Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 127, NWS Twin Cities, MN

July 13, 1999Redwood County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 13, 1999, 9:05 PM CDT for Redwood County, Minnesota. It was in force for 25 min. 1 report 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, 9:05 PM CDT (02:05 UTC)
Expired
Jul 13, 1999, 9:30 PM CDT
In force
25 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Redwood County, MN

The radar

The Minneapolis radar (KMPX), 142 km from the middle of the area, began a volume at 02:09 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

TimeReportWhereRemark
Jul 13, 9:10 PM CDTHail 0.88Walnut Grove, 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, 2.1 hours before the alert went out and 140 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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 1999-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1643 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1999-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMPX 140208 RRA
SVRMSP
MNC127-140230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES-CHANHASSEN MN
905 PM CDT TUE JUL 13 1999

THE NATIONAL WEATHER SERVICE IN TWIN CITIES-CHANHASSEN MN HAS ISSUED 
A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHERN REDWOOD COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 930 PM CDT

* AT 905 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL 8 MILES WEST OF WALNUT GROVE...
  OR ABOUT 17 MILES SOUTHEAST OF MARSHALL...MOVING EAST AT 45 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  WANDA
  WALNUT GROVE
  SANBORN
  REVERE
  LAMBERTON

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, 20 minutes earlier.

Area forecast discussion, Jul 13, 8:45 PM CDT, 20 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.

IssuedProductOfficeCountiesLasted
Jul 13, 10:50 PM CDTSevere Thunderstorm WarningMPXHennepin, Wright40 min
Jul 13, 11:11 PM CDTSevere Thunderstorm WarningMPXAnoka34 min
Jul 13, 11:32 PM CDTSevere Thunderstorm WarningMPXWright28 min
Jul 13, 11:37 PM CDTSevere Thunderstorm WarningMPXChisago23 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.