MINNESOTA · HENNEPIN COUNTY
Where the Mississippi Meets the Cold-Climate Wind Code
Minneapolis anchors the Twin Cities on the upper Mississippi, where continental-climate extremes, summer derechos, and tornado season shape every wind load review under the Minnesota State Building Code.
UPPER MISSISSIPPI · WIND CLIMATE
Reading the Twin Cities Wind Map
A continental interior site: moderate basic wind speeds, but real hazard from straight-line storm winds, tornado season, and wind acting on snow- and ice-loaded roofs.
Basic Wind Speed
Risk Category II design speeds run 105–115 mph, with the lower end inside the dense urban core and the upper end on exposed metro edges.
105–115 MPHExposure B vs C
Downtown, Uptown and Northeast neighborhoods read Exposure B; lake frontage, the river corridor, and prairie-edge sites push toward Exposure C.
B / C SITE-SPECIFICStorm-Season Winds
Summer thunderstorm and derecho gusts regularly reach 70–90 mph and occasionally top 100 mph, the scenarios component-and-cladding design must respect.
DERECHO RISKCold + Snow Coupling
Arctic outbreaks below -30°F and a 40–50 psf ground-snow regime mean wind rarely acts alone — combined load cases drive the controlling demand.
COMBINED CASESVelocity pressure follows ASCE 7-22 as adopted by the MSBC: qz = 0.00256 Kz Kzt Kd Ke V². On flat Twin Cities terrain (Kzt = 1.0) at low roof heights, Exposure B uses Kz = 0.70 with Kd = 0.85 for buildings — moving the same site to Exposure C raises Kz to 0.85 at low height, a roughly 21% jump in pressure before any storm refinement.
PERMIT PATH · HENNEPIN COUNTY
What a Minneapolis Submittal Has to Settle
Six checkpoints that decide whether a wind load package clears CPED or Hennepin County review the first time.
Risk Category
Classify per ASCE 7-22 Table 1.5-1; higher categories pull V from a longer-return-period map, not a fixed multiplier.
7-22 TBL 1.5-1Exposure Call
Run a 360° terrain sweep within 800–1500 ft; lake fetch and prairie edge can flip a site from B to C.
§ 26.7Snow + Wind Cases
Evaluate wind on snow-loaded roofs, drift at parapets and steps, and rain-on-snow per the combined-load rules.
40–50 PSF GROUNDC&C Pressures
Detail glazing, doors, roof panels and cladding for debris from straight-line and tornadic winds.
COMPONENT & CLADDINGCold-Toughness
Account for reduced ductility and brittle-fracture risk in welded connections through deep-winter lows.
CHARPY V-NOTCHPE Seal
Commercial, assembly and public projects need calculations sealed by a Minnesota-licensed Professional Engineer.
MN PE| Risk Category | Minneapolis Design Speed | Representative Buildings |
|---|---|---|
| I | ~100–105 mph | Agricultural, temporary, minor storage |
| II | 105–115 mph | Homes, retail, most standard occupancies |
| III | ~120–130 mph | Schools, assembly >300, substantial hazard |
| IV | ~130–140 mph | Hospitals, fire stations, shelters, EOCs |
OFFICIAL SOURCES · MINNESOTA
Verify It at the Source Desks
The jurisdictions and boards that administer Minneapolis and Hennepin County wind load compliance.
Minneapolis CPED Permits
City building permits and plan review for properties inside Minneapolis limits.
CITY DESKHennepin County Permits
County permitting and inspections for unincorporated and select suburban areas.
COUNTY DESKMinnesota State Building Code
The MSBC construction codes that adopt the IBC and reference ASCE 7.
MSBCMinnesota PE Board
AELSLAGID — the board administering Professional Engineer licensure in Minnesota.
MN PEREGIONAL CONTEXT · MINNESOTA & BEYOND
How Minneapolis Sits Among Upper Midwest Peers
Comparable continental-interior speeds, with each city tuned to its own terrain and state code.
| City | Design Wind Speed | Exposure | Building Code |
|---|---|---|---|
| Minneapolis, MN | 105–115 mph | B (urban), C (open) | Minnesota State Building Code |
| St. Paul, MN | 105–115 mph | B (urban), C (open) | Minnesota State Building Code |
| Milwaukee, WI | 105–110 mph | B (urban), C (lakefront) | Wisconsin Commercial Building Code |
| Des Moines, IA | 110–120 mph | B typical | Iowa State Building Code (IBC) |
| Fargo, ND | 110–120 mph | B/C typical | North Dakota State Building Code |
RUN THE NUMBERS
Calculate Minneapolis Wind Loads in Minutes
Enter a Twin Cities address or zip code and get ASCE 7-22 velocity pressures, Exposure B/C handling, Risk Category speeds, and PE-ready MWFRS and C&C output for CPED or Hennepin County submittal.