Alert archive / Minnesota / Tornado Warnings in 2011
Tornado Warning 14, NWS Twin Cities, MN
NWS Twin Cities, MN issued this tornado warning at May 21, 2011, 7:25 PM CDT for Anoka County, Minnesota. It was in force for 35 min. 3 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
- May 21, 2011, 7:25 PM CDT (00:25 UTC)
- Expired
- May 21, 2011, 8:00 PM CDT
- In force
- 35 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
County Anoka County, MN
The radar
The Minneapolis radar (KMPX), 54 km from the middle of the area, began a volume at 00:26 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 |
|---|---|---|---|
| May 21, 7:27 PM CDT | HAIL 0.25 | Anoka, MN | DIME SIZE |
| May 21, 7:47 PM CDT | FUNNEL CLOUD | East Bethel, MN | ROTATING WALL CLOUD |
| May 21, 7:48 PM CDT | FUNNEL CLOUD | Ham Lake, MN | ROTATING WALL CLOUD |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.4 hours before the alert went out and 55 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
- 1091 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 922 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 348 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 2.3
- Supercell composite
- 12.8
The text
As transmitted, in the capitals the NWS used until 2016.
577 WFUS53 KMPX 220025 TORMPX MNC003-220100- /O.NEW.KMPX.TO.W.0014.110522T0025Z-110522T0100Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 725 PM CDT SAT MAY 21 2011 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * TORNADO WARNING FOR... ANOKA COUNTY IN EAST CENTRAL MINNESOTA... * UNTIL 800 PM CDT * AT 723 PM CDT...RADAR WAS TRACKING A SEVERE STORM WITH STRONG ROTATION. THE MOST DANGEROUS PART OF THE STORM WAS 2 MILES NORTH OF COON RAPIDS...AND MOVING NORTH AT 20 MPH. IN ADDITION...TRAINED SPOTTERS AROUND THE ANDOVER HAVE BEEN OBSERVING A ROTATING WALL CLOUD...WHICH PRODUCED A BRIEF TORNADO NEAR MEDINA EARLIER TONIGHT. * LOCATIONS IN THE WARNING INCLUDE... ANDOVER... HAM LAKE... CEDAR... EAST BETHEL... PRECAUTIONARY/PREPAREDNESS ACTIONS... WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. && LAT...LON 4540 9334 4532 9302 4513 9326 4521 9341 TIME...MOT...LOC 0024Z 198DEG 17KT 4521 9330 $$ JLT
3 follow-up statements
361 WWUS53 KMPX 220035 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 735 PM CDT SAT MAY 21 2011 MNC003-220100- /O.CON.KMPX.TO.W.0014.000000T0000Z-110522T0100Z/ ANOKA MN- 735 PM CDT SAT MAY 21 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR ANOKA COUNTY UNTIL 800 PM CDT... AT 732 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR HAM LAKE...OR 14 MILES WEST OF FOREST LAKE...MOVING NORTHEAST AT 20 MPH. IN ADDITION...TRAINED SPOTTERS HAVE BEEN REPORTING UP TO QUARTER SIZE HAIL FROM THIS SEVERE STORM NEAR ANOKA...ANDOVER AND COON RAPIDS. LOCATIONS IMPACTED INCLUDE... CEDAR...HAM LAKE AND EAST BETHEL. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES. && LAT...LON 4540 9334 4532 9302 4513 9326 4521 9341 TIME...MOT...LOC 0034Z 216DEG 18KT 4525 9325 $$ JLT
872 WWUS53 KMPX 220048 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 748 PM CDT SAT MAY 21 2011 MNC003-220100- /O.CON.KMPX.TO.W.0014.000000T0000Z-110522T0100Z/ ANOKA MN- 748 PM CDT SAT MAY 21 2011 ...A TORNADO WARNING REMAINS IN EFFECT FOR ANOKA COUNTY UNTIL 800 PM CDT... AT 746 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A ROTATING WALL CLOUD NEAR HAM LAKE AND EAST BETHEL...OR 11 MILES WEST OF FOREST LAKE...MOVING NORTHEAST AT 20 MPH. LOCATIONS IMPACTED INCLUDE... EAST BETHEL. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN IN A LOW LYING AREA. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES. && LAT...LON 4540 9334 4532 9302 4513 9326 4521 9341 TIME...MOT...LOC 0047Z 216DEG 18KT 4530 9320 $$ JLT
748 WWUS53 KMPX 220059 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 759 PM CDT SAT MAY 21 2011 MNC003-220114- /O.EXP.KMPX.TO.W.0014.000000T0000Z-110522T0100Z/ ANOKA MN- 759 PM CDT SAT MAY 21 2011 ...THE TORNADO WARNING FOR ANOKA COUNTY WILL EXPIRE AT 800 PM CDT... THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED AREA...HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES. LAT...LON 4540 9334 4532 9302 4513 9326 4521 9341 TIME...MOT...LOC 0059Z 216DEG 18KT 4535 9315 $$
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:00 PM CDT | Tornado Warning | MPX | Anoka, Hennepin | 45 min |
| May 21, 7:24 PM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Wright | 51 min |
| May 21, 7:46 PM CDT | Special Weather Statement | MPX | Pope | 44 min |
| May 21, 8:00 PM CDT | Areal Flood Advisory | MPX | Anoka, Hennepin, Wright | 3 hr |
| May 21, 8:06 PM CDT | Severe Thunderstorm Warning | MPX | Martin | 39 min |
| May 21, 8:44 PM CDT | Severe Thunderstorm Warning | MPX | Martin | 61 min |
| May 21, 8:59 PM CDT | Special Weather Statement | MPX | Todd | 61 min |
| May 21, 9:11 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 64 min |
| May 21, 9:25 PM CDT | Severe Thunderstorm Warning | MPX | Watonwan | 50 min |
| May 21, 9:42 PM CDT | Severe Thunderstorm Warning | MPX | Redwood | 48 min |
| May 21, 10:12 PM CDT | Special Weather Statement | MPX | Yellow Medicine | 48 min |
| May 21, 10:26 PM CDT | Special Weather Statement | MPX | Redwood | 34 min |
| May 21, 10:43 PM CDT | Severe Thunderstorm Warning | MPX | Brown, Martin, Redwood, Watonwan | 62 min |
| May 21, 10:43 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Pope, Renville, Stevens, Swift | 47 min |
| May 22, 12:46 AM CDT | Special Weather Statement | MPX | Le Sueur, Rice, Steele, Waseca | 44 min |
| May 22, 10:57 AM CDT | Special Weather Statement | MPX | Dakota, Goodhue, Rice | 48 min |
| May 22, 11:02 AM CDT | Special Weather Statement | MPX | Anoka, Hennepin, Ramsey | 43 min |
| May 22, 12:38 PM CDT | Severe Thunderstorm Warning | MPX | Le Sueur, Rice, Steele, Waseca | 52 min |
| May 22, 12:53 PM CDT | Severe Thunderstorm Warning | MPX | Carver, Le Sueur, Scott | 52 min |
| May 22, 1:23 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Goodhue, Rice, Steele | 67 min |
| May 22, 1:35 PM CDT | Special Weather Statement | MPX | Hennepin | 40 min |
| May 22, 2:05 PM CDT | Severe Thunderstorm Warning | MPX | Goodhue | 40 min |
| May 22, 2:10 PM CDT | Tornado Warning | MPX | Anoka, Hennepin, Ramsey | 35 min |
| May 22, 2:24 PM CDT | Tornado Warning | MPX | Anoka, Hennepin, Ramsey | 36 min |
| May 22, 2:45 PM CDT | Tornado Warning | MPX | Anoka, Ramsey, Washington | 30 min |
| May 22, 3:10 PM CDT | Tornado Warning | MPX | Chisago, Washington | 35 min |
| May 22, 3:34 PM CDT | Tornado Warning | MPX | Chisago | 41 min |
Nearby
Tornado Warnings in Minnesota, 2011Every tornado warning in 2011Tornadoes 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.