276, 280, 295, 476, 495, 676 (12.5)
Pocatello (PIH): 15, 84, 86 (3)
Portland OR (PQR): 5, 84, 105, 205 (4)
Phoenix (PSR): 8, 10, 17 (3)
Raleigh (RAH): 40, 73, 74, 85, 87, 95, 285, 440, 540, 785, 795, 840, (885 not yet signed) (12, soon to be 13)
Reno (REV): 80, 580 (2)
Riverton (RIW): 25, 80, 90 (3)
Charleston WV (RLX): 64, 77, 79 (3)
Blacksburg/Roanoke (RNK): 64, 73, 74, 77, 81, 581 (6)
Seattle (SEW): 5, 90, 405, 705 (4)
Springfield MO (SGF): 44, 49 (2)
San Diego (SGX): 5, 10, 15, 405, 605, 805 (6)
Shreveport (SHV): 20, 30, 49, 220, 369 (5)
San Angelo (SJT): 10, 20 (2)
San Juan (SJU): PRI1, PRI2, PRI3 (3)
Salt Lake City (SLC): 15, 70, 80, 84, 215 (5)
Sacramento (STO): 5, 80, 205, 305, 505, 680, 780 (7)
Tallahassee (TAE): 10, 75 (2)
Tampa (TBW): 4, 75, 175, 275, 375 (5)
Great Falls (TFX): 15, 90, 115, 315 (4)
Topeka (TOP): 35, 70, 335, 470 (4)
Tulsa (TSA): 40, 44, 49, 244, 444, 540 (6)
Tucson (TWC): 10, 17, 19 (3)
Rapid City (UNR): 90, 190 (2)
Las Vegas (VEF): 11, 15, 40, 215, 515 (5)

[hotdogPi]

In the 122 States of America plan, one of the 291s will have to be renumbered.

[CtrlAltDel]

Inspired by the "Which Interstate goes through the most area codes?", I figured out I should combine roads and weather, and see which ones crosses the most NWS county warning areas.

I'm beginning to think we've run out of things to talk about. 

[I-55]

And here is the amount of Interstates, both 2di and 3di, in each NWS county warning area.
Albuquerque (ABQ): 25, 40 (2)
Aberdeen (ABR): 29, 90 (2)
Anchorage (AFC): A1, A2, A3, A4 (4)
Fairbanks (AFG): A2, A4 (2)
Juneau (AJK): none (0)
Wakefield VA (AKQ): 64, 95, 264, 295, 464, 564, 664 (7)
Albany NY (ALY): 84, 87, 88, 90, 91, 587, 787, 890 (8)
Amarillo (AMA): 27, 40 (2)
Gaylord (APX): 75 (1)
La Crosse (ARX): 90, 94 (2)
Binghamton (BGM): 80, 81, 84, 86, 88, 90, 380, 476, 481, 690 (10)
Bismarck (BIS): 94, 194 (2)
Birmingham (BMX): 20, 22, 59, 65, 85, 359, 759 (7)
Boise (BOI): 84, 184 (2)
Denver/Boulder (BOU): 25, 70, 76, 225, 270 (5)
Boston/Norton (BOX): 90, 91, 93, 95, 190, 195, 290, 291 CT, 291 MA, 295, 384, 391, 395, 495, 691 (15)
Brownsville (BRO): 2, 69E, 69C, 169 (4)
Burlington (BTV): 87, 89, 91, 93, 189 (5)
Buffalo (BUF): 81, 90, 190, 290, 390, 490, 590, 781, 990 (9)
Billings (BYZ): 90, 94 (2)
Columbia SC (CAE): 20, 26, 77, 126, 520 (5)
Caribou (CAR): 95, 395 (2)
Charleston SC (CHS): 16, 26, 95, 516, 526 (5)
Cleveland (CLE): 71, 75, 77, 79, 80, 90, 271, 277, 280, 475, 480, 490, 680 (13)
Corpus Christi (CRP): 35, 37, 69E, 69W (4)
State College (CTP): 70, 76, 78, 80, 81, 83, 99, 180, 283 (9)
Cheyenne (CYS): 25, 80, 180 (2.5, 180 really shouldn't be an Interstate)
Dodge City (DDC): 70 (1)
Duluth (DLH): 35, 535 (2)
Des Moines (DMX): 35, 80, 235, 380 (4)
Detroit/Pontiac (DTX): 75, 94, 96, 275, 475, 675, 696 (7)
Quad Cities/Davenport (DVN): 74, 80, 88, 180, 280, 380 (6)
Kansas City/Pleasant Hill (EAX): 29, 35, 49, 70, 229, 435, 635, 670 (8)
Eureka (EKA): none (0)
El Paso (EPZ): 10, 25, 110 (3)
Austin/San Antonio (EWX): 10, 35, 37, 410 (4)
Peachtree City/Atlanta (FFC): 16, 20, 24, 59, 85, 185,  285, 475, 575, 675, 985 (11)
Grand Forks (FGF): 29, 94 (2)
Sioux Falls (FSD): 29, 90, 129, 229 (4)
Fort Worth-Dallas (FWD): 14, 20, 30, 35, 35E, 35W, 45, 345, 635, 820 (10)
Glasgow (GGW): 94 (1)
Hastings (GID): 80 (1)
Grand Junction (GJT): 70 (1)
Goodland (GLD): 70 (1)
Green Bay (GRB): 39, 41, 43 (3)
Grand Rapids (GRR): 69, 94, 96, 194, 196, 296, 496 (7)
Greenville-Spartanburg (GSP): 26, 40, 77, 85, 185, 240, 285, 385, 485, 585 (9)
Guam (GUM): none (0)
Gray/Portland ME (GYX): 89, 93, 95, 195, 293, 295, 393, 495 (8)
Honolulu (HFO): H1, H2, H3, H201 (4)
Houston/Galveston (HGX): 10, 45, 69, 610 (4)
San Joaquin Valley/Hanford (HNX): 5 (1)
Huntsville (HUN): 59, 65, 565 (3)
Wichita (ICT): 35, 70, 135, 235 (4)
Wilmington NC (ILM): 40, 74, 95, 140 (4)
Wilmington OH (ILN, de facto "Cincinnati/Wilmington"): 70, 71, 74, 75, 270, 275, 471, 670, 675 (9)
Lincoln IL (ILX): 39, 55, 57, 72, 74, 155, 474 (7)
Indianapolis (IND): 65, 69, 70, 74, 465, 865 (6)
Northern Indiana (IWX): 65, 69, 80, 90, 94, 469 (6)
Jackson MS (JAN): 20, 55, 59, 220 (4)
Jacksonville (JAX): 10, 75, 95, 295 (4)
Jackson KY (JKL): 64, 75 (2)
Key West (KEY): none (0)
North Platte (LBF): 76, 80 (2)
Lake Charles (LCH): 10, 49, 210 (3)
New Orleans/Baton Rouge (LIX): 10, 12, 55, 59, 110, 310, 510, 610, 910 (9)
Elko (LKN): 80 (1)
Louisville (LMK): 64, 65, 71, 165, 264, 265 (6, the 265s are considered one even if not continuously signed yet)
Los Angeles/Oxnard (LOX): 5, 10, 105, 110, 210, 405, 605, 710 (8)
Lubbock (LUB): 27 (1)
Baltimore/Washington (LWX): 64, 66, 68, 70, 81, 83, 95, 97, (195 DC not yet signed), 195 MD, 270, 295, 366, 370, 395 DC/VA, 395 MD, 495, 595, 695, 795, 895 (19, soon to be 20)
Little Rock (LZK): 30, 40, 430, 440, 530, 630 (6)
Midland/Odessa (MAF): 10, 20 (2)
Memphis (MEG): 22, 40, 55, 69, 155, 240, 269, 555 (8)
Miami (MFL): 75, 95, 195, 395, 595 (5)
Medford (MFR): 5 (1)
Newport/Morehead City (MHX): 40 (1)
Milwaukee/Sullivan (MKX): 39, 41, 43, 90, 94, 794, 894 (7, although 894 shouldn't count as it's redundant to 41)
Melbourne (MLB): 4, 95 (2)
Mobile (MOB): 10, 65, 110, 165 (4)
Chanhassen/Twin Cities (MPX): 35, 35E, 35W, 90, 94, 394, 494, 694 (8)
Marquette (MQT): none (0)
Morristown/Knoxville (MRX): 24, 26, 40, 75, 124, 381, 475, 640 (8)
Missoula (MSO): 90 (1)
San Francisco Bay Area/Monterey (MTR): 80, 205, 238, 280, 380, 580, 680, 880, 980 (9)
Omaha/Valley (OAX): 29, 80, 180, 480, 680, 880 (6)
Nashville (OHX): 24, 40, 65, 440, 840 (5)
New York/Upton (OKX): 78, 80, 87, 91, 95, 278, 280, 287, 295, 478, 495, 678, 695 (13)
Spokane (OTX): 90 (1)
Norman/Oklahoma City (OUN): 35, 40, 44, 235, 240 (5)
Pittsburgh (PBZ): 68, 70, 77, 79, 279, 376, 470, 579 (8)
Mount Holly/Philadelphia (PHI): 76, 78, 80, 84 (Eastbound only), 95, 176, 195, 276, 280, 295, 476, 495, 676 (12.5)
Pocatello (PIH): 15, 84, 86 (3)
Portland OR (PQR): 5, 84, 105, 205 (4)
Phoenix (PSR): 8, 10, 17 (3)
Raleigh (RAH): 40, 73, 74, 85, 87, 95, 285, 440, 540, 785, 840 (11)
Reno (REV): 80, 580 (2)
Riverton (RIW): 25, 80, 90 (3)
Charleston WV (RLX): 64, 77, 79 (3)
Blacksburg/Roanoke (RNK): 64, 73, 74, 77, 81, 581 (6)
St Louis (LSX): 44, 55, 57, 64, 70, 72, 170, 172, 255, 270 (10)
Seattle (SEW): 5, 90, 405, 705 (4)
Springfield MO (SGF): 44, 49 (2)
San Diego (SGX): 5, 10, 15, 405, 605, 805 (6)
Shreveport (SHV): 20, 30, 49, 220, 369 (5)
San Angelo (SJT): 10, 20 (2)
San Juan (SJU): PRI1, PRI2, PRI3 (3)
Salt Lake City (SLC): 15, 70, 80, 84, 215 (5)
Sacramento (STO): 5, 80, 205, 305, 505, 680, 780 (7)
Tallahassee (TAE): 10, 75 (2)
Tampa (TBW): 4, 75, 175, 275, 375 (5)
Great Falls (TFX): 15, 90, 115, 315 (4)
Topeka (TOP): 35, 70, 335, 470 (4)
Tulsa (TSA): 40, 44, 49, 244, 444, 540 (6)
Tucson: 10, 17, 19 (3)
Rapid City (UNR): 90, 190
Las Vegas (VEF): 11, 15, 40, 215, 515 (5)

Added/fixed a few things

[Crown Victoria]

Inspired by the "Which Interstate goes through the most area codes?", I figured out I should combine roads and weather, and see which ones crosses the most NWS county warning areas.

I'm beginning to think we've run out of things to talk about. 

We still haven't done zip codes... 

[ran4sh]

How did the Atlanta area get the code FFC ...

[US 89]

How did the Atlanta area get the code FFC ...

FFC is the airport code for Atlanta Regional Airport down in Peachtree City, where the actual NWS office is physically located. I would imagine the code is probably derived at least in part from the original name of Falcon Field.

[CNGL-Leudimin]

There's also North Platte, which is LBF (the IATA code for its regional airport, also known as Lee Bird Field). Neighboring Hastings is GID, which screams "Grand Island".

In the 122 States of America plan, one of the 291s will have to be renumbered.

And one of the 195s and 395s in the Baltimore/Washington area.

Added/fixed a few things

Thanks. I did this very late at night (I ended at 1 am CET!), so I was bound to unconsciously omit some (including two entire county warning areas). I've added a few others I missed as well, such as I-795 in North Carolina.

I'm beginning to think we've run out of things to talk about. 

We still haven't done zip codes... 

If your guys want, level III ecoregions as defined by the EPA will be next . I would have to omit the four interstates of Oahu, since Hawaii doesn't have any defined ecoregions.

[hobsini2]

CNGL, being a weather geek too, I'm glad someone did this. And you have inspired something I am going to work on and put into the weather section. Stay tuned.

[ran4sh]

Another thread should be which Interstates go through the most Census Regions and Census Divisions, (I think I-70 is the only one that goes through all 4 Census Regions), Federal Reserve Districts, etc