Alert archive / Iowa / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 178, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Sep 7, 2012, 1:20 AM CDT for Boone County, Greene County, Story County, Iowa. It was in force for 40 min. 5 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
- Sep 7, 2012, 1:20 AM CDT (06:20 UTC)
- Expired
- Sep 7, 2012, 2:00 AM CDT
- In force
- 40 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Boone County, IA, Greene County, IA, Story County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 7, 1:28 AM CDT | HAIL 1.75 | 2 S Boxholm, IA | EMERGENCY MANAGER REPORTS PING PONG TO GOLF BALL HAIL. |
| Sep 7, 1:32 AM CDT | HAIL 0.88 | Boxholm, IA | 10 MINUTES OF PEA TO NICKEL HAIL. |
| Sep 7, 1:44 AM CDT | HAIL 1.5 | 3 Sw Fraser, IA | |
| Sep 7, 1:50 AM CDT | HAIL 0.88 | Boone, IA | |
| Sep 7, 2:00 AM CDT | HAIL 1 | 3 Sse Boone Airport, IA | MINOR CAR DAMAGE NOTED. QUARTER SIZE HAIL WAS THE LARGEST OBSERVED...BUT MAY HAVE BEEN LARGER. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 6.3 hours before the alert went out and 234 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
- 275 J/kg
- Mixed-layer CIN
- -320 J/kg
- Mixed-layer LCL
- 2527 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
554 WUUS53 KDMX 070620 SVRDMX IAC015-073-169-070700- /O.NEW.KDMX.SV.W.0178.120907T0620Z-120907T0700Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 120 AM CDT FRI SEP 7 2012 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... BOONE COUNTY IN CENTRAL IOWA... NORTHEASTERN GREENE COUNTY IN WEST CENTRAL IOWA... SOUTHWESTERN STORY COUNTY IN CENTRAL IOWA... * UNTIL 200 AM CDT * AT 116 AM 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 9 MILES NORTHWEST OF OGDEN...OR 25 MILES SOUTH OF FORT DODGE...AND MOVING SOUTHEAST AT 55 MPH. * LOCATIONS IMPACTED INCLUDE... AMES...OGDEN...BOONE...MADRID...HUXLEY...PILOT MOUND...FRASER... BOONE AIRPORT...LUTHER...GILBERT...KELLEY...AMES AIRPORT... SLATER...SHELDAHL...CAMBRIDGE AND MAXWELL. THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 103 AND 117. 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. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...DEADLY CLOUD TO GROUND LIGHTNING IS OCCURRING CONTINUOUSLY WITH THIS STORM. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. TURN AROUND DON/T DROWN. && LAT...LON 4187 9327 4186 9397 4221 9434 4221 9371 TIME...MOT...LOC 0620Z 304DEG 47KT 4211 9409 WIND...HAIL 60MPH 1.00IN $$ SKOW
2 follow-up statements
369
WWUS53 KDMX 070631
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
131 AM CDT FRI SEP 7 2012
IAC073-070641-
/O.CAN.KDMX.SV.W.0178.000000T0000Z-120907T0700Z/
GREENE IA-
131 AM CDT FRI SEP 7 2012
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GREENE COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4221 9416 4221 9371 4187 9327 4187 9385
4204 9416
TIME...MOT...LOC 0631Z 287DEG 29KT 4213 9404
$$
IAC015-169-070700-
/O.CON.KDMX.SV.W.0178.000000T0000Z-120907T0700Z/
STORY IA-BOONE IA-
131 AM CDT FRI SEP 7 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BOONE AND
SOUTHWESTERN STORY COUNTIES UNTIL 200 AM CDT...
AT 126 AM CDT...EMERGENCY MANAGEMENT REPORTED A SEVERE THUNDERSTORM
PRODUCING GOLF BALL SIZE HAIL. THIS STORM WAS LOCATED 8 MILES
NORTHWEST OF OGDEN...OR 25 MILES WEST OF AMES...MOVING EAST AT 35
MPH.
LOCATIONS IMPACTED INCLUDE...
AMES...OGDEN...BOONE...MADRID...HUXLEY...FRASER...BOONE AIRPORT...
LUTHER...GILBERT...AMES AIRPORT...KELLEY...SLATER...CAMBRIDGE AND
MAXWELL.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 103 AND 117.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.
&&
LAT...LON 4221 9416 4221 9371 4187 9327 4187 9385
4204 9416
TIME...MOT...LOC 0631Z 287DEG 29KT 4213 9404
WIND...HAIL <50MPH 1.75IN
$$
SKOW242
WWUS53 KDMX 070651
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
151 AM CDT FRI SEP 7 2012
IAC015-169-070700-
/O.CON.KDMX.SV.W.0178.000000T0000Z-120907T0700Z/
STORY IA-BOONE IA-
151 AM CDT FRI SEP 7 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BOONE AND
SOUTHWESTERN STORY COUNTIES UNTIL 200 AM CDT...
AT 149 AM CDT...EMERGENCY MANAGEMENT REPORTED A SEVERE THUNDERSTORM
PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR BOONE...OR
12 MILES WEST OF AMES...MOVING EAST AT 35 MPH.
LOCATIONS IMPACTED INCLUDE...
AMES...MADRID...HUXLEY...LUTHER...GILBERT...AMES AIRPORT...
KELLEY...SLATER...CAMBRIDGE AND MAXWELL.
THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 103 AND 117.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PREPARE FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE
OUTSIDE SHOULD MOVE TO A REINFORCED BUILDING AND AWAY FROM WINDOWS.
&&
LAT...LON 4200 9409 4221 9395 4221 9371 4187 9327
4187 9385
TIME...MOT...LOC 0651Z 287DEG 29KT 4207 9384
WIND...HAIL <50MPH 1.00IN
$$
SKOWThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 10:42 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac | 48 min |
| Sep 6, 11:15 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Greene, Webster | 45 min |
| Sep 6, 11:53 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Greene | 27 min |
| Sep 7, 1:45 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Tama | 45 min |
| Sep 7, 1:48 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac, Webster | 42 min |
| Sep 7, 1:58 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Polk, Story | 47 min |
| Sep 7, 3:05 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Hamilton, Story, Webster | 40 min |
| Sep 7, 3:25 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Poweshiek | 50 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.