Alert archive / Iowa / Tornado Warnings in 2015
Tornado Warning 8, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at May 17, 2015, 4:03 AM CDT for Boone County, Webster County, Iowa. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 17, 2015, 4:03 AM CDT (09:03 UTC)
- Expired
- May 17, 2015, 4:24 AM CDT
- In force
- 21 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.0 in
Counties Boone County, IA, Webster County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 9.1 hours before the alert went out and 218 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1511 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
821
WFUS53 KDMX 170903
TORDMX
IAC015-187-170945-
/O.NEW.KDMX.TO.W.0008.150517T0903Z-150517T0945Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
403 AM CDT SUN MAY 17 2015
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHEASTERN WEBSTER COUNTY IN CENTRAL IOWA...
NORTHWESTERN BOONE COUNTY IN CENTRAL IOWA...
* UNTIL 445 AM CDT
* AT 401 AM CDT...A CONFIRMED TORNADO WAS JUST WEST OF OGDEN AND IS
NOW LOCATED 8 MILES NORTH OF OGDEN...OR 12 MILES NORTHWEST OF
BOONE...MOVING NORTH AT 40 MPH.
HAZARD...DAMAGING TORNADO.
SOURCE...BOONE COUNTY EMERGENCY MANAGER CONFIRMED A TORNADO JUST
WEST OF OGDEN.
IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED.
DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE
DAMAGE IS LIKELY.
* THE TORNADO WILL BE NEAR...
FORT DODGE AROUND 445 AM CDT.
OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
DOLLIVER MEMORIAL STATE PARK...DUNCOMBE...LEHIGH...WOODMAN HOLLOW
STATE PARK...BRUSHY CREEK ST RECREATION AREA...DAYTON...PILOT
MOUND...HARCOURT...BOXHOLM AND OTHO.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW! MOVE TO A
BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A MOBILE HOME...OR
IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.
TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.
TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN
DES MOINES .
&&
LAT...LON 4210 9398 4209 9412 4251 9427 4254 9398
TIME...MOT...LOC 0901Z 175DEG 34KT 4216 9406
TORNADO...OBSERVED
HAIL...0.00IN
$$
BOKSA2 follow-up statements
051
WWUS53 KDMX 170919
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
419 AM CDT SUN MAY 17 2015
IAC015-170928-
/O.CAN.KDMX.TO.W.0008.000000T0000Z-150517T0945Z/
BOONE IA-
419 AM CDT SUN MAY 17 2015
...THE TORNADO WARNING FOR NORTHWESTERN BOONE COUNTY IS CANCELLED...
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 4223 9398 4223 9417 4251 9427 4254 9398
TIME...MOT...LOC 0918Z 175DEG 34KT 4233 9408
$$
IAC187-170945-
/O.CON.KDMX.TO.W.0008.000000T0000Z-150517T0945Z/
WEBSTER IA-
419 AM CDT SUN MAY 17 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 445 AM CDT FOR
SOUTHEASTERN WEBSTER COUNTY...
AT 418 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 11 MILES EAST OF GOWRIE...OR 13 MILES SOUTH OF FORT
DODGE...AND IS NEARLY STATIONARY.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
LIKELY.
THIS DANGEROUS STORM WILL BE NEAR...
FORT DODGE AROUND 445 AM CDT.
OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
DOLLIVER MEMORIAL STATE PARK...DUNCOMBE...LEHIGH...WOODMAN HOLLOW
STATE PARK...BRUSHY CREEK ST RECREATION AREA...DAYTON...HARCOURT...
OTHO AND COALVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.
IF A TORNADO OR OTHER SEVERE WEATHER IS SPOTTED...REPORT IT TO THE
NATIONAL WEATHER SERVICE OR YOUR LOCAL NEAREST LAW ENFORCEMENT AGENCY
WHO WILL SEND YOUR REPORT. THIS ACT MAY SAVE LIVES OF OTHERS IN THE
PATH OF DANGEROUS WEATHER.
&&
LAT...LON 4223 9398 4223 9417 4251 9427 4254 9398
TIME...MOT...LOC 0918Z 175DEG 34KT 4233 9408
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
BOKSA706
WWUS53 KDMX 170924
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
424 AM CDT SUN MAY 17 2015
IAC187-170933-
/O.CAN.KDMX.TO.W.0008.000000T0000Z-150517T0945Z/
WEBSTER IA-
424 AM CDT SUN MAY 17 2015
...THE TORNADO WARNING FOR SOUTHEASTERN WEBSTER COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING HAS BEEN CANCELLED.
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
DES MOINES .
LAT...LON 4223 9398 4223 9417 4251 9427 4254 9398
TIME...MOT...LOC 0921Z 175DEG 34KT 4239 9409
$$
BOKSAThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 17, 3:11 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene | 49 min |
| May 17, 3:13 AM CDT | Tornado Warning | DMX | Dallas | 32 min |
| May 17, 3:26 AM CDT | Special Weather Statement | DMX | Jasper, Mahaska, Marshall, Poweshiek, Story, Tama | 49 min |
| May 17, 3:30 AM CDT | Tornado Warning | DMX | Boone, Dallas | 30 min |
Nearby
Tornado Warnings in Iowa, 2015Every tornado warning in 2015Tornadoes in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.