Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 11, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 21, 2007, 11:31 AM CDT for Sherburne County, Minnesota. It was in force for 29 min. 2 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
- Apr 21, 2007, 11:31 AM CDT (16:31 UTC)
- Expired
- Apr 21, 2007, 12:00 PM CDT
- In force
- 29 min
- Issued by
- NWS Twin Cities, MN
- Area
- Counties, with a storm outline in the text
County Sherburne County, MN
The radar
The Minneapolis radar (KMPX), 61 km from the middle of the area, began a volume at 16:33 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 |
|---|---|---|---|
| Apr 21, 11:37 AM CDT | HAIL 0.75 | 8 W Elk River, MN | |
| Apr 21, 11:40 AM CDT | HAIL 0.88 | 6 W Elk River, MN |
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, 4.5 hours before the alert went out and 60 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
- 1697 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 341 m²/s²
- 0-3 km storm-relative helicity
- 335 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KMPX 211631 SVRMPX MNC141-211700- /O.NEW.KMPX.SV.W.0011.070421T1631Z-070421T1700Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1131 AM CDT SAT APR 21 2007 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SHERBURNE COUNTY IN CENTRAL MINNESOTA... * UNTIL NOON CDT * AT 1129 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM... CAPABLE OF PRODUCING LARGE HAIL. THIS STORM WAS LOCATED 10 MILES SOUTHWEST OF ZIMMERMAN...OR ABOUT 18 MILES SOUTH OF PRINCETON...AND MOVING NORTHEAST AT 35 MPH. * LOCATIONS IMPACTED INCLUDE... ZIMMERMAN... SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED. LAT...LON 4537 9387 4530 9364 4536 9353 4554 9353 $$ RJN
1 follow-up statement
000 WWUS53 KMPX 211655 SVSMPX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 1153 AM CDT SAT APR 21 2007 MNC141-211713- /O.EXP.KMPX.SV.W.0011.000000T0000Z-070421T1700Z/ SHERBURNE MN- 1153 AM CDT SAT APR 21 2007 ...THE SEVERE THUNDERSTORM WARNING FOR SHERBURNE COUNTY EXPIRES AT NOON CDT... SEVERE STORMS WILL HAVE MOVED OUT OF THE AREA BY NOON AND ADDITIONAL DEVELOPMENT IS NOT EXPECTED. AT 1146 AM...SPOTTERS REPORTED HAIL COVERING HIGHWAY 10 IN BIG LAKE TOWNSHIP. LAT...LON 4537 9387 4530 9364 4536 9353 4554 9353 $$ RJN
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 3:46 AM CDT | Wind Advisory | MPX | Blue Earth, Brown, Faribault, Freeborn, Martin, Redwood and 4 more | 16 hr |
| Apr 21, 6:12 AM CDT | Severe Thunderstorm Warning | MPX | Stearns | 40 min |
| Apr 21, 9:47 AM CDT | Severe Thunderstorm Warning | MPX | McLeod, Meeker, Renville, Sibley, Wright | 58 min |
| Apr 21, 11:57 AM CDT | Severe Thunderstorm Warning | MPX | Isanti | 33 min |
| Apr 21, 12:16 PM CDT | Severe Thunderstorm Warning | MPX | Chisago | 44 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2007Every severe thunderstorm warning in 2007
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.