Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 3, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at May 10, 1999, 6:31 PM CDT for Anoka County, Hennepin County, Minnesota. It was in force for 29 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 10, 1999, 6:31 PM CDT (23:31 UTC)
- Expired
- May 10, 1999, 7:00 PM CDT
- In force
- 29 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
Counties Anoka County, MN, Hennepin County, MN
The radar
The Minneapolis radar (KMPX), 36 km from the middle of the area, began a volume at 23:13 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 10, 6:31 PM CDT | Thunderstorm Wind 58 | Crystal, MN | Numerous Large Trees felled. Auto and Home damaged. Fifteen thousand residents were leftwithout power for several hours. |
| May 10, 6:35 PM CDT | Thunderstorm Wind 56 | Brooklyn Park, MN | Trees Down. Wind Speed Estimated. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 37 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
- 1064 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 372 m²/s²
- 0-3 km storm-relative helicity
- 386 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KMSP 102334 RRA SVRMSP MNC003-053-110000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 631 PM CDT MON MAY 10 1999 THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... ANOKA COUNTY IN EAST CENTRAL MINNESOTA NORTHERN HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA * UNTIL 700 PM CDT * AT 631 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH DAMAGING WINDS OVER BROOKLYN CENTER...OR ABOUT 9 MILES NORTH OF MINNEAPOLIS...MOVING NORTH AT 50 MPH. * SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE... EAST BETHEL COON RAPIDS BROOKLYN PARK BLAINE CRYSTALL THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. THIS STORM HAS BLOWN DOWN TREES IN GOLDEN VALLEY AND CRYSTAL.
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 6:04 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi | 41 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1999Every severe thunderstorm warning in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.