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NOAA/NWS STORM PREDICTION CENTER REPORTS + U.S. CENSUS DATA

Hail, Wind & Tornado Reports in and near Rock Valley, IA

Public hail, wind, and tornado reports in and near Rock Valley, IA from August 22, 1973 through June 17, 2026, sourced from NOAA/NWS Local Storm Reports and SPC storm report data.

Example: 55401 — search hail, wind and tornado public reports for any U.S. ZIP code 
Hail Reports
53
Wind Reports
29
Tornado Reports
6
Max Hail Size
2.75″
Source  NOAA SPC · NWS Local Storm Reports Coverage  Rock Valley, IA · 1973–present Updated  Daily · last Jun 17, 2026

Latest NWS Hail Reports in and near Rock Valley, IA

30 reports
Free hail report for your home →
1.00″ hail
Jun 2, 2025
9:16 PM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: Report from mPING: Quarter (1.00 in.).
NWS Hail Report Location: 7 S Rock Valley, IA
1.00″ hail
Apr 20, 2023
2:14 AM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: Rock Valley, IA
2.50″ hail
Aug 18, 2022
10:44 PM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: REPORT FROM MPING: TENNIS BALL (2.50 IN.).
NWS Hail Report Location: 8 SSW Rock Valley, IA
1.75″ hail
Aug 18, 2022
10:42 PM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 8 SSW Rock Valley, IA
1.00″ hail
Aug 27, 2021
6:05 AM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: SPOTTER REPORTS HEAVY RAIN... GREEN SNAPPED CORN... DEAD BIRDS... HOLES IN SIDING AND APPROXIMATELY QUARTER SIZED HAIL.
NWS Hail Report Location: 3 S Rock Valley, IA
1.00″ hail
Aug 28, 2018
9:36 AM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: THE DURATION OF THE HAIL EVENT WAS 4 MINUTES.
NWS Hail Report Location: Rock Valley, IA
1.25″ hail
Aug 7, 2018
7:40 AM UTC
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 5 SSW Inwood, IA
0.88″ hail
May 10, 2015
2:31 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 2.87 WNW Fairview, IA
1.00″ hail
Sep 19, 2014
8:55 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 3.6 NNW Lebanon, IA
1.25″ hail
Jun 16, 2014
12:30 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: Large hail was accompanied by damaging thunderstorm winds.
NWS Hail Report Location: N Rock Vly, IA
1.00″ hail
Jun 5, 2014
3:45 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 3.32 ENE Fairview, IA
1.00″ hail
May 4, 2012
8:45 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 2.44 NW Perkins, IA
1.25″ hail
May 4, 2012
8:36 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: N Rock Vly, IA
1.50″ hail
May 1, 2012
6:22 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: 1.47 NNW Fairview, IA
1.00″ hail
Sep 22, 2010
2:14 PM CST-6
Hail report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Hail Report Description: No National Weather Service description provided.
NWS Hail Report Location: N Rock Vly, IA
Showing 15 of 30
Hail Damage Risk for Your Home +

Hail reports describe hail by diameter, often comparing stone size to familiar objects like peas, quarters, golf balls, and softballs. Use this guide as a starting point for possible hail damage to your roof, siding, gutters, vents, windows, and exterior. Actual hail damage depends on hail hardness, density, wind speed, impact angle, roof age, shingle condition, roof pitch, roofing material, installation quality, and prior storm damage.

Pea
0.25″
Low

Usually too small to cause hail damage to most sound asphalt roofs, siding, or gutters.

Mothball
0.50″
Sub-Severe Watch

Below the NWS severe-hail threshold, but not always harmless. Repeated small hail can scuff surfaces, wear aging shingles, and loosen protective granules over time.

Penny
0.75″
Minor / Watch

Below the NWS severe-hail threshold, but roof hail damage is still possible on older, brittle, poorly installed, or previously damaged shingles. May also mark screens, vents, gutters, and soft metal.

Nickel
0.88″
Minor / Watch

Still below the severe-hail threshold, but large enough to leave visible marks on soft metal and add wear to older or hail-weakened roof shingles.

Quarter
1.00″
Watch

The NWS severe-hail threshold. Quarter-size hail can bruise shingles, dent soft metal, and create roof hail damage worth checking.

Half Dollar
1.25″
Watch

More likely to dent gutters, vents, flashing, and siding. Hail damage risk rises quickly on older roofs or hail-weakened shingles.

Ping Pong / Walnut
1.50″
Likely

Hail damage becomes more likely, including bruised shingles, granule loss, dented siding, and damaged roof vents.

Golf Ball
1.75″
Likely

Often causes roof hail damage, cracked shingles, dented gutters, damaged flashing, and siding impacts. A roof inspection is recommended.

Hen Egg
2.00″
Serious

Can crack or puncture shingles, expose mat, dent siding, and cause widespread hail damage across the roof and exterior.

Tennis Ball
2.50″
Serious

Can cause heavy roof hail damage, punctured siding, broken skylights, damaged vents, and widespread exterior damage.

Baseball
2.75″
Major

Major hail damage is likely, including severe roof impacts, damaged siding, broken windows, and possible major roof repairs.

Tea Cup / Large Apple
3.00″
Major

Can cause heavy hail damage across the roof, siding, gutters, windows, and exterior. Significant repairs are often needed.

Softball
4.00″
Extreme

Destructive hail damage. Can severely damage roofing materials, siding, windows, gutters, vents, vehicles, and exterior surfaces.

Grapefruit
4.50″
Extreme

Catastrophic hail damage risk for roofs, windows, vehicles, siding, gutters, and exterior surfaces.

Source: NOAA / National Weather Service hail size references are used for hail-size comparisons and the 1.00″ severe-hail threshold. Damage descriptions are general homeowner guidance, not official NOAA/NWS damage ratings. Sub-severe hail under 1.00″ is below the severe threshold, but that does not mean “no roof damage.” Penny- to nickel-size hail can still contribute to granule loss, cosmetic surface marks, and added wear, especially on older, brittle, poorly installed, or previously damaged roofs.

Latest NWS Wind Reports in and near Rock Valley, IA

29 reports
Free hail report + wind check →
UNK mph
Jun 17, 2026
10:25 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: tree limbs down up to 5 1/2 inch in diameter.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jul 15, 2024
10:25 AM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: A few large branches down.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jul 12, 2023
9:47 AM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: Power lines and large branches down. Winds lasted for 5 minutes.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jul 10, 2023
9:42 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: Multiple 3-4 inch tree limbs downed.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jun 26, 2023
10:49 AM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: Report from mPING: 3-inch tree limbs broken.
NWS Wind Report Location: 1 E Rock Valley, IA
UNK mph
Jun 26, 2023
9:52 AM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: Photos of multiple large tree limbs broken via social media. Time estimated from radar.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Oct 24, 2022
12:25 AM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
NWS Wind Report Location: Rock Valley, IA
UNK mph
May 12, 2022
11:13 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: REPORT FROM MPING: HOMES/BUILDINGS COMPLETELY DESTROYED.
NWS Wind Report Location: 3 SW Rock Valley, IA
UNK mph
May 12, 2022
10:05 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: ENTIRE ROOF AND ALL WALLS BLOWN OFF OF HOG BARN... WITH DEBRIS SCATTERED FOR AT LEAST 3/4 OF A MILE DOWNSTREAM.
NWS Wind Report Location: 3 SW Rock Valley, IA
58 mph
Oct 11, 2020
11:14 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: PERSONAL WEATHER STATION MEASURED WIND GUST.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jun 21, 2020
8:48 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: 6 TO 9 INCH DIAMETER TREE BRANCH DOWN... POWER OUTAGES IN ROCK VALLEY.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jul 20, 2019
2:06 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: FOUR INCH DIAMETER TREE BRANCH DOWN.
NWS Wind Report Location: Rock Valley, IA
UNK mph
Jul 17, 2019
12:06 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: MACHINE SHED DOORS BLOWN IN... AND BACKWALL BLOWN OUT WITH DEBRIS GOING OUT INTO THE FIELD.
NWS Wind Report Location: 7 SW Rock Valley, IA
UNK mph
Jul 17, 2019
12:05 PM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: 3 POWERLINE POLES BLOWN OVER.
NWS Wind Report Location: 8 SW Rock Valley, IA
UNK mph
Jul 4, 2019
7:45 AM UTC
Wind report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Wind Report Description: ROOF AND MOST WALLS REMOVED FROM HOUSE AT CORNER OF 8TH AVE. AND 12TH ST. DEBRIS DAMAGED DOWNSTREAM HOME TO EAST. UTILITY POLE AND SEVERAL TREES SNAPPED... STARTING A SMALL FIRE. SEVERAL OTHER HOMES HAD SOME ROOF OR SIDING DAMAGE. DAMAGE WAS CONCENTRATED IN A FOUR BLOCK AREA... FROM 1 BLOCK WEST TO 2 BLOCKS EAST-SOUTHEAST OF THIS POINT.
NWS Wind Report Location: 1 WSW Rock Valley, IA
Showing 15 of 29
Wind Damage Risk for Your Home +

Storm reports list thunderstorm wind gusts in mph. The NWS marks storms as severe at 58+ mph, but wind damage to your home depends on roof age, shingle condition, installation, exposure, nearby trees, and prior hail or wind damage.

Below Severe
Under 58 mph
Minor

Usually little damage to a sound roof, but loose shingles, flashing, or debris may shift.

Severe
58–74 mph
Watch

Can loosen shingles, lift flashing, break limbs, and damage gutters, siding, fences, or trim.

Damaging
75–90 mph
Serious

Can peel shingles, damage vents, tear siding, rip gutters, and expose weak roof areas.

Extreme
90+ mph
Major

Can cause major roof covering loss, tree damage, broken windows, and structural damage.

Source: NOAA / National Weather Service storm reports. Gusts may be measured or estimated; actual wind damage varies by roof condition, exposure, and prior hail or wind damage.

Latest NWS Tornado Reports in and near Rock Valley, IA

6 reports
EF0 category
May 10, 2015
2:28 PM CST-6
Tornado report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Tornado Report Description: A tornado observed over open fields caused no reported damage.
NWS Tornado Report Location: 2.01 E Fairview, IA
EF2 category
May 1, 2008
5:59 PM CST-6
Tornado report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Tornado Report Description: A tornado damaged numerous trees, including large trees uprooted, blew windows out of a home, destroyed a metal shed, blew two windows and part of a wall out of a metal building, damaged at least three grain bins, destroyed or damaged numerous outbuildings and small sheds, blew down or snapped off at least 15 power poles, bent a metal light pole, tipped one wagon and blew the top off another, blew down a barb wire fence and pushed fence posts almost to the ground, destroyed a hog barn, and flattened corn stubble, before crossing the county line into Lyon County. Contents inside several damaged or destroyed buildings and sheds were also damaged, especially on one farm where damaged buildings housed a farm and trucking business.
NWS Tornado Report Location: 4 S Rock Vly, IA
EF0 category
Sep 30, 2007
3:27 PM CST-6
Tornado report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Tornado Report Description: A brief tornado caused no reported damage.
NWS Tornado Report Location: 5 SW Rock Vly, IA
F0 category
Apr 18, 2004
4:15 PM CST
Tornado report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Tornado Report Description: A brief tornado caused no reported damage.
NWS Tornado Report Location: 9 W Rock Vly, IA
F0 category
May 15, 1998
10:30 AM CST
Tornado report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: 7 SW Rock Vly, IA
UNK category
Jul 5, 1978
5:30 PM CST
Tornado report for Rock Valley, IA
Sioux County · 10,595 Homes in County
Tornado Report Description: No National Weather Service description provided.
NWS Tornado Report Location: Not provided, IA
Showing 6 of 6
Tornado Damage Risk for Your Home +

After a tornado, the National Weather Service assigns an EF rating from EF0 to EF5 based on surveyed damage. The rating estimates wind speed from what the tornado damaged, so actual damage can vary by construction quality, roof age, garage doors, windows, trees, debris, and how close the home was to the tornado path.

EF0
65–85 mph
Light

Can peel shingles, damage gutters or siding, break tree limbs, and toss loose outdoor items.

EF1
86–110 mph
Moderate

Can strip roof covering, damage exterior doors, break windows, snap trees, and cause heavier siding or gutter damage.

EF2
111–135 mph
Serious

Can tear off large sections of roofing, break or uproot trees, destroy weaker structures, and cause major exterior damage.

EF3–EF5
136+ mph
Severe

Can remove roofs and walls, destroy large portions of homes, toss vehicles, and cause severe to total destruction near the path.

Source: NOAA / National Weather Service. EF ratings are assigned after a post-storm damage survey and are based on observed damage, not a direct measurement at every home.

NWS Hail, Wind and Tornado Reports in and near Rock Valley, IA on the Interactive Map

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Browse ZIP Codes with NWS Storm Reports in Rock Valley

51247 82
Rock Valley, IA Hail, wind & tornado reports

NWS Storm Reports & Census Data

U.S. Census Data · City

Rock Valley, IA area census snapshot

People & households
Population4,061
Households1,595
Housing units1,610
Income
Median household income$67,012
$100k+ households36.6%
$150k+ households11.2%
Housing stock
Single-family detached1,176
Attached single-family84
Small multifamily187
Large multifamily163
Mobile homes0
Housing mix
Single-family share73.0%
Attached-home share5.2%
Multifamily share21.7%
Mobile-home share--
Ownership & occupancy
Owner-occupied999
Renter-occupied596
Vacant units15
Home value & age
Median home value$225,800
Owner homes $300k+20.2%
Owner homes $500k+4.4%
Owner homes $750k+2.6%
Median year built1975
Older-home share53.5%
Vehicle context
Households with cars1,449
Free hail maps

This snapshot is for local area context only and describes the selected state, county, city, or ZIP area — not a specific home or property. For ZIP-level estimated hail impact, use Free Hail Maps to generate a hail report with key impact details for that ZIP.

Frequently asked questions

for homeowners, buyers & sellers
How many hail, wind, and tornado reports does Rock Valley have on record?

Our records show 53 hail, 29 wind, and 6 tornado reports in and near Rock Valley, IA, compiled from NOAA SPC and NWS Local Storm Reports. The most recent was reported on June 17, 2026.

What is the largest hail ever reported in Rock Valley?

The largest hail size in these storm-report records in and near Rock Valley, IA is 2.75″. It was reported near Rock Valley, IA on July 5, 1978.

A storm report showed up near my home in Rock Valley — does that mean my roof is damaged?

Not necessarily. A storm report only means hail, wind, or a tornado was observed nearby; it does not confirm damage at any specific address, and conditions change from block to block. Check an address-level hail report first, and if it looks significant, find a local pro that serves Rock Valley and ask about a Remote Hail Inspection before anyone climbs on the roof.

I am buying a home in Rock Valley — why should I look at its storm history?

Recent hail or wind can leave a roof or exterior with damage that is easy to miss during a walkthrough, and a recent roof replacement is sometimes an insurance job after a storm. Reviewing the storm history for a Rock Valley address before closing helps you ask informed questions about roof age, past repairs, and any prior claims.

I am selling a home in Rock Valley — how does this help me?

Knowing the storm history for your address lets you answer buyer questions with confidence, document repairs you have already made, and decide whether a pre-listing roof check is worthwhile. A clear hail history removes a common sticking point during negotiations.

How do I check hail history for a specific Rock Valley address?

Use the address search to pull a free address-level hail report for any property in Rock Valley — no phone number or email required. It shows recent hail activity for that address so you know whether a closer roof or exterior review makes sense.

Where does this storm report data come from, and what are its limits?

Storm reports on this page are public reports from storm events across Rock Valley, IA, sourced from NOAA SPC and NWS Local Storm Reports. They show where hail, wind, or tornado activity was reported in Rock Valley, but they do not confirm damage at any specific property. Report locations, sizes, and times may be approximate and can vary from what an individual home experienced. For property-specific hail history, use an address-level hail report or contact a participating local professional for a remote hail inspection. Pros inclusion is not an endorsement, and contacting a professional does not confirm damage at any property.

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