Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 129, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 13, 1999, 11:11 PM CDT for Anoka County, Minnesota. It was in force for 34 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
- Jul 13, 1999, 11:11 PM CDT (04:11 UTC)
- Expired
- Jul 13, 1999, 11:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Anoka County, MN
The radar
The Minneapolis radar (KMPX), 53 km from the middle of the area, began a volume at 04:15 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 |
|---|---|---|---|
| Jul 13, 11:11 PM CDT | Hail 1 | Andover, MN | |
| Jul 13, 11:15 PM CDT | Hail 0.75 | Coon Rapids, MN |
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 00:00Z, 4.2 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
- 1643 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 1437 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMPX 140414 RRA SVRMSP MNC003-140445- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES-CHANHASSEN MN 1111 PM CDT TUE JUL 13 1999 THE NATIONAL WEATHER SERVICE IN TWIN CITIES-CHANHASSEN MN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... ANOKA COUNTY IN EAST CENTRAL MINNESOTA * UNTIL 1145 PM CDT * AT 1111 PM CDT SEVERE WEATHER SPOTTERS REPORTED A SEVERE THUNDERSTORM WITH LARGE HAIL 3 MILES SOUTHWEST OF ANDOVER...OR ABOUT 19 MILES NORTH OF MINNEAPOLIS...MOVING EAST AT 20 MPH. 1 INCH DIAMTER HAIL WAS ALSO REPORTED IN ANOKA * SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE... HAM LAKE ANDOVER BLAINE THIS IS A DANGEROUS STORM WITH LARGE HAIL...STAY INDOORS AWAY FROM WINDOWS. &
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Twin Cities, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 13, 8:45 PM CDT, 2 hours 26 minutes earlier.
Area forecast discussion, Jul 13, 8:45 PM CDT, 2 hours 26 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 845 PM CDT TUE JUL 13 1999 FORECAST CONCERNS ARE CONVECTION CHANCES TONIGHT. STORMS TO OUR NORTH DEVELOPED ALONG OLD BOUNDARY FROM LAST NIGHT AND ALONG INSTABILITY GRADIENT..ALTHOUGH NOT THAT STRONG. STORM HAVE BEEN WEAKENING WITH NOT REAL STRONG LOW LEVEL FLOW. STORMS IN ND COULD STILL RIDE SE INTO AREA LATE TONIGHT. 21Z RUB HAD CARRIED SOME 850 MB MOIST CONV FROM S MN UP INTO N MN OVERNIGHT BY 06Z. OF OTHER CONCERN IS PERSISTENT AREA OF MOIST CONV OVER PARTS OF SW MN AND SOME ISOLATED CELLS HAVE DEVELOPED IN FAR SW MN. THESE ARE CURRENTLY RIDING ESE AND WILL PROBABLY JUST PASS SOUTH OF OUR AREA. WILL HOWEVER..THROW IN A LIGHT CHANCE FOR PARTS OF SW DUE TO SIG MOIST CONV. 00Z SOUNDINGS FOR BOTH ABR AND MPX SHOW A BIT OF A CAP AND NOT A GREAT DEAL OF MOISTURE. MID LEVEL WINDS NOT REAL IMPRESSIVE EITHER. THINK MOST ACTIVITY WILL REMAIN WIDELY SCATTERED. .MSP...NONE RICHARDSON
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 9:05 PM CDT | Severe Thunderstorm Warning | MPX | Redwood | 25 min |
| Jul 13, 10:50 PM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Wright | 40 min |
| Jul 13, 11:32 PM CDT | Severe Thunderstorm Warning | MPX | Wright | 28 min |
| Jul 13, 11:37 PM CDT | Severe Thunderstorm Warning | MPX | Chisago | 23 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.