ARKANSAS · PULASKI COUNTY
Where the Arkansas River bends through Dixie Alley wind design
Little Rock sits in the heart of central Arkansas, straddling the Arkansas River at the seam of Dixie Alley. Its spring storm season — not any coast — is what sets the design wind speed on every roof, wall, and frame in Pulaski County.
CENTRAL ARKANSAS CLIMATE
A river-valley capital shaped by convective spring storms
Hundreds of miles from any coast, Little Rock never carries hurricane loads. Its 105–115 mph map value is driven by the violent collision of Gulf moisture and continental air over central Arkansas.
Dixie Alley tornado exposure
Pulaski County sits in the Dixie Alley corridor, where long-track tornadoes strike from March into early summer.
SEVEREDerecho straight-line winds
Organized squall lines push damaging gusts across the metro, independent of any rotating storm.
CONVECTIVELarge-hail roof demand
Central Arkansas logs frequent severe hail, so roofs must resist uplift and impact in the same assembly.
ROOF SYSTEMSArkansas River channeling
The river valley can funnel and accelerate gusts, lifting local exposure along the corridor.
VALLEY EFFECTASCE 7-22 tornado note: The 2022 edition added Chapter 32 tornado-load provisions for higher risk categories. Most standard Little Rock occupancies are still governed by the synoptic basic wind speed map — but the Dixie Alley climate is exactly what keeps that mapped value in the 105–115 mph band rather than a lower inland number.
TERRAIN CALL
Reading exposure across the Little Rock river metro
The capital splits into two terrain pictures: dense, tree-shrouded older neighborhoods and the open, fast-growing suburban edge. Choose wrong and every pressure on the page is off.
Exposure B — established Little Rock
Downtown, the Heights and Hillcrest sit inside dense, sheltering build-out with mature tree cover. The default for most permits in the urban core.
URBAN / SUBURBANExposure C — the open suburban edge
West Little Rock, Maumelle, Jacksonville and Sherwood growth tracts read as open terrain mid-build, raising pressures until surroundings fill in.
OPEN TERRAINWhere the line moves: Little Rock's expanding western and northern suburbs make the B-to-C boundary a judgment call. Where upwind build-out is incomplete — or along the open Arkansas River corridor — the more conservative Exposure C governs.
RISK & RETURN PERIOD
How occupancy raises Little Rock's mapped wind speed
ASCE 7-22 carries no wind importance factor. A higher risk category instead reads a longer-return-period map, so essential Pulaski County facilities design to a stiffer gust than homes do.
| Risk Category | Little Rock Mapped Gust | Representative Buildings |
|---|---|---|
| I · 300-yr map | ~100–105 mph | Minor agricultural, temporary and storage structures |
| II · 700-yr map | 105–115 mph | Homes, retail, offices and most standard occupancies |
| III · 1,700-yr map | ~120–125 mph | Schools, large assembly, substantial-hazard occupancies |
| IV · 3,000-yr map | ~125–135 mph | Hospitals, fire stations, shelters and emergency centers |
PERMIT PATHWAY
Clearing a wind-load review inside Pulaski County
Arkansas enforces the statewide Fire Prevention Code, which adopts the IBC and references ASCE 7. These are the six pieces a Little Rock submittal turns on.
Arkansas Fire Prevention Code
The statewide code adopts the IBC with Arkansas amendments and references ASCE 7-22 for wind loads.
CODE BASISMapped basic wind speed
Pull V from the ASCE 7-22 map for the site: 105–115 mph for ordinary Little Rock occupancies.
V = 105–115Exposure determination
Justify B for the sheltered urban core or C for the open suburban edge from upwind terrain.
B OR CRisk category check
Confirm occupancy class so the correct return-period map and gust apply to the design.
TABLE 1.5-1City of Little Rock review
Planning & Development permits work inside the city; Pulaski County covers unincorporated tracts.
JURISDICTIONPE-sealed calculations
Commercial and complex Little Rock projects need calcs sealed by an Arkansas-licensed Professional Engineer.
ARKANSAS PEOfficial Little Rock references: City of Little Rock Planning & Development · Arkansas Building Authority Division · Arkansas PE Licensing Board
ACROSS ARKANSAS
Little Rock against the rest of the state's storm map
Central Arkansas carries some of the highest base winds in the state. Here is how the capital lines up with other Arkansas markets.
| City | Design Gust · Risk II | Primary Hazard |
|---|---|---|
| Little Rock | 105–115 mph | Dixie Alley tornadoes, severe thunderstorms |
| Fort Smith | 105–115 mph | Western Arkansas severe storms |
| Fayetteville | 100–110 mph | Northwest highlands, moderate storm risk |
| Jonesboro | 105–115 mph | Northeast delta, Mississippi River valley |
BEYOND THE CAPITAL
Carry these loads to the wider Arkansas map
Wind speeds hold steady across the Little Rock metro, but exposure shifts fast in the growth corridors. Branch out from the capital to the statewide and tornado resources.
Arkansas statewide requirements
The full Arkansas wind-load picture, from the delta to the Ozark highlands.
STATE HUBTornado Alley wind safety
How tornado-prone regions like central Arkansas approach wind-load design and shelters.
HAZARDWind speed by location
Look up the mapped basic wind speed for any U.S. address or ZIP.
LOOKUPAll state requirements
Compare adopted codes and ASCE 7 editions across every U.S. state.
DIRECTORYFINISH THE LITTLE ROCK CALC
Turn the central Arkansas wind map into a sealed permit set
Enter a Little Rock address and the calculator applies the 105–115 mph gust, sorts Exposure B or C, runs the risk category, and returns MWFRS and C&C pressures ready for Pulaski County review.