Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 155, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 8, 2012, 3:54 PM CDT for Dallas County, Polk County, Iowa. It was in force for 38 min. 12 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 8, 2012, 3:54 PM CDT (20:54 UTC)
- Expired
- Aug 8, 2012, 4:32 PM CDT
- In force
- 38 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Dallas County, IA, Polk County, IA
The radar
The Des Moines radar (KDMX), 12 km from the middle of the area, began a volume at 20:54 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 8, 3:54 PM CDT | TSTM WND DMG | 2 Ene Waukee, IA | 12 INCH DIAMETER TREES SNAPPED AT BASE SOUTH OF THE INTERSECTION OF HICKMAN AND 156TH. |
| Aug 8, 3:55 PM CDT | TSTM WND GST 65 | Ssw Clive, IA | |
| Aug 8, 3:57 PM CDT | TSTM WND GST 60 | West Des Moines, IA | AT INTERSECTION OF 68TH AND DOUGLAS...NUMEROUS 2 INCH DIAMETER LIMBS DOWN WITH WINDS ESTIMATED IN EXCESS OF 60 MPH. |
| Aug 8, 3:59 PM CDT | HAIL 1 | 3 Ne Des Moines, IA | TRAINED SPOTTER REPORTS HAIL RANGING UP TO QUARTER SIZED ALONG WITH STRONG WIND GUSTS. MULTIPLE BRANCHES DOWN UP TO 6-8 INCHES IN DIAMETER. MINOR HAIL DAMAGE TO VEHICLES. ALSO LOW LYING INTERSECTIONS IMPASSIBLE DUE TO STANDING WATER FROM HEAVY RAINS. |
| Aug 8, 4:02 PM CDT | TSTM WND GST 65 | 1 Nnw Des Moines, IA | AT KCCI STUDIO |
| Aug 8, 4:02 PM CDT | TSTM WND GST 70 | West Des Moines, IA | WINDS ESTIMATED IN EXCESS OF 70 MPH. EXTREME RAINFALL RATES AS WELL. |
| Aug 8, 4:04 PM CDT | HAIL 1 | Grimes, IA | AMATEUR RADIO OPERATOR REPORTED QUARTER SIZED HAIL IN GRIMES. |
| Aug 8, 4:04 PM CDT | HAIL 1 | Urbandale, IA | |
| Aug 8, 4:06 PM CDT | TSTM WND GST 66 | 6 Nw Des Moines, IA | |
| Aug 8, 4:09 PM CDT | TSTM WND GST 70 | 2 E Urbandale, IA | WIND ACCOMPANIED BY QUARTER HAIL |
| Aug 8, 4:11 PM CDT | TSTM WND GST 65 | 4 Ene Des Moines, IA | 65 MPH WINDS ESTIMATED AT THE STATE FAIR GROUNDS. |
| Aug 8, 4:17 PM CDT | TSTM WND GST 50 | 2 Nw Clive, IA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 8, 2:21 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 8.9 hours before the alert went out and 220 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
- 994 J/kg
- Mixed-layer CIN
- -254 J/kg
- Mixed-layer LCL
- 1661 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
519 WUUS53 KDMX 082054 SVRDMX IAC049-153-082145- /O.NEW.KDMX.SV.W.0155.120808T2054Z-120808T2145Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 354 PM CDT WED AUG 8 2012 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN DALLAS COUNTY IN CENTRAL IOWA... SOUTHERN POLK COUNTY IN CENTRAL IOWA... * UNTIL 445 PM CDT * AT 350 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR WAUKEE...OR 13 MILES WEST OF DES MOINES...AND MOVING EAST AT 25 MPH. * LOCATIONS IMPACTED INCLUDE... DES MOINES...GRIMES...CLIVE...WEST DES MOINES...URBANDALE...WINDSOR HEIGHTS...JOHNSTON...ANKENY...PLEASANT HILL...ALTOONA...DES MOINES INT AIRPORT...SAYLORVILLE AND ANKENY AIRPORT. THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 114 AND 143. THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 68 AND 93. THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 14. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO AN INTERIOR ROOM AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING. && LAT...LON 4167 9398 4177 9348 4152 9342 4150 9393 TIME...MOT...LOC 2054Z 259DEG 20KT 4160 9383 WIND...HAIL 60MPH 1.00IN $$
3 follow-up statements
161 WWUS53 KDMX 082101 SVSDMX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 401 PM CDT WED AUG 8 2012 IAC049-153-082145- /O.CON.KDMX.SV.W.0155.000000T0000Z-120808T2145Z/ POLK IA-DALLAS IA- 401 PM CDT WED AUG 8 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN DALLAS AND SOUTHERN POLK COUNTIES UNTIL 445 PM CDT... AT 358 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR CLIVE...OR 10 MILES WEST OF DES MOINES...MOVING EAST AT 25 MPH. IN ADDITION...FROM 350 TO 400 PM NUMEROUS REPORTS OF 60 TO 70 MPH WINDS HAVE BEEN REPORTED OVER THE THE WEST SIDE OF THE DES MOINES METROPOLITAN AREA WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... DES MOINES...GRIMES...CLIVE...WEST DES MOINES...URBANDALE...WINDSOR HEIGHTS...JOHNSTON...ANKENY...PLEASANT HILL...ALTOONA...DES MOINES INT AIRPORT...SAYLORVILLE AND ANKENY AIRPORT. THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 114 AND 143. THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 68 AND 94. THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 14. PRECAUTIONARY/PREPAREDNESS ACTIONS... PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING. && LAT...LON 4167 9398 4177 9348 4152 9342 4150 9393 TIME...MOT...LOC 2100Z 259DEG 20KT 4161 9379 WIND...HAIL 70MPH 1.00IN $$
511
WWUS53 KDMX 082109
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
409 PM CDT WED AUG 8 2012
IAC049-082119-
/O.CAN.KDMX.SV.W.0155.000000T0000Z-120808T2145Z/
DALLAS IA-
409 PM CDT WED AUG 8 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DALLAS COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED EAST OF THE WARNED
AREA.
LAT...LON 4159 9379 4171 9378 4177 9348 4152 9342
4151 9379
TIME...MOT...LOC 2109Z 259DEG 20KT 4162 9372
$$
IAC153-082145-
/O.CON.KDMX.SV.W.0155.000000T0000Z-120808T2145Z/
POLK IA-
409 PM CDT WED AUG 8 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN POLK
COUNTY UNTIL 445 PM CDT...
AT 407 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR
URBANDALE...OR 7 MILES NORTHWEST OF DES MOINES...MOVING EAST AT 25
MPH.
LOCATIONS IMPACTED INCLUDE...
DES MOINES...WINDSOR HEIGHTS...JOHNSTON...ANKENY...PLEASANT HILL...
ALTOONA...DES MOINES INT AIRPORT...SAYLORVILLE AND ANKENY AIRPORT.
THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 122 AND 143.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 68 AND 94.
THIS INCLUDES INTERSTATE 235 BETWEEN MILE MARKERS 1 AND 14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE FOR DAMAGING WINDS...FALLING TREES AND FLYING DEBRIS. MOVE
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE IN A MOBILE HOME...GET
OUT NOW...AND SEEK SHELTER IN A REINFORCED BUILDING.
&&
LAT...LON 4159 9379 4171 9378 4177 9348 4152 9342
4151 9379
TIME...MOT...LOC 2109Z 259DEG 20KT 4162 9372
WIND...HAIL 70MPH 1.00IN
$$137
WWUS53 KDMX 082132
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
432 PM CDT WED AUG 8 2012
IAC153-082142-
/O.CAN.KDMX.SV.W.0155.000000T0000Z-120808T2145Z/
POLK IA-
432 PM CDT WED AUG 8 2012
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN POLK COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER HEAVY RAIN AND LOCAL FLOODING ARE STILL LIKELY WITH THIS
THUNDERSTORM.
LAT...LON 4159 9379 4171 9378 4177 9348 4152 9342
4151 9379
TIME...MOT...LOC 2132Z 259DEG 20KT 4164 9355
$$The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 7:45 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Cass | 45 min |
| Aug 8, 2:00 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Greene | 45 min |
| Aug 8, 2:37 PM CDT | Severe Thunderstorm Warning | DMX | Greene | 53 min |
| Aug 8, 3:01 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene, Guthrie | 43 min |
| Aug 8, 3:09 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Madison | 51 min |
| Aug 8, 3:30 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Story | 30 min |
| Aug 8, 4:16 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion, Polk, Warren | 29 min |
| Aug 8, 4:45 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Winnebago | 36 min |
| Aug 8, 4:48 PM CDT | Severe Thunderstorm Warning | DMX | Worth | 27 min |
| Aug 8, 6:05 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Franklin | 25 min |
| Aug 8, 6:29 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Franklin | 46 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2012Every severe thunderstorm warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.