Alert archive / Iowa / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 2, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Mar 20, 2011, 5:27 AM CDT for 4 counties in Iowa. It was in force for 48 min. 1 report 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
- Mar 20, 2011, 5:27 AM CDT (10:27 UTC)
- Expired
- Mar 20, 2011, 6:15 AM CDT
- In force
- 48 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Black Hawk County, IA, Grundy County, IA, Marshall County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 118 km from the middle of the area, began a volume at 10:28 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 |
|---|---|---|---|
| Mar 20, 6:01 AM CDT | HAIL 0.88 | Cedar Falls, IA | TRAINED SPOTTER IN CEDAR FALLS REPORTS NICKEL SIZED HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 10.5 hours before the alert went out and 191 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
- 0 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 262 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
444
WUUS53 KDMX 201027
SVRDMX
IAC013-075-127-171-201115-
/O.NEW.KDMX.SV.W.0002.110320T1027Z-110320T1115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
527 AM CDT SUN MAR 20 2011
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
BLACK HAWK COUNTY IN NORTHEAST IOWA...
SOUTHEASTERN GRUNDY COUNTY IN CENTRAL IOWA...
NORTHEASTERN MARSHALL COUNTY IN CENTRAL IOWA...
NORTHWESTERN TAMA COUNTY IN CENTRAL IOWA...
* UNTIL 615 AM CDT
* AT 524 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR CONRAD...OR 11 MILES NORTH OF
MARSHALLTOWN...AND MOVING NORTHEAST AT 50 MPH.
* LOCATIONS IMPACTED INCLUDE...
WATERLOO...REINBECK...HUDSON...CEDAR FALLS...EVANSDALE...
GLADBROOK...LINCOLN...MORRISON...WATERLOO AIRPORT...ELK RUN HEIGHTS
AND RAYMOND.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
LARGE HAIL CAN CAUSE INJURY AND PROPERTY DAMAGE. SEEK SAFETY INDOORS
UNTIL THE STORM PASSES.
&&
LAT...LON 4212 9285 4220 9294 4264 9239 4264 9234
4249 9215
TIME...MOT...LOC 1027Z 228DEG 42KT 4221 9282
WIND...HAIL <50MPH 1.00IN
$$
COGIL4 follow-up statements
123
WWUS53 KDMX 201036
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
536 AM CDT SUN MAR 20 2011
IAC127-201046-
/O.CAN.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
MARSHALL IA-
536 AM CDT SUN MAR 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MARSHALL COUNTY
IS CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4219 9272 4228 9284 4264 9239 4264 9234
4249 9215
TIME...MOT...LOC 1036Z 231DEG 43KT 4226 9268
$$
IAC013-075-171-201115-
/O.CON.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
BLACK HAWK IA-GRUNDY IA-TAMA IA-
536 AM CDT SUN MAR 20 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
TAMA...SOUTHEASTERN GRUNDY AND BLACK HAWK COUNTIES UNTIL 615 AM
CDT...
AT 532 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED 7 MILES EAST OF CONRAD...OR 16 MILES NORTHEAST OF
MARSHALLTOWN...MOVING NORTHEAST AT 50 MPH.
LOCATIONS IMPACTED INCLUDE...
WATERLOO...REINBECK...HUDSON...CEDAR FALLS...EVANSDALE...
MORRISON...WATERLOO AIRPORT...ELK RUN HEIGHTS AND RAYMOND.
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 4219 9272 4228 9284 4264 9239 4264 9234
4249 9215
TIME...MOT...LOC 1036Z 231DEG 43KT 4226 9268
WIND...HAIL <50MPH 1.00IN
$$
COGIL837
WWUS53 KDMX 201047
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
547 AM CDT SUN MAR 20 2011
IAC171-201057-
/O.CAN.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
TAMA IA-
547 AM CDT SUN MAR 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TAMA COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4229 9253 4230 9256 4239 9271 4264 9239
4264 9234 4249 9215
TIME...MOT...LOC 1047Z 228DEG 45KT 4236 9255
$$
IAC013-075-201115-
/O.CON.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
BLACK HAWK IA-GRUNDY IA-
547 AM CDT SUN MAR 20 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
GRUNDY AND BLACK HAWK COUNTIES UNTIL 615 AM CDT...
AT 545 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR REINBECK...OR 15 MILES SOUTHWEST OF
WATERLOO...MOVING NORTHEAST AT 50 MPH.
LOCATIONS IMPACTED INCLUDE...
WATERLOO...HUDSON...CEDAR FALLS...EVANSDALE...WATERLOO AIRPORT...
ELK RUN HEIGHTS AND RAYMOND.
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 4229 9253 4230 9256 4239 9271 4264 9239
4264 9234 4249 9215
TIME...MOT...LOC 1047Z 228DEG 45KT 4236 9255
WIND...HAIL <50MPH 1.00IN
$$
COGIL302
WWUS53 KDMX 201055
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
555 AM CDT SUN MAR 20 2011
IAC075-201105-
/O.CAN.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
GRUNDY IA-
555 AM CDT SUN MAR 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GRUNDY COUNTY IS
CANCELLED...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.
LAT...LON 4231 9249 4251 9256 4264 9239 4264 9234
4249 9215
TIME...MOT...LOC 1055Z 233DEG 47KT 4243 9243
$$
IAC013-201115-
/O.CON.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
BLACK HAWK IA-
555 AM CDT SUN MAR 20 2011
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BLACK HAWK
COUNTY UNTIL 615 AM CDT...
AT 553 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
STORM WAS LOCATED NEAR HUDSON...OR 8 MILES SOUTHWEST OF WATERLOO...
MOVING NORTHEAST AT 55 MPH.
LOCATIONS IMPACTED INCLUDE...
WATERLOO...CEDAR FALLS...EVANSDALE...WATERLOO AIRPORT...ELK RUN
HEIGHTS AND RAYMOND.
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 4231 9249 4251 9256 4264 9239 4264 9234
4249 9215
TIME...MOT...LOC 1055Z 233DEG 47KT 4243 9243
WIND...HAIL <50MPH 1.00IN
$$
COGIL659
WWUS53 KDMX 201112
SVSDMX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
612 AM CDT SUN MAR 20 2011
IAC013-201122-
/O.EXP.KDMX.SV.W.0002.000000T0000Z-110320T1115Z/
BLACK HAWK IA-
612 AM CDT SUN MAR 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR BLACK HAWK COUNTY WILL EXPIRE
AT 615 AM CDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM.
LAT...LON 4231 9249 4251 9256 4264 9239 4264 9234
4249 9215
TIME...MOT...LOC 1112Z 233DEG 36KT 4256 9226
$$
COGILThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 3:28 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll | 47 min |
| Mar 20, 11:11 AM CDT | River Flood Warning | DMX | Black Hawk | 8 days |
Nearby
Severe Thunderstorm Warnings in Iowa, 2011Every severe thunderstorm warning in 2011
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.