Tornadoes and Hail in Iowa, September 20, 2001

Name: Tornadoes and Hail in Iowa, September 20, 2001
Start: 2001-09-20T13:25
End: 2001-09-20T18:15
Location: Iowa

September 20, 2001 · NWS DMX · 51 events in 16 counties and zones

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $615,000
Crop damage: $389,000
Events: 51

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS DMX wrote it up.

A strong surge of moist and unstable air moved north into Iowa during the day on the 20th. A warm front lifted north across the state during the day as a strong upper level disturbance approached from the west and northwest. During the afternoon a cold front moved into northwest Iowa with a surface low forming along the front in that area. Ahead of the front the airmass became unstable as dew point temperatures rose into the mid 60s to low 70s. Thunderstorm erupted over north central Iowa during the early afternoon as colder temperatures moved in aloft, destabilizing the atmosphere. Surface based convection developed by mid to late afternoon over the central and southern counties of the state. The main severe weather feature with the storms was hail ranging from one to two inches in diameter. Two inch diameter hail broke out windows in cars north of Northwood in Worth County. Southeast of Northwood, near Silver Lake, hail nearly baseball in size caused considerable damage to property and crops. Hail was reported to be drifted 3 to 4 inches deep in places. Two inch diameter hail also fell in Hancock County at Garner. The storms over southern Iowa, being surface based, had a higher likelihood of becoming tornadic. Indeed one of the storms did produce a brief tornado touchdown in Appanoose County northwest of Udell. The tornado did little damage as it touched down in open country. A tornado also touched down in Lucas County north of Lucas. The tornado struck a farmstead causing considerable damage to several buildings. High winds about a mile north of the tornado damaged a machine shed and moved an outbuilding on a farmstead there. The severe weather event began to change into a wind event toward the end of its life cycle. Winds of 80 MPH were reported in Appanoose County in Udell for example. High winds also swept through areas north of Centerville, and also north of Moulton in Appanoose County.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Des Moines, IA wrote its last area forecast discussion before the first event at Sep 20, 12:45 PM CST, 40 minutes earlier.

Area forecast discussion, Sep 20, 12:45 PM CST, 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
145 PM CDT THU SEP 20 2001

MAIN CONCERN WILL BE DEPARTURE OF SYSTEM NOE AFFECTING STATE AND LTR
PDS WITH RETURN TO FALL SUN/MON TIME FRAME.

MODELS OVERALL AGREE WITH UPPER LEVEL PATTERN RIGHT THROUGH WEEKEND
THOUGH AS USUAL DIFFERENCES COME IN THE DETAIL.  ETA APPEARS TO BE
BEST FIT WITH CURRENT TRENDS OF STRONG VORT OVR ERN SD SWINGING ACRS
NRN IA AND INTO IL BY EVENING.  IN SHORT TERM WEAK SFC LO NWRN IA
AND ASSOCIATED WARM FNT COMBINE TO PUT MST FVRD AREA OF DVLPMNT
INVOF NW/NC IA. ANOTHER AREA MAYBE SERN PORTION OF THE STATE THO
CURRENT STORMS CROSSING THE AREA WILL AFFECT RECVOERY TIME.  CAPES
RUNNING 1500-3000 SW AND NW AND LI -4 TO -6.  FULLY EXPECT
REDEVLOPMENT AS IMPULSE SHOWS ITSELF ROTATING ARND MAIN VORT.  SOME
HINE IN IR STLT/WATER VAPOR.  EXPECT AFTER REDEVELOPMENT THAT SHWRS
WILL LINGER PSBLY UNTIL 06Z IN AGREEMENT WITH MODELS.  FRIDAY AND
MUCH OF SATURDAY LOOK DRY AS LIGHT UPPER LEVEL RIDGING MOVES IN AND
SFC HI.  BY SATURDAY NIGHT NEXT SYSTEM UPSTREAM BEGINS TO AFFECT ST
AND GD LIFT/FORCING AHEAD OF SYSTEM BY SUNDAY MRNG.  GD CHC SHWRS
WITH FARILY STG COLD FNT.  CAA AND PLENTY OF LO LVL MOISTURE POINT
TO SHWRS LKLY BUT WILL WORD WITH 50 POP ATTM.  EXTENDED GUIDANCE
POINT TO VERY COOL BEGINNING TO THE WEEK AS JAMES BAY HI EXTENDS
INTO UPPER MIDWEST AND HOLDS.  FIRST OVRNGT LOWS IN THE 30S
STATEWIDE PSBLE AS COLDEST AIR -4C SWINGS OVER THE STATE.  HIGH
REMAINS FIRLY IN PLACE UNTIL MID WEEK SO ANY MODERATION OF TEMPS
WILL BE SLOW IN COMING.

IFPS TEMPS ADJSTED TO COOLER MEX/FMR IN EFP PDS OTRW GOING FCST GD
IN SHORT TERM GUIDANCE.  ETA WINDS IMPORTED.

.DSM...NONE

FORSTER

In the hours before

Special weather statement, Sep 20, 8:41 AM CST, 4 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DES MOINES IA
941 AM CDT THU SEP 20 2001

A COLD FRONT EXTENDING FROM EASTERN SOUTH DAKOTA THROUGH CENTRAL
NEBRASKA WILL MOVE INTO WESTERN IOWA BY LATE THIS AFTERNOON.
MEANWHILE A WARM FRONT EXTENDING TO THE SOUTHEAST...FROM A LOW
PRESSURE CENTER NEAR SIOUX FALLS...INTO SOUTHEAST IOWA WILL MOVE
ONLY VERY SLOWLY TO THE NORTH.  LOCATIONS JUST NORTH OF THE WARM
FRONT...SOUTH INTO MISSOURI CAN EXPECT SOME SEVERE WEATHER LATE THIS
MORNING INTO THE AFTERNOON HOURS.  MODERATE INSTABILITY AND SHEAR
WILL SUPPORT SOME SEVERE STORMS...A FEW OF WHICH MAY BECOME
SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL AND HIGH WINDS.  ALTHOUGH
THE SHEAR WILL NOT BE REAL STRONG...A FEW OF THE SUPERCELLS MAY
PRODUCE AN ISOLATED TORNADO OR TWO.

SEE SITE SPECIFIC DETAILS BELOW FOR MORE INFORMATION.

IAZ044-045-057>061-070>075-081>086-092>097-211021-
ADAIR-ADAMS-APPANOOSE-AUDUBON-CARROLL-CASS-CLARKE-CRAWFORD-DALLAS-
DAVIS-DECATUR-GUTHRIE-JASPER-LUCAS-MADISON-MAHASKA-MARION-MONROE-
POLK-RINGGOLD-TAYLOR-UNION-WAPELLO-WARREN-WAYNE-
INCLUDING THE CITIES OF...ATLANTIC...CARROLL...CENTERVILLE...
CHARITON...CRESTON...DENISON...DES MOINES...INDIANOLA...KNOXVILLE...
LAMONI...NEWTON...OSKALOOSA...OTTUMWA...PELLA AND PERRY
524 AM CDT THU SEP 20 2001

* EVENT TIMING...10 AM TO 8 PM.

* THREAT CATEGORIES...
     TORNADO..........LOW
     DAMAGING WINDS...MODERATE
     LARGE HAIL.......MODERATE
     FLASH FLOODING...NONE

* SPOTTER ACTIVATION OUTLOOK...HIGH.

IAZ004>007-015>017-023>028-033>039-046>050-062-211021-
BLACK HAWK-BOONE-BREMER-BUTLER-CALHOUN-CERRO
GORDO-EMMET-FRANKLIN-GREENE-GRUNDY-HAMILTON-HANCOCK-HARDIN-HUMBOLDT-
KOSSUTH-MARSHALL-PALO ALTO-POCAHONTAS-POWESHIEK-SAC-STORY-TAMA-
WEBSTER-WINNEBAGO-WORTH-WRIGHT-
INCLUDING THE CITIES OF...ALGONA...AMES...BOONE...ESTHERVILLE...FORT
DODGE...GRINNELL...IOWA FALLS...MARSHALLTOWN...MASON CITY...
WATERLOO...WAVERLY AND WEBSTER CITY
524 AM CDT THU SEP 20 2001

* EVENT TIMING...10 AM TO 8 PM

* THREAT CATEGORIES...
     TORNADO..........NONE
     DAMAGING WINDS...LOW
     LARGE HAIL.......LOW
     FLASH FLOODING...NONE

* SPOTTER ACTIVATION OUTLOOK...LOW.

-------------------------------------------------------------------

THREAT KEY:
    TORNADO.......... ANY TORNADO OCCURRENCE
    DAMAGING WINDS... WINDS >= 58 MPH
    LARGE HAIL....... HAIL >= 3/4 INCH DIAMETER
    FLASH FLOODING... FLOODING CAUSED BY HEAVY RAINS WITHIN 6 HOURS
                      OF RAIN EVENT. POSES THREAT TO LIFE OR
                      PROPERTY.

THREAT CATEGORY KEY:  PROBABILITY OF THREAT OCCURRING WITHIN 25
                      MILES OF POINT WITHIN FORECAST AREA
    NONE....... NOT EXPECTED.  LESS THAN 5% ( 2% FOR TORNADOES)
    LOW........ 5-15% (2-15% FOR TORNADOES)
    MODERATE... 25-35%
    HIGH....... 45% OR GREATER

SPOTTER ACTIVATION OUTLOOK KEY:
    NOT EXPECTED
    LOW........ ACTIVATION POSSIBLE BUT NOT LIKELY
    MODERATE... POSSIBILITIES ABOUT 50-50
    HIGH....... ACTIVATION LIKELY

FOR MORE INFORMATION ON PROBABILISTIC SEVERE WEATHER OUTLOOKS...GO
TO THE STORM PREDICTION CENTER WEBSITE AT
WWW.SPC.NOAA.GOV/PRODUCTS/OUTLOOK/PROBINFO.HTML .

SEARCY

Local storm report, Sep 20, 11:30 AM CST, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1230 PM CDT THU SEP 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1220 PM    BROOKS                    IA   1.75 INCH HAIL
09/20/01   ADAMS                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

Local storm report, Sep 20, 11:43 AM CST, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1243 PM CDT THU SEP 20 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1230 PM    CORNING                   IA   .75 INCH HAIL
09/20/01   ADAMS                          REPORTED BY STORM
                                          SPOTTER.

The radar

The Sioux Falls radar (KFSD), 176 km away, was scanning. The volume nearest the first event began at 19:25 UTC.

Open the radar archive at this moment

Event by event

45 hail, 4 thunderstorm wind, 2 tornado. Local standard time, as filed.

Hail, Kossuth

When: September 20, 1:25 PM CST
Where: Kossuth County, 25 mi NW of Algona
Measured: 0.75 in hail
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 43.317, -94.583

Hail, Kossuth

When: September 20, 1:38 PM CST
Where: Kossuth County, 20 mi NNW of Algona
Measured: 1 in hail
Property damage: $3,000
Crop damage: $5,000
Reported by: TRAINED SPOTTER
Coordinates: 43.333, -94.383

Hail, Kossuth

When: September 20, 1:47 PM CST
Where: Kossuth County, Bancroft
Measured: 1 in hail
Property damage: $5,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 43.283, -94.217

Hail, Worth

When: September 20, 1:52 PM CST
Where: Worth County, 12 mi N of Northwood
Measured: 2 in hail
Property damage: $20,000
Crop damage: $10,000
Reported by: TRAINED SPOTTER
Coordinates: 43.617, -93.217

Hail, Worth

When: September 20, 1:57 PM CST
Where: Worth County, 3 mi W of Silver Lake
Measured: 1 in hail
Property damage: $80,000
Crop damage: $100,000
Reported by: TRAINED SPOTTER
Coordinates: 43.483, -93.433

Hail, Kossuth

When: September 20, 2:00 PM CST
Where: Kossuth County, Titonka
Measured: 1.75 in hail
Property damage: $20,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 43.233, -94.050

Hail, Winnebago

When: September 20, 2:08 PM CST
Where: Winnebago County, 6 mi SW of Thompson
Measured: 1.25 in hail
Property damage: $2,000
Crop damage: $2,000
Reported by: NWS EMPLOYEE(OFF DUTY)
Coordinates: 43.300, -93.867

Hail, Kossuth

When: September 20, 2:10 PM CST
Where: Kossuth County, 3 mi N of Titonka
Measured: 2 in hail
Property damage: $15,000
Crop damage: $10,000
Reported by: LAW ENFORCEMENT
Coordinates: 43.283, -94.050

Hail, Kossuth

When: September 20, 2:10 PM CST
Where: Kossuth County, Algona Muni Arpt
Measured: 1.75 in hail
Property damage: $25,000
Crop damage: $10,000
Reported by: LAW ENFORCEMENT
Coordinates: 43.067, -94.267

Hail, Hancock

When: September 20, 2:10 PM CST
Where: Hancock County, 1 mi NW of Woden
Measured: 1.25 in hail
Property damage: $5,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 43.250, -93.933

Hail, Kossuth

When: September 20, 2:10 PM CST
Where: Kossuth County, 2 mi N of Whittemore
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: BROADCAST MEDIA
Coordinates: 43.100, -94.417

Hail, Winnebago

When: September 20, 2:10 PM CST
Where: Winnebago County, 8 mi SW of Thompson
Measured: 1.25 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: TRAINED SPOTTER
Coordinates: 43.283, -93.900

Hail, Worth

When: September 20, 2:15 PM CST
Where: Worth County, Silver Lake
Measured: 2.5 in hail
Property damage: $50,000
Crop damage: $50,000
Reported by: NEWSPAPER
Coordinates: 43.483, -93.367

Hail, Worth

When: September 20, 2:18 PM CST
Where: Worth County, 5 mi NW of Northwood
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: TRAINED SPOTTER
Coordinates: 43.500, -93.283

Hail, Hancock

When: September 20, 2:18 PM CST
Where: Hancock County, Woden
Measured: 1.75 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: BROADCAST MEDIA
Coordinates: 43.233, -93.917

Hail, Worth

When: September 20, 2:19 PM CST
Where: Worth County, Northwood
Measured: 1 in hail
Property damage: $5,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 43.450, -93.217

Hail, Kossuth

When: September 20, 2:20 PM CST
Where: Kossuth County, Algona
Measured: 1 in hail
Property damage: $5,000
Crop damage: $2,000
Reported by: LAW ENFORCEMENT
Coordinates: 43.067, -94.233

Hail, Worth

When: September 20, 2:22 PM CST
Where: Worth County, Northwood
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: TRAINED SPOTTER
Coordinates: 43.450, -93.217

Hail, Kossuth

When: September 20, 2:25 PM CST
Where: Kossuth County, Algona
Measured: 1 in hail
Property damage: $3,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 43.067, -94.233

Hail, Worth

When: September 20, 2:28 PM CST
Where: Worth County, Northwood
Measured: 1 in hail
Property damage: $5,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 43.450, -93.217

Hail, Hancock

When: September 20, 2:45 PM CST
Where: Hancock County, Garner
Measured: 2 in hail
Property damage: $25,000
Crop damage: $10,000
Reported by: EMERGENCY MANAGER
Coordinates: 43.100, -93.617

Hail, Cerro Gordo

When: September 20, 2:54 PM CST
Where: Cerro Gordo County, 4 mi W of Ventura
Measured: 0.75 in hail
Crop damage: $1,000
Reported by: TRAINED SPOTTER
Coordinates: 43.133, -93.567

Hail, Humboldt

When: September 20, 3:05 PM CST
Where: Humboldt County, Renwick
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 42.833, -93.983

Hail, Wright

When: September 20, 3:17 PM CST
Where: Wright County, 1 mi N of Goldfield
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $10,000
Reported by: EMERGENCY MANAGER
Coordinates: 42.750, -93.917

Hail, Warren

When: September 20, 3:17 PM CST
Where: Warren County, St Marys
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 41.317, -93.733

Hail, Franklin

When: September 20, 3:30 PM CST
Where: Franklin County, 7 mi E of Sheffield
Measured: 1 in hail
Property damage: $2,000
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 42.900, -93.067

Hail, Wright

When: September 20, 3:30 PM CST
Where: Wright County, Clarion
Measured: 1 in hail
Property damage: $5,000
Crop damage: $2,000
Reported by: LAW ENFORCEMENT
Coordinates: 42.733, -93.733

Hail, Warren

When: September 20, 3:35 PM CST
Where: Warren County, 8 mi E of St Marys
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 41.317, -93.583

Hail, Warren

When: September 20, 3:39 PM CST
Where: Warren County, 4 mi W of Milo
Measured: 1.75 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 41.283, -93.533

Hail, Butler

When: September 20, 3:40 PM CST
Where: Butler County, Aredale
Measured: 0.75 in hail
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 42.833, -93.000

Hail, Butler

When: September 20, 3:53 PM CST
Where: Butler County, 7 mi W of Allison
Measured: 0.75 in hail
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 42.750, -92.917

Hail, Marion

When: September 20, 4:00 PM CST
Where: Marion County, 2 mi E of Otley
Measured: 1 in hail
Property damage: $3,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 41.467, -93.000

Hail, Hamilton

When: September 20, 4:00 PM CST
Where: Hamilton County, 3 mi NW of Williams
Measured: 0.75 in hail
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 42.517, -93.600

Hail, Warren

When: September 20, 4:03 PM CST
Where: Warren County, Lacona
Measured: 1 in hail
Property damage: $5,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 41.200, -93.383

Hail, Warren

When: September 20, 4:04 PM CST
Where: Warren County, Lacona
Measured: 1.5 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: TRAINED SPOTTER
Coordinates: 41.200, -93.383

Hail, Butler

When: September 20, 4:10 PM CST
Where: Butler County, Clarksville
Measured: 0.88 in hail
Property damage: $1,000
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 42.783, -92.667

Hail, Butler

When: September 20, 4:12 PM CST
Where: Butler County, 5 mi SE of Allison
Measured: 0.75 in hail
Crop damage: $1,000
Reported by: TRAINED SPOTTER
Coordinates: 42.700, -92.717

Hail, Hamilton

When: September 20, 4:18 PM CST
Where: Hamilton County, 5 mi SW of Williams
Measured: 1 in hail
Property damage: $2,000
Crop damage: $3,000
Reported by: TRAINED SPOTTER
Coordinates: 42.433, -93.617

Hail, Hamilton

When: September 20, 4:21 PM CST
Where: Hamilton County, 2 mi S of Williams
Measured: 0.75 in hail
Crop damage: $1,000
Reported by: TRAINED SPOTTER
Coordinates: 42.450, -93.550

Hail, Mahaska

When: September 20, 4:30 PM CST
Where: Mahaska County, New Sharon
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $2,000
Reported by: TRAINED SPOTTER
Coordinates: 41.467, -92.667

Tornado, Lucas

When: September 20, 4:30 PM CST
Where: Lucas County, 8 mi NNE of Lucas
Rating: F0
Path length: 0.9 mi
Path width: 70 yd
Property damage: $50,000
Crop damage: $5,000
Reported by: NWS STORM SURVEY
Coordinates: 41.133, -93.400

Tornado caused damage to a farmstead north-northeast of Lucas.

Thunderstorm Wind, Lucas

When: September 20, 4:32 PM CST
Where: Lucas County, 9 mi NNE of Lucas
Measured: 65 kt (75 mph)
Property damage: $30,000
Crop damage: $10,000
Reported by: BROADCAST MEDIA
Coordinates: 41.150, -93.400

Tornado, Appanoose

When: September 20, 5:09 PM CST
Where: Appanoose County, 3 mi N of Udell
Rating: F1
Path length: 0.5 mi
Path width: 50 yd
Property damage: $5,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 40.833, -92.733

Tornado touched down in open country, causing little damage.

Thunderstorm Wind, Appanoose

When: September 20, 5:23 PM CST
Where: Appanoose County, 3 mi N of Centerville
Measured: 61 kt (70 mph)
Property damage: $5,000
Crop damage: $3,000
Reported by: LAW ENFORCEMENT
Coordinates: 40.783, -92.867

Hail, Davis

When: September 20, 5:48 PM CST
Where: Davis County, Bloomfield
Measured: 2 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 40.750, -92.417

Thunderstorm Wind, Appanoose

When: September 20, 5:49 PM CST
Where: Appanoose County, Udell
Measured: 70 kt (81 mph)
Property damage: $50,000
Crop damage: $10,000
Reported by: LAW ENFORCEMENT
Coordinates: 40.783, -92.733

Hail, Appanoose

When: September 20, 5:49 PM CST
Where: Appanoose County, Udell
Measured: 1.75 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: UNKNOWN
Coordinates: 40.783, -92.733

Thunderstorm Wind, Appanoose

When: September 20, 5:56 PM CST
Where: Appanoose County, 5 mi N of Moulton
Measured: 52 kt (60 mph)
Property damage: $5,000
Reported by: LAW ENFORCEMENT
Coordinates: 40.750, -92.667

Hail, Davis

When: September 20, 5:57 PM CST
Where: Davis County, Bloomfield
Measured: 1 in hail
Property damage: $5,000
Crop damage: $2,000
Reported by: EMERGENCY MANAGER
Coordinates: 40.750, -92.417

Hail, Davis

When: September 20, 6:00 PM CST
Where: Davis County, 2 mi SE of Bloomfield
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $22,000
Reported by: TRAINED SPOTTER
Coordinates: 40.733, -92.383

Hail, Davis

When: September 20, 6:15 PM CST
Where: Davis County, Pulaski
Measured: 1 in hail
Property damage: $10,000
Crop damage: $15,000
Reported by: NEWSPAPER
Coordinates: 40.700, -92.267

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Iowa in 2001 Every state in 2001 This day in weather history The tornado archive for Iowa, 2001 Warnings in Iowa, September 2001

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5267229, 5267230, 5267231, 5267232, 5267233, 5267234, 5267355, 5267235, 5267236, 5267237, 5267238, 5267358, 5267360, 5267239, 5267240, 5267241, 5267242, 5267243, 5267245, 5267246, 5267354, 5267244, 5267247, 5267248, 5267249, 5267250, 5267359, 5267251, 5267252, 5267253, 5267254, 5267255, 5267256, 5267257, 5267258, 5267259, 5267260, 5267343, 5267344, 5267345, and more.