Alert archive / Minnesota / Tornado Warnings in 2011
Tornado Warning 12, NWS Twin Cities, MN
NWS Twin Cities, MN issued this tornado warning at May 21, 2011, 6:37 PM CDT for Hennepin County, Isanti County, Minnesota. It was in force for 23 min. 4 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, 6:37 PM CDT (23:37 UTC)
- Expired
- May 21, 2011, 7:00 PM CDT
- In force
- 23 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
Counties Hennepin County, MN, Isanti County, MN
The radar
The Minneapolis radar (KMPX), 39 km from the middle of the area, began a volume at 23:40 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, 6:38 PM CDT | FUNNEL CLOUD | W Plymouth, MN | ROTATING WALL CLOUD |
| May 21, 6:51 PM CDT | HAIL 0.25 | Plymouth, MN | |
| May 21, 6:52 PM CDT | HAIL 0.25 | Plymouth, MN | |
| May 21, 6:55 PM CDT | FUNNEL CLOUD | Maple Grove, 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 12:00Z, 11.6 hours before the alert went out and 39 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
- 2 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 474 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 206 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
197
WFUS53 KMPX 212337
TORMPX
MNC053-059-220000-
/O.NEW.KMPX.TO.W.0012.110521T2337Z-110522T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
637 PM CDT SAT MAY 21 2011
THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A
* TORNADO WARNING FOR...
SOUTHWESTERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
NORTH CENTRAL HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
* UNTIL 700 PM CDT
* AT 636 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO NEAR
NEAR MEDINA... RADAR SHOWED THE TORNADIC STORM MOVING NORTH AT 20
MPH.
* LOCATIONS IN THE WARNING INCLUDE...
CORCORAN...
MAPLE GROVE...
OSSEO...
DAYTON...
ROGERS...
CHAMPLIN...
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.
&&
LAT...LON 4542 9320 4541 9350 4524 9350 4522 9344
4515 9334 4499 9348 4502 9366 4523 9359
4525 9351 4541 9350 4543 9352 4550 9350
TIME...MOT...LOC 2337Z 202DEG 17KT 4506 9354
$$
JLT2 follow-up statements
106
WWUS53 KMPX 212340
SVSMPX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
640 PM CDT SAT MAY 21 2011
MNC059-212355-
/O.CAN.KMPX.TO.W.0012.000000T0000Z-110522T0000Z/
ISANTI MN-
640 PM CDT SAT MAY 21 2011
...THE TORNADO WARNING FOR SOUTHWESTERN ISANTI COUNTY IS CANCELLED...
LAT...LON 4522 9344 4515 9334 4499 9348 4502 9366
4523 9359 4524 9352
TIME...MOT...LOC 2340Z 202DEG 17KT 4507 9353
$$
MNC053-220000-
/O.CON.KMPX.TO.W.0012.000000T0000Z-110522T0000Z/
HENNEPIN MN-
640 PM CDT SAT MAY 21 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL HENNEPIN
COUNTY UNTIL 700 PM CDT...
AT 636 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO. THIS
TORNADO WAS LOCATED NEAR MEDINA...MOVING NORTH AT 20 MPH.
LOCATIONS IMPACTED INCLUDE...
CORCORAN...MAPLE GROVE...OSSEO...DAYTON...ROGERS AND CHAMPLIN.
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.
&&
LAT...LON 4522 9344 4515 9334 4499 9348 4502 9366
4523 9359 4524 9352
TIME...MOT...LOC 2340Z 202DEG 17KT 4507 9353
$$
JLT164
WWUS53 KMPX 212351
SVSMPX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
651 PM CDT SAT MAY 21 2011
MNC053-220000-
/O.CON.KMPX.TO.W.0012.000000T0000Z-110522T0000Z/
HENNEPIN MN-
651 PM CDT SAT MAY 21 2011
...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL HENNEPIN
COUNTY UNTIL 700 PM CDT...
AT 645 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM
WAS LOCATED EAST OF HAMEL...MOVING NORTHEAST AT 15 MPH.
TRAINED SPOTTERS EARLIER REPORTED A BRIEF TOUCHDOWN NEAR MEDINA WITH
THIS STORM.
LOCATIONS IMPACTED INCLUDE...
MAPLE GROVE...OSSEO...CHAMPLIN...DAYTON AND ROGERS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.
&&
LAT...LON 4522 9344 4515 9334 4499 9348 4502 9366
4523 9359 4524 9352
TIME...MOT...LOC 2350Z 221DEG 13KT 4508 9349
$$
JLTThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 3:20 PM CDT | Special Weather Statement | MPX | Renville | 40 min |
| May 21, 3:57 PM CDT | Special Weather Statement | MPX | McLeod, Meeker, Wright | 63 min |
| May 21, 4:11 PM CDT | Severe Thunderstorm Warning | MPX | McLeod, Meeker, Renville, Sibley, Wright | 49 min |
| May 21, 4:39 PM CDT | Severe Thunderstorm Warning | MPX | McLeod, Meeker, Wright | 66 min |
| May 21, 5:11 PM CDT | Special Weather Statement | MPX | Chippewa, Swift | 49 min |
| May 21, 5:25 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Pope, Swift | 50 min |
| May 21, 5:35 PM CDT | Severe Thunderstorm Warning | MPX | Carver, McLeod, Wright | 55 min |
| May 21, 6:13 PM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Wright | 62 min |
| May 21, 6:54 PM CDT | Special Weather Statement | MPX | Anoka, Sherburne | 51 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.